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SCOPE OF SERVICES <br /> Drilling and sampling operations will be directed by a PSI field supervisor. Prior to <br /> subsurface drilling activities, PSI will notify the utility service alert in accordance with <br /> local practices. Equipment decontamination, sample collection, field documentation, <br /> sample custody and laboratory analyses will be in general accordance with methods <br /> prescribed by the EPA and the State of California. Drilling will be conducted by a State <br /> of California licensed driller, and laboratory analysis will be performed by a State of <br /> California licensed laboratory. A drilling permit will be obtained from the San Joaquin <br /> County Environmental Health Department prior to drilling. Investigative-derived waste <br /> from the site will be returned to the site where conditions allow; otherwise, the material <br /> will be drummed and left on site for future handling by the client. Field quality control <br /> samples will not be collected and analyzed as part of the assessment, limiting the data <br /> validation process, and therefore, the data provided will be considered sufficient for <br /> preliminary evaluation purposes only. <br /> The specific scope of this project is described below. <br /> 1. Drilling of two borings by direct-push drilling methodology. The borings will be <br /> located adjacent to the existing hoists. Based on the typical construction of <br /> hydraulic hoists, PSI does not anticipate drilling deeper then 20 feet below ground <br /> surface (bgs). PSI will collect soil samples at five-foot intervals for chemical <br /> analyses. Based on groundwater information for wells formerly on the property, <br /> groundwater is approximately 60 feet below ground surface (bgs) and will not be <br /> encountered. Following drilling of the borings, they will be backfilled with neat <br /> cement. <br /> 2. Drilling of one boring by hollow-stem auger drilling methodology. The boring will be <br /> located downgradient of the former underground storage tanks. Based on a <br /> groundwater depth of approximately 60, PSI does not anticipate drilling deeper <br /> then 70 feet below ground surface (bgs). PSI will not collect soil samples unless <br /> soil impact is noted. Following drilling of the borings, they will be backfilled with <br /> neat cement. <br /> 3. Laboratory analysis of soil samples will include the following: <br /> Three soil samples per boring from the direct-push borings will be analyzed for <br /> volatile organic compounds according to EPA Method 8260 and for Total <br /> Petroleum Hydrocarbon as Hydraulic Oil (TPH-HO) by a modified EPA Method <br /> 8015M. If TPH-HO concentrations are greater than 100 milligrams per kilogram <br /> (mg/kg), the soil samples will be analyzed for Polychlorinated Biphenyls according <br /> to EPA Method 8081. <br /> One groundwater sample per boring from the hollow-stem auger boring will be <br /> analyzed for volatile organic compounds according to EPA Method 8260 and for <br /> Total Petroleum Hydrocarbons as Gasoline and Diesel (TPH-G and TPH-D) by a <br /> modified EPA Method 8015M. <br /> Interra, Stockton,California <br /> PSI Proposal No.: 865-8G0001-Rt <br /> January 9,2008 <br /> Page 2 of 6 <br />