ARCHIVED REPORTS XR0006109 - Laserfiche WebLink

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lined soil storage area was constructed In the southeast corner a fluid collection sump 46 was installed The lined storage area sloped to the collection sump, which was placed on top of the plastic liner and witlun the 2-3 inch thick sand placed on top of the plastic liner to act as fluid delivery to the sump An estimated 750 cubic yards (accounting for an anticipated 20% fluff factor of the calculated excavated 639 yards) of gasoline contaminated soil was stockpiled within this soil storage area This soil was then covered with plastic liner to prevent the release of hydrocarbon vapors and to prevent fluid entry from recent storms Twelve soil samples were obtained from the stockpiled soil and submitted to Kiff Analytical Laboratory (DHS##2236), whom composited the samples into three for analysis as TPH gasoline, Benzene, Toluene, Ethylbenzene and Xylenes using EPA Method 8260B and analysis as total lead using EPA Method 6010B The results showed composite soil sample SP A-B-C-D contained 2000 mg/Kg TPHg, 0 53 mg/Kg Benzene, 12 mg/Kg Toluene, 8 1 mg/Kg Ethylbenzene, 120 mg/Kg Xylenes and 114 mg/Kg total Lead Sample SP E-F-G-J contained 280 mg/Kg TPHg, <0 05 mg/Kg Benzene, 0 32 mg/Kg Toluene, 0 16 mg/Kg Ethylbenzene, 15 mg/Kg Xylenes and 12 7 mg/Kg total Lead Sample SP H-I-K-L contained 2500 mg/Kg TPHg, <0 05 mg(Kg Benzene, 3 5 mg/Kg Toluene, 4 0 mg/Kg Ethylbenzene, 150 mg/Kg Xylenes and 16 3 mg/Kg total Lead The above results indicate that this soil can be off Hauled and disposed as non hazardous waste to a Class II designated landfill EXCAVATED CONTAMINATED SOILS DISPOSAL Western Geo-Engineers is obtaining pricing for loading, hauling and disposal of this soil, which will be submitted to the UST Fund for pre-approval of costs RECONMENDATIONS 1) Install a groundwater monitoring well within the over-excavated area to document the progress that contaminated soil removal has had on the remediation of the site And to evaluate if further remediation of the soils and groundwater will be necessary, see Figure 8 2) Install an A and B zone cluster well north of the pre-existing MW 1 location to document the progress/effects that contaminated soil removal has had on the remediation of the site And to evaluate if further remediation of the soils and groundwater will be necessary, see Figure 8 3) Install an A and B zone cluster well west of probe hole P-9 to evaluate the lateral extent of the groundwater plume in the A and B zones, see Figure 8 4) Develop a workplan for the well installations once San Joaquin County has approved the above recommendations I 11 Update Status March 2003