Laserfiche WebLink
0E01 <br /> approximately 32 and 40 feet bgs. The grab groundwater samples were collected by lowering a <br /> I 1-inch diameter Schedule 40 PVC piping consisting of blank casing and 5 or 10 feet of slotted <br /> well screen through the hollow-stem augers to the bottom of the boreholes at about 40 or <br /> 45 feet bgs. The augers were then retracted to approximately 30 to 35 feet bgs to expose the <br /> water-bearing units. A small-diameter bailer was lowered into the PVC piping, and <br /> groundwater was decanted from the bailer into acidified 40-milliliter VOA vials and two <br /> 0.5-liter amber glass bottles provided by the laboratory. Sample containers were labeled, <br /> i <br /> } sealed in plastic bags, and stored in an ice-cooled chest for delivery to F&B under Geomatrix <br /> COC procedures. <br /> After sampling, Type I-II neat-cement grout was placed in the boreholes from the bottom to the <br /> ground surface via a tremie pipe. Grouting was inspected by a Stanislaus County inspector. <br /> 1r1 Soil cuttings were stored on site in labeled 55-gallon steel drums pending disposal by <br /> 1 ChevronTexaco. <br /> _] 3.3.3 Water Supply Well Sampling <br /> On October 29, 2003, a water sample was collected from the water supply well located on the <br /> property. Information pertaining to the construction of this well was not available. Prior to <br /> l sampling the well, water was purged by operating the well pump for at least 1/2 hour. <br /> The sample was collected directly from the pump effluent stream on the wellhead and into <br /> '.� three acidified 40-milliliter VOA vials, three 1-liter amber glass bottles, two 500-milliliter <br /> polyethylene bottles, and two 250-milliliter polyethylene bottles. Sample containers were <br /> labeled, sealed in plastic bags, and stored in an ice-cooled chest for delivery to Severn Trent <br /> lLaboratories (a California-certified laboratory) of Pleasanton, California, under COC <br /> 1.1 . procedures. <br /> 3.3.4 Analytical Methods <br /> Soil samples were analyzed for TPHc (CIO-C36 carbon range) using EPA Method 8015 <br /> l Modified; BTEX using EPA Method 802113; and PAHs using EPA Method 8270 SIM. Soil <br /> samples collected from the following locations were also analyzed for CAM 17 metals using <br /> EPA Method 6010: <br /> Soil Boring Location/Description <br /> I ASB-3 Former piping manifold and former tank storage area <br /> ASB-8 Former rubbish pit <br /> ASB-11 Former incinerator area <br /> 1APROJECW000A5011.000\5011-03.doc 16 <br />