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DCL-2011-600.Pdf Central Coastal California Seismic Imaging Project Attachment 1 ATTACHMENT 1 PACIFIC GAS and ELECTRIC COMPANY APPLICATION FOR RESOURCE LEASE, PERMIT OR OTHER ENTITLEMENT FOR USE CENTRAL COASTAL CALIFORNIA SEISMIC IMAGING PROJECT Part 1, Section A, Item1. The following PG&E personnel are the project contacts throughout the environmental analysis and permitting processes for the Central Coastal California Seismic Imaging Project (CCCSIP): Mr. Mark Krause, Director, State Agency Relations 1415 L. Street, Suite 280 Sacramento, California 95814 Phone: 916-721-5709 Fax: 916-386-6720 e-mail: [email protected] Mr. Loren Sharp, Senior Director, Technical Services Diablo Canyon Power Plant Mail Code 104/6/603 PO Box 56 Avila Beach, California 93424 Phone: 805-781-9785 Fax: 805-545-4884 e-mail: [email protected] Dr. Stuart Nishenko, Senior Seismologist, Geosciences Mail Code N4C PO Box 770000 San Francisco, California 94177 Phone: 415-973-1213 Fax: 415-973-1409 e-mail: [email protected] Sarah Gassner, Supervisor, Land-Environmental Planning and Permitting 1455 E. Shaw Avenue Fresno, California 93710 Phone: 559-263-5073 Fax: 559-263-5262 e-mail: [email protected] Part 1, Section A, Item 2. PG&E has designated following company/personnel as agents for the Offshore Seismic Imaging Project: Mr. Ray de Wit, Senior Project Manager Padre Associates, Inc. 1485 Enea Court, Bldg. G, Suite 1480 Concord, California 94520 Phone: 925-685-9441 X 21 Fax: 925-685-8401 e-mail: [email protected] Page - 1 Central Coastal California Seismic Imaging Project Attachment 1 Mr. Simon Poulter, Partner Padre Associates, Inc. 5290 Overpass Road, Suite 217 Goleta, California 93111 Phone: 805-683-1233 X 4 Fax: 805-683-3944 e-mail: [email protected] Page - 2 Central Coastal California Seismic Imaging Project Attachment 2 ATTACHMENT 2 PACIFIC GAS and ELECTRIC COMPANY APPLICATION FOR RESOURCE LEASE, PERMIT OR OTHER ENTITLEMENT FOR USE CENTRAL COASTAL CALIFORNIA SEISMIC IMAGING PROJECT DESCRIPTION Part I, Section E, Item 1. On large-scale and small-scale maps or drawings, show the location of the State land or resource, the site of the project and the surrounding area. Include such features as: roads and waterways; city and county boundaries; north arrow; scale and date. If available, also include: section, township, range and base & meridian; USGS quad sheet name(s); chain of title; legal description; Assessor’s parcel or lot numbers; and any zoning information. The proposed Central Coastal California Seismic Imaging Project (CCCSIP) will be conducted within the coastal and offshore marine waters between Cambria and San Luis Bay, offshore San Luis Obispo County, California (Figure 1.1). Page - 1 Central Coastal California Seismic Imaging Project Attachment 2 Figure 1.1 Proposed CCCSIP Survey Area Page - 2 Central Coastal California Seismic Imaging Project Attachment 2 1.0 INTRODUCTION Part I, Section E, Item 2. Describe the project, its objectives and its relation to the State land or resource. Describe the State land or resource as it exists before the project and include information on topographic, geologic and biologic features and any cultural, historic and scenic aspects. Indicate the type of land use (agricultural, residential, etc.). Describe any existing structures on the State land and any proposed use of the structures. Include photograph(s) of the location of the State land or resource, the site of the project and surrounding area, if available. The following project description was prepared by Pacific Gas and Electric Company (PG&E) in support of the proposed Offshore Central Coastal California Seismic Imaging Project (CCCSIP) located within the central area of San Luis Obispo County, California (Figure 1.1). The following provides a preliminary summary of the proposed offshore deep seismic data collection survey. 1.1 Purpose and Objectives The purpose of the proposed survey is to implement the recommendations of Assembly Bill 1632 (Blakeslee) and the recommendations from the California Public Utilities Commission [Docket No. 07-03-044] related to assessing the impact of various fault zones surrounding the Diablo Canyon Power Plant (DCPP). The proposed deep (10 to 15 kilometers [km] or 6 and 9 miles [mi]), high energy seismic survey (energy >2 kilo joule) would complement the shallow (< 1km), low energy (< 2 kilo joule) 3D seismic reflection survey that was conducted offshore DCPP by PG&E during November 2010 through January 2011. The objectives of the proposed survey are to: • Conduct deep (10 to 15 km [6 to 9 mi]) seismic reflection profiling of major geologic structures and fault zones in the vicinity of DCPP that span the thickness of the seismogenic crust in this region. • Record wide 2D or narrow 3D profiles that improve migration imaging by recording and accounting for out-of-plane energy along the profile routes. • Obtain improved deep (> 1 km [> 0.6 mi]) imaging of the Hosgri and Shoreline fault zones in the vicinity of the DCPP to constrain fault geometry. • Obtain improved (> 1km [> 0.6 mi] depth) imaging of the intersection of the Hosgri and Shoreline fault zones near Point Buchon. • Obtain improved (> 1 km [> 0.6 mi]) imaging of the intersection of the San Simeon and Hosgri fault zones near Point Estero. Page - 3 Central Coastal California Seismic Imaging Project Attachment 2 2.0 PROJECT SUMMARY 2.1 Project Location The proposed CCCSIP will be conducted within the nearshore and offshore marine waters between Cambria and San Luis Bay, offshore San Luis Obispo County, California (Figure 1.1). These profiles will cross all the major geologic units that will be imaged in the entire offshore program, providing actual measurements of ground vibration as a function of position and distance from each seismic source as it is operated within each geologic unit. At this time, the final offshore transect and nearshore geophone locations have not been determined; as such, the transect corridors identified are approximate and subject to change. It is expected that vessel support operations will be based out of either Morro Bay or Port San Luis. The following summarizes the acquisition target areas. 3D Seismic Data Acquisition Target Areas 3D program encompasses a total area of approximately 830 km2 divided between the two primary target areas, as described below and shown on Figure 1.1. CCCSIP activities, which include vessel and onshore vehicle operations and the deployment and recovery of intertidal and nearshore geophones, are proposed within the two green rectangular areas (vessel operations) and the two smaller yellow-outlined onshore areas (geophone and onshore vehicles) in Figure 1.1. The offshore (vessel) survey will be conducted in both federal and state waters and water depths within the proposed survey areas range from 0 to over 400 m (1,300 ft); the State Three-Mile Limit is the orange line in Figure 1.1. Zone 1: Cambria to Point Estero: • Area: 345 km2 (133 mi2) • Improve imaging (> 1 km) of the intersection of the Hosgri and San Simeon fault zones offshore Cambria to Point Estero Zone 2: Point Buchon to Point San Luis • Area: 484 km2 (187 mi2) Zone 2 incorporates two target areas near Point Buchon and Point San Luis (Zones 2a and 2b) that will be imaged concurrently to minimize mobilization and maximize vessel use time. • The Point Buchon area (Zone 2a, area 108 km2) is identified to improve imaging (> 1 km [0.6 mi]) of the intersection of the Hosgri and Shoreline fault zones offshore Point Buchon. • Proposed high energy seismic survey (HESS) in Zone 2a would complement the low energy, shallow 3D seismic reflection survey conducted offshore DCPP by PG&E during the November 2010 through January 2011 period. • Proposed HESS would also be used to refine data collected east of the Hosgri fault during the 1988 Long Term Seismic Program and to provide active sources for the onshore 2D seismic program. Page - 4 Central Coastal California Seismic Imaging Project Attachment 2 • The Point San Luis area (Zone 2b, area 117 km2 [45 mi2]) is identified to determine the southern boundary of the Shoreline fault zone as well as the geometry of offshore fault systems including the Hosgri, Shoreline, Southwest Boundary Zone (Rattlesnake, Olsen), and Pecho faults. 2.2 Project Activities The proposed activities comprise both in-water and nearshore actions. The offshore components consist of operating a geophysical vessel and support/monitoring vessels within the areas shown in Figure 1.1 and transiting between the site and either Port San Luis or Morro Bay. The geophysical vessel will tow a series of sound-generating air guns and sound-recording hydrophones along pre-determined shore-parallel and shore-perpendicular transects. The nearshore actions include the placement of geophones (e.g. Fairfield Z700 nodal units) through the intertidal zone and into shallow water areas (to approximately the 30 m [100 ft] isobath) and the generation of an onshore sound source that will be recorded by the geophones. Detailed descriptions of the proposed actions for each component are provided below. Offshore Survey Operations The proposed offshore seismic survey will be conducted with geophysical vessels specifically designed and built to conduct such surveys. The following outlines the general specifications for the geophysical survey vessel and the support vessels needed to complete the offshore survey: In water depths from 30 to 305 m (100 to >1,000 ft), 6 to 12, 4.0 to 8.0 km-long (2.5 to 5.0 mi) streamers will be towed behind the primary survey vessel. The streamers will contain hydrophones placed at 2 to 30 m (6 to 100 ft) intervals to maximize efficiency and minimize the number of source points while achieving overall project objectives. • Primary vessel (60 to 100 m [200 to 305 ft] length): suited for work in shallow waters and obstructed areas, outfitted to deploy/retrieve hydrophone streamers and airgun arrays, air compressors for the airgun array, and survey recording and processing facilities (Figure 2.1).
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