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• S E C O R • <br /> Work Plan for Monitoring Well Installation <br /> July 31, 2007 <br /> Former ARCO Service Station No. 4932 <br /> Stockton, California <br /> Page 8 <br /> around the slotted well casings) will be accomplished by rigorously surging the well over the <br /> length of the screen interval with a vented surge block followed by bailing to remove <br /> accumulated sediment and by purging approximately 10 casing volumes of water. Final purging <br /> will be performed with either a submersible pump or bailer, and pH, temperature, and <br /> conductivity will be measured at regular intervals during purging. Development will be <br /> considered complete when either; 10 well volumes have been removed and physical-chemical <br /> parameter trends have stabilized over three consecutive measurements (<0.05 pH, 3% <br /> conductivity, and 10% temperature), 10 well volumes have been removed, or until the well has <br /> been purged dry (if the well does not sustain flow or is slow to recover). <br /> Task 5 —Waste Handling and Disposal <br /> All investigation derived waste (IDW), including soil cuttings and purge water from well <br /> installation and development, will be stored on-site in Department of Transportation-approved <br /> containers pending the results of laboratory analyses. Analytical results will be used for waste <br /> profiling and disposal. After profiling, IDW will be transported and disposed of at an appropriate <br /> State-certified disposal facility. Due to the large soil volume that will be generated, roll-off bins <br /> may be used to store drill cuttings at the site. <br /> 4932 WP for MW Installation 2007.doc SECOR International Incorporated <br />