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2). Installing a monitoring to the East to establish the easterly zero line for the 45- <br /> 8W sand layer, <br /> 3). Resume pump and treat, but With a 2,500gal holy tank bio-reactor to supplement the <br /> carbon filters. <br /> 41). Perform monitoring of wells on a semi-alInUat basis, <br /> 5). Limit semi-annual monitoring to Just the wells serccried in the second vv-atcr bcarili,' <br /> laver: NlW-1,2,3,7,35,10 and 11. <br /> Foothill Engineering's Predictions for the Site <br /> Augmenting the existing G.A.C. system with a bio-reactor will provide f'or a consurnabic <br /> materials cost in line with $8.00/4 TPHg or possibly eliminate all consurnable cost,-;. The cost <br /> G.A.C. was gone up $0.14/#. There will still be considerable costs for nionfl-oring the s}stall. <br /> discharge permits, and semi-annual groundwater monitoring. <br /> As well data is collected it may be beneficial to move and deepen the extraction �vetl to keep it in <br /> the eye of the plume. <br /> The 45-80' water bearing layer, the layer with 93.5',`o of mass rernaininu. has an estimated <br /> contaminated volume of 18,760,001. (4,957,000gal). At l2gpn) it will take 10 inonths of <br /> COutinUOUS PL[IIII)in(-, toremove that much volume. <br /> The e'ngineer's Estimate to install two new wells, Install the bio-reactor and operate the pump <br /> and treat system for one year is#13£),30(}. <br /> please contact Michael Vlach at (916) 729-5184 if you have any questions on this report. <br /> Res'pectful1v submitted, <br /> Foothill Enginecring <br /> V C5 <br /> EYR 12w31 <br /> crVIN, <br /> \,Tichael Vlach. PE <br /> Attachments: Exhibit A- Site ?Vlap, Gradients, and 'I'PlIg Contours <br /> Exhibit B- Mass Remaining Calculations <br /> Exhibit C- proposed 2,500aal Bio-Reactor <br /> z:I <br /> cc: N41cha,,-I D. L Sharon Olivarez, 540 W. Scotts Ave. Stockton, Ca. 95203 <br />