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SECOR � - <br /> Mr. Roberti. Cochran <br /> March 11, 2003 <br /> Page 2 <br /> geometric mean of 3.4 x 10-3 cm/sec (approximately 10 feet/day). The transmissivity ranged from <br /> 420 to 3,100 gallons per day per foot(gpd/ft). <br /> On May 21, 2002, monitoring wells MW-1 through MW-3 were destroyed, in accordance with San <br /> Joaquin County requirements and Bulletin 74-90: California Well Standards, California Department of <br /> Water Resources, June 1991. <br /> PROPOSED SCOPE OF WORK <br /> The scope of work proposed for the site assessment includes the drilling of seven exploratory soil <br /> borings. Soil samples will be collected from each of the soil borings, and groundwater samples will <br /> be collected from three of the soil borings at the subject site. <br /> The specific scope of work is discussed below. <br /> Soil Borings and Groundwater Sampling <br /> Seven soil borings will be advanced at each of the locations shown on Figure 2 using 8-inch hollow- <br /> stem augers. Soil borings will be advanced a minimum of 15 feet below ground surface (bgs) <br /> adjacent to product lines and 25 feet bgs adjacent to LISTS or until two consecutive five-foot clean <br /> field samples are obtained below adjacent facilities, until groundwater is encountered or refusal is <br /> encountered. Soil samples for logging will be collected at approximately 5-foot intervals, and will be <br /> described using the Unified Soil Classification System and standard geologic techniques under the <br /> direction of a State of California Registered Geologist. Headspace monitoring will be conducted at <br /> five-foot intervals from ground surface to the total completion depth. Soil borings will be abandoned <br /> in accordance with the California Department of Water Resources Bulletin 74-90. Attachment 1 <br /> describes SECOR's Field and Laboratory Procedures. <br /> Selected soil samples from each soil boring will be submitted for analysis. Groundwater samples will <br /> be collected from three selected soil borings where groundwater is encountered using a stainless <br /> steel or disposable bailer. Groundwater is expected to be encountered at approximately 42 feet bgs, <br /> based on a review of historic boring logs. <br /> Soil Analysis <br /> Selected soil samples will be submitted to a California State certified laboratory and analyzed TPHg <br /> by EPA Method 8015M, and for BTEX and MtBE by EPA Method 8260B. The laboratory report for <br /> soil analysis will include Chain-of-custody records and documentation of the precision and accuracy <br /> of the chemical analytical methodology. <br /> Groundwater Analysis <br /> Groundwater samples collected from selected borings will be submitted to a California State certified <br /> laboratory and analyzed TPHg by EPA Method 8015M, and for BTEX and MtBE by EPA Method <br /> 82608. The laboratory report for soil analysis will include Chain-of-custody records and <br /> documentation of the precision and accuracy of the chemical analytical methodology. <br /> I:1Chevront2007641Reports'200704 Work Plan for Site Assessment 2003.doc <br />