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Quarte ly BeaconrstationnNo. 3- 492, Manteca, California January 31, 1989 AGS 86102-3 subjective analysis. The sFmples were collected by lowering approximately half the leng'_h of a clean Teflon bailer past the interface. The bailer was than retrieved and the water sample examined of hyfor f:-ee product evidence , emulsion, sheen, or other subjective drocarbon contamination. Approximately 0,25-inch of .free product was present in well mx-l. No free sheen, or emulsion was noted in samples from wells MW-2uor�MW-3. Cumulative results of these and previous subjective analyses are summarized in Table 1. f Ground-water mo:iitoring wells MW-2 and MW-3 were purged prior to obtaining ground-water esmples for laboratory analysis with an electric submersible pump. Because free product gas observed in well MW-1, the well was not purged or sampled. gallons of ground water were purged from well MW-2, and approximately 77 gallo,ls were purged from well WK-3. water was temporarily stored onsite in 55-gallon The purge Transportation drums, pend,ir.q removal to BeaconnsBrefinerytinf Hanford, California, and subsequent treatment in a wastewater tewater '' Recovery to the wells was relatively had recovered to static levels S'. rapid. collo After ground water lowering a clean Teflon bailer pies were collected by Point a past thy: air-water interface to a pproxima .ely 3 feet below the interface. The water was then transferZe viai.0 laboratory-cleaned, 40-milliliter glass ls. Concentrated hydrochloric acid was added as a preservative. A Chain of Custody Record was initiated by the field geologist ani accompanied the samples to Applied GeoSystems' analytical laboratory in Fremont, California. A copy of that record .is attached to this letter report. Tree ground-water samples were analyzed for total Petrole Hydrocarbons (TPH) as gasoline by modified Envi.ronmentalum Protection Agency (FPA) Method 8015 and the volatile hydrocarbon constitztents benzene, ethylbanzene, toluene, and total x}lene isomers (SETX) by EPA Method 602. Applied Ceosystema' laboratory is certified by the S•rate of California ed perforin these analyses. Copies of . laboratory Analysis Reports are attached to this .letter report. ,Th e-_results of the laboratory analyses, summarized in Table 2 indicate that the concentrations of W.TX and TPH in samples from wells MW--2 and MW-3 have decrer :ed sgnificaritly. with the exception of the benzene concentration in the sample from well MW-2, the contaminant concentrations were below the actiDn levels 2 M Y .