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Closure Report 18 <br /> Golden Grain Manteca Bean Facility,299 Moffat Boulevard,Manteca,California July 16, 19% <br /> ■ The maximum dissolved benzene concentration was detected in well MW-7 at 780µg/L <br /> ' ■ The extent of the dissolved TPH-g and benzene plumes are defined in all directions and <br /> do not extend beyond the property boundaries as illustrated on figures 17 and 22 <br /> ■ Estimated mass in remaining groundwater is 4 pounds <br /> ' 44 Overall Summary of Baseline and Existing Site Conditions <br /> Presented in the table below is a comparison of the baseline site conditions to the current site <br /> conditions This comparison is made to summarize the changes in site conditions over the duration of <br /> the project <br /> Technical Basis Baseline Site Current Site Conditions <br /> ' Conditions <br /> Estimated Hydrocarbon Mass in Soil 3,000 lbs Not quantiSable <br /> Estimated Hydrocarbon Mass in 145 lbs-1988 4 lbs <br /> Groundwater 35 lbs- 1990 <br /> Mass and Extent of Free-Phase Maximum thickness Not detected as of 1991 <br /> ' Hydrocarbons measured in <br /> MW-2 at 2 97 feet <br /> ' Vertical Extent of Impacted Soil Base of former tank Vadose zone soils <br /> location {app 15-ft}to remediated <br /> water table <br /> ' Lateral Extent of Impacted Soil Approximate 90-ft radius Limited zone coinciding with <br /> around former tank current dissolved-phase <br /> location groundwater plume <br /> ' Vertcal and Lateral Extent of Impacted Approximately 100-ft Approximate 37-ft radius <br /> Groundwater radius around former around the former tank <br /> ' tank location location <br /> Maximum TPH-g and Benzene 1,400 ppm-TPH-g 220 ppm-TPH-g <br /> Concentrations in soil 95 ppm -benzene 38 ppm-benzene <br /> ' Maximum TPH-g and Benzene 200,000 ppb-TPH-g 6,800 ppb-TPH-g <br /> Concentrations in groundwater 18,000-ppb-benzene 780 ppb-benzene <br /> ' 42026213 CR <br /> FLUOR DANIEL GTI <br />