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Corrective Action Plan Page 8 <br /> Former Manna Pro Site <br /> IProject No 207 3 <br /> • February 16,2001 <br /> 3.0 PILOT SYSTEM WELL INSTALLATION <br /> As suggested above, installation of the remedial system will require the construction of <br /> Ione new sparge well for the first phase, and 9 vapor extraction, and 8 sparge wells for the <br /> second phase The following section describes the installation of these wells (See the <br /> Iattached site map (Figure 3) for well locations) <br /> 3.1 Soil Boring Installation <br /> Initially, one additional soil boring will be installed in the area of the release These will <br /> be drilled with a 10 inch o d hollow stemmed auger operated by a C-57 licensed drilling <br /> I contractor Pursuant to the completion of the second phase of work described above, 17 <br /> additional borings will be drilled using 15 or 10 o d hollow stemmed auger During <br /> drilling, the boring will be logged and sampled by a professional geologist supervised by <br /> Ia registered geologist The approximate depths of the borings will be as follows <br /> _ Well Boring Diameter Boring Depth <br /> First Phase 1 Sparge Well 10 inch 55 feet <br /> Second Phase-9 Vapor Extraction Wells (estimated) 15 inch 50 feet <br /> Second Phase-8 Air Sparge Wells(estimated) 10 inch 55 feet <br /> i <br /> ISoil sample collection procedures are described in Section 5 1 <br />' 3.2 Remedial Well Construction <br /> The following section describes the construction of the remedial wells Locking water <br /> tight well caps will be installed on top of each well as well as traffic rated well boxes <br /> 3.2.1 Vapor Extraction Well Construction <br /> I <br /> For the first phase, one well, designated VEW-1, already exists as shown in Figure 3 <br /> Possible second phase well locations are also shown in the figure The following table <br /> describes the construction of the vapor extraction wells <br /> I <br /> Casing 4 inch Schedule 40 PVC <br /> iScreen 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 /> • <br /> i2937 Veneman Ave,#13240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />