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18 <br /> in KLEINFELDER <br /> SOIL ASSESSMENT PROPOSAL <br /> O'CONNER WOODS RETIREMENT COMMUNITY <br /> SUTTER CREEK, CALIFORNIA <br /> SEPTEMBER 24, 1990 <br /> (24-YP1691) <br /> INTRODUCTION <br /> The O'Conner Woods Retirement Community is located at 4000 Wagner Heights Road in <br /> Sutter Creek, California (Plate 1). Two underground fuel storage tanks were excavated <br /> and removed. Meinfelder intends to collect soil samples from one boring drilled at each <br /> tank excavation site. <br /> SCOPE OF SERVICES <br /> Task 1: Work Plan Preparation <br /> A boring permit is required from the San Joaquin Local Health District (SJLHD) prior to <br /> drilling a soil boring in the county. The SJLHD has requested a site investigation work <br /> plan be submitted and reviewed before a boring permit will be issued. The work plan <br /> presents the proposed scope of work including: <br /> 0 Boring locations <br /> 0 Method of drilling <br /> 0 Soil sampling procedures <br /> 0 Decontamination procedures <br /> 0 Chemical analysis <br /> 0 Report preparation <br /> A work plan presents a specific scope of work so that there is a clear understanding of the <br /> required investigative procedures between the client and the regulatory agencies. <br /> Task 2: Soil Sampling Activities <br /> A total of two soil borings will be drilled at O'Conner Woods. The borings will be drilled <br /> in the center of the excavation sites as shown on Plate 2. Samples will be collected from a <br /> depth of 10 feet, corresponding approximately to the bottom of the tanks, and at 15 feet. <br /> Soil borings will be advanced using a truck-mounted drill rig equipped with 8-inch hollow <br /> stem augers. During drilling, an experienced environmental geologist will classify the soil, <br /> log the boreholes and collect soil samples for laboratory analysis. <br /> Soil samples will be screened in the field using an organic vapor detector, such as a <br /> photovac TIP, with a photoionization detector (PID) or a Foxboro flame ionization <br /> detector (FID), to provide a qualitative screening of soil and soil samples collected from <br /> the borings. The organic vapor detector measures ionizable compounds in the air in parts <br /> per million by volume (ppmv). Field calibration is performed using a calibrated methane <br /> span gas. Ambient air is used to set the instrument zero. The soil contained in one of the <br /> three brass tubes is exposed and screened with the organic vapor detector. The vapor <br /> reading is noted as the field screening result. <br /> F12-90-40 <br />