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UST Closure Report Sharpe Defense Distribution Region West Lathrop,California Page 9 Mr. Maurice Benson, an Environmental Specialist for the DDRW Sharpe Environmental department, notified CAL INC on February 10 that he had received permission from the SJVUAPCD to aerate the stockpiled materials. Stockpile SPB was moved to the site of the new stockpile south of 3rd Avenue that same day. The soil was aerated by mixing during the transfer to the site south of 3rd Avenue. The new stockpile (SPD) was 16 feet wide, about 325 feet long and 4 feet high and contained approximately 800 cy. It was laid on 30 mil-thick plastic sheeting and covered with 20 mil-thick plastic sheets. Based on analyses of 20 soil samples collected from stockpile SPD, Ms. Bassett of the CVRWQB on February 26, 1999, approved the use of the soil in stockpile SPD for backfilling the UST excavation, with exception. The part of the stockpile surrounding sample SPD-6 which contained significant concentrations of MTBE, was to be separated from the main stockpile for proper disposal (see section below). That portion was delineated with flagging by the Base Environmental departmental staff. On March 3, CAL INC removed the delineated soil around sample SPD-6 from the main stockpile with a Cat bulldozer. The removed soil was formed into a new stockpile 8 feet west of the main stockpile. The new stockpile, designated SPD-6 on Figure 7, was placed on 30-mil thick plastic sheeting and covered with 20-mil plastic. It has dimensions of 15 feet by 20 feet by 5.25 feet high and contains about 19 cy. It remains at the site. Stockpile SPC was formed on February 4,just southwest of the old truck island dispenser(Figure 5). It comprised soil excavated from around the product and vapor return piping in the area between the product dispensers and the UST excavation. The stockpile was about 5 feet wide and 30 feet long, and estimated to contain 50 cubic yards by Mr. Sasson (SJCEHD). Measurements by CAL INC suggest the stockpile comprised about 60 cy. On March 5, CAL INC received instructions from Mr. Doug Betz, USACE, to relocate stockpile SPC to a site next to the new stockpile of MTBE-contaminated soil, SPD-6. A composite sample of the soil from stockpile SPC contained low concentrations of TPH-D and MTBE. On March 8 CAL INC loaded the soil of stockpile SPC with a Volvo L120C front-end, rubber-tired loader on to rear- dump transport trucks operated by G.C.U. Trucking Inc. of Oakdale, CA. The trucks moved the soil to the new site just south of stockpile SPD. The new stockpile was placed on 3 layers of 10 mil-thick plastic sheets and cover with 2 sheets of 10-mil thick plastic, and remains there as of the date of this report. 4.0 SAMPLING AND ANALYTICAL PROGRAM This section presents a discussion of the soil sampling procedures and analytical methodologies utilized for the project. CAL INC contracted Neil O. Anderson & Associates, Inc. of Lodi, California, then later, GeoAnalytical Laboratories, Inc. of Modesto, California, as `third parties' to collect samples of soil from the tank excavation and stockpiles of excavated material. Inspectors from with the SJCEHD or the Central Valley Regional Water Quality Board (CVRWQB) directed the sampling, including sample site locations, sample method, and choice ® of analytical parameters. The procedures for sampling conducted under the direction of SJCEHD conform to those in the `Sampling Protocol for Routine Tank Removals' included with the `Permit to Close Underground Storage Tanks Storing Hazardous Materials' issued the SJCEHD. N:\PROJECTS\3546\Reports\3546 UST Closure Report Draft.doc March 24,1999