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Page 4 Pa <br /> Addendum to Corrective Action Plan � g <br /> Former Manna Pro Site <br /> Project No.2073 <br /> February 10,2009 <br /> 3.0 VAPOR EXTRACTION& SPARGE WELL CONSTRUCTION <br /> As suggested above, the work will entail the construction of one vapor extraction well <br /> and one new air sparge well. Proposed locations are shown on the attached Figure 2. <br /> 3.1 Soil Boring Installation. <br /> Additional soil borings will be installed in the area of the release and will be converted to <br /> the appropriate service wells. The new sparge well will be drilled with a S inch o.d. <br /> hollow stemmed auger operated by a C757 licensed. drilling contractor. The vapor <br /> extraction wells will be constructed with 12-inch augers. During drilling, the borings will <br /> be logged and sampled by a professional-geologist supervised by a registered geologist. <br /> The approximate depths of the borings will be as follows: <br /> r Well Bor-ing Diameter Boring Depth <br /> 1 Vapor Extraction Well 12 inch 35 feet <br /> 1 Air Sparge Well S inch 50 feet <br /> ` Soil sample collection procedures are described in the original CAP <br /> 3.2 Vapor Extraction Well Construction <br /> The new vapor extraction wells will.be constructed as outlined in the following table and <br /> as more fully described in the original CAP. <br /> Casing 4 inch Flush Joint Schedule 40 PVC <br /> Screen 0.010 inch slotted 4 inch Schedule 40 PVC <br /> Screened Interval 15-35 feet below ground surface (bgs) <br /> Filter Pack 1335 feet bgs <br /> Filter Pack Material, #3 Monterey sand <br /> Bentonite Transition Seal 13=10 feet bgs <br /> Class G Neat Annular Seal 0=10 feet bgs <br /> 3.3 Air Sparge Well Construction <br /> The new sparge .well will be constructed as outlined.in the following table and as more <br /> fully described in the original CAP. . <br /> Casing 2" Flush Joint Schedule 40 PVC <br /> Screen 0.010 Slotted Schedule 40 PVC <br /> Screened Interval 45-50 feet below ground surface (bgs) <br /> Filter Pack 43-50 feet bgs <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental.Inc. Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0295 <br /> t <br />