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i Closure Report 15 Golden Grain Manteca Bean Facility,299 Moffat Boulevard,Manteca,California July 16,19% 1 One sod sample each from sod boreholes C1 through C5 and C7 through C10 and four samples from p 9 9 p ' soil bon ng C6 were submitted to the laboratory for analysis Thirteen soil samples were submitted to the laboratory for TPH-g and BTEX analysts by U S Environmental Protection Agency(EPA) Methods 8015/8020 The laboratory reported concentrations of TPH-g and BTEX were below the ' respective detection limits for all the samples with the exception of the soil sample collected from 26 feet below grade in boring C6 The laboratory reported BTEX concentrations of 3,800 micrograms per kilogram (,ug/kg), 1 1,000ug/kg, 3,500,ug/kg, and 19,000 ug/kg, respectively,were ' present in the 26-foot sample from C6 The laboratory also reported 220 milligrams per kilogram (mg/kg) of TPH-g from the same sample Results of the laboratory analysis of soil samples are summarized in table 3 Copies of the certified laboratory reports and chain-of-custody records are contained in appendix E Concentrations of BTEX and TPH-g are plotted on the geologic ' cross-sections ' 4.1.2 Chemical Analysis of Groundwater Samples Groundwater samples were collected from soil boreholes C8, C9, and C10 through temporary monitoring wells The laboratory analysis reported no concentrations of TPH-g and BTEX above the associated detection limits for the groundwater samples collected from soil boreholes C9 and C10 The laboratory reported BTEX concentrations for the groundwater samples from soil borehole C8 of ' 540 ug/L, 900 ug/L, 1,200 uglL, and 8,000 ug/L, respectively A TPH-g level of 34 milligrams per liter(mg/L) was also reported In the groundwater sample collected from soil boring C8 Results of ' the laboratory analysis of groundwater samples are summarized in tablcl_�Copies of the certified laboratory reports and chain-of-custody records are contained in appendix E 4.9.3 Soil Vapor Extraction Test ' On April 22 and 23, 1996, a soil vapor extraction test was performed to measure the induced vacuum at soil cores C4 and C8 versus the distance from the operating vapor extraction wells The soil vapor extraction system was turned on April 22, 1996, and was operated for approximately 24 ' hours On April 22 and 23, applied vacuum pressure readings at the four operational vapor extraction wells (MW-1, MW-2, MW-3, and MW-4) and induced vacuum pressure readings at C4 and ' C8 were collected to evaluate the extent of Influence of the operating wells Readings were taken using magnahelic gauges measured in inches of water vacuum ' After 24 hours of operating the sod vapor extraction system (SVES),the Induced vacuum readings at C4 and C8 were 0 60 inch and 1 05 inches of water vacuum, respectively The vapor extraction pilot 42C20213 CR FLUOR DANIEL GTI