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GROUNDWATER ❑❑❑ TECHNOLOGY, INC. 4057 Port Chicago Highway Concord CA 94520(415)6712387 FAX (415)685 9148 December 15, 1992 Project No 020502819 E7 — Mr Steve Schneider San Joaquin County Public Health Services 445 N San Joaquin Street Stockton, CA 95201 E/V pR() Ivtl s 1 RE Manna Pro Facility �R �r 4 'VIcEs q 4004 S EI Dorado, Stockton, California Results of Stockpiled Soil Sampling Dear Mr Schneider This letter serves to transmit the results of laboratory analyses of stockpiled soils at the subject site The sod samples were collected on December 8, 1992 Sod samples were analyzed on site using GTEL Environmental Laboratories mobile laboratory The mobile laboratory is California certified to perform each of the following analyses that were performed ■ Total Petroleum Hydrocarbons-as-Gasoline (modified EPA Method 8015) i ■ Aromatic Gasoline Hydrocarbons (BTEX) (modified EPA Method 8020) 1 ■ Total Petroleum Hydrocarbons-as-Diesel Fuel (modified EPA Method 8015) The soil sampling was performed in accordance with the Work Plan For Characterization and Remediation of Stockpiled Sods, dated July 30, 1992, modified as requested by San Joaquin County Public Health Services (SJCPHS) Mr Steve Schneider of SJCPHS was present during a portion of the sampling activities Six piles containing sod that was excavated from the tank pit exist on the site The volume of sod in each pile varies as illustrated in Figure 1 The total volume of excavated soil in the 6 piles is approximately 4,000 cubic yards At the request of SJCPHS, a total of 50 discrete soil samples were collected from the stockpiled soil Each discrete sample represents approximately 80 cubic yards For laboratory analyses, two contiguous discrete samples were composited Each composite sample, therefore, represents a specific 160-cubic yard volume of soil Figure 1 illustrates the soil sampling locations and the division of stockpiled soils into 160-cubic yard volumes Soil sampling was conducted by first digging approximately two feet below the surface of the stockpile using a shovel at each sampling location A stainless steel sample barrel, with brass sample tubes was then driven into the stockpile approximately 1 5 feet below the hand-shoveled surface The discrete samples were given to the onsite mobile laboratory chemists to composite and to perform the analyses Samples were exchanged following standard chain of custody protocol Samples awaiting analyses were stored in a refrigerator in the mobile laboratory Offices throughout the US Canada and Overseas