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SOIL MANAGEMENT PLAN FOR TANK REPLACEMENT <br /> 620 West Charter Way, Stockton, CaVorma <br /> Delta Project No 40-88-586 <br /> Page 2 <br /> • Collection of one soil sample in each corner of the east side of the excavation (soil boring <br /> samples provide definition of the hydrocarbon concentrations present on the west side of the <br /> planned excavation as presented in Section 12) <br /> • Stockpiling of soils on site until laboratory analyses characterize the petroleum concentrations <br />' present in these soils Collection of one composite soil sample from the stockpiled soil to <br /> determine the average hydrocarbon concentrations in the stockpile <br />' 0 Submittal of three soil samples to the on-site mobile laboratory for analysis of total purgeable <br /> hydrocarbons (TPH), and benzene, toluene, ethylbenzene, and xylenes (BTEX), by U S <br /> Environmental Protection Agency (EPA) Method 8015 modified and 5020, respectively <br />' 0 Installation of new tanks and (if soils on the east side of the excavation are found to contain <br /> greater than 100 ppm TPH) two 12-inch-diameter surface casings located between the tanks (in <br /> order to allow future access as needed for remediation) and backfilling of the excavation with <br /> clean, imported fill material <br />' Based on results of soil analyses, disposal of stockpiled soil at an appropriate landfill facility <br /> �C ys F P <br /> • Excavation and removal of existing tanks (including a 550-gallon waste oil tank) and product <br />' lines Approximately 725 yards of soil will be derived from these excavations <br /> • Over-excavation of tank pit and product line trenches, as necessary, to a maximum of <br />' approximately 2 to 3 feet in any one direction The maximum extent of excavation will be <br /> determined in the field by a Delta geologist or engineer <br /> a Segregation of soils based on the results of screening with a PID <br />' 0 Collection of six soil samples within the former tank excavation and one sample within the waste <br /> oil tank basin as required in Table 1 of the Tn-Regional Recommendations for Irutial Evaluation <br /> and Investigation of Underground Tanks (Tri-Regional Recommendations) <br />