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EXECUTIVE SUMMARY groundwater, possible Sensitiue receptors nes were to further define the th es to and survey pil si g storing wells The project objectives ca ability at groundwater mon establish a groundwater monitoring capa- three on-site g he site vicinity To achieve these possible sensitive receptors wyvras phin roper rly d posedte m t were installed, and p tM11N-1, 2 and 3} generated duiing the project were surveyed Waste Solt and water g rade mostly consisted of clay, Served to the total drilling depth of 35 feet below street g rade b of Weil-sorted sand were not observed l 9 0 feet belowgrade was Salts o s at approx+mate y slit and fine Sand mixtures Intervals well boring depth to the groundwater table, ranged first encountered to the three monitoring The static dep The resulting roxirnately 3()feet below street grade)to 26 38 fleet below street grade in Mt a gradient of f �apA rade in MW- lane dipping to the northeast ata g from 14 35 feet below grade as a regi-star p } groundwater surface app approximately 0 ()076 foot/foot l gasoline hydrocarbons The -1 contained 1,800 miltigramS per kilogram (mg/kg) of two samples contained detectable cvncentratrons of S of ethylbenzene, and In soil, only 31 mglkg soil sample collected at 15 feet from M 43 mg/kg of toluene, 1 only contained 0 026 asollne, 2 2 mg/kg of benzene, TPH-as-g le collected at 20 feet from MW-1 and 1,2_pCA were not 150 mg/kg of xylenes The soil samele of xylenes The five oxygenates ears to be limited to mgfkg of ethylbenxene and () 012 Trig a erally, the extent of impactd impacted apAears to be f detected in any of the soil JST System samples Vertically, the extent of the vicinity of the f r app oxrmately 20 feet bgs ns Of def to a depth collected from MW-1 contained detectable con�eof TPH aS- the sntratio ample c er liter (010 1I of In groundwater, only le contained 27,000 microgr 1 of ethylberizene, 5,200 149 11 hydrocarbons This same /i of toluene, 1,600 p9 it of benzene, 4,300 µg gradient by rd line, 1,800 µ9 n that the groundwater flow drr pctbi� defined down IteIowa Baso fl of MTBE Give ears xylenes and 45 µg roundwater app the northeast, the lateral extent of impacted g None of these MW-2 and MW'3 letion reports were on file at DW 1 site vicinity, seven water wet 4 comp ears to be connected to California Water Service, For the The site vicinity is almost a st ar tirelother wells were found The entire site vicinity appears No schools, hosA none of its water supptY'Netts exist with�vethe nment buildings he nearest school to the site and no and city and county g 2,1170 feet commercial Property, tors were observed in the site vicinity T approximately possible sense the Trnity Lutheran School wat 4 American d to tie sites Mc eod Lake at Weber appears to beurface northeast of theate8 000 fe The rt west of the site he three monitoring point, approximately elusions, Ramage Environmental recammen firrn asoliine concentrations and eve Based on these con r a quarterly basis to CO arterly groundwater monitoring wells be monitored and sampled groundwater flow and gradient characteristics The first q is scheduled for October 200