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i <br /> 03 July 1997 <br /> AGE-NC Project No 95-0130 <br /> Page 6 of 9 <br />' 8-inch diameter hollow stem augers Hollow stem augers will be cleaned prior to advancement in each <br /> borehole The IAS injection points will be advanced to depths of approximately 60 feet bsg The IAS <br /> injection points will be completed with 1-inch diameter PVC casing emplaced through the hollow <br /> stem augers, utilizing five feet of screen from 55 to 60 feet bsg A 43 Lonestar Lapis Luster sand will <br /> be poured down the annulus between the well casing and the inner wall of the hollow stem auger The <br /> falter pack will be placed adjacent to the screen(0 020 inch screen size) from the bottom of the boring <br /> I to a point approximately 2 feet above the top of the screen A five foot interval of bentonite will be <br /> placed above the filter pack and will serve as an annular seal Portland Type 11 cement will be utilized <br /> to grout from the annular seal to surface grade Proposed IAS injection point construction diagrams <br />' are included as Figures 9 - Pi oposed A7r Spaiging Point Design <br />' 3 2 2 PROPOSED IN-SITU AIR SPARGING SYSTEM LOCATION AND DESIGN <br /> The IAS compressor will operate independently from the SVE unit This will allow for control of the <br />' air flow to the sparge points and "surging" of the IAS system, if necessary, to prevent mounding <br /> and/or migration of the dissolved hydrocarbons A separate electrical source and meter will be <br /> necessary for the IAS system <br /> A 1-inch diameter PVC pipe will carry air from the blower to the IAS injection points The PVC <br />' piping will be installed beneath the ground surface A plan of the proposed piping system is depicted <br /> in Figure 7 <br />' 3 2 3 PROPOSED MONITORING ACTIVITIES <br />' Quarterly ground water monitoring and sampling is proposed throughout the remediation period <br /> However, we recommend monthly measurements of ground water depth and dissolved oxygen in <br /> monitoring wells at the site on a monthly basis to determine if ground water mounding is occurring <br />' as a result of the operation of the IAS system <br /> 3 3 PERMITTING <br /> An application for a site specific permit will be submitted to the San Joaquin Valley Air Pollution <br />' Control District (SJVAPCD) prior to initiation of the remediation project In addition, proper building <br /> permits will be obtained from the City of Stockton Building Department for necessary construction <br /> work, including natural gas and electrical source installations <br /> 1 <br />