ML25345A157

Ghd Services, Inc., Hydrogeologic Investigation Report-Addendum, December 4, 2025

ML25345A157
Person / Time
Site:	Oyster Creek
Issue date:	12/11/2025
From:	GHD Services, Holtec Decommissioning International
To:	Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
Shared Package
ML25345A092	List: ML25345A093 ML25345A095 ML25345A096 ML25345A097 ML25345A098 ML25345A109 ML25345A110 ML25345A111 ML25345A112 ML25345A113 ML25345A114 ML25345A115 ML25345A116 ML25345A117 ML25345A118 ML25345A119 ML25345A124 ML25345A125 ML25345A126 ML25345A127 ML25345A128 ML25345A129 ML25345A130 ML25345A131 ML25345A132 ML25345A133 ML25345A136 ML25345A137 ML25345A138 ML25345A139 ML25345A140 ML25345A141 ML25345A142 ML25345A143 ML25345A144 ML25345A145 ML25345A149 ML25345A150 ML25345A151 ML25345A152 ML25345A153 ... further results
References
HDI 25-039
Download: ML25345A157 (0)

Text

Hydrogeologic Investigation Report-Addendum Oyster Creek Generating Station Forked River, New Jersey Holtec Decommissioning International 4 December 2025 The Power of Commitment

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum i

Contents

1.

Introduction 1

2.

Station Description 1

2.1 Station Location 1

2.2 Station Setting 2

2.2.1 Topography and Surface Water Features 2

2.3 Area Groundwater Use 2

2.4 Off-Site Water Well Inventory 3

3.

Groundwater Flow Monitoring Update 4

3.1 Results Summary 4

3.1.1 Groundwater Flow Directions 4

4.

Radiological History 5

5.

ResRad Inputs Evaluation 5

6.

Conclusions 6

Figure Index Figure 1.1 Site Location Map Figure 1.2 Site Aerial - Parcel 1 Figure 1.3 Site Aerial - Parcel 2 Figure 2.1 Potentially Potable Well Locations Figure 3.1 Potentiometric Surface Contours (Cape May Formation) - April 2022 Figure 3.2 Potentiometric Surface Contours (Cape May Formation) - October 2022 Figure 3.3 Potentiometric Surface Contours (Cape May Formation) - April 2023 Figure 3.4 Potentiometric Surface Contours (Cape May Formation) - October 2023 Figure 3.5 Potentiometric Surface Contours (Cape May Formation) - April 2024 Figure 3.6 Potentiometric Surface Contours (Cape May Formation) - October 2024 Figure 3.7 Potentiometric Surface Contours (Cape May Formation) - April 2025 Figure 3.8 Potentiometric Surface Contours (Cohansey Formation) - April 2022 Figure 3.9 Potentiometric Surface Contours (Cohansey Formation) - October 2022 Figure 3.10 Potentiometric Surface Contours (Cohansey Formation) - April 2023 Figure 3.11 Potentiometric Surface Contours (Cohansey Formation) - October 2023 Figure 3.12 Potentiometric Surface Contours (Cohansey Formation) - April 2024 Figure 3.13 Potentiometric Surface Contours (Cohansey Formation) - October 2024 Figure 3.14 Potentiometric Surface Contours (Cohansey Formation) - April 2025 Figure 3.15 Conceptual Site Model Figure 4.1 Historic Radiological Event Locations

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum ii Table Index Table 4.1 Evaluation of Monitoring Well and 50.75g Locations Table 5.1 Model and Site Hydrogeologic Parameters

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 1

1.

Introduction GHD Services Inc. (GHD) on behalf of Holtec Decommissioning International (Holtec), has prepared this addendum to the Hydrogeologic Investigation Report (HIR) as part of the continued and ongoing effort to identify and report groundwater conditions within the boundaries of the plant at the Oyster Creek Generating Station (Station) in Forked River, New Jersey (see Figure 1.1). The Station is defined as all property, structures, systems, and components owned and operated by Holtec located on US Route 9 South in Forked River, New Jersey. The approximate property boundaries are depicted on Figure 1.1. High resolution satellite aerial images of Parcel 1 (Licensed Site) and Parcel 2 (Additionally Owned Property) are depicted on Figures 1.2 and 1.3, respectively.

This HIR addendum was prepared to be used for the License Termination Plan (LTP).This report was reviewed by Station personnel and the Station informed GHD that there have not been any significant changes at the Station since this report. GHD used the information supplied by Holtec to prepare this HIR.

2.

Station Description The following section presents a summary of the Station location and definition, overview of Station operations, surrounding land use, and an overview of regional and Station specific topography, surface water features, geology, hydrogeology, and groundwater flow conditions. An overview of the groundwater use in the area is also presented.

2.1 Station Location The Site is located at 741 US Route 9 in Lacey and Ocean Townships, Ocean County, New Jersey and is located to the west of US Route 9. For the purposes of the PA, the Site is addressed as two distinct areas: Oyster Creek Nuclear Generating Station (OCNGS) and former Finninger Farm Property.

OCNGS (the Licensed Site)

The OCNGS is situated on two tax parcels. The nuclear power generating activities were confined to the 139.6-acre parcel (Block 1001, Lot 4.02) bounded by US Route 9 to the east and the intake canal to the north, west, and south.

The second lot is a 12.01-acre undeveloped parcel located in Ocean Township (Block 41, Lot 43).

The nuclear power generating facility and associated structures were constructed between December 1963 and December 1969. The remainder of the Site consists of the South Branch of the Forked River, a portion of which was enhanced and modified for use as non-contact cooling water intake and discharge canals for the plant, and wooded, vegetated, and marsh land.

Former Finninger Farm (Additionally Owned Property)

The former Finninger Farm Property consists of approximately 626 acres located to the east of Route 9. This area is primarily vegetated and undeveloped. The Intake Canal flows from Barnegat Bay along the northern portion of former Finninger Farm Property, and the Discharge Canal flows from the Station to Barnegat Bay along the southern portion of former Finninger Farm Property. The South Branch of Forked River runs across the northern side of the Station and Oyster Creek partly borders the southern side. In 2018, the New Jersey Department of Transportation (NJDOT) purchased the dredged spoil area, which was previously contained within Former Finninger Farm Property and occupied approximately 17 acres. The area housed about 180,000 cubic yards of riverbed dredged from the Forked River and Oyster Creek in 1978, 1984, and 1997 and was then expanded to approximately 40-acres upon NJDOT ownership in 2018.

The Site is shown on Figure 1.3.

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 2 2.2 Station Setting The following sections present a summary of the topography, surface water features, geology, hydrogeology, and groundwater flow conditions in the region surrounding the Station. The information was primarily gathered from Sections 2.1 and 2.5 of the Oyster Creek Updated Final Safety Analysis Report (UFSAR) Revision 16, dated October 2009.

2.2.1 Topography and Surface Water Features The Site lies within the Coastal Plain Physiographic Province. According to the New Jersey Geologic Survey the Coastal Plain Physiographic Province is generally a seaward-dipping wedge of Cretaceous and Tertiary sediments sloping gently to the southeast from 10 to 60 feet per mile.

The topography of the Site is generally flat with elevations ranging from approximately 10 to 23 feet above mean sea level.

Land surface elevation near the center of the Site is approximately 18 feet relative to NAVD 1988. Based on observations during the Site reconnaissance, the Site is relatively flat with a slight decline to the north and south towards the South Branch of the Forked River or Oyster Creek, depending on location within the Site. There is also an overall slight decline in elevation to the east towards Barnegat Bay.

The South Branch of the Forked River and Oyster Creek both flow generally eastward where they join Barnegat Bay.

Non-contact cooling water intake and discharge canals are also located near the Sites center and draw water from the South Branch of the Forked River and discharge to Oyster Creek.

The nearest surface water bodies to the Site include the South Branch of the Forked River (north of the Forked River Easements) and Oyster Creek (south of the Forked River Easements). In addition, man-made intake and discharge canals, designed to provide non-contact cooling water to the OCNGS, are located along the north, west, and south sides of the OCNGS and connect the South Branch of the Forked River with Oyster Creek.

2.3 Area Groundwater Use On-Site Groundwater Use The Station's potable water supply was connected to the Lacey Municipal Utilities Authority (LMUA) in 2024. Prior to this the Stations potable water was formerly supplied by the North Domestic Water Well (PWSID #1512386);

however, the PWSID was retired and this well was re-permitted as an industrial supply well. The South Domestic Water Well was abandoned in 2024. The 145-foot-deep north well was installed in 1987 and withdraws water from the Kirkwood Formation.

Off-Site Groundwater Use Water supply wells are present, at and near, the Station. An estimated 83 percent of the population of Ocean County, New Jersey is served by public water supply. Based on volume, groundwater withdrawals accounted for approximately 87 percent of the public water supply (USGS, 2004).

Since the early 1990s, the source of water for indoor use and domestic use by area residents has been transitioned from private to public supply sources (URS GWC, 2000). Within a 5-mile radius of the Station, water supply wells typically are 60 feet or more in depth, penetrate at least one clay unit to preclude saltwater intrusion or leachate infiltration from septic fields, where present, and yield water from unconsolidated deposit aquifers, typically the Cohansey or Kirkwood Formations (WCC, 1984).

Three drinking water wells near the Station are routinely sampled for radionuclides as part of the Stations REMP. A list of the wells and location descriptions are provided below (TBEES, 2009):

Ocean Township Municipal Utility Authority Well located 1.6 miles south from the Station. The reported depth is approximately 360 feet.

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 3 Two Lacey Township Municipal Utilities Authority (LMUA) Wells - located 2.2 and 3.5 miles north from the Station.

The reported depths are greater than 200 feet.

There are also three irrigation wells that are east of U.S. Route 9. These wells are located in Lacey Townships Clune Park approximately 1.2 miles east of the Station, in the southwestern corner of the Forked River Beach development The wells are completed in the Cohansey Formation and have depths ranging from 65 to 125 feet bgs. By Lacey Township municipal ordinance these wells cannot serve as a drinking water source and are used for irrigation or other outdoor, non-potable uses.

JCP&L There are eight water supply wells on the JCP&L property located west of the Station. These eight wells supply water for fire protection (four wells), process water for the combustion turbine system (2 wells) and domestic water supply (2 wells). One of the fire protection wells (DW-2) and one of the process water supply wells (JCP&L-2) are installed in the Cohansey Formation, while five other wells are installed in the Kirkwood Formation. It is likely that the remaining fire protection well (SW-1) is also installed in the Kirkwood Formation, though it has not confirmed.

As part of the investigation of non-radiological impacts at the firing range located on the JCP&L property, 11 monitoring wells were installed in and around the range. Non-radiological groundwater impacts were identified in one of these monitoring wells. The groundwater impact is completely delineated and will be addressed through an institutional control implemented by JCP&L.

2.4 Off-Site Water Well Inventory An initial water well inventory was completed during the 2006 HIR. The water well inventory was updated in 2010, 2016 and 2022 as part of the on-going RIW activities. The following presents a summary of the 2010, 2016 and 2022 off-Site water well inventories.

NJDEP 1-mile, 2-mile and 5-mile Radius Water Well Searches Previous well searches were completed for the site beginning in April 2010, which included a 2-mile manual radius well search for private, public, and industrial supply and monitoring wells and a 5-mile pumping/diversion well search.

The initial well search yielded approximately 2,000 domestic industrial, and public supply well records existed based on the data provided by NJDEP in 2010. Since the records did not contain accurate locational information, it was not possible to confirm that all of these wells were located within 2 miles of the site. The follow up one-mile well search in 2016 yielded records for two wells installed within 1 mile of the site after June 2010.

In March 2022, GHD performed an additional water well search on the NJDEP Water Well database, using the same search criteria used previously in the July 2016 search. The search yielded 4 additional wells since the July 2016 water well search was completed, all for irrigation use.

Additionally, there are currently Lacey (§329-2) and Ocean Township (§400-3) ordinances requiring connection to the public water supply when a water pipeline is available in the public street adjoining the property. A public water main exists within South Main Street (State Route 9) which adjoins the OCNGS.

The potentially potable well location figure included in the previous HIR did not depict the water line. An updated potentially potable well location figure is included as Figure 2.1.

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 4

3.

Groundwater Flow Monitoring Update Field activities evaluated for this HIR Addendum were completed as part of the ongoing RGPP and groundwater investigations. A Station vendor, Normandeau Associates (Normandeau), have routinely collected groundwater elevation measurements. For this addendum, groundwater elevation data collected between April 2022 and April 2025 (7 rounds) was evaluated).

3.1 Results Summary This section presents a summary of the Station hydrogeology, updated for the period from April 2022 to April 2025.

This updated review was also completed to confirm groundwater flows are remaining consistent since the shutdown and to further evaluate the potential for flow to the east in the Cape May and Cohansey formations.

The water table aquifer extends from approximately 5 to 20 feet bgs beneath the Station property in the monitoring wells gauged during this period. This unconfined aquifer comprises the Cape May Formation and the underlying Cohansey Formation which is local confined by the 5-to 10-foot thick upper clay. The upper clay layer separating these formations was breached during construction connecting the two permeable formations in the area of the Intake/Discharge Canal and the Turbine Generator and Reactor Buildings.

Figures 3.1 through 3.14 present groundwater elevation contours based on water level data collected for the Cape May and Cohansey Formations.

3.1.1 Groundwater Flow Directions Cape May Formation Figures 3.1 and 3.7 present groundwater contours in the Cape May Formation. Convergent flow to the west, north, and south away from the eastern central portion of the licensed portion of the Station property toward the Intake and Discharge Canals which is consistent with pre-shutdown and post-shutdown conditions. These contours indicate that, within the footprint of the Station, the Intake and Discharge Canals are the primary discharge areas within the footprint of the Station. The Intake and Discharge Canals are Cape May Formation groundwater discharge areas.

Based on these rounds of monitoring, the shutdown of the Station has not significantly impacted either the groundwater elevations flow direction in the Cape May Formation.

Cohansey Formation Figure 3.8 through 3.14 presents groundwater contours for the wells installed the Cohansey Formation. The groundwater flow direction is divergent (radial flow) from a hydraulic high in the central plant area (just south of the Reactor Building) to the north, west, and south is towards the canals. This pattern reflects a small groundwater mound caused by partial removal of an intervening clay layer during original facility construction. This is consistent with pre-shutdown and historical post-shutdown conditions. These flow patterns indicate that, within the footprint of the Station, the primary groundwater discharge area is Intake and Discharge Canals, which are receiving groundwater from the Cohansey Formation.

Based on a review of historical groundwater elevations within the Cohansey Formation, groundwater flow patterns have remained stable over time. The expected radial flow away from the mound toward the canal is evident, with only a minor eastward component observed in the power block area of the site. To evaluate whether historical groundwater elevations could reliably predict current flow conditions, GHD reviewed long-term water-level data trends in selected wells (W-10, W-66I, W-68I, and W-14). Results show variability without a consistent trend, confirming long term stability in flow direction and gradients. Under this assumption, east-northeast flow within the Cohansey Formation as depicted on the July 2016 groundwater contour map found in the 2022 HIR is limited to the power block area and still ultimately flows to the canal.

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 5 Potential eastward migration of the tritium plume was also assessed. Tritium results demonstrate confinement of the former plume to the western site area near the Reactor and Turbine Buildings, with non-detect results in eastern wells (LW-4 and W-3A). These findings indicate that tritium migration eastward with groundwater flow is not occurring; instead, the plume remains confined to the western portion of the site near the generator and reactor buildings.

The current Cohansey Formation monitoring network therefore provides sufficient monitoring coverage for ongoing groundwater flow and quality assessment. As a conservative measure, ground water monitoring wells L-4 and W-4B will be incorporated into the RGPP monitoring program since future intrusive decommissioning activities may create the potential to change subsurface conditions or mobilize potential residual ROCs.

The Conceptual Site Model is depicted on Figure 3.15

4.

Radiological History The historical radiological events identified in the 50.75g records were assessed to confirm they are adequately characterized using the existing monitoring well network in the Cape May and Cohansey Formations. Monitoring wells were found to be located at or downgradient of each of the 50.75g locations, with the exception of five locations identified as baseline soil sampling locations which were not indicative of radiological impacts. Based on this assessment, the existing monitoring well network adequately characterizes the site.

A detailed summary, including identification of the monitoring well location at or downgradient of these areas is included in Table 4.1. The 50.75g locations are included on Figure 4.1.

5.

ResRad Inputs Evaluation A comparison table of the RESRAD model and site-specific parameters gathered from the 2022 Hydrogeologic Investigation Report (HIR) is presented in Table 5.1. The table was prepared to compare the RESRAD Hydrogeologic Inputs used by BHI (as described in the Basement Fill Modet Report dated March 6, 2024) to any possible site-specific hydrogeologic information. It is assumed that the Contaminated Zone (CZ) details (area, thickness, etc.) used in the RESRAD model are correct and have a basis in the radiological investigation work completed by BHI.

In most cases when there was a site-specific parameter available, the value or a very comparable value was used in the RESRAD model input. GHD did note a few parameters where the RESRAD inputs could be updated. It appears that the depth to water used to determine the contaminated fraction below the water table were based on data from 2016. The alternate value GHD provided was based on the average depth to water data from 2021/2022. This slightly increased the fraction of the CZ below the water table from 0.7326 to 0.7635, increased the saturated zone thickness to 10.01 meters and decreased the unsaturated zone thickness to 3.1.

For both the contaminated zone and the saturated zone the hydraulic conductivity and hydraulic gradients used in the RESRAD model were from the Cape May Aquifer; however, the contaminated zone crosses the Cape May and Cohansey formations with a large portion within the Cohansey. GHD provided the Cohansey hydraulic conductivity and hydraulic gradients as options; however, the use of the hydraulic conductivity and hydraulic gradients of the Cape May are most conservative.

Finally, GHD noted the inputs for an unsaturated zone were provided; however, based on the conceptual site model in RESRAD, the unsaturated zone is considered a clean zone between the radiological contamination and the water table. The site-specific conceptual model, as depicted on figure 6-1 from the Basement Fill Model Report, shows the contaminated zone from immediately below the cover down to a depth below the water table.

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 6

6.

Conclusions Based on the information provided in this HIR addendum, GHD concludes:

Groundwater Flow Groundwater flow in the Cape May and Cohansey Formations is affected by the construction of the Reactor Building, the Turbine Building, the Intake/Discharge Tunnels and the Intake and Discharge Canals.

Groundwater in the Cape May Formation flows towards and discharges into the Intake and Discharge Canals.

Groundwater in the Cohansey Formation flows radially outward from the center of the plant. Groundwater in the shallow Cohansey, within the licensed portion of the Station, discharges to the Intake and Discharge Canals.

Historical Radiological Release The existing monitoring well networks adequately characterizes the historical radiological release areas on the site.

ResRad Parameters The inputs in the ResRad model were based on site-specific data when possible and the inputs were conservative in nature. Additionally, the evaluation of the groundwater flow confirming no significant flow to the east confirming the groundwater is discharging to the canal. These hydraulic gradients have remained consistent based on a review of the additional post shutdown groundwater elevation data presented on the groundwater contour maps in this report.

Applicable references are identified in the September 2022 HIR.

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 7 Figures

FIRE POND SITE PARCEL 1 PARCEL 2 Date Project No.

Filename: N:\\US\\Edison\\Projects\\564\\11197486\\Digital_Design\\ACAD\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D101_WA-001.DWG Plot Date: 19 November 2025 1:12 PM 11197486-12 November 2025 FIGURE 1.1 HOLTEC DECOMMISSIONING INTERNATIONAL OYSTER CREEK GENERATING STATION FORKED RIVER, NEW JERSEY SITE LOCATION MAP Source: U.S.G.S Quadrangle Map: Otster Creek Mosaic New Jersey, 2001 0

4000ft 2000 N

LEGEND PARCEL 1 - LICENSED SITE PARCEL 2 - ADDITIONALLY OWNED PROPERTY

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS Date Project No.

Filename: N:\\US\\Edison\\Projects\\564\\11197486\\Digital_Design\\ACAD\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D119_WA-001.dwg Plot Date: 05 May 2022 3:24 PM 11197486 May 2022 FIGURE 1.2 HOLTEC DECOMMISSIONING INTERNATIONAL OYSTER CREEK GENERATING STATION FORKED RIVER, NEW JERSEY SITE AERIAL - PARCEL 1 Coordinate System:

STATE PLANE -

NAD83 NJ (FEET) 0 100 200 ft 2

0 0.

0 0

0 1" = 200 ft N

LEGEND APPROXIMATE SITE BOUNDARY

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS

© 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS Date Project No.

Filename: N:\\US\\Edison\\Projects\\564\\11197486\\Digital_Design\\ACAD\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D118_WA-001.dwg Plot Date: 19 November 2025 1:39 PM 11197486 November 2025 FIGURE 1.3 HOLTEC DECOMMISSIONING INTERNATIONAL OYSTER CREEK GENERATING STATION FORKED RIVER, NEW JERSEY SITE AERIAL - PARCEL 2 Coordinate System:

STATE PLANE -

NAD83 NJ (FEET) 0 400 800 ft 8

0 0.

0 0

0 1" = 800 ft N

LEGEND PARCEL 1 - LICENSED SITE PARCEL 2 - ADDITIONALLY OWNED PROPERTY

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Revision No.

11197486 Date Nov 19, 2025 HOLTEC DECOMMISSIONING INTERNATIONAL HYDROGEOLOGIC INVESTIGATION REPORT OYSTER CREEK NUCLEAR GENERATING STATION 741 S MAIN ST, FORKED RIVER, NJ 08731 Map Projection: Transverse Mercator Horizontal Datum: North American 1983 Grid: NAD 1983 StatePlane New Jersey FIPS 2900 Feet Paper Size ANSI B o Data source: Google Earth Satellite, Imagery Date 4/5/2021; Water Well Source - NJDEP DataMiner Q:\\GIS\\PROJECTS\\11197000s\\11197486\\Layouts\\202203_PRES001\\11197486_202203_PRES001_GIS003.mxd Legend

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Oyster Creek Nuclear Generating Station LMUA potable water service line 1-Mile Radius from NMP Plant Location Well Use

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WATER WELLS Note

1) ** these are on OCNGS (Block 1001, Lot 4.02 Fire protection 1 and water supply 1)

2) Lacey Ordinance § 329-2 (including Ocean Township - Ordinance § 400-3) -

Connections to available waterlines required; A. The owner of any building adjoining any public street in the Township of Lacey in which a water pipeline is now or may hereafter be constructed shall connect such building and all water facilities therein to said waterline

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

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C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLAND ELEVATION NOT AVAILABLE (TYP.)

4.0 4.0 6.0 6.0 8.0 8.0 10.0 10.0 2.0 0.5 0.5 2.0 2.0 4.0 4.0 6.0 6.0 8.0 8.0 10.0 10.0 CST-6 CST-9 W-20 W-23 W-28 W-29 W-30 W-31 SW-2B SW-2A SOUTH BRIDGE SW-3 1500 FT TO EAST NORTH BRIDGE SW-4 1600 FT TO NE MW-16D (4.33)

MW-15K-1A (4.51)

MW-1A-2A (8.33)

MW-1I-1A (10.01)

MW-1I-2A (9.51)

W-3 (2.99)

W-5 (8.96)

W-9 (5.67)

W-12 (9.10)

W-15 (10.40)

W-24 (6.96)

W-52 (2.27)

W-53 (4.18)

W-54 (1.63)

W-55 (2.39)

W-62 (7.60)

W-64 (1.91)

W-65 (2.30)

W-67 (2.84)

W-71 (4.65)

W-72 (3.80)

W-1B (NM)

CST-2 (NM)

LW-1 (NM)

LW-2 (NM)

LW-3 (NM)

MW-1G-6A (NM)

MW-1G-2A (NM)

MW-1G-1A (NM)

W-51 (NM)

W-50 (NM)

W-22 (NM)

W-19 (NM)

W-27 (NM)

W-18 (NM)

W-25 (NM)

W-26 (NM)

W-2B (NM)

W-3B (NM)

W-4B (NM)

W-7 (NM)

W-21 W-32 W-33 SW-5A SW-1A 12.0 12.0 W-16 (12.45) 12.0 12.0 LEGEND APPROXIMATE PROPERTY BOUNDARY CAPE MAY/FILL FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

2.

MINOR CONTOUR INACCURACIES NEAR THE BUILDINGS RESULT FROM THE GRID RESOLUTION OF THE SOURCE FILE AND SIGNIFICANT CHANGES IN GROUNDWATER ELEVATIONS OVER SHORT DISTANCES. THE CONTOURS WERE ADJUSTED TO INCLUDE AS MUCH DATA AS FEASIBLE WHILE AVOIDING CLUTTER IN AN ALREADY BUSY AREA OF THE FIGURE.

EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED CAPE MAY/FILL FORMATION MONITORING W-20 WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 5 December 2025 - 2:09 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D125_WA-001.DWG Date Drafting Check Project Manager Project No.

Title Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

50 100 ft 100.000000 0.01 POTENTIOMETRIC SURFACE FIGURE 3.1 CONTOURS CAPE MAY FORMATION - APRIL 2022 HOLTEC DECOMMISSIONING INTERNATIONAL Project BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 (8.05)

(NM)

ELEVATION AS SHOWN

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RIPRAP FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER GRATE PARKING ABANDONED RAILROAD ABANDONED RAILROAD PARKING SUBSTATION 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLAND ELEVATION NOT AVAILABLE (TYP.)

CST-6 CST-9 W-20 W-23 W-28 W-29 W-30 W-31 SW-2B SW-2A SW-1A SOUTH BRIDGE SW-3 1500 FT TO EAST NORTH BRIDGE SW-4 1600 FT TO NE MW-16D (5.01)

MW-15K-1A (5.22)

MW-1A-2A (8.83)

MW-1I-1A (10.58)

MW-1I-2A (10.16)

W-3 (4.26)

W-9 (6.91)

W-12 (8.86)

W-15 (10.36)

W-24 (8.51)

W-52 (2.49)

W-53 (4.71)

W-54 (1.89)

W-55 (2.87)

W-64 (2.44)

W-67 (3.40)

W-71 (5.62)

W-72 (4.30)

W-1B (NM)

CST-2 (NM)

LW-1 (NM)

LW-2 (NM)

LW-3 (NM)

MW-1G-6A (NM)

MW-1G-2A (NM)

MW-1G-1A (NM)

W-51 (NM)

W-50 (NM)

W-22 (NM)

W-19 (NM)

W-27 (NM)

W-18 (NM)

W-25 (NM)

W-26 (NM)

W-2B (NM)

W-3B (NM)

W-4B (NM)

W-7 (NM)

W-21 W-32 W-33 SW-5A 0.5 0.5 2.0 4.0 6.0 8.0 8.0 10.0 10.0 6.0 4.0 2.0 2.0 4.0 6.0 8.0 10.0 10.0 8.0 6.0 4.0 2.0 12.0 12.0 W-5 (9.51)

W-62 (8.02)

W-65 (3.19)

W-16 (12.62) 12.0 12.0 LEGEND APPROXIMATE PROPERTY BOUNDARY CAPE MAY/FILL FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED CAPE MAY/FILL FORMATION MONITORING W-20 WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 5 December 2025 - 2:09 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D126_WA-001.DWG Date Drafting Check Project Manager Project No.

Title Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

50 100 ft 100.000000 0.01 POTENTIOMETRIC SURFACE FIGURE 3.2 CONTOURS CAPE MAY FORMATION - OCTOBER 2022 HOLTEC DECOMMISSIONING INTERNATIONAL Project BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 (8.05)

(NM)

ELEVATION AS SHOWN NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

2.

MINOR CONTOUR INACCURACIES NEAR THE BUILDINGS RESULT FROM THE GRID RESOLUTION OF THE SOURCE FILE AND SIGNIFICANT CHANGES IN GROUNDWATER ELEVATIONS OVER SHORT DISTANCES. THE CONTOURS WERE ADJUSTED TO INCLUDE AS MUCH DATA AS FEASIBLE WHILE AVOIDING CLUTTER IN AN ALREADY BUSY AREA OF THE FIGURE.

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RIPRAP FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER GRATE PARKING ABANDONED RAILROAD ABANDONED RAILROAD PARKING SUBSTATION 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 2.0 4.0 6.0 8.0 8.0 10.0 10.0 6.0 4.0 2.0 2.0 4.0 6.0 8.0 10.0 10.0 8.0 6.0 4.0 2.0 CST-6 CST-9 W-20 W-23 W-28 W-29 W-30 W-31 SW-2B SW-2A SW-1A SOUTH BRIDGE SW-3 1500 FT TO EAST NORTH BRIDGE SW-4 1600 FT TO NE MW-15K-1A (3.82)

MW-1A-2A (8.60)

MW-1I-1A (9.97)

MW-1I-2A (9.49)

W-3 (3.24)

W-5 (8.78)

W-9 (5.59)

W-15 (9.76)

W-24 (6.46)

W-52 (2.28)

W-53 (3.58)

W-54 (1.32)

W-55 (2.44)

W-62 (7.17)

W-64 (2.04)

W-67 (3.15)

W-71 (4.83)

W-72 (4.01)

W-1B (NM)

CST-2 (NM)

LW-1 (NM)

LW-2 (NM)

LW-3 (NM)

MW-1G-6A (NM)

MW-1G-2A (NM)

MW-1G-1A (NM)

W-51 (NM)

W-50 (NM)

W-22 (NM)

W-19 (NM)

W-27 (NM)

W-18 (NM)

W-25 (NM)

W-26 (NM)

W-2B (NM)

W-3B (NM)

W-4B (NM)

W-7 (NM)

W-21 W-32 W-33 SW-5A MW-16D (4.65)

W-12 (8.42)

W-65 (2.42)

W-16 (12.39) 12.0 12.0 12.0 12.0 LEGEND APPROXIMATE PROPERTY BOUNDARY CAPE MAY/FILL FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED CAPE MAY/FILL FORMATION MONITORING W-20 WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 5 December 2025 - 2:10 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D127_WA-001.DWG Date Drafting Check Project Manager Project No.

Title Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

50 100 ft 100.000000 0.01 POTENTIOMETRIC SURFACE FIGURE 3.3 CONTOURS CAPE MAY FORMATION - APRIL 2023 HOLTEC DECOMMISSIONING INTERNATIONAL Project BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 (8.05)

(NM)

ELEVATION AS SHOWN NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

2.

MINOR CONTOUR INACCURACIES NEAR THE BUILDINGS RESULT FROM THE GRID RESOLUTION OF THE SOURCE FILE AND SIGNIFICANT CHANGES IN GROUNDWATER ELEVATIONS OVER SHORT DISTANCES. THE CONTOURS WERE ADJUSTED TO INCLUDE AS MUCH DATA AS FEASIBLE WHILE AVOIDING CLUTTER IN AN ALREADY BUSY AREA OF THE FIGURE.

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RIPRAP FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER GRATE PARKING ABANDONED RAILROAD ABANDONED RAILROAD PARKING SUBSTATION 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 2.0 4.0 6.0 8.0 8.0 10.0 10.0 6.0 4.0 2.0 2.0 4.0 6.0 8.0 10.0 10.0 8.0 6.0 4.0 2.0 CST-9 W-20 W-23 W-28 W-29 W-30 W-31 SW-2B SW-2A SW-1A SOUTH BRIDGE SW-3 1500 FT TO EAST NORTH BRIDGE SW-4 1600 FT TO NE W-21 W-32 W-33 SW-5A MW-16D (5.04)

MW-15K-1A (4.93)

MW-1A-2A (8.20)

W-3 (4.91)

W-5 (9.18)

W-9 (6.00)

W-12 (8.42)

W-15 (9.64)

W-16 (11.57)

W-24 (7.08)

W-53 (4.41)

W-54 (2.08)

W-55 (3.13)

W-62 (5.76)

W-64 (2.78)

W-71 (5.31)

W-72 (4.37)

W-1B (NM)

CST-2 (NM)

LW-1 (NM)

LW-2 (NM)

LW-3 (NM)

MW-1G-6A (NM)

MW-1G-2A (NM)

MW-1G-1A (NM)

W-22 (NM)

W-19 (NM)

W-27 (NM)

W-18 (NM)

W-25 (NM)

W-26 (NM)

W-2B (NM)

W-3B (NM)

W-4B (NM)

W-7 (NM)

W-52 (3.08)

W-65 (3.40)

W-51 (NM)

W-50 (NM)

CST-6 W-67 (3.57) 10.0 MW-1I-1A (10.14)

MW-1I-2A (9.72)

LEGEND APPROXIMATE PROPERTY BOUNDARY CAPE MAY/FILL FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED CAPE MAY/FILL FORMATION MONITORING W-20 WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 5 December 2025 - 2:10 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D128_WA-001.DWG Date Drafting Check Project Manager Project No.

Title Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

50 100 ft 100.000000 0.01 POTENTIOMETRIC SURFACE FIGURE 3.4 CONTOURS CAPE MAY FORMATION - OCTOBER 2023 HOLTEC DECOMMISSIONING INTERNATIONAL Project BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 (8.05)

(NM)

ELEVATION AS SHOWN NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

2.

MINOR CONTOUR INACCURACIES NEAR THE BUILDINGS RESULT FROM THE GRID RESOLUTION OF THE SOURCE FILE AND SIGNIFICANT CHANGES IN GROUNDWATER ELEVATIONS OVER SHORT DISTANCES. THE CONTOURS WERE ADJUSTED TO INCLUDE AS MUCH DATA AS FEASIBLE WHILE AVOIDING CLUTTER IN AN ALREADY BUSY AREA OF THE FIGURE.

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RIPRAP FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER GRATE PARKING ABANDONED RAILROAD ABANDONED RAILROAD PARKING SUBSTATION 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 2.0 4.0 6.0 8.0 8.0 10.0 10.0 6.0 8.0 6.0 4.0 2.0 0.5 2.0 4.0 6.0 8.0 10.0 10.0 8.0 6.0 4.0 CST-6 CST-9 W-20 W-23 W-28 W-29 W-30 W-31 SW-2B SW-2A SW-1A SOUTH BRIDGE SW-3 1500 FT TO EAST NORTH BRIDGE SW-4 1600 FT TO NE MW-16D (NM)

MW-15K-1A (6.33)

MW-1A-2A (10.40)

MW-1I-1A (11.94)

MW-1I-2A (NM)

W-3 (3.92)

W-5 (NM)

W-9 (7.50)

W-12 (8.53)

W-15 (9.82)

W-16 (13.92)

W-24 (9.30)

W-52 (NM)

W-53 (NM)

W-55 (NM)

W-62 (NM)

W-64 (2.64)

W-65 (3.38)

W-67 (3.99)

W-71 (6.26)

W-72 (4.59)

CST-2 (NM)

LW-1 (NM)

LW-2 (NM)

LW-3 (NM)

MW-1G-6A (NM)

MW-1G-2A (NM)

MW-1G-1A (NM)

W-51 (NM)

W-50 (NM)

W-22 (NM)

W-19 (NM)

W-27 (NM)

W-18 (NM)

W-25 (NM)

W-26 (NM)

W-2B (NM)

W-3B (NM)

W-4B (NM)

W-7 (NM)

W-21 W-32 W-33 SW-5A W-54 (NM)

W-1B (13.63) 12.0 12.0 12.0 12.0 LEGEND APPROXIMATE PROPERTY BOUNDARY CAPE MAY/FILL FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED CAPE MAY/FILL FORMATION MONITORING W-20 WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 5 December 2025 - 2:11 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D129_WA-001.DWG Date Drafting Check Project Manager Project No.

Title Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

50 100 ft 100.000000 0.01 POTENTIOMETRIC SURFACE FIGURE 3.5 CONTOURS CAPE MAY FORMATION - APRIL 2024 HOLTEC DECOMMISSIONING INTERNATIONAL Project BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 (8.05)

(NM)

ELEVATION AS SHOWN NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

2.

MINOR CONTOUR INACCURACIES NEAR THE BUILDINGS RESULT FROM THE GRID RESOLUTION OF THE SOURCE FILE AND SIGNIFICANT CHANGES IN GROUNDWATER ELEVATIONS OVER SHORT DISTANCES. THE CONTOURS WERE ADJUSTED TO INCLUDE AS MUCH DATA AS FEASIBLE WHILE AVOIDING CLUTTER IN AN ALREADY BUSY AREA OF THE FIGURE.

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RIPRAP FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER GRATE PARKING ABANDONED RAILROAD ABANDONED RAILROAD PARKING SUBSTATION 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 2.0 4.0 6.0 8.0 8.0 10.0 10.0 6.0 4.0 2.0 2.0 4.0 6.0 8.0 10.0 10.0 8.0 6.0 4.0 CST-6 CST-9 W-20 W-23 W-28 W-29 W-30 W-31 SW-2B SW-2A SW-1A SOUTH BRIDGE SW-3 1500 FT TO EAST NORTH BRIDGE SW-4 1600 FT TO NE MW-16D (NM)

MW-15K-1A (2.98)

MW-1A-2A (7.02)

MW-1I-1A (8.86)

MW-1I-2A (NM)

W-3 (2.70)

W-5 (NM)

W-9 (4.92)

W-12 (7.49)

W-15 (8.64)

W-16 (10.42)

W-24 (5.73)

W-52 (NM)

W-53 (NM)

W-54 (NM)

W-55 (NM)

W-62 (NM)

W-64 (1.91)

W-65 (1.96)

W-67 (2.52)

W-71 (4.18)

W-72 (3.45)

W-1B (9.93)

CST-2 (NM)

LW-1 (NM)

LW-2 (NM)

LW-3 (NM)

MW-1G-6A (NM)

MW-1G-2A (NM)

MW-1G-1A (NM)

W-51 (NM)

W-50 (NM)

W-22 (NM)

W-19 (NM)

W-27 (NM)

W-18 (NM)

W-25 (NM)

W-26 (NM)

W-2B (NM)

W-3B (NM)

W-4B (NM)

W-7 (NM)

W-21 W-32 W-33 SW-5A LEGEND APPROXIMATE PROPERTY BOUNDARY CAPE MAY/FILL FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED CAPE MAY/FILL FORMATION MONITORING W-20 WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 5 December 2025 - 2:11 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D130_WA-001.DWG Date Drafting Check Project Manager Project No.

Title Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

50 100 ft 100.000000 0.01 POTENTIOMETRIC SURFACE FIGURE 3.6 CONTOURS CAPE MAY FORMATION - OCTOBER 2024 HOLTEC DECOMMISSIONING INTERNATIONAL Project BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 (8.05)

(NM)

ELEVATION AS SHOWN NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

2.

MINOR CONTOUR INACCURACIES NEAR THE BUILDINGS RESULT FROM THE GRID RESOLUTION OF THE SOURCE FILE AND SIGNIFICANT CHANGES IN GROUNDWATER ELEVATIONS OVER SHORT DISTANCES. THE CONTOURS WERE ADJUSTED TO INCLUDE AS MUCH DATA AS FEASIBLE WHILE AVOIDING CLUTTER IN AN ALREADY BUSY AREA OF THE FIGURE.

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RIPRAP FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER GRATE PARKING ABANDONED RAILROAD ABANDONED RAILROAD PARKING SUBSTATION 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 6.0 4.0 8.0 4.0 2.0 6.0 6.0 10.0 10.0 8.0 10.0 4.0 2.0 4.0 2.0 6.0 8.0 6.0 CST-6 CST-9 W-20 W-23 W-28 W-29 W-30 W-31 SW-2B SW-2A SW-1A SOUTH BRIDGE SW-3 1500 FT TO EAST NORTH BRIDGE SW-4 1600 FT TO NE MW-16D (NM)

MW-15K-1A (5.13)

MW-1A-2A (7.78)

MW-1I-1A (9.66)

MW-1I-2A (NM)

W-3 (3.65)

W-5 (NM)

W-9 (5.29)

W-12 (7.50)

W-15 (8.21)

W-16 (10.69)

W-24 (6.83)

W-52 (NM)

W-53 (NM)

W-54 (NM)

W-55 (NM)

W-62 (NM)

W-64 (1.91)

W-65 (2.02)

W-67 (2.74)

W-71 (4.26)

W-72 (3.65)

W-1B (9.53)

CST-2 (NM)

LW-1 (NM)

LW-2 (NM)

LW-3 (NM)

MW-1G-6A (NM)

MW-1G-2A (NM)

MW-1G-1A (NM)

W-51 (NM)

W-50 (NM)

W-22 (NM)

W-19 (NM)

W-27 (NM)

W-18 (NM)

W-25 (NM)

W-26 (NM)

W-2B (NM)

W-3B (NM)

W-4B (NM)

W-7 (NM)

W-21 W-32 W-33 SW-5A LEGEND APPROXIMATE PROPERTY BOUNDARY CAPE MAY/FILL FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED CAPE MAY/FILL FORMATION MONITORING W-20 WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 5 December 2025 - 2:12 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D123_WA-001.DWG Date Drafting Check Project Manager Project No.

Title Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

50 100 ft 100.000000 0.01 POTENTIOMETRIC SURFACE FIGURE 3.7 CONTOURS CAPE MAY FORMATION - APRIL 2025 HOLTEC DECOMMISSIONING INTERNATIONAL Project BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 (8.05)

(NM)

ELEVATION AS SHOWN NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

2.

MINOR CONTOUR INACCURACIES NEAR THE BUILDINGS RESULT FROM THE GRID RESOLUTION OF THE SOURCE FILE AND SIGNIFICANT CHANGES IN GROUNDWATER ELEVATIONS OVER SHORT DISTANCES. THE CONTOURS WERE ADJUSTED TO INCLUDE AS MUCH DATA AS FEASIBLE WHILE AVOIDING CLUTTER IN AN ALREADY BUSY AREA OF THE FIGURE.

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 18 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RWS CB CB RW UNDER CONSTRUCTION RIPRAP RIPRAP RIPRAP RIPRAP RIPRAP RW RIPRAP RW RW RWS RIPRAP RWS RIPRAP RW RW RW RW RIPRAP VENT STACK FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE TANKS GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR RW RW RW RW DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER STACK PARKING SMOKE GRATE PARKING PARKING RW RW PARKING RIPRAP RIPRAP ABANDONED RAILROAD ABANDONED RAILROAD RIPRAP SW SW RW RW RW RW RW PARKING PARKING PARKING ABANDONED RR BRIDGE SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION ABANDONED RAILROAD EXISTING SEWER EASEMENT DB4023 PAGE 54.

(LACEY M.U.A.) DB 4925 PAGE 666.

50' ROAD EASEMENT ACCESS INTAKE CANAL INTAKE CANAL 50' ROAD EASEMENT ACCESS LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL INTAKE CANAL INTAKE CANAL DISCHARGE CANAL DISCHARGE CANAL 50' UTILITY EASEMENT (MAP REF. 1)

U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 50' ROAD EASEMENT ACCESS 50' UTILITY EASEMENT U.S. HIGHWAY ROUTE 9 C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS FIRE POND APPROXIMATELY 1500' UPSTREAM OF BRIDGE WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 1.0 1.5 2.0 2.5 2.5 2.0 1.5 1.0 3.5 3.0 SW-1A SW-2B SW-2A SW-4B SW-4A SW-3B SW-3A SW-5A W-6 (1.81)

W-10 (3.64)

W-14 (3.48)

W-34 (3.19)

W-56I (1.65)

W-57I (1.65)

W-59I (1.84)

W-4A (3.39)

W-1A (NM)

LW-4 (NM)

MW-1G-1B (NM)

W-1 (NM)

W-2A (NM)

W-2 (NM)

W-2C (NM)

W-3A (NM)

W-13 (NM)

W-4 (1.73)

W-61I (2.19)

NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

LEGEND APPROXIMATE PROPERTY BOUNDARY SHALLOW COHANSEY FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 23 September 2025 - 2:51 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D131_WA-001.DWG Date Drafting Check Project Manager Project No.

Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved HOLTEC DECOMMISSIONING INTERNATIONAL J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

75 150 ft 150.000011 0.0 067 SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION Title POTENTIOMETRIC SURFACE CONTOURS - GROUNDWATER COHANSEY FORMATION

- APRIL 2022 (3.26)

(NM)

ELEVATION AS SHOWN FIGURE 3.8

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 18 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RWS CB CB RW UNDER CONSTRUCTION RIPRAP RIPRAP RIPRAP RIPRAP RIPRAP RW RIPRAP RW RW RWS RIPRAP RWS RIPRAP RW RW RW RW RIPRAP VENT STACK FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE TANKS GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR RW RW RW RW DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER STACK PARKING SMOKE GRATE PARKING PARKING RW RW PARKING RIPRAP RIPRAP ABANDONED RAILROAD ABANDONED RAILROAD RIPRAP SW SW RW RW RW RW RW PARKING PARKING PARKING ABANDONED RR BRIDGE SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION ABANDONED RAILROAD EXISTING SEWER EASEMENT DB4023 PAGE 54.

(LACEY M.U.A.) DB 4925 PAGE 666.

50' ROAD EASEMENT ACCESS INTAKE CANAL INTAKE CANAL 50' ROAD EASEMENT ACCESS LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL INTAKE CANAL INTAKE CANAL DISCHARGE CANAL DISCHARGE CANAL 50' UTILITY EASEMENT (MAP REF. 1)

U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 50' ROAD EASEMENT ACCESS 50' UTILITY EASEMENT U.S. HIGHWAY ROUTE 9 C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS FIRE POND APPROXIMATELY 1500' UPSTREAM OF BRIDGE WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 1.0 1.5 2.0 2.5 3.0 3.0 2.5 2.0 1.5 1.0 4.0 3.5 SW-1A SW-2B SW-2A SW-4B SW-4A SW-3B SW-3A SW-5A W-6 (1.97)

W-10 (3.94)

W-14 (4.09)

W-34 (3.97)

W-56I (2.60)

W-57I (2.13)

W-59I (2.52)

W-4A (3.80)

W-1A (2.58)

LW-4 (NM)

MW-1G-1B (NM)

W-1 (NM)

W-2A (NM)

W-2 (NM)

W-2C (NM)

W-3A (NM)

W-13 (3.74)

W-4 (2.03)

W-61I (2.77)

NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

LEGEND APPROXIMATE PROPERTY BOUNDARY SHALLOW COHANSEY FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 23 September 2025 - 2:52 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D132_WA-001.DWG Date Drafting Check Project Manager Project No.

Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved HOLTEC DECOMMISSIONING INTERNATIONAL J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

75 150 ft 150.000011 0.0 067 SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION Title POTENTIOMETRIC SURFACE CONTOURS - GROUNDWATER COHANSEY FORMATION

- OCTOBER 2022 (3.26)

(NM)

ELEVATION AS SHOWN FIGURE 3.9

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 18 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RWS CB CB RW UNDER CONSTRUCTION RIPRAP RIPRAP RIPRAP RIPRAP RIPRAP RW RIPRAP RW RW RWS RIPRAP RWS RIPRAP RW RW RW RW RIPRAP VENT STACK FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE TANKS GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR RW RW RW RW DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER STACK PARKING SMOKE GRATE PARKING PARKING RW RW PARKING RIPRAP RIPRAP ABANDONED RAILROAD ABANDONED RAILROAD RIPRAP SW SW RW RW RW RW RW PARKING PARKING PARKING ABANDONED RR BRIDGE SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION ABANDONED RAILROAD EXISTING SEWER EASEMENT DB4023 PAGE 54.

(LACEY M.U.A.) DB 4925 PAGE 666.

50' ROAD EASEMENT ACCESS INTAKE CANAL INTAKE CANAL 50' ROAD EASEMENT ACCESS LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL INTAKE CANAL INTAKE CANAL DISCHARGE CANAL DISCHARGE CANAL 50' UTILITY EASEMENT (MAP REF. 1)

U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 50' ROAD EASEMENT ACCESS 50' UTILITY EASEMENT U.S. HIGHWAY ROUTE 9 C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS FIRE POND APPROXIMATELY 1500' UPSTREAM OF BRIDGE WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 1.0 1.5 2.0 2.5 2.5 2.0 1.5 1.0 3.5 3.0 SW-1A SW-2B SW-2A SW-4B SW-4A SW-3B SW-3A SW-5A W-6 (2.09)

W-10 (3.98)

W-14 (3.68)

W-34 (3.37)

W-56I (2.10)

W-57I (1.93)

W-59I (2.16)

W-61I (2.54)

W-4A (3.50)

W-1A (1.78)

LW-4 (NM)

MW-1G-1B (NM)

W-1 (NM)

W-2A (NM)

W-2 (NM)

W-2C (NM)

W-3A (NM)

W-13 (3.29)

W-4 (2.00)

NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

LEGEND APPROXIMATE PROPERTY BOUNDARY SHALLOW COHANSEY FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 23 September 2025 - 2:52 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D133_WA-001.DWG Date Drafting Check Project Manager Project No.

Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved HOLTEC DECOMMISSIONING INTERNATIONAL J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

75 150 ft 150.000011 0.0 067 SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION Title POTENTIOMETRIC SURFACE CONTOURS - GROUNDWATER COHANSEY FORMATION

- APRIL 2023 (3.26)

(NM)

ELEVATION AS SHOWN FIGURE 3.10

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 18 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RWS CB CB RW UNDER CONSTRUCTION RIPRAP RIPRAP RIPRAP RIPRAP RIPRAP RW RIPRAP RW RW RWS RIPRAP RWS RIPRAP RW RW RW RW RIPRAP VENT STACK FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE TANKS GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR RW RW RW RW DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER STACK PARKING SMOKE GRATE PARKING PARKING RW RW PARKING RIPRAP RIPRAP ABANDONED RAILROAD ABANDONED RAILROAD RIPRAP SW SW RW RW RW RW RW PARKING PARKING PARKING ABANDONED RR BRIDGE SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION ABANDONED RAILROAD EXISTING SEWER EASEMENT DB4023 PAGE 54.

(LACEY M.U.A.) DB 4925 PAGE 666.

50' ROAD EASEMENT ACCESS INTAKE CANAL INTAKE CANAL 50' ROAD EASEMENT ACCESS LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL INTAKE CANAL INTAKE CANAL DISCHARGE CANAL DISCHARGE CANAL 50' UTILITY EASEMENT (MAP REF. 1)

U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 50' ROAD EASEMENT ACCESS 50' UTILITY EASEMENT U.S. HIGHWAY ROUTE 9 C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS FIRE POND APPROXIMATELY 1500' UPSTREAM OF BRIDGE WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 1.0 1.5 2.0 2.5 3.0 3.0 2.5 2.0 1.5 1.0 4.0 3.5 SW-1A SW-2B SW-2A SW-4B SW-4A SW-3B SW-3A SW-5A W-6 (2.85)

W-10 (4.46)

W-14 (4.14)

W-34 (3.93)

W-56I (2.90)

W-57I (2.81)

W-59I (3.00)

W-61I (2.97)

W-4A (3.95)

W-1A (2.92)

LW-4 (NM)

MW-1G-1B (NM)

W-1 (NM)

W-2A (NM)

W-2 (NM)

W-2C (NM)

W-3A (NM)

W-13 (3.85)

W-4 (2.84)

NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

LEGEND APPROXIMATE PROPERTY BOUNDARY SHALLOW COHANSEY FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 23 September 2025 - 2:52 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D134_WA-001.DWG Date Drafting Check Project Manager Project No.

Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved HOLTEC DECOMMISSIONING INTERNATIONAL J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

75 150 ft 150.000011 0.0 067 SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION Title POTENTIOMETRIC SURFACE CONTOURS - GROUNDWATER COHANSEY FORMATION

- OCTOBER 2023 (3.26)

(NM)

ELEVATION AS SHOWN FIGURE 3.11

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 18 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RWS CB CB RW UNDER CONSTRUCTION RIPRAP RIPRAP RIPRAP RIPRAP RIPRAP RW RIPRAP RW RW RWS RIPRAP RWS RIPRAP RW RW RW RW RIPRAP VENT STACK FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE TANKS GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR RW RW RW RW DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER STACK PARKING SMOKE GRATE PARKING PARKING RW RW PARKING RIPRAP RIPRAP ABANDONED RAILROAD ABANDONED RAILROAD RIPRAP SW SW RW RW RW RW RW PARKING PARKING PARKING ABANDONED RR BRIDGE SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION ABANDONED RAILROAD EXISTING SEWER EASEMENT DB4023 PAGE 54.

(LACEY M.U.A.) DB 4925 PAGE 666.

50' ROAD EASEMENT ACCESS INTAKE CANAL INTAKE CANAL 50' ROAD EASEMENT ACCESS LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL INTAKE CANAL INTAKE CANAL DISCHARGE CANAL DISCHARGE CANAL 50' UTILITY EASEMENT (MAP REF. 1)

U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 50' ROAD EASEMENT ACCESS 50' UTILITY EASEMENT U.S. HIGHWAY ROUTE 9 C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS FIRE POND APPROXIMATELY 1500' UPSTREAM OF BRIDGE WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 1.0 1.5 2.0 2.5 2.5 2.0 1.5 1.0 3.5 3.0 SW-1A SW-2B SW-2A SW-4B SW-4A SW-3B SW-3A SW-5A W-6 (NM)

W-10 (4.28)

W-14 (NM)

W-34 (4.18)

W-56I (2.27)

W-57I (2.04)

W-59I (2.21)

W-61I (NM)

W-4A (NM)

W-1A (NM)

LW-4 (NM)

MW-1G-1B (NM)

W-1 (NM)

W-2A (NM)

W-2 (NM)

W-2C (NM)

W-3A (NM)

W-13 (3.56)

W-4 (2.10)

NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

LEGEND APPROXIMATE PROPERTY BOUNDARY SHALLOW COHANSEY FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 23 September 2025 - 2:53 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D135_WA-001.DWG Date Drafting Check Project Manager Project No.

Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved HOLTEC DECOMMISSIONING INTERNATIONAL J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

75 150 ft 150.000011 0.0 067 SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION Title POTENTIOMETRIC SURFACE CONTOURS - GROUNDWATER COHANSEY FORMATION

- APRIL 2024 (3.26)

(NM)

ELEVATION AS SHOWN FIGURE 3.12

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 18 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RWS CB CB RW UNDER CONSTRUCTION RIPRAP RIPRAP RIPRAP RIPRAP RIPRAP RW RIPRAP RW RW RWS RIPRAP RWS RIPRAP RW RW RW RW RIPRAP VENT STACK FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE TANKS GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR RW RW RW RW DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER STACK PARKING SMOKE GRATE PARKING PARKING RW RW PARKING RIPRAP RIPRAP ABANDONED RAILROAD ABANDONED RAILROAD RIPRAP SW SW RW RW RW RW RW PARKING PARKING PARKING ABANDONED RR BRIDGE SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION ABANDONED RAILROAD EXISTING SEWER EASEMENT DB4023 PAGE 54.

(LACEY M.U.A.) DB 4925 PAGE 666.

50' ROAD EASEMENT ACCESS INTAKE CANAL INTAKE CANAL 50' ROAD EASEMENT ACCESS LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL INTAKE CANAL INTAKE CANAL DISCHARGE CANAL DISCHARGE CANAL 50' UTILITY EASEMENT (MAP REF. 1)

U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 50' ROAD EASEMENT ACCESS 50' UTILITY EASEMENT U.S. HIGHWAY ROUTE 9 C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

M.H.

OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS FIRE POND APPROXIMATELY 1500' UPSTREAM OF BRIDGE WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 1.0 1.5 2.0 2.5 2.5 2.0 1.5 1.0 3.5 3.0 SW-1A SW-2B SW-2A SW-4B SW-4A SW-3B SW-3A SW-5A W-6 (NM)

W-10 (3.53)

W-14 (NM)

W-34 (2.83)

W-56I (1.79)

W-57I (1.86)

W-59I (2.03)

W-4A (NM)

W-1A (NM)

LW-4 (NM)

MW-1G-1B (NM)

W-1 (NM)

W-2A (NM)

W-2 (NM)

W-2C (NM)

W-3A (NM)

W-13 (2.90)

W-4 (1.90)

W-61I (NM)

NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

LEGEND APPROXIMATE PROPERTY BOUNDARY SHALLOW COHANSEY FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 23 September 2025 - 2:53 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D136_WA-001.DWG Date Drafting Check Project Manager Project No.

Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved HOLTEC DECOMMISSIONING INTERNATIONAL J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

75 150 ft 150.000011 0.0 067 SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION Title POTENTIOMETRIC SURFACE CONTOURS - GROUNDWATER COHANSEY FORMATION

- OCTOBER 2024 (3.26)

(NM)

ELEVATION AS SHOWN FIGURE 3.13

PROCESSING BUILDING NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 18 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

SALLY PORT 60' SLIDE HYDROGEN STORAGE AREA 27' x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x x

x LIGHTING FIXTURE (TYP)

TANK TANK PARKING DOCK RWS CB CB RW UNDER CONSTRUCTION RIPRAP RIPRAP RIPRAP RIPRAP RIPRAP RW RIPRAP RW RW RWS RIPRAP RWS RIPRAP RW RW RW RW RIPRAP VENT STACK FWT TWST PARKING PARKING MOST PARKING PARKING PARKING GRATE TANKS GRATE PAVED GUTTER PAVED GUTTER DOCK OH WALK CST PARKING PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR RW RW RW RW DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER STACK PARKING SMOKE GRATE PARKING PARKING RW RW PARKING RIPRAP RIPRAP ABANDONED RAILROAD ABANDONED RAILROAD RIPRAP SW SW RW RW RW RW RW PARKING PARKING PARKING ABANDONED RR BRIDGE SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION SUBSTATION ABANDONED RAILROAD EXISTING SEWER EASEMENT DB4023 PAGE 54.

(LACEY M.U.A.) DB 4925 PAGE 666.

50' ROAD EASEMENT ACCESS INTAKE CANAL INTAKE CANAL 50' ROAD EASEMENT ACCESS LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP LACEY TOWNSHIP OCEAN TOWNSHIP 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1) 50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL INTAKE CANAL INTAKE CANAL DISCHARGE CANAL DISCHARGE CANAL 50' UTILITY EASEMENT (MAP REF. 1)

U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 50' ROAD EASEMENT ACCESS 50' UTILITY EASEMENT U.S. HIGHWAY ROUTE 9 C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

C.B.

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OFFICE BUILDING TURBINE GENERATOR BUILDING SITE EMERGENCY BUILDING AUXILIARY OFFICE BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING MATERIAL WAREHOUSE OFF GAS BUILDING HOUSE BOILER LOW LEVEL RADWASTE STORAGE FACILITY DISCHARGE CANAL TRAILER GENERATOR BUILDING OLD MACHINE SHOP BULDING 4 DIESEL OCAB TRAILER TRAILER TRAILER BRE BRE BRE BRE BRE BRE BRE WDT PRETREAT BUILDING SURGE TANK OFFGAS STACK TUNNEL COND XFER DISCHARGE TUNNELS COOLING WATER TUNNELS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS WETLANDS FIRE POND APPROXIMATELY 1500' UPSTREAM OF BRIDGE WETLAND ELEVATION NOT AVAILABLE (TYP.)

0.5 0.5 1.0 1.0 1.5 1.5 2.0 2.0 3.0 SW-1A SW-2B SW-2A SW-4B SW-4A SW-3B SW-3A SW-5A W-6 (NM)

W-10 (3.22)

W-14 (NM)

W-34 (2.88)

W-56I (1.36)

W-57I (1.48)

W-59I (1.79)

W-61I (NM)

W-4A (NM)

W-1A (NM)

LW-4 (NM)

MW-1G-1B (NM)

W-1 (NM)

W-2A (NM)

W-2 (NM)

W-2C (NM)

W-3A (NM)

W-13 (2.57)

W-4 (1.14) 2.5 NOTE:

1.

MONITORING WELL SURFACE ELEVATIONS WERE OBTAINED RELATIVE TO NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD 88). GROUNDWATER MONITORING WELL LOCATIONS (HORIZONTALLY) VALUES WERE OBTAINED IN THE NEW JERSEY STATE PLANE COORDINATE SYSTEM (NAD 83).

LEGEND APPROXIMATE PROPERTY BOUNDARY SHALLOW COHANSEY FORMATION W-3B GROUNDWATER FLOW DIRECTION C.B.

M.H.

CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL EXISTING SURFACE WATER LOCATION GROUNDWATER AND SURFACE WATER POTENTIOMETRIC SURFACE CONTOUR 1.0 (FT. AMSL) (DASHED WHERE INFERRED)

NOT MEASURED MONITORING WELL LOCATION Plotted By: Kyle Jamieson Scale Design Check Client 23 September 2025 - 2:53 PM www.ghd.com Designer 1"

Plot Date:

Path and Filename: C:\\ADSK\\ACCDocs\\GHD Services Pty Ltd\\11230862-Enviro Projs\\Project Files\\11197486\\01 WIP\\Env\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D124_WA-001.DWG Date Drafting Check Project Manager Project No.

Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved HOLTEC DECOMMISSIONING INTERNATIONAL J. CAREY J. GARGES 11197486 September 2025 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

75 150 ft 150.000011 0.0 067 SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATION STATION Title POTENTIOMETRIC SURFACE CONTOURS - GROUNDWATER COHANSEY FORMATION

- APRIL 2025 (3.26)

(NM)

ELEVATION AS SHOWN FIGURE 3.14

NEW PA FENCE SMALL VEHICLE BARRIER DELAY FENCE 18 26 26 26 26 13 34 28 231 SPACES R=30' R=30' 26 6

R=5' R=5' 7'

60' SLIDE HYDROGEN STORAGE AREA 27' x

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DOCK RIPRAP MOST PAVED GUTTER PAVED GUTTER DOCK OH WALK PAVED GUTTER PAVED GUTTER ABANDONED RR ABANDONED RR ABANDONED RR RW RW RW RW DOCK PAVED GUTTER PAVED GUTTER PAVED GUTTER PAVED GUTTER PARKING ABANDONED RAILROAD ABANDONED RAILROAD EXISTING SEWER EASEMENT DB4023 PAGE 54.

50' UTILITY EASEMENT (MAP REF. 1)

INTAKE CANAL INTAKE CANAL U.S. HIGHWAY ROUTE 9 U.S. HIGHWAY ROUTE 9 50' UTILITY EASEMENT U.S. HIGHWAY ROUTE 9 C.B.

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DISCHARGE CANAL WETLANDS WETLANDS WETLANDS WETLAND ELEVATION NOT AVAILABLE (TYP.)

SW-2B SW-2A SW-1A SW-5A NORTH BRIDGE SW-4 1600 FT TO NE W-17 211 ISO CONDENSOR VENTS 571 TURBINE SUMP (TYP) 233 SOLID RADWASTE SYSTEM 251 SPENT FUEL POOL COOLING 215 REACTOR WATER CLEANUP 444,445 AUX. BOILER STEAM AND CONDENSATE SYSTEM, HEATING STEAM SYSTEM 232 RADWASTE SAMPLE TANKS 532 EMERGENCY SERVICE WATER 575 LAUNDRY AND LAB DRAIN SYSTEM 576 OVERBOARD DISCHARGE PIPE 523 DEMINERALIZED WATER 542 TBCCW 243 PIPES FROM TORUS WATER STORAGE TANK TO TORUS 225 CRD 424 CONDENSATE TRANSFER SYSTEM 421 CONDENSATE 232 LIQUID RADWASTE SYSTEM 856 SERVICE AIR SYSTEM 534 NEW RADWASTE SERVICE WATER SYSTEM 243 PIPES FROM TORUS WATER STORAGE TANK TO TORUS 243 PIPES FROM TORUS WATER STORAGE TANK TO TORUS 312 TURBINE STEAM SEAL SYSTEM 541 REACTOR BUILDING CLOSED COOLING WATER 572 REACTOR BUILDING DRAINS SYSTEM 534 NEW RADWASTE SERVICE WATER SYSTEM 574 RADWASTE SUMP (TYP)

INTO INTAKE CANAL INTO DISCHARGE CANAL OFFICE BUILDING TURBINE GENERATOR BUILDING SECURITY BUILDING MAINTENANCE BUILDING OLD RADWASTE BUILDING REACTOR BUILDING NEW RADWASTE BUILDING BOILER OLD MACHINE SHOP PRETREAT BUILDING OFFGAS STACK TWST CST GUARD HOUSE WDT COND XFER 251 SPENT FUEL POOL COOLING SYSTEM TRANSFER BUILDING 578 CONDENSATE 577 MISC. BUILDING SUMPS AND WASTE STORAGE FACILITY SUMPS 572 REACTOR BUILDING SUMP (TYP)

W-2B W-3B W-4B MW-1G-1A (MW-28-1A)

LW-1 LW-2 LW-3 MW-1G-2A MW-1G-6A W-1A W-2A MW-1G-1B W-3A W-4A LW-4 W-1B North Domestic Well CST-6 CST-9 W-20 W-21 W-23 W-28 W-29 W-30 W-31 W-32 W-33 MW-50 MW-51 MW-52 MW-53 MW-54 MW-55 MW-64 MW-65 MW-67 CST-2 W-3 W-5 W-7 W-19 W-22 W-24 W-25 W-26 W-27 MW-1I-2A (MW-26-2A)

MW-15K-1A (MW-27-1A)

W-16 W-12 W-9 MW-16D MW-1I-1A (MW-26-1A)

W-15 MW-1A-2A (MW-25-2A)

MW-62 MW-60 I MW-63 I MW-58 I MW-61 I MW-56 I MW-57 I MW-59 I W-2 W-4 W-6 W-34 MW-70 I W-13 MW-68 I MW-69 I W-14 W-10 MW-66 I South Domestic Well W-18 MW-72 MW-71

1. 28

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1. 29/#33 LEGEND LIMITS OF AFE 1 CAPE MAY/FILL FORMATION W-3B C.B.

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CATCH BASIN MANHOLE SURFACE WATER FLOW DIRECTION UNDERGROUND TUNNEL CAPE MAY/FILL FORMATION MONITORING W-20 WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION MW-63 I DEEP COHANSEY FORMATION W-4C INTERMEDIATE COHANSEY FORMATION W-13 SHALLOW COHANSEY FORMATION W-2 SHALLOW COHANSEY FORMATION MONITORING WELL LOCATION DAMAGED/INACCESSIBLE MONITORING WELL LOCATION MONITORING WELL LOCATION MONITORING WELL LOCATION PRIVATE/PUBLIC WATER SUPPLY WELL LOCATION KIRKWOOD FORMATION SYSTEMS IDENTIFIED BY STATION PERSONNEL THAT CONTAIN OR POTENTIALLY CONTAINED TRITIUM 215 REACTOR WATER CLEANUP 225 CRD 243 PIPES FROM TORUS WATER STORAGE TANK TO TORUS 251 SPENT FUEL POOL COOLING 312 TURBINE STEAM SEAL SYSTEM 421 CONDENSATE 424 CONDENSATE TRANSFER SYSTEM 444,445 AUX. BOILER STEAM AND CONDENSATE SYSTEM, HEATING STEAM SYSTEM 523 DEMINERALIZED WATER 532 EMERGENCY SERVICE WATER 541 REACTOR BUILDING CLOSED COOLING WATER 542 TBCCW 577 MISC. BUILDING SUMPS AND WASTE STORAGE FACILITY SUMPS 232 LIQUID RADWASTE SYSTEM 534 NEW RADWASTE SERVICE WATER SYSTEM 233 SOLID RADWASTE SYSTEM 571 TURBINE BUILDING SUMPS 572 REACTOR BUILDING SUMPS AND DRAINS SYSTEM 575 LAUNDRY AND LAB DRAIN SYSTEM 576 OVERBOARD DISCHARGE PIPE 578 CONDENSATE TRANSFER BUILDING SYSTEM 856 SERVICE AIR SYSTEM NOTES:

1.

ALL PIPING SHOWN ON THE DRAWING POTENTIALLY CONTAINED TRITIATED WATER.

2.

ONLY THOSE PORTIONS OF THE SYSTEMS DOWNSTREAM OF ANY POTENTIAL TRITIUM CONTAMINATION ARE DEPICTED ON THIS FIGURE.

3.

SYSTEMS INCLUDED ON THE FIGURE SCREENED ABOVE AN ARBITRARY THRESHOLD SCREENING VALUE OF 640.

211 ISO CONDENSER VENTS 574 RADWASTE SUMPS SECURITY IMPROVEMENT PROJECT, ACAD-SITE PLAN, 9-22-04 Plotted By: Peter McLean Scale Design Check Client 29 October 2025 - 8:29 AM www.ghd.com Designer 1"

Plot Date:

Path and Filename: N:\\US\\Edison\\Projects\\564\\11197486\\Digital_Design\\ACAD\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D103_WA-001.DWG Date Drafting Check Project Manager Project No.

Title Project Director This document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHDs client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.

Author ANSI D Size 0

Bar is one inch on original size sheet Conditions of Use Sheet No.

Issue No.

Date Checked Approved HOLTEC DECOMMISSIONING INTERNATIONAL J. CAREY J. GARGES 11197486-12 APRIL 2022 1240 North Mountain Road Harrisburg PA 17112 USA T 1 717 541 0622 F 1 717 441 0161 W www.ghd.com GHD Inc.

N 0

50 100 ft 100.000000 0.01 FIGURE 4.1 BIRDSALL ENGINEERING INC., OYSTER CREEK GENERATING STATION OYSTER CREEK 50.75g RELEASE AND SPILL LOCATIONS AS SHOWN HISTORICAL RADIOLOGICAL RELEASES AND SPILL LOCATIONS

Date Project No.

Filename: N:\\US\\Edison\\Projects\\564\\11197486\\Digital_Design\\ACAD\\Figures\\RPT001\\11197486-GHD-00-00-RPT-EN-D122_WA-001.dwg Plot Date: 25 August 2023 12:02 PM 11197486-12 August 2023 FIGURE 3.15 HOLTEC DECOMMISIONING INTERNATIONAL OYSTER CREEK GENERATING STATION FORKED RIVER, NEW JERSEY CONCEPTUAL SITE MODEL

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 8 Tables

Table 4.1 - Evaluation of Monitoring Well and 50.75g Locations Monitoring Well Approximate Distance from Location (ft)

Direction from Location Gradient from Location Monitoring Well Approximate Distance from Location (ft)

Direction from Location Gradient from Location 1 through 5 These are sections in the 50.75G report and are not actual release or sampling locations.

NA NA NA NA NA NA NA NA NA 6

Soil Transferred from RCA to Now North Parking Lot; Soil covered with 6" of clean soil & Paved (1982)

W-1B 90 North Downgradient W-1A 90 North Downgradient Yes 7

Water Sample Results from Sidegradient &

Downgradient of CST (1991)

MW-50 and MW-55 25 West-southwest Downgradient MW-57I 85 West-southwest Downgradient No 8

Dumpster-Intake Screen Debris & Low Lvl Radioactive Cont. Soil Disposed in Offsite Landfill (1997)

MW-72 100 West-nortwest Downgradient W-13 200 Northwest Downgradient No 9

Memo 6630-92-0110 Lvl D Area Soil Sampling (1992)

W-15 315 Southwest Downgradient MW-1G-1B 650 North-northeast Downgradient Yes 10 RCA Yard Soil Sampling (1982)

MW-1A-2A (MW-25-2A) 240 Southwest Downgradient MW-1G-1B W-14 950 145 Northeast Northwest Downgradient Lateral Yes 11 Soil Sampling Prior to Building the OCAB (1993)

No MWs at or downgradient of this location NA NA NA No MWs at or downgradient of this location NA NA NA Yes 12 Contractor Lot Surface Soil Sampling - 250 Trailer Complex (1994)

No MWs at or downgradient of this location NA NA NA No MWs at or downgradient of this location NA NA NA Yes 13 Contractor Parking Lot Soil Samples (1992)

MW-1A-2A (MW-25-2A) 560 Southwest Downgradient MW-1G-1B 690 North-northeast Downgradient Yes 14 ESSF Soil Samples (1985)

MW-1I-2a (MW-26-2A) 50 Southwest Downgradient W-6 160 Southwest Southwest Yes 15 Soil Sampling Proposed New Gas Station (1993)

MW-1G-1A MW-1G-2A 90 90 North-northeast North-northwest Lateral Lateral MW-1G-1B 90 North-northeast North-northeast Yes 16 ORW Surge Tank (1982)

MW-1G-1A MW-1G-2A 90 90 North-northeast North-northwest Lateral Lateral MW-1G-1B 90 North-northeast North-northeast Yes 17 RCA Fence Line at TWST (1986)

MW-1I-1A (MW-26-1A) 0 At this location NA W-6 110 Northwest Lateral Yes 18 DBT Project Soil Sampling (2004)

No MWs at or downgradient of this location NA NA NA No MWs at or downgradient of this location NA NA NA Yes 19 Miscellaneous soil sampling between 1986 and 2007 not related to spills NA NA NA NA NA NA NA NA NA 20a Brushes Used to Clean Tubes (2006)

MW-67/CST-6 CST-2/MW-51 100 150 Northwest Northwest Downgradient Downgradient MW-56I MW-57 175 260 West West Downgradient Downgradient No 20b RCA Yard Spill (2004)

MW-1A-2A (MW-25-2A) 200 Southwest Downgradient No MWs at or downgradient of this location NA NA NA Yes 20c RCA Storm Drain; East of NRW (2004)

MW-15 0

At this location NA W-14 0

At this location At this location Yes 20d Makeup to De-aerator Tank Fail; SW of Boiler House; Within RCA (2003)

MW-71 150 West-nortwest Downgradient W-14 350 Northeast Downgradient Yes 20e Sink Hole within RCA (2003)

W-12 140 Southwest Downgradient W-1A 560 North Downgradient Yes Location 50.75G Description Cape May Formation Cohansey Formation Clay Layer-Aquitard Expected to be Intact?

Table 4.1 - Evaluation of Monitoring Well and 50.75g Locations Monitoring Well Approximate Distance from Location (ft)

Direction from Location Gradient from Location Monitoring Well Approximate Distance from Location (ft)

Direction from Location Gradient from Location Location 50.75G Description Cape May Formation Cohansey Formation Clay Layer-Aquitard Expected to be Intact?

20f Weld Leak Under #2 Boiler Flash Tank; Within RCA (2003)

MW-71 150 West Downgradient W-14 315 Northeast Downgradient Yes 20g Leak from Bottom of Fan While Aligning EF-1-7 (2003)

W-71 65 West Downgradient W-10 W-13 110 310 South-southwest North-northwest Lat areal - Downgradient Downgradient Yes 20h Moat Overflow During Temp Modification for Water Transfer from Radwaste/Chemwaste to TWST (2003)

MW-1I-2A (MW-26-2A) 25 At this location NA W-6 160 Northwest Lateral Yes 20j EF-1-6 Exhaust Duct/Main Stack Water Leak (2002)

W-71 65 West Downgradient W-10 W-13 110 310 South-southwest North-northwest Lateral - Downgradient Downgradient Yes 21 Miscellaneous soil sampling areas and documentation NA NA NA NA NA NA NA NA NA 22 Oyster Creek Tritium Characterization (2006)

MW-65 25 West Downgradient MW-59 25 West Downgradient No 23 Oyster Creek Cesium Characterization (2007)

No MWs at or downgradient of this location NA NA NA No MWs at or downgradient of this location NA NA NA Yes 24 Isolation Condenser Initiation (2007)

W-72 W-71 100 120 Northwest Southwest Lateral Lateral W-13 W-14 220 170 North-northwest Northeast Downgradient Lateral No 25 Release Survey to Document Activity in DBT Spoils (2008)

No MWs at or downgradient of this location NA NA NA No MWs at or downgradient of this location NA NA NA Yes 26 Bravo Isolation Condenser Dripping Water After Shutdown (2009)

W-72 W-71 100 120 Northwest Southwest Lateral Lateral W-13 W-14 220 170 North-northwest Northeast Downgradient Lateral No 27 8" or 10" CST Line Leaks; Water Pumped from Concrete ESW Vault (2009)

MW-67 and CST-2 0

At this location NA MW-59I 140 West-northwest -

Downgradient West-northwest -

Downgradient No 28 CST Header Leak in Condenser Bay; West Wall Entry Point to Turbine Bldg. (2009)

MW-67 and CST-2 0

At this location NA MW-59I 140 West-northwest -

Downgradient West-northwest -

Downgradient No 29 Radioactive Water Spill during Frac Tank Filling with NRW Tank WC-T-1A Contents (2010)

MW-72 165 Southwest Downgradient MW-1A 700 North Downgradient Yes 30 Radioactive Water in Moat Area of ORW Sample Tank Shed (2011)

MW-71 65 Southeast Lateral W-13 260 North Downgradient No 31 Areas potentially impacted ISFSI (2011)

LW-1, 2 and 3 65 South Downgradient LW-4 W-3A 40 395 South Northeast Upgradient Downgradient Yes 32 Isolation Condenser Actuation Venting Steam to Environment due to Off-Site Power Loss (2012)

W-72 W-71 100 120 Northwest Southwest Lateral Lateral W-13 W-14 220 170 North-northwest Northeast Downgradient Lateral No 33 Leaks into Torus Room for Reactor Cavity/NRC Id's as Pt of Int. During Decommissioning HAS&LTP (2014)

MW-67/CST-6 280 West-northwest Downgradient W-13 240 North Downgradient No 34 Frmr Parking Lot Asphalt Sampling, S of OCAB-no Licensed Material Identified (2015)

No MWs at or downgradient of this location NA NA NA No MWs at or downgradient of this location NA NA NA Yes 35 Radioactive Water Spill into RCA from Vent in Refuel Cavity-Contained in Reactor Bldg (2016)

W-72 65 Northwest Lateral W-13 196 North Downgradient No 36 Radioactive Water Spill During Frac Tank Filling of Frac Tank with NRW Tank WC-T-1A Contents (2016)

MW-72 115 Southwest Downgradient MW-1A 715 North Downgradient Yes 37 Leak from Hose to RCA Yard Asphalt (2017)

W-13 80 West Downgradient W-13 W-2A 80 640 West Northwest Lateral to Downgradient Downgradient Yes

Table 4.1 - Evaluation of Monitoring Well and 50.75g Locations Monitoring Well Approximate Distance from Location (ft)

Direction from Location Gradient from Location Monitoring Well Approximate Distance from Location (ft)

Direction from Location Gradient from Location Location 50.75G Description Cape May Formation Cohansey Formation Clay Layer-Aquitard Expected to be Intact?

38 Leak on the MOB 3rd Floor (2018)

MW-15K-1 295 West Downgradient W-34 W-56I 160 300 West Downgradient Downgradient No 39 30-inch Header Sampling Pump Discharge No MWs at or downgradient of this location. Location is immediately adjacent to Discharge Canal NA NA NA No MWs at or downgradient of this location. Location is immediately adjacent to Discharge Canal NA NA NA No 40 Soil Relocation from North of OCAB No MWs at or downgradient of this location NA NA NA No MWs at or downgradient of this location NA NA NA Yes 41 Small Spill on Asphalt ORW Control Room (2019)

W-72 W-71 W-62 150 120 370 Northwest Southwest West Lateral to Downgradient Lateral to Downgradient Downgradient W-13 270 Northwest Downgradient No 42 Storage of RB 119 Foot Elevation Shield Blocks in RCA Yard W-72 100 West Downgradient W-13 170 Northwest Downgradient No 43 Not a release; clarification on procedures NA NA NA NA NA NA NA NA NA 44 Storage of Drywell Head Segments in Outdoor RMA W-5 60 South Lateral to Downgradient W-6 45 South Lateral Yes

Table 5.1 - ResRad Model and Site Hydrogeologic Parameters Hydrogeologic Parameter RESRAD Model Value Basis RESRAD Input Site-Specific Value Notes Contaminated Zone (CZ) Area (m2) 1539.6 Based on contaminated volume and height of RB wall.

No Value Calculated by GHD CZ Thickness (m) 13.1 CZ thickness set to RB wall height.

No Value Calculated by GHD Length Parallel to Aquifer Flow (m) 44.3 Set to diameter of CZ.

No Value Calculated by GHD Does the initial contamination penetrate the water table?

Yes Based on site features and RB dimensions.

No Value Calculated by GHD Contaminated fraction below water table 0.7326 Based on OCGS site data; average groundwater depths recorded for wells around the RB, TB, and ORB.

0.7635 Appears RESRAD number is average depth to water (DTW) in Cape May in 2016; Average DTW in 2021 and 2022 in Cape May wells near RB, TB, and ORB - 13.2 feet so fraction below water table is - 0.7635 (10.01 m of 13.11 m total CZ)

Cover depth (m) 0.91 3 ft cover assumed No Value Calculated by GHD GHD assumes cover dpeth = cover thickness Cover density (g/cm3) 1.5105 Site soil type = sand (2017 Hydrogeologic Investigation Report). Input for density of fill material = NUREG/CR-7267 density distribution for site soil type - sand.

1.5 Consistent with NJDEP assumptions (1.5 g/cm3) for generic loamy sand soil (See USDA Soil Triangle). NJDEP default Soil Type is Sandy Loam Cover Erosion Rate 0.0006 Assumed final site grade is level. Input for erosion rate = NUREG/CR-7267 erosion rate for site with shallow slope (i.e.,

relatively level)

No Value Calculated by GHD Density of contaminated zone (g/cm3) 1.5105 Site soil type = sand (2017 Hydrogeologic Investigation Report). Input for density of fill material = NUREG/CR-7267 density distribution for site soil type - sand.

1.5 Consistent with NJDEP assumptions (1.5 g/cm3) for generic loamy sand soil (See USDA Soil Triangle). NJDEP default Soil Type is Sandy Loam Contaminated zone erosion rate (m/y) 0.0006 Assumed same as cover No Value Calculated by GHD Contaminated zone total porosity 0.43 NUREG/CR-7267 distribution for site soil type -sand 0.41 NJDEP default total Porosity is 0.41. - per the NJDEP May 2021 - Soil and Soil Leachate Remediation Standards for the Migration to Groundwater Exposure Pathway Basis and Background. The 0.43 is an EPA default value.

Contaminated zone field capacity 0.18 Value based on sitespecific soil type (sand);

calculated using equation in NUREG/CR-7267 0.23 NJDEP Default water filled soil porosity is 0.23 - per the NJDEP May 2021 - Soil and Soil Leachate Remediation Standards for the Migration to Groundwater Exposure Pathway Basis and Background Hydraulic Conductivity (m/y) 2741 2017 Hydrogeologic Investigation Report (Cape May K Value) 2595 The GHD number provided is the K Value for the Cohansey, where the majority of the contaminated zone is found. However, the use of the Cape May K Value is more conservative Contaminated zone b parameter 0.975 NUREG/CR-7267 distribution for site soil type - sand No Value Calculated by GHD Saturated Zone Thickness (m) 9.6 Portion of RB wall below the water table 10.01 The GHD number provided is based on using the 2021/2022 DTW average of 13.2 feet.

Density of saturated zone (g/cm3) 1.5105 Site soil type = sand (2017 Hydrogeologic Investigation Report). Input for density of fill material = NUREG/CR-7267 density distribution for site soil type - sand.

1.5 Consistent with NJDEP assumptions (1.5 g/cm3) for generic loamy sand soil (See USDA Soil Triangle) NJDEP default Soil Type is Sandy Loam Contaminated Zone Saturated Zone

Table 5.1 - ResRad Model and Site Hydrogeologic Parameters Hydrogeologic Parameter RESRAD Model Value Basis RESRAD Input Site-Specific Value Notes Saturated Zone Total Porosity 0.43 NUREG/CR-7267 distribution for site soil type -sand 0.41 NJDEP default total Porosity is 0.41. - per the NJDEP May 2021 - Soil and Soil Leachate Remediation Standards for the Migration to Groundwater Exposure Pathway Basis and Background The 0.43 is an EPA default value.

Saturated Zone Effective Porosity 0.25 2017 Hydrogeologic Investigation Report 0.25 NJDEP default effective porosity for sandy loam for use in the SESOIL model Saturated Zone Field Capacity 0.18 Value based on sitespecific soil type (sand);

calculated using equation in NUREG/CR-7267 0.23 NJDEP Default water filled soil porosity is 0.23 - per the NJDEP May 2021 - Soil and Soil Leachate Remediation Standards for the Migration to Groundwater Exposure Pathway Basis and Background Saturated Zone Hydraulic Conductivity (m/y) 2741 2017 Hydrogeologic Investigation Report (This is the Cape May K Value) 2595 The GHD number provided is the K Value for the Cohansey, where the majority of the contaminated zone is found. However, the use of the Cape May K Value is more conservative Saturated Zone Horizontal Hydraulic Gradient (ft/ft) 0.025 2017 Hydrogeologic Investigation Report (based on 25th percentile of 0.01 to 0.04 range given in HIR; these are Cape May values) 0.004 - 0.009 The GHD number provided is the hydraulic gradient of Cohansey wells. However, the use of the Cape May hydraulic gradient value is more conservative Avg. Linear GW Flow Velocity (ft/yr) 100 - 550 The GHD number provied is the GW flow velocity for the the Cohansey Aquifer per the 2022 Hydraulic Investigation Rerpot Unsaturated Zone Thickness (m) 3.5 3.1 The GHD number provided is based on using the 2021/2022 DTW average.

Density of unsaturated zone (g/cm3) 1.5105 Site soil type = sand (2017 Hydrogeologic Investigation Report). Input for density of fill material = NUREG/CR-7267 density distribution for site soil type - sand.

1.5 Consistent with NJDEP assumptions (1.5 g/cm3) for generic loamy sand soil (See USDA Soil Triangle) NJDEP default Soil Type is Sandy Loam Unsaturated Zone Total Porosity 0.43 NUREG/CR-7267 distribution for site soil type -sand 0.41 NJDEP default total Porosity is 0.41. - per the NJDEP May 2021 - Soil and Soil Leachate Remediation Standards for the Migration to Groundwater Exposure Pathway Basis and Background The 0.43 is an EPA default value.

Unsaturated Zone Effective Porosity 0.25 2017 Hydrogeologic Investigation Report 0.25 NJDEP default effective porosity for sandy loam for use in the SESOIL model Unsaturated zone field capacity 0.18 Value based on sitespecific soil type (sand);

calculated using equation in NUREG/CR-7267 0.23 NJDEP Default water filled soil porosity is 0.23 - per the NJDEP May 2021 - Soil and Soil Leachate Remediation Standards for the Migration to Groundwater Exposure Pathway Basis and Background Unsaturated Hydraulic Conductivity (m/y) 2741 2017 Hydrogeologic Investigation Report (This is the Cape May K Value) 2739 Consistent with what was used in RESRAD. Calculated from 2017 and 2022 Hydraulic Investigation Report; Small difference is likely from unit conversion Horizontal Hydraulic Gradient (ft/ft) 0.01 - 0.04 These are gradient in the Cape May Aquifer per HIR 2022; hydraulic gradient is not an input in RESRAD for Un-saturated zone Avg. Linear GW Flow Velocity (ft/yr) 300 - 1800 These are in the Cape May Aquifer per HIR 2022; GW flow velocity is not an input in RESRAD for Un-saturated zone Unsaturated zone b parameter 0.975 NUREG/CR-7267 distribution for site soil type - sand No Value Calculated by GHD Soil type from boring logs includes silty sand.

In RESRAD Model unsat zone is clean unsaturated zone between the RAD contamination and the water table. At this site, there is no unsat zone CSM - clean cover; unsat contaminated; unsat clean, then water table Unsaturated Zone

GHD l Holtec Decommissioning International l 11197486 l Hydrogeologic Investigation Report-Addendum 9 ghd.com The Power of Commitment