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SOIL. MANAGEMENT PLAN FOR TANK REPLACEMENT 620 West Charter Way, Stockton, California Delta Protect No 40-88-586 ' Page 3 ' - Stockpiling of soils on site until laboratory analyses are completed Collection of one composite soil sample from the stockpiled soil in order to determine the average hydrocarbon ' concentrations in these soils Submittal of soil samples to the mobile laboratory for analysis of TPH and BTEX (for fuel- tank pit and product line trench samples) and for TPH, BTEX, oil and grease, chlorinated I hydrocarbons and metals (for the waste oil tank sample) as described in Table 2 of the Tri- Regional Recommendations ' 0 Based on laboratory results, disposal of stockpiled soils at an appropriate landfill facility ' 0 Backfilling of the former tank excavation and product line trenches with clean, imported backfill material Compaction of fill material to 95 percent proctor density • Preparation of a report summarizing the results of work performed, with recommendations for further action, if necessary 2.0 PREVIOUS WORK AT THE STTE ' 2.1 Soil Borings and Ground Water ' A work plan proposing soil borings to be advanced at the site (Soil Assessment Related to Removal of Underground Tanks, November 10, 1988) was submitted prior to the advancement of borings in February 1989 A subsequent report, Pretank Removal Soil Assessment dated July 3, 1989, detailed the results of the soil boring work. The most recent report submitted to the Health District is the Hydrogeolnw Assessment Work Plan, submitted August 1, 1989 On February 8, 1989, Delta advanced four soil borings at the site to evaluate the presence or absence of ' petroleum constituents in soils surrounding the existing tanks and product lines Four additional bonngs were advanced the following day in an attempt to define an area free of petroleum constituents in which the new tanks could be installed (Figure 1)