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• Preparing a project-specific Health & Safety Plan to address potential physical and chemical hazards that may be encountered during the investigation in accordance with OSHA requirements as specified in 29 CFR 1910.120(b); • Installing one soil probe to a depth of 16 feet below ground surface, at first encountered groundwater using a Geoprobe soil sampling rig in the vicinity of the septic tank leach field; • Collecting one soil and one groundwater grab sample from the soil probe; • Submitting each of the samples to an analytical laboratory for chemical testing of TPH-g and TPH-d by EPA Method 8015 modified, benzene, toluene, ethylbenzene, xylene, and methyl teritary butyl ether by EPA Method 8020, semi-volatile organic compounds by EPA Method 8270, volatile organic compounds by EPA Method 8010, and metals by EPA Method 7000/6010. Chemical testing was conducted on a standard turn-around basis (5 days); • Collecting one tap water sample from the onsite building; • Submitting the tap water sample to an analytical laboratory for chemical testing of TPH-g and TPH-d by EPA Method 8015 modified, benzene, toluene, ethylbenzene, xylene, and methyl teritary butyl ether by EPA Method 8020, semi-volatile organic compounds by EPA Method 8270, volatile organic compounds by EPA Method 8010, metals by EPA Method 7000/6010 and total coliform and fecal count. Chemical testing was conducted on a standard turn-around basis (5 days);and, • Preparing a data transmittal letter presenting the results of the investigation. METHODOLOGY Soil probes were advanced using a direct-push vibratory coring rig equipped with an approximately 2 Y2- inch diameter sample probe by Kvilhaug Well Drilling and Pump Co. of Concord, California. Figure 2 presents the location of the soil boring. Relatively undisturbed soil samples were continuously sampled with a 4-foot-long split spoon sampler lined with a continuous Macro Core tube sample sleeve. The grab soil sample was collected at a depth of 11 feet below ground surface (bgs). Subsurface soil lithology was logged by a Dames & Moore geologist according to the Unified Soil Classification System. Soil from each sampler was screened in the field for total organic vapor emissions using a Photoionization Detector (PID). The PID readings were recorded on the detailed soil log. For the soil sample collected for laboratory analysis, a section of the Macro Core tube sample sleeve was cut in the field and the exposed soil on each end was covered with Teflon sheeting and sealed with plastic end caps. The sample was labeled with the following information: boring number, sample number, depth, date, collector name, owner, and time of collection. The sealed sample was stored in a chilled ice chest in the field and during transfer to the laboratory. All samples collected were transferred to Entech Analytical Labs in Sunnyvale, California following standard chain-of-custody procedures. DAMES&MOORE 2