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SITE CLOSURE REPORT <br /> General Mills, Inc, <br />• 2000 West Turner Road <br /> Lodi, California <br /> Delta Project No D092-708 <br /> Page 6 <br /> observed m the soil samples inspected Organic vapors in the soil samples were not detected with the <br /> PID The soil samples collected from 35 feet beneath the surface in bormgs MW-1, MW-2, and MW-3 <br /> were submitted to a certified laboratory for analyses of BTEX and TPH as diesel No 6 No analytes <br /> were detected at or above the laboratory's reporting limits Analytical results are presented in Table 3 <br /> The results of DeIta's subsurface investigation are presented in Delta's report dated Iune 9, 1992 <br /> In a letter dated February 17, 1993, the County requested that additional site assessment be performed <br /> at the site Delta observed the drilling of three additional soil borings {SB-1 through SB-3} within the <br /> tormer excavation Soil samples were collected at a minimum of 5 foot intervals within native material <br /> and submitted to a certified laboratory for analyses of BTEX and TPH as diesel No 6 Benzene, toluene, <br /> and total xylenes were not reported above the laboratory's limits of detection Ethylbenzene was reported <br /> in one sample at a concentration of 0 01 ppm TPH as diesel was reported at concentrations of 990 and <br /> 27 ppm in the 15 and 17 5 foot samples, respectively, collected from boring SB-1 In addition, the <br /> sample collected in backfill material at 4 feet bsg from boring SB-2 reported 410 ppm TPH as diesel <br /> All other samples were below the laboratory's limits of detection Cumulative results of soil samples <br /> analyzed from soil borings drilled at the site are presented in Table 3 <br /> Utilizing analytical results obtained during the tank removal and subsequent drilling events, the lateral <br /> and vertical distribution of TPH as diesel in soil has been assessed Figure 11 shows the inferred lateral <br /> distribution of TPH as diesel in soil remaining in place between 15 and 17 5 feet bsg Figures 7 and S <br /> show the inferred vertical distribution of TPH as diesel remaining in place in soil beneath the former <br /> tanks <br /> 3 4 Volume Calculations of Hydrocarbon Containing Soil <br /> 3 4 1 Prior To Excavation <br /> The volume of hydrocarbons released at the site beneath the former storage tanks is unknown, however <br /> an estimated volume can be obtained utilizing field and laboratory data collected during the tank removal <br /> • <br /> RPT137 SJS <br />