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Revised Phase II Limited Site Assessment Proposal <br />540 East Main Street, Stockton, California <br />requests utility location and markings for all buried utilities. A private utility locate will be <br />conducted by GPRS, Inc. The third party located will be conducted to locate any remaining <br />underground utilities in the vicinity soil boring locations. ATON will develop a site-specific <br />Health and Safety Plan (HASP) for our personnel and subcontractors to use during field services. <br />A drilling permit will be obtained through Alameda County California prior to drilling. <br />ATOM will advance up to three soil borings at the site utilizing adirect-push system to <br />hydraulically drive stainless steel probes to sample the subsurface material. Soil Boring S134 will <br />be advanced in the southwest corner of the parking lot until contamination, groundwater, or <br />bedrock/probe refusal is encountered, or a total depth of 25 feet below ground surface <br />(whichever is encountered first). In the basement of the main building, two additional soil <br />borings will be installed to a depth of five feet below ground surface. The soil boring will be <br />converted to soil vapor probes to assess whether an impact has occurred to the subsurface <br />from adjacent former dry cleaners. Throughout drilling and sampling, ATON staff will visually <br />observe and field screen soil samples with portable chemical analytical equipment to determine <br />if residual contamination is present in the samples. ATON will collect up to one (1) soil sample <br />and one groundwater sample from Soil Boring S134. Temporary soil vapor probes will be <br />installed in Sol Borings SB -2 and SB -3. After the probes have cured for two hours, a soil vapor <br />sample will be collected from each soil vapor probe. After sampling is completed, the <br />piezometer and soil vapor probes will be removed, and the soil borings will be properly <br />abandoned based on current California regulations. The soil, groundwater, and soil vapor <br />samples will be submitted under chain of custody procedures to an accredited off-site <br />independent laboratory. The following analyses will be conducted on the soil and groundwater: <br />Volatile organic compounds (VOCs) by Method 8260 for the soil and groundwater <br />samples; and <br />VOCs by Method TO -15 for the soil vapor samples. <br />Soil, groundwater, and soil vapor sampling procedures, analytical results, and ATON's findings <br />will be presented in a Phase II LSI Report. The results of the investigation will be compared to <br />the appropriate California Programs soil, groundwater, and soil vapor standards. <br />If generated, unused soil and other investigation -derived waste (IDW) will be placed in CC ll <br />drums, which will be closed and staged on site. ATON will contract with a special waste disposal <br />company for the transportation and disposal of the IDW. The waste disposal company will <br />require a copyof the laboratory analysis report forthis purpose. Control, transport, and disposal <br />of wastes will be performed in compliance with applicable local, state, and federal regulations. <br />Disposal materials will be manifested, and copies of all manifests will be provided to ATON. <br />7 <br />