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the irrigation wells and well MW1 indicated that the data was generally valid and that <br /> ' groundwater gradient was northerly <br /> ' On May 5 and 6, 1992, two soil borings were drilled to 76 feet below grade to provide for the <br /> installation of groundwater monitoring wells The locations of the borings (MW2 and MW3) <br /> ' are shown on Figure 2 <br /> ' Drilling was conducted by Spectrum Exploration, (C57 license #512268) using a hollow-stem <br /> auger drill rig A field geologist was present to log all drill cuttings and soil samples utilizing <br /> ' the Unified Soil Classification System Descriptions of soil types encountered, sample collection <br /> intervals, and well construction details were recorded on boring/well logs These are included <br /> ' in Appendix I Cored soil samples were collected above and below the water table at 5-foot <br /> intervals Samples were collected in brass sleeves with a California modified split spoon <br /> ' sampler All samples were screened with a photoiomzation detector (PID) for the presence of <br /> volatile organic hydrocarbons Samples selected for analysis were sealed with teflon, a plastic <br /> cap and duct tape, then placed in sealed plastic bags and transported on ice in an air tight cooler <br /> Three soil samples were selected trom each boring For laboratory analysis, including one from <br /> ' the soil/water table interface Analysis was conducted for benzene, toluene, ethylbenzene, <br /> xylenes (BTEX -EPA method 8020) and total petroleum hydrocarbons as gasoline (TPHG -EPA <br /> ' method 5030/8015) The samples were analyzed by State certified RESNA Environmental <br /> Laboratory <br /> 1 <br /> All drill cuttings were placed on plastic sheeting, covered with same, and stored on-site pending <br /> ' laboratory results Water used to clean the augers atter drilling each boring were collected and <br /> stored in 55-gallon drums approved for hazardous liquid storage pending laboratory analysis for <br /> ' disposal <br /> ' The monitoring wells were constructed of 2-inch inside diameter PVC well screen/casing The <br /> wells were completed as shown on Figure 3 A 0 010-inch well screen slot and #2 mesh sand <br /> pack was used for the filter pack Cement/sand slurry was used to seal the well, in accordance <br /> with California Water Well Standards (December 1981) To protect the integrity of the well a <br /> ' R-052992 I,F 6 <br />