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Air Sparging Pilot Test Related Activities Report and Remedial Action Work Plan <br />Former Countryside Market, Stockton, California April 30, 2015 <br />temperature, turbidity, and conductivity. The physical measurements obtained during well <br />development were documented on the well development logs included in Appendix F. <br />3.4 Surveying <br />On February 11,2015, Virgil Chavez Land Surveying, of Vallejo, California surveyed and assigned <br />each well location unique, grid-based coordinates, within a minimum horizontal accuracy of +/- 0.05 <br />feet. The geographic coordinate datum referenced was North American Datum, 1983 (NAD83). <br />Top of well casings were referenced to the North American Vertical Datum, 1988 (NAVD88) and <br />were recorded to within an accuracy of +/- 0.01 foot elevation relative to mean sea level. <br />Surveying was completed per AB2886 GeoTracker requirements. A summary of the survey data is <br />provided as Table 3. The California licensed land surveyor data is provided in Appendix F. <br /> <br />3.5 Waste Management <br />All investigation-derived residuals were managed consistent with applicable laws and regulations. <br />Well purge and decontamination water were containerized in 55-gallon drums. Two 55-gallon <br />drums with non-hazardous purge/development/decontamination water were generated during <br />investigation activities. The 55-gallon drums were properly labeled and stored in a temporary <br />waste storage area pending characterization. <br />Soil cuttings generated during site investigation activities were stored in one 18 cubic-yard roll off <br />bin. On January 10, 2015 RES Environmental Services, Inc. of Pittsburg, California transported for <br />disposal 12 cubic yards of non-hazardous soil cuttings to Recology Hay Road disposal facility in <br />Vacaville, California. A copy of the waste manifest is included as Appendix H. <br /> <br />3.6 Soil Sampling and Results <br />3.6.1 Soil Analytical Results <br />Three soil samples were collected from OBS-1 at depths of 20, 55, and 106 feet bgs, two soil <br />samples were collected from VW-1 at depths of 40 and 60 feet bgs and one soil sample was <br />collected from AS-2 at a depth of 95 feet bgs. The retrieved stainless steel sleeves were capped <br />with Teflon® tape, labeled, sealed in a Ziploc® bag, and immediately placed in a chilled cooler for <br />delivery to a State-certified laboratory. Sample identifications were recorded on a chain-of-custody <br />(COC) and delivered to Moore Twining and Associates, Inc. of Fresno, California, at the end of <br />drilling activities. Each collected sample was analyzed for TPHg, VOCs, 7- oxygenates with lead <br />scavengers by EPA Method 8260B and for total lead by EPA Method 6010B. Soil sample <br />results are summarized below: <br />TPHg was detected above the laboratory reporting limits in four soil samples analyzed at <br />concentrations ranging from 140 mg/kg in OBS-1-20 to 4,500 mg/kg in VW-1-40; <br />Benzene was detected above the laboratory reporting limits in one soil sample at a <br />concentration of 0.0031 mg/kg in AS-2-95; <br />3-3 The Source Group, Inc.