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i <br /> 17 <br /> Closure Report <br /> Golden Grain Manteca Bean Facility,299 Moffat Boulevard,Manteca,California July 16,19% <br /> ' the chain-of-custody records for the water samples collected during the second quarter 1996 are <br /> ' included in appendix E <br /> 4.3 Summary of Current Site Conditions <br /> Results of the closure sod boring program conducted in April 1996 and the most recent quarterly <br /> groundwater sampling conducted in May 1996 provided data on the current extent of hydrocarbon <br /> impacted soil and groundwater at the site <br /> 4.3 1 Current Extent of Hydrocarbon Impacted Soil <br /> ' Analytical results of the soil samples collected from the ten soil conngs drilled in April 1996 indicate <br /> the following <br /> ' ■ Vadose zone sods have been remediated to nondetectable levels of TPH-g and benzene <br /> at the locations sampled (See baseline condition cross-sections, figures 4, 5 and 6 and <br /> post remediation cross-sections, figures 18, 19, and 20) <br /> ■ The sod sample collected from soil borehole C-6 at 26 feet bsg was the only sample with <br /> ' detectable concentrations of petroleum hydrocarbons This soil sample was collected <br /> from below the current water table and is indicative of residual hydrocarbon <br /> concentrations remaining in source soils <br /> ' ■ Estimated mass of hydrocarbons remaining in sod is negligible <br /> 4.22 Current Extent of Hydrocarbon Impacted Groundwater <br /> Analytical results of the groundwater samples collected from temporary wells installed in sod <br /> ' boreholes C-8, C-9, and C-10 in April 1996 and the results from the May 1996 quarterly sampling <br /> indicate the following <br /> ' ■ The maximum dissolved TPH-g concentration (34,000 ug/L)was detected in the <br /> groundwater sample collected from the temporary well installed in soil borehole C-8 <br /> ' Analytical results of TPH-g for the groundwater samples collected from temporary sod <br /> cores C-9 and C-10 were less than the method detection limit of 50,uglL Analytical <br /> results from the most recent (5121196) sampling event indicated that the maximum TPH-g <br /> ' concentration in a permanent well was in samples from MW-7 at 6,800 ug/L <br /> • <br /> t4202M13 CR <br /> FLUOR DANIEL GTI <br />