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Work Plan for Additional Assessment :_ C 0 R ARCO Service Station No.2133 and Chevron Service Station No.9-4275 Stockton,California Page 4 be measured at regular intervals during purging. Development will be considered complete when either 1) 8 well volumes have been removed and physical-chemical parameters trends have stabilized over three consecutive measurements (<0.05 pH, 3% conductivity, and 10% temperature), 2) 10 well volumes have been removed, or 3) until the well has been purged dry (if the well does not sustain flow or is slow to recover). Task 6—Waste Handling and Disposal All investigation derived waste (IDW), including soil cuttings and purge water from well installation and development will be stored on-site in Department of Transportation-approved 55-gallon drums and/or roll off bins pending the results of chemical analyses. Analytical results will be used for waste profiling and disposal. After profiling, IDW will be transported and disposed at an appropriate State-certified disposal facility. Task 8— Surveying Once the proposed well is installed, a California-licensed land surveyor will survey the location and top of casing elevation of all monitoring, air sparge, and soil vapor extraction wells, relative to a known benchmark according to the North American Datum of 1983 (NAD83) and the National Geodetic Vertical Datum of 1929 (NGVD29). The new well will be surveyed relative to the same benchmark used for the existing wells. Survey data will be included in information uploaded to the State Water Resources Control Board (SWRCB) Geotracker Database in accordance with Assembly Bill (AB) 2886 requirements. REPORTING Upon completion of the work proposed herein, SECOR will prepare a report summarizing field activities and analytical results of the investigation. The report will be submitted to Chevron and ARCO and the SJCEHD and will include tabulated field, analytical, figures depicting subsurface conditions including soil and groundwater chemical analytical results; and appendices containing laboratory reports, well completion and soil boring logs, and copies of field notes and data sheets. The report will also include conclusions and recommendations for further work. In addition, this report will be uploaded into Geotracker. SCHEDULE SECOR is prepared to initiate field activities on May 31, 2007. We anticipate that field work will require approximately 1 day to complete. The report will be submitted four to eight weeks after field activities.