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5 1HC . In April 1999,, at the request Resources (ADC reviewed of PHS/EHD PHS/EHD groundw ATC completed a Of the ) groundwater , ater well Construction 'survey site to identify an well construction !o nstruction Io Y for the subject survey revealed Y groundwater wells locate logs' and conducted gs, Department of Water of these fourteen wells located within a site walk in the wells is Located within a a 2,000-foot radius vicinity Survey findings approx?matel pproximately 27000 of the site. P'-Op rc� gs are summarized Y 800 feet uPgradieni of feet of the site. The c1 Test pert'at 1112 East Uardin 1n ATC's Well Surve the project site, g Way, Stockton, Cali 0., `�ndreN, The receptor Cn Apri! 11, 2000, o�nia, dated q and site, T'Ust; evaluate w a single soil pril 9, 1999. Vfar the nether groundwater boring (SB7 encountered ata had been ' ) was advanced to a borin pPraXlmately 4S feet bgs at the sub ect approximate]g using a Hydro gs and J site. y &5 ft. bgs to extent of Punch® groundwater-s a sp1e vas subse Groundwater contamination in the quently collected as initially to a total co most cost- Piing tool. In from the soil of the mPm On depth of effective M order to determine Petroleum h 66.5 ft. bgs where feld net, the soil boring was the vertical indicated that Ydrocarbons had observationsfurther adv soil and groUndwater beneath thereal)Ivc suggeSted t anent residual petroleum h Analytical results and he vertical extent groundwater a Ydrocarbon constituents location of the fo field observation, constituents PPeared to be defned. The rmer USTs were impacted characterize the or near the However vertical extent o f i mpacted by groundwater interface the lateral extent mpacted sail and September 20 extent Of f contamination nterface was of Petroleum 2000. was been r undefined. Additional hydrocarbon requested pHS/EHD ' work to On November 15 !n co further correspondence dated borings to a and 16, 2001, an monitorin ppr°Xlmately S4 0 ATC geologist supe depth g wells MWI, MW2 SS feet bgs Soil borings the mens of P of 35.5 g were then advance The soil feet bgs Contained the hMW3' The soils completed three soil samples collected from ghest concentrations of TPHected fro as groundwater only trace concentrations m boring MW2 m boring Mr2 at a from borings of TPH at depths of 30 feet ' ethyl benzene and TPH gs MWI and MW3 at (I ethyl benzene bgs and 55 feet b and xylenes. g, respective) Pths of 3S feet band/or xylenes, bgs contained feet bgs did y' The samples collected from oOntained trace he soil sample$ collected ether not contain detectable co concentrations of (TAME)' t-butanol ncentrations of borings MW1 and MW3 xylenes dichloroethane (TBA), eth Hg or BTEX at de collected from (1,2-DCA)' or 1 yl t-butyl ether (ETRE depths of 44 borings ,2-dibromaeth )� di-isopr MTBE' t-amyl methyl 1 M�V2 sample fro gs MWI, MW2 ane (EDB) were not P PYI ether {DIPS), l,2- ? m 35.5 feet b , and MW3, though the detection lin, in bgs due to the high concentrations of 'on any soil samples GROUNDV4,ATER FLOW I mits were elevated in the I�rRECT oIv g noted previously. Water level measure April 9, 2003. meats were collected fro in water table Water elevations range rn monitoring were used t elevation of a d from our 2 g Fells A4W1 o develo Pproxirnatel to since Jan, representin MW2' and MW3 on horizontal isotropicp the groundwatery eva feet since Jana g an average conditions C'levation art' 2003. ge increase Prevail, groundw Contour The water level w:1w0rd ater in the map (Figure 3), data Pr[f122493�teportsl2 uApermost a ) Assuming that C>R-03.doc quifer beneath the � site