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, `�1• A <br /> F 1 ` <br /> t <br /> • -25 April 2000 ,� ,• 1:�' <br /> AGE-NC Project No 96-0232 <br /> t <br /> Page 2 of 4 <br /> AGE has reviewed the lithologic and analytical data derived from the ground water samples collected'during t <br /> i the CPT investigation Based onour review of the CPT data, AGE believes that installation of multi-level <br /> monitoring w ells would be a more cost effective means to monitor deeper petroleum hydrocarbon-impact <br /> rather than installation•of the originally proposed-clustered ground water monitoring wells <br /> AGE proposes to install six multilevel ground water monitoring wells on and off the site as part of the site j <br /> assessment activates Well locati6ns and screen intervals are proposed to provide definition of the vertical <br /> and lateral extent of dissolved NITBE and to monitor migration of the plume of MTBE-impacted ground <br /> water Proposed monitoring well locations are illustrated on Figure 2 <br /> Based on the MTBE-impact encotntered in the Flag City Chevron shallow ground water monitoring wells <br /> in the Rock. 's Restaurant dome5tiit drinking water well,and in the ground water samples collected from CPT <br /> soil borings, -kGE proposes multi-level ground water wells in the following locations h <br /> • MULTI-LEVEL N ELL A-Between 30 and 40 feet southwest of Flag City Chevron ground water <br /> 0� monitor-ig well MW-I td chat icterize potential contaminant migration pathways ar'd to assess' <br /> MTBE-impact immediately southwest of the site, proposed multi-level screen inter.als gill be <br /> I , ! placcc between 40 and 50 feet bsg,between 95 and 105 feet bsg and between 130 and 150 feet bsg <br /> MULII-LEVEL WELL B - Betwteeih-,10 and 270-feet east of the Rocky's Restaurant dome.,ttc <br /> dr=nl.ing water well to characterize potential contaminant migration pathways, to assess NITBE- <br /> II impact southwest of the site, and to characterize ground water at depths correspunding to the <br /> domestic drinking water well screen intervals, proposed multi-level screen intervals -AJ] be placed - <br /> betwern 40 and 50 feet bsg between 65 and 75 feet bsg, between 90 and 100 feet bsg and between <br /> 4 130 and'150 feet bsg <br /> • MULTI-LEVEL WELL C -Between 75 and 85 feet west of the Three B's domestic_drinking water <br /> I; au ell to characterize potential contaminant migration pathway s to assess the vertical and horizontal <br /> extent of MTBE-impacted ground water west of the site, proposed multi-level screen inters als will <br /> be placed between 10 and 20 feet bsg, 50 and 60 feet bsg,between 90 and 100 feet bsg and between <br /> i30,and 150 feet bsg <br /> • °MULTI-LEVEL WELL D-Between 60 and 70 feet northeast of Flag City Chevron monitoring wrell <br /> p� MW4 to characterize potential contaminant migration pathways,to assess the horizontal and vertical' <br /> D extent of MTBE-impacted ground water north of the UST area and to monitor shallow and deeper <br /> ground w ater gradient,proposed multi-level screen intervals will be placed betty ecn 40 and 50 feet' <br /> bsg,between 95 and 105 feet bsg and between 130 and 150 feet bsg <br /> • MULTI-LEVEL WELL E-Between 220 and 240 feet southeast of Flag City Chevron ground water <br /> monitoring well MW-2 to serve as sentinel wells and screen for potential MTBE-Impact to the Flag <br /> Ctryy,municipal drinking crater wells (CSA'2), proposed multi-level screen Intervals\vill be placed <br /> 1_ between 15 and 25 feet bsg between 40 and 50 feet bsg,between 65 and 75 feet bsg,between 95 and <br /> 105 feet bsg and between 130 and 150 feet bsg <br /> • MULTI-LEVEL WELL F -Between 220 and 240 feet'southwest of Flag City Chevron monitoring <br /> well to characterize potential contaminant migration pathways and to assess the vertical and <br /> IAdrancEd Ceo>:n�wonmcntal,inc <br /> 3 M , <br /> r r f w <br /> a f <br />