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16 April 1997 <br />AGE -NC Project No 95-0121 <br />Page 6 of 9 <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 one -inch diameter PVC pipe will carry air from the blower to the sparging points The PVC piping <br />will be installed beneath the ground surface A plan of the proposed piping system is depicted in <br />Figure 6 <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 MW -1 through MW -9 on a monthly basis to determine if ground water mounding <br />is occurring as a result of the operation of the IAS system <br />33 PERMITTING <br />An application for a site specific permit will be submitted to the San Joaquin Valley Aar 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 />34 SYSTEM MAINTENANCE <br />The SVE/IAS system will be maintained on a weekly basis, according to manufacturers <br />recommendations After stabilization, routine maintenance would represent the only periods of <br />"down time" for the unit One to two tames each month (assuming 24-hour operation), the unit will <br />be shut down for routine maintenance procedures such as lubrication, oil changing, and system <br />adjustments <br />3 5 CONFIRMATION SOIL SAMPLING <br />• After approximately six months of operation or efficiency of the unit has declined, confirmation soil <br />sampling should be performed withing the "core" impacted area The confirmation soil borings will <br />