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Installing a monitoring to the East to establish the castei1y zero line for the 45- <br /> 8W sand layer. <br /> 3). Resume pump and treat, but with a 2,500gal poly tank bio-reactor to supplement the. <br /> carbon filters. <br /> 4). Perform monitoring of wells on a sena-annual basis, <br /> 5). f imit semi-annual monitoring tojust the wells screened in the second water bearin- <br /> laver: MW-1,2,33,85,10 and 11, <br /> Foothill Engineering's Predictions for the Site <br /> Augmenting the existing G.A.C. system with a bio-reactor will provide for a consurnable <br /> materials cost in line with $8.001-3 TP14g or possibly eliminate all consumahle costs. The cost <br /> G.A.C. was gone up $0.14/#. There will still he considerable costs for nionlioring the s}stem. <br /> dischar('c permits, and semi-anrulai groundwater monitoring. <br /> 4:1 <br /> As well data is collected it may be beneficial to move and deepen the extraction well to keep it in <br /> the cye of the plume. <br /> The 45-80' water bearing layer, the layer with 93.5"fo of mass remainiI1i7, has an ostimatod <br /> containinated volume of 18,766,001, (14,957,000gal). At 12gpni It will take 10 111olith"; of, <br /> C011611LIOUS PUMPing, to remove that much volume. <br /> The Engineer's Estimate to install two new wells, install the bio-reactor and operate the pump <br /> and treat system for one year is #139.300. <br /> Please contact Michael Vlach at (916) 729-5184 if YOU have any questions on this report. <br /> Res'pectfully submitted, <br /> I-oothill Engincering <br /> 0"*"7�� <br /> A <br /> C5 <br /> EX6'.12-3 <br /> Michael Vlach. PE <br /> Attachments: Exhibit A- Site Mali, Gradients, and '1'131 lo Contours, <br /> Exhibit B- Mass Remaining Calculations <br /> Exhibit C- Proposed 2,500gal Bio-Reactor <br /> cc: N41chael Sharon Olivarez, 540 W. Scotts Ave. Stockton, Ca. 95,203 <br />