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' Addendum to Corrective Action Plan Page 5 <br /> Former Manna Pro Site <br />' Project No 21111 <br /> August 12,2002 <br />' 3,0 VAPOR EXTRACTION & SPARGE WELL CONSTRUCTION <br />' As suggested above, installation of the remedial system will require the construction of 8 <br /> new sparge wells, and 10 vapor extraction wells The following section describes the <br /> installation of these wells (See the attached site map (Figure 2) for well locations <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 wells will be drilled with a 10 inch o d <br /> hollow stemmed auger operated by a C-57 licensed drilling contractor The vapor <br /> extraction wells will be constructed with 15-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 />' Well Boring Diameter Boring Depth <br /> 10 Vapor Extraction Wells 15 inch 50 feet <br />' 8 Air Sparge Wells 10 inch 55 feet <br /> Soil sample collection procedures are described in the original CAP <br /> 3.2 Vapor Extraction Well Construction <br /> One well, designated VEW-1, already exists as shown in Figure 3 This well will be re- <br /> designated as VEW B-2 to ft the proposed new numbering scheme as shown in Figure 2 <br /> The new vapor extraction wells will be constructed as outlined in the following table and <br /> ras more fully described in the original CAP <br /> Casing 4 inch Schedule 40 PVC <br /> Screen 0 040 inch slotted 4 inch Schedule 40 PVC <br /> Screened Interval 20-50 feet below ground surface (bgs) <br /> Filter Pack 18-50 feet bgs <br /> Filter Pack Material Pea gravel <br /> Bentonite Transition Seal 18-15 feet bgs <br /> Annular Seal 0-15 feet bgs <br /> 3.2.2 Air Sparge Well Construction <br /> The locations of the 8 new sparge wells are shown in Figure 2 The new sparge wells will <br /> be constructed as outlined in the following table and as more fully described in the <br /> original CAP <br /> 2937 Veneman Ave, 4B240 Gen-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />