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1 <br /> 3.2 Logging <br /> MSoil was extruded from the second brass tube and screened for the presence of organic <br /> vapors, using a PID, and the readings were recorded on the boring logs The soil was then <br /> ' described in accordance with the Unified Soil Classification System (see Boring Logs, <br /> Appendix A) <br /> 3.3 Boring Backfilling and Well Completion <br /> Borings B-10 and B-11 were backfilled to grade with Portland Cement Monitoring wells <br /> 1 were completed with 2-inch diameter PVC casing with 0 020 screen from 68 to 88 feet The <br /> filter pack (#2112 sand) was installed from 66 to 88 feet Bentonite chips were used to make <br /> a two foot plug and the well was grouted to the surface with Portland Cement <br /> 3 4 Monitoring Well Sampling <br /> ' On November 10, the water levels in all three wells were measured relative to the top of <br /> the casing using a Solonist water level meter The relative piezometric levels and hydraulic <br /> gradient were determined from these data <br /> After water levels wei e measured, a stainless steel bailer was used to remove sediments <br /> from the bottom of each well After removal of excess sediments, a PVC bailer was used <br /> M to surge and purge each well Approximately 7 gallons of water were removed from each <br /> well to stabilize temperature, pH and conductivity (see Table 1) The purge water was <br /> stored on-site in 55-gallon drums <br /> Water samples were collected from each well using a new disposable plastic bailer The <br /> 1 g P <br /> samples were collected in 40 ml EPA vials and 1 liter amber bottles The samples were <br /> placed in a chilled container and transported under chain-of-custody to Alpha Analytical <br /> Laboratories (AAL) in Ukiah <br /> 3.5 Monitoring Well Surveying <br /> ' On December 3, 1993, the elevation of the three monitoring well casings were surveyed <br /> relative to the fire hydrant at the southeast corner of Mariposa and Farmington Roads The <br /> hydrant was assigned an ai brtrary elevation of 100 feet The relative groundwater elevations <br /> were then calculated using these data (see Section 4 2) <br /> 3 6 Laboratory Analysis of Soil and Water Samples <br /> ' A total of 14 soil samples were analyzed for total petroleum hydrocarbons (TPH as <br /> gasoline) and volatile aromatics (BTE&X) in accordance with EPA methods 8015m and <br /> ' 8020, respectively Three of the 14 samples were analyzed for TPH as diesel in addition to <br /> 10 <br /> Oof.0 Audi WA12 Ic 5 <br /> P.w[.c Ga.A2 1693/6525 <br /> 1 <br />