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052a assessmang �3? munan -07/1 19 98 Pave (DQ a <br /> An estimated regional groundwater flour appears 4o be to the wes'�- <br /> . norahwes4 at a gradient of 0.01 foot/foot. <br /> 2.00 rs(DnC� L C'TOVDVi DE5 pGn3 ; 2�12RDD <br /> 2A DA0Nno and sa m pHno <br /> Vhethrall <br /> sial boring eves drilled using an 8 inch diameter hollow-stem auger <br /> rig utilizing a drilling contractor who possessed a C-57 drilling license. <br /> [borehole logging was be performed by as State Certified Hydrogeologist who <br /> will kept a detailed hydrostratigraphic log of each borehole by noting <br /> lithologic changes, hydrogeological characteristics, sample locations and <br /> depths, and borehole caving. A groundwater "'grab"' sample was collected <br /> with a steel bailer when groundwater was encountered at 96.4 feet bgs. <br /> Sixteen (�6) of forty-five (45) soil samples collected, were sealed, labeled, <br /> and placed in an ice chest at a temperature of four (4) degrees Celsius, and <br /> submitted 4o ¢a State-Certified laboratory, sander a proper Chain-of-Custody, <br /> to be analyzed for total petroleum hydrocarbons as gasoline (TPH-g) using <br /> EPA Method 8015 modified, for Benzene, Toluene, Ethylbenzene, and <br /> Xylenes (BTEX) using EPA Method 8020, and for MTBE. Soil samples were <br /> also analyzed for gasoline oxygenates by EPA Method 8260. <br /> 10 2.2 Pvlae4hod QJ Drilllnz and sampftz a g®Bl <br /> Vhe bor5ngs were exccavwed with an eighg (8) inch hollow-stem auger drill, <br /> with 5-foot long sections and soil samples were collected with a two (2) inch <br /> inner diameter, five (5) foot long, split spoon sampler at approximate five (5) <br /> foot vertical intervals depending upon the soil stratigraphy and <br /> contaminants encountered. The samples were obtained by the compressive <br /> force of a 140 Ib hammer dropped from a height of 18 inches. The soil <br /> samples were extruded into six (6)-inch long steel or brass sample liners. The <br /> liners, with soil, were placed inside a plastic Zip-Loc bag and a small volume <br /> of soil at the end of the sample was disturbed to allow the volatiles to <br /> accumulate in the bag for approximately two to five minutes. A properly <br /> calibrated photo ionization detector (PID) was used to screen the soil <br /> samples, inside each bag, for the presence of gasoline constituents. The soil <br /> samples with the highest readings were selected for analysis. Every six inch <br /> soil sample recovered was screened with the PID (See Appendix A for Soil <br /> Boring dogs). <br /> Each collected soil sample was covered at each end of the cylinder with <br /> Teflon tape, plastic end caps, and sealed with "duct tape" to adhere the caps <br /> to the liners at each end, to hermetically seal the samples. The soil samples <br /> • were labeled with an ink field marker as to the depth and location the <br /> sample was collected, the sample number, and the project name and <br />