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`'Work Plan for Additional Groundwater]nvesti�ion Quik Stop Market No. 132 3555 West Hammer Lane Stockton,California WORK DESCRIPTION Task 1. Obtain Boring Permits and Encroachment Permits Encroachment permits for drilling within the City of Stockton right-of-way (sidewalk) along West Hammer Lane, will be obtained from the City of Stockton Public Works Department. In accordance with City of Stockton requirements, a copy of ATC's insurance certificate naming the City of Stockton as additional insured will be placed on file with the City. An Application for Well/Pump Permit will be completed and filed with the San Joaquin County Environmental Health Division. Task 2. Install Groundwater Monitoring Well and Perform Sampling and Analysis In order to further delineate the lateral extent of petroleum hydrocarbon impacted groundwater downgradient of ATC-2, one additional groundwater monitoring well is proposed at a down- gradient location in the sidewalk along West Hammer Lane as shown on Figure 2. The borehole will be drilled by a drilling contractor with a current C-57 license. All project work will be performed under the direction of a California Registered Geologist. Soil and groundwater samples will be obtained from the soil boring and will be analyzed by a California-certified laboratory for TPH-G by EPA Method 8015M, BTEX by EPA Method 8020, and MTBE and other fuel oxygenates by EPA Method 8260. The groundwater sample obtained from the newly installed groundwater monitoring well will be obtained during the subsequent groundwater monitoring and sampling event. The borehole location will be marked and cleared for under ground utilities prior to drilling. The groundwater monitoring well will be drilled using a truck mounted Mobile B-61 drill rig or equivalent equipped with continuous flight, hollow stem augers. The groundwater monitoring well will be drilled to a maximum depth of approximately 30 feet bgs. Undisturbed soil samples will be collected at approximate 5-foot intervals from the soil boring. Soil samples will be obtained with a California modified split spoon sampler. The sampler will be driven into undisturbed soil ahead of the auger bit using a 140-pound downhole hammer. The split spoon sampler holds three brass tubes for the collection of soil samples. Upon removal of the tubes from the sampler, the lowermost tube will be capped with Teflon liners and plastic caps. One or more soil samples will be selected from the boring from the vadose zone for laboratory analysis. The sample(s) will be placed in an ice chest prior to being hand delivered to a State certified laboratory. The soil in the middle tube of the sampler will be screened for organic vapor with a photo ionization detector (PID) for evidence of petroleum hydrocarbon vapors. The soil in the uppermost tube will be examined for lithology (provided complete sample recovery occurs). The field geologist will prepare a log of the subsurface OTleasanion\adminuk�artinez\QuikStop\Quik 132WurkplanObsite.doe 4