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1 � � <br /> 1 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 16 March 2011 <br /> 1 Page 2 <br /> 1 Sampling Procedures <br /> Sampling activities were conducted between 2 and 4 February 2011. Gregg Drilling and Testing <br /> of Martinez, California provided the drilling services with supervision by Geosyntec personnel. <br /> 1 Temporary sub-slab and soil gas probes were installed at locations 2 through 6 using the <br /> procedures described in Attachment 1 Suggested Operating Procedures. All sub-slab probes <br /> were installed within a hole drilled through the concrete floor slab using a hand-held hammer <br /> drill. All soil gas probes were installed at a depth of 5 ft below ground surface via Geoprobe <br /> direct push methods. The soil gas probes were constructed with a filter pack and bentonite grout <br /> and were completed with a closed ball valve and monitoring well box. Construction diagrams <br /> ' for the sub-slab and soil gas probes are provided as Figures 2 and 3, respectively. Soil gas <br /> samples were collected through dedicated Nylaflow tubing attached to each probe with airtight <br /> fittings and analyzed for fixed gases (Isotech Method BG-2) and volatile organic compounds <br /> ' (VOCs) (EPA Method TO-15). Following sample collection, sub-slab probes were destroyed by <br /> removing the probe hardware, filling with grout, and finishing the surface to match the <br /> surrounding surface. Temporary soil gas probes were destroyed by removing the probe <br /> ' hardware and sample tubing via hand auger, filling with grout, and finishing the surface to match <br /> the surrounding surface in accordance with SJCEHD destruction permit#SR061891. <br /> 1 Groundwater samples were collected at locations 1 through 6 from separate boreholes located <br /> adjacent to the soil gas probes. Groundwater samples were collected through a 1-inch diameter <br /> polyvinyl chloride (PVC) pipe and analyzed for VOCs (EPA Method 8260), semi-volatile <br /> organic compounds (SVOCs) (EPA Method 8270), and hydrocarbon fuels THPg and TPHd (EPA <br /> Method 8015B). After sampling, the PVC pipe was removed and the boreholes were sealed via <br /> ' tremmie pipe with surface finish completed to match the surrounding surface in accordance with <br /> SJCEHD permit#SR061862/061882. <br /> ' Soil samples were collected in Encore samplers and analyzed for hydrocarbon fuels THPg and <br /> TPHd (EPA Method 8015B) and VOCs (EPA Methods 5035/8260) prior to installation of <br /> temporary wells at locations 1, 3 and 4. <br /> ' Investigation-derived waste materials are currently stored on site in labeled drums, pending <br /> laboratory analyses and coordination of appropriate disposal. <br /> 1 <br /> investigationResults_San Joaquin County-3.16.11 <br /> 1 engineers I scientists I innovators <br />