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May 2001 Quarterly Ground Water Monitoring <br /> 1645 Cherokee Lane,Stockton,CA <br />' Hydro-Environmental Technologies,Inc <br /> Table 1: Ground Water Table Measurements <br /> Central California Traction Company,Stockton CA <br />' Monitoring Top of Monitoring Depth to GW Table Temp. pH Conductivity <br /> Well No Casing Date GW Elevation (°F) (units) (µS/cm) <br /> Elevation (ft) (ft AMSL) <br />' (ft AMSL) <br /> MW-1 1794 5/1/2001 4361 -2567 676 5 15 1195 <br />' MW-2 1835 5/1/2001 4400 -2565 686 6 15 11 66 <br /> MW-3 1865 5/1/2001 4429 -2564 669 501 1140 <br />' Rmsate water and purged ground water were placed in 55-gallon drums north of the north building, in a <br /> secured area <br />' 2.2.1 Ground Water Table Measurements <br /> Based on the current monitoring well installation investigation, ground water in the unconfined to semi- <br /> confined zone ranged from approximately —25 67 feet above mean sea level (AMSL) to —25 64 feet <br /> AMSL Ground water was calculated with flow to the northeast at a gradient of 0 0005 feet per foot <br /> 2.3 Ground Water Sample Analyses <br />' Ground water samples were transported in an ice chest with bagged ice using proper chain-of-custody <br /> procedures to ChromaLab, a California DHS accredited laboratory Samples were analyzed for TPH as <br /> gasoline by USEPA Method 8015M, BTEX and MTBE compounds were analyzed by USEPA Method <br />' 8020, and five fuel oxygenates, 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) by USEPA <br /> Method 8260 <br />' TPH as diesel was detected at 60 ppb in MW-1 and at 89 ppb in MW-3 No detectable concentrations of <br /> TPH as diesel was found in MW-2 No detectable concentrations of TPH as gasoline, BTEX, or the five <br /> fuel oxygenates, 1,2-DCA and EDB were found in the ground water samples submitted for analysis <br />' Certified laboratory data sheets and chain of custody forms are included in Appendix B <br /> 3 <br />