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CE" SITE REPW DIABLO CANYON
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PREPARED BY PACIFIC GAS AND ELECTRIC CCEPANY
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8708110212 870729 PDR FOIA CONNORB7-214 PDR e
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INTRODUCTION 1
II SITE AND ENVIRONS 2
III METER OIDGY 6
IV GEOLOGY 10 V
SEISMOIDGY 13 j
VI HYIROLOGY 15 l
VII CONCLUSIONS 17 l
l APPENDIX 1 USGS MAP " SAN LUIS OBISP0" l
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APPENDIX 2 PACIPIC GAS AND ELECIRIC COMPANY' METEOROIDGY OFPICE REPGLT ON DIABLO CANYON SITE t
APPENDIX 3 PACIFIC CAS AND ELECIRIC COMPWY DEPARTMENT OF ENGINEERING RESEARCH REPORT No. 5326-65:
DIABLO CANYON NUCLEAR PIANT SITE, PRELIMINARY GEOLCCIC INVESTIGATIONS APPENDIX 4 REPORTS OP IR. R. H. JAHNS, CONSULTING GE0IDGIST APPENDIX 5 GEOLOGIC MAP OF CALIPORNIA SAN LUIS OBISPO SEEET, 1958 APPENDIX 6 GEOLOGIC EXPLGLATION IRENCHES
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I - INTRODUCTION i
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The following information is presented as a summary of preliminary
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studies on the ef te and environs of a proposed nuclear power plant for 1
pacific Gas and Electric Company in the vicinity of Diablo Canyon, San Luis Obispo County, California.
This summary has a threefold purpose:
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- 1) To evaluate the suitability of Diablo Canyon as a site for a 1
nuclear powcr plant.
- 2) To summarize the data presently available in order to establish a more exhaustive and comprehensive site investigation.
- 3) To establish preliminary site-influenced design and operating i
criteria.
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A summary of preliminary findings relating to these goals is presented as a conclusion in Section VII of this report.
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The information presented herein has been gathered from public records, recognized authorities, consultants, and Company specialists in the research and design fields.
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II - SITE AND ENVIRONS 1
A.
Location and Area l
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The Diablo Canyon site is located adjacent to the Pacific Ocean in San Luis Obispo County, California, approximately 190 miles south of San l
Francisco and 150 miles north of Los Angeles.
The site lies twelve miles
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l vest southwest of the City of San Luis Obispo, the county seat. Figure II-1 shows the location of the proposed site. Figure II-2 shows the area up to i
sixty miler adjacent to Diablo Canyon.
The area within a six-mile radius of the site is shown in Figure II-3.
A copy of the USGS map " San Luis Obispo" l
1s included as Appendix 1.
The site contains approximately 535 acres south of Diablo Canyon Creek which are leased to the Company for a term of 99 years with an option to renew for an additional 99 years.,0ne hundred to two hundred additional acres will be acquired on the north side of Diablo Canyon Creek. The site boundaries and the estimated plant location are illustrated in Figure II-4.
The site is situated on a sloping terrace, 60 to 150 feet above sea level, bordered by the Pacific Ocean on the southwest and the San Luis Mountains on the northeast.
B.
Access The site is accessible from the town of Avila Beach by an unimproved, privately-owned road. A similar road approaches the site from the north-The nearest public routes are county roads located in Clark Valley, west.
four miles north, and See Canyon, five miles east.
U. S. Route 101 is the main highway serving the coastal region.
Its nearest point lies about ten miles to the east of Diablo Canyon, separated I.. _ _ -
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1 from it by the San Luis Mountains. State Route 1, ten miles to the north, i
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carries moderate traf fic between San Luis Obispo and the coast..
There are no deep water dock facilities within sixty miles of the
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site. Small craft harbors are located at Morro Bay and San Luis Obispo Bay.
The Southern Pacific Company operates the nearest railroad which approximately parallels U. S. Route 101. Construction of a spur track to 1
the site is not contemplated; however, a new access road will be built from the existing Point San Luis Road at Avila Beach to the site prior to plant construction.
C.
Population l
The portion of California within a sixty-mile radius of the site j
is rather sparsely populated. Although the site is approximately centered in San Luis Obispo County, a sixty-mile radius also encompasses portions of
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Monterey and Santa Barbara Counties. 1he population of this area has grown approximately 25 percent in the period 19o0 to 1965. This growth rate has been typical of the State as a whole. Table II-l shows population trends of
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i the three counties and the State of California. Table II-2 shows the growth l
l of the largest communities within sixty miles of the site during the past five years.
No communities are located inside a six-mile radius of the proposed site. The nearest residence is 1-1/2 miles north. Most of the communities are located adjacent to U. S. Route 101 with the majority centered in the Santa Maria Valley.
There are only three cities of more than 10,000 people within sixty miles of the site; these are San Luis Obispo (25,750), Santa Maria (31,200), and Lompoc (14,415). Table II-3 shows the distribution of (
coasmnities around the site and their population as reported in the 1960 -
census.
The population.does not vary much with the season; however, there' is an occasional weekend influx of people in the vicinity of Grover City 1
and Morro Bay. The lands adjacent to the coastline for eight miles in both directions. from Diablo Canyon are privately held and have not been open to the public.
The owner of the coastal property extending southeasterly from Diablo Canyon to Avila Beach has indicated plans for' low-density residential
.and recreational development.
D.
Land Use The San Luis Mountains dominate the general area. The economy is primarily dependent on agriculture. The terrain east of U. S. Route 101 is
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a relatively uninhabited and inaccessible mountainous region, a large portion of which is included in the Los Padres National Forest. West of Route 101, I
l the upland country is used primarily for grazing beef and, to a lesser extent, i
dairy cattle.
Farming is the predominant activity in the San Luis and Santa Maria l
Valleys. Major products are fruits, grain, sugar beets and truck crops.
l Approximately 19 percent of the total employment and 29 percent of the total income of the area is agriculture.
Industry is small and of a local nature serving the agricultural needs of the area. Food processing and the production and refining of crude oil are major industries of the regf.on, although the numbers employed are not large. Commercial and sport fishing are important industries in the areas of Morro Bay and Port San Luis. Tourism also contributes to the economic pattern. - _-_
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The largest industrial complex is Vandenberg Air Force Base located I
thirty-seven miles southcast of the site. The U. S. Army maintains Camp Roberts and the Hunter-Liggett Military Reservation approximately forty miles north of the site. These bases account for the area's high proportion of employment in Gosernment.
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TABLE II-1 POPUIATION TRENDS OF THE STATE AND 000NTIES SURROUNDING DIABID CANYON counties San Luis
.Sants Year Monterey Obispo-Barbara State of California 1940 73,032 33,246 70,555
'6,907,387-Note 1 1950 130,498 51,417 98,220 10,586,223 Note 1 1955 161,400
.63,100 110,200 13,004,000 Note 2 1960 193,753 81,044 168,962 15,717,204 Note 1 l
1965 221,600 100,500 243,900 18,726,000 Note 2 1970 276,800 127,900 334,800 21,734,000
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1975 331,000 152,400 410,300 24,830,000 Note 3 1980 396,600 178,600 491,300..
23,137,000 Note 3 j
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Notes:
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U. S. Bureau of the Census Figures I
2.
State of California Department of Finance Estimates.
3.
State of California Department of Finance Projections, Special Report of February 15,1%3
TABLE II-2 GROWTH OF COMMUNITIES OVER 1,000 POPU1.'. TION WITHIN SIXTY MILES OF DIABID CANYON Population Community 1960 1965 Percent Increase Arroyo Grande 3,291 6,862 108.5 Atascadero 5,983 11,500*
94.5 Cambria Not Available-1,570*
Cayucos Not Available 1,964*
Grover City 5,210 5,975 14.7 Guadalupe
-2,614 Not Available i
1 Lompoc 14,415 23,998 e6.5 l
Morro Bay 3,692 o,960 88.7 1
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Orcutt 1,414 Not Available Paso Robles 6,b77 7,375 10.5 Pismo Beach 1,762 2,000 13.5 Oceano 1,317 1,664 25.3 i
l Santa Maria 20,027 31,200 55.3 San Luis Obispo 20,437 25,750 26.0 Shell Beach 1,320 2,100 13.7 Solvang 1,325 Not Available l
1960 population figures from U. S. Bureau of the Census 1965 population figures from California State Department of Finance and.
local Chamber of Commerce estimates.
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Estimates of California State Division of Highways for January, 1963.
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TAhLE II-3 POPULATION OF CCHMUNITIES WITHIN A SIXTY-MILE RADIUS. OF DIABID CANYON SITE Airline Distance Community County Population (miles)
D,irection l
Harmony San Luis Obispo Less than 250 22 NNW l
Cambria San Luis Obispo 2000 28 NNW Cambria Pines San Luis Obispo Less than 250 29 NNW San S'imeon San Luis Obispo Less than 250 36 NNW Bryson Monterey Less than 250 45 NNW Lockwood Monterey Less than 250 53 NNW Jolon Monterey Less than 250 56 NNW Baywood Park San Luis Obispo Less than 250 8
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Horro Bay San Luis Obispo 3,692 11 N
l Cayucos San Luis Obispo 1,700 17 N
Bradley Monterey Less than 2 50 46 N
Pleyto Monterey Less than 250 46 N
San Ardo Monterey Less than 250 56 N
Atascadero San Luis Obispo 5,983 21 NNE Templeton San Luis Obispo Lese than 1,000 24 NNE Paso Robles San Luis Obispo 6,677 30 NNE Estrella San Luis Obispo Less than 250 37 NNE Whitley Gardens San Luis Obispo Less than 250 37 NNE San Miguel San Luis Obispo Less than 1,000 39 NNE l
Parkfield Monterey Less than 250 54 NNE Santa Margarita San Luis Obispo Less than 1,000 19 NE Cushing San Luis Obispo less than 250 20 NE Creston San Luis Obispo Less than 250 28 NE Shandon San Luis Obispo Less than 1,000 40 NE Cholame San Luis Obispo Less than 250 47 NF San Luis Obispo San Luis Obispo 20,437 13 ENE Pozo San Luis Obispo Less than 250 28 ENE La Panza San Luis Obispo Less than 250 37 ENE Simmler San Luis Obispo Less than 250 49 ENE Edna San Luis Obispo Less than 250 14 E
Avila Beach San Luis Obispo Less than 250 7
ESE Shell Beach San Luis Obispo 1,820 12 ESE Pismo Beach San Luis Obispo 1,762 13 ESE Grover City San Luis Obispo 5,210 15 ESE Oceano San Luis Obispo 1,317 16 ESE Arroyo Grande San Luis Obispo 3,291 17 ESE Berros San Luis Obispo Less than 1,000 20 ESE Nipomo San Luis Obispo Less than 1,000 24 ESE Guadalupe Santa Barbara 2,614 24 SE Santa Maria Santa Barbara 20,027 29 SE Casmalla Santa Barbara less than 250 32 SE Orcutt Santa Barbara 1,414 33 SE Garcy Santa Barbara Less than 250 3B SE Sisquoc Santa Barbara Less than 250 40 SE Los Alamos Santa Barbara Less than 1,000 47 SE Bue11 ton Santa Barbara Less than 250 56 SE l(
Los Olivos Santa Barbara Less than 1,000 56 SE Solvang Santa Barbara 1,325 59 SE Santa Ynez Santa Barbara Less than 1,000 60 SE Surf Santa Barbara Less than 250 39 SSE Lompoc Santa Barbara 14,415 45 SSE
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CONTOUR MAP 6 MILE RADIUS i
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SCALE IN MILES Ro n 9//n o/n m o u
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l APPENDIX 2 -- Pacific Gas and Electric Company Meteorology Office Report on Diablo Canyon Site
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