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i 13) I Hydrocarbon Removal and Groundwater Disposal During the groundwater pumping test approximately 1,261 gallons of groundwater was extracted Approximately 0 016 pound of TPHg, 0 0002 pound of benzene, and 0 067 pound of MtBE were removed from groundwater during the test Hydrocarbon removal data is presented in Table 7 Section 8 details the storage and disposal of the groundwater removed during this operation 8.0 SOIL AND GROUNDWATER STORAGE AND DISPOSAL Approximately 18 drums of sod and rinsate water and 7 drums of purge water from well development and groundwater sampling activities were generated and temporarily stored onsite in properly labeled DOT approved 55-gallon drums pending characterization and disposal Soil samples were collected from the soil stockpile drums and sent to Kiff Analytical for profiling Eight soil samples were collected from the drums and combined In the laboratory into two composite sample (SP-7[ABCD] and SP-8[ABCD]) and analyzed for TPHg, BTEX, and MtBE by EPA 826013, and total lead by EPA 7421 MtBE was detected at 0 17 mg/kg in SP-7 and 0 028 mg/kg in SP-8 and total lead was detected at 6 39 mg/kg in SP-7 and 7 61 mglkg in SP-8 TPHg and BTEX were not detected above laboratory reporting limits in either of the stockpile composite samples Belshire Environmental Services Inc transported the non-hazardous soil and rinsate/purge water from this site in August 2004 Eighteen drums of soil and seven drums of purge water were recycled at the TPS Technologies Soil Recycling facility located Adelanto, California (Appendix 1) The extracted groundwater generated during the pump test was temporarily stored onsite in a 6,500 gallon holding tank and hauled by Gomez Tucking and disposed of at Instrat In Rio Vista, California Groundwater disposal documentation is presented in Appendix 9.0 CONCLUSIONS ' This Site Conceptual Model was developed to summarize site activities and provide a guide for future assessment and remediation The following conclusions are based on the data from site activities described in the previous section Petroleum hydrocarbons detected in soil and groundwater during the upgrade and subsequent replacement of the USTs, product lines, and dispensers in 2003 and subsequent site investigation resulted from the operations of gasoline USTs and associated piping and dispensers at the site The majority of hydrocarbons in soil are in the area of the former USTs and dispensers to depths of approximately 20 feet bgs • A water supply well survey for the site indicated that the nearest domestic wells are approximately 850 feet to the southwest (cross-gradient) and the nearest municipal well is located approximately 1 3 miles to the east 32262 Assessment&Feasibility Report&SCM doc 13 September 30, 2004 77EL 32262 04 0502