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' 18 November 2003 • AGE-NC Project No 95-0128 _ IPage 3 of 7 ' well, using an Oakton water analyzer The field data and field sheets are included in Appendix B Purged water was discharged Into the active ground water treatment system for disposal 2 2 2 Ground Water Sample Collection ' A water sample was collected from each monitoring well using a new disposable bailer after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume Immediately upon retrieval, the samples were transferred into three 40-milliliter (ml) EPA-approved volatile organic ' analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid(sample preservative)and one 1-liter amber bottle without the preservative The samples collected were logged on a chain-of-custody ' form,placed in a chilled container and transported to CaItech Environmental Laboratory(CTEL) a California Department of Health Services(DHS)-certified laboratory,for analysis The ground water samples were analyzed for ' • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and IPH-d) in accordance with EPA Method 8015-Modified, I • Benzene, toluene, ethyl benzene and xylene (BTE&X) in accordance with EPA 8021, and • Fuel additives di-isopropyl ether (DIPS), ethyl tertiary-butyl ether(ETBE),methyl tertiary- butyl ether(MTBE),tertiary-amyl methyl ether(TAME),tertiary butanol(TBA),methanol, ethanol, ethylene dibromide (EDB) and 1,2-diihloroethane (1,2-DCA) in accordance with EPA Method 8260B ' 3.0. F'INBINGS 3 1 ANALYTICAL RESULTS OF WATER TREATMENT SA_T\ PLES ' The ground water extraction treatment influent samples were reported by laboratory analysis as follows IIn general, the TPH-g and TPH-d concentrations in the influent samples decreased in concentration from April to August 2003, however, the concentrations increased in September 2003 TPH-g dropped from 2,400 ug/l in April to 380 ug/l in August and increased to 1,200 ug/1 in September 7PH-d dropped from a high of 570 ug/1 in May to 250 ug/l in August TPH-d showed a slight increase to 280 ug/1 in September 2003 Advanced GwEnvironmental Inc.