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11 August 1997 <br /> AGE-NC Project No. 95-0118 <br /> Page 6 of 9 <br /> Soil borings will be completed as 2-inch diameter IAS wells using 2 feet of 0.020-inch screened <br /> PVC casing from 43 to 45 feet bsg. Lonestar#3 sand will be utilized as a filter pack in and slightly <br /> above the screened interval. A four foot interval of bentonite will be placed above the filter pack and <br /> will serve as an annular seal. Portland cement will be utilized to grout from the annular seal to <br /> surface grade. The proposed IAS injection well construction diagram is included as Figures 5 - <br /> Proposed Air Sparging Well Design. <br /> 3.2.2. PROPOSED IN-SITUAIR SPARGING SYSTEM LOCATION AND DESIGN <br /> The IAS compressor will operate independently from the SVE unit. This will allow for control of <br /> the air flow to the sparge wells and``surging"of the IAS system, if necessary,to prevent mounding . <br /> and/or migration of the dissolved hydrocarbons. A separate electrical source will be necessary for <br /> the IAS,system. <br /> A one-inch diameter PVC piping network will carry air from the compressor to the sparging wells. <br /> The FVC piping will be installed beneath the ground surface. A PVC flow control valve will be <br /> :..} installed at each Sparging well to direct air flow. <br /> 3.2.3. PROPOSED MONITORING ACTIVITIES <br /> Quarterly ground water monitoring and sampling is proposed throughout the remediation period. <br /> However,we recommend measurements of ground water depth and dissolved oxygen on a monthly <br /> basis to determine if ground water mounding is occurring as a result of the operation of the IAS <br /> system and to monitor efficiency of the sparge-points. <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 <br /> building permits will be obtained from the City of Stockton Building Department for necessary <br /> construction work, including natural gas and electrical source installations. <br /> 3.4. SYSTEM MAINTENANCE <br /> The SVEIIAS system will be maintained on a weekly basis, according to manufacturers <br /> recommendations. After stabilization, routine maintenance would represent the only periods of <br /> Advanced GcoEnvironmental,Tnc. <br />