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Wright <br /> Environmental <br /> Services, Inc. <br /> October 16, 1948 Construction ♦ Engineering ♦ Remediation <br /> Project No. 3113 <br /> Mr. Rich Wilson <br /> 48005 Airport Way <br /> Stockton, California 95206 <br /> Re: Proposed Soil and Groundwater Sampling Workplan <br /> A. G. Spanos Jet Center, Stockton, CA <br /> Dear Mr. Wilson, <br /> Wright Environmental Services, Inc. (Wright) has prepared this workplan for the <br /> above referenced site. Two 12,000 gallon underground storage tanks used for jet A <br /> and Aviation gasoline are scheduled for removal. Replacement tanks may be placed <br /> in the same excavation or an alternative location (see Figure 1). One 20,000 gallon <br /> underground storage tank used for Jet A fuel is located nearby will remain and is n o t <br /> included in this work. <br /> Technical Approach <br /> The technical approach to this project is to place up to three exploratory borings at <br /> the locations shown on Figure 1. The borings will provide soil and groundwater <br /> quality information and geotechnical information. This approach will provide the <br /> background information for engineering design, potential contaminant location and <br /> depth to groundwater for this site. In addition, this information will be used to <br /> design shoring for excavation work and soil subsurface tank soil engineering <br /> parameters. <br /> Scope of Work <br /> Exploratory, Borings <br /> Up to three exploratory borings will be drilled at the locations shown on Figure 1. <br /> Two borings will be placed in the existing tanks area and one boring in the possible <br /> alternative location. Drilling permits will be secured from the San Joaquin County <br /> Public Health Service-Environmental Health Division (PHS-EHD) prior to doing the <br /> field work. The boreholes will be drilled with truck mounted hollowstem auger <br /> drilling equipment. All drilling equipment and sampling tools will be cleaned prior <br /> to arriving, and before leaving the site. The augers will be advanced to the desired <br /> sampling depth interval, and a drive split spoon sampler will be driven ahead of t h e <br /> drill bit. The sampler will then be retrieved and dissembled, and the soil filled brass <br /> liner will be sealed with Teflon@ paper and plastic endcaps, labeled, logged onto <br /> chain-of-custody forms and place in a chilled ice chest. <br /> The boreholes will be logged using the Unified Soil Classification System under t h e <br /> supervision of a registered geologist using the attached Wright Sampling Protocol. <br /> Additional lithologic information will be collected to describe the subsurface geology. <br /> 4220 Commercial Dr.,Suite 5 • Tracy,CA 95376 <br /> 209.833.0758 • Fax 209.832.5152 <br /> Wright@inreach.com Lic. #651501 A-B HazMat iA, <br />