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v _I. <br /> r <br /> th of <br /> Petroleum hydrocarbons were <br /> e detected pert portion athepprorPrt�Ve feet at one <br /> v. <br /> _ location in the so s <br /> e Total Oil and Grease was detected at a concentration of a <br /> 2p0 ppm in soil boring MW-3• <br /> Groundwater Investigation <br /> permeability clays and silty clays, with typical hydraulic <br /> LOW p between 10-9 cm/sec and 10- cm/sec comprise <br /> F <br /> conductivities ranging <br /> the aquifer mateii-o theBadnorth-northeast at a hydraulicoundwater elevation gradient <br /> groundwater flows o <br /> of 0.0027 ft/ft. <br /> Petroleum hydrocarbons were detected in groundwater samples A <br /> collected from monitoring wells MW-1 and Mw-2 at the following <br /> concentrations: <br /> "BTEK constituents Toluene and Total Xylenes were detected <br /> roundwater sample collected from MW-1 at s, <br /> in a g b and .2.9 ppb, respectively. <br /> concentrations of 6.0 PF <br /> ` . These concentrations fall below their respective Action <br /> bevels and Maximum Contaminant Levels. <br /> a roundwater sample collected from <br /> 0 TPHg was detected in g <br /> MW-1 at a concentration of '.1540' pPb• <br /> o TPHd was detected in 'grour.`dwater samples collected from <br /> Mw-1 and MW-2 at concentrations of '380 ppb sand 160 ppb, <br /> respectively• <br /> • No Action Level rMax muM c concentrations a <br /> mit <br /> Level has been <br /> established for <br /> at a <br /> • Total Oil and Greasesams estected from MW-1 andcMWt2ation of 0.5 <br /> ppm in groundwater F <br /> • Purgeable Halocarbons and Cadmium, Chromium, Lead, Nickel, <br /> and Zinc were not detected in the groundwater samples. <br /> o Floating product was not detected in any of the groundwater <br /> monitoring wells. <br /> aminated soil <br /> The presence of elevated concentrations of ta <br /> groundwater contamination <br /> suggests that at least some o£ the <br /> detected has originated from on-site <br /> -sitdwaterce ontaminatios. Soil and n plumeamay <br />-:- _...._... data _also Indic -... --- - <br /> likely extend off-site. - - .... . . _. <br /> i. PAGE 23 <br /> j 275 GRANT LINE ROAD <br /> t� <br />