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5 November 21, 2011 Cardno ERI 2789C.R02 Former Mobil Service Station 99CAS, Stockton, California protocol (Appendix B); a site-specific safety plan; and applicable regulatory guidelines. The work was performed under the advisement of a professional geologist. Pre -Field Activities Prior to field activities, Cardno ERI obtained drilling permits from the San Joaquin County Environmental Health Department (Appendix C), notified Underground Service Alert, and contracted a private utility -locating company to locate underground utilities at the site. From August 15 through 18, 2011, Cardno ERI observed Woodward Drilling Company (Woodward) clear soil borings AS1 through ASS, AS6S, AS6D, SVE1, SVE2, SVE4, and SVE5 using hand and vacuum equipment to check for utilities. During clearance activities, Cardno ERI encountered a 4 -foot metal pipe in boring AS3 not marked by the utility -locating company. Cardno ERI backfilled the location and installed well AS3 in the location for proposed well SVE3. Proposed well SVE3 was not installed. Well Installations From August 23 through 31 and September 19 through 26, 2011, Cardno ERI observed Woodward install wells AS1 through AS5, AS6S, AS6D, SVE1, SVE2, SVE4, and SVE5. Select soil samples were preserved for laboratory analysis. Grab groundwater samples were collected from first -encountered groundwater in select wells and were preserved for laboratory analysis. The AS borings were completed as 1 -inch PVC wells with 60 mesh screen. The SVE wells were completed as 2 -inch PVC wells with 0.020 -inch slotted PVC screen. Groundwater was not observed during drilling in borings AS6S, SVE1, SVE2, or SVE4; however, groundwater was first observed between 35 and 45 feet bgs in the other borings. Well construction details are presented on the boring logs in Appendix D and in Table 2. Laboratory Analyses Cardno ERI submitted soil and groundwater samples for analysis to a state -certified laboratory. Laboratory analytical reports and COC records are provided in Appendix E. Cumulative groundwater analytical data and testing methods are summarized in Tables 1A through 1C. Cumulative soil sample analytical data and testing methods are summarized in Tables 3A through 3C.