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fZSMA <br /> Working To Restore Nature <br /> Methodology <br /> On May 26 and 27, 1994 two soil borings were drilled to 75 feet below grade to provide for the <br /> ' installation of groundwater monitoring wells The locations of the borings are shown on Figure <br /> 2 <br /> Drilling was conducted by Spectrum Exploration, (C57 license #512268) using a hollow-stem <br /> auger drill ng A field geologist logged all drill cuttings and soil samples utilizing the Unified <br /> Soil Classification System Descriptions of soil types encountered, sample collection intervals, <br /> ' and well construction details were recorded on boring/well logs and included in Appendix I <br /> Cored soil samples were collected above and below the water table at 5-foot intervals Samples <br /> were collected in brass sleeves with a modified California split spoon sampler Subsequent to <br /> sample collection the samples were screened with a flame ionization detector (FID) for the <br /> ' presence of volatile organic hydrocarbons Samples selected for laboratory analysis were sealed <br /> with teflon tape and plastic caps, placed in sealed plastic bags and transported on ice in an air <br /> tight cooler The soil samples collected from the soil/water table interface were submitted to <br /> ' the laboratory for BTEX and TPHg analysis by EPA methods 8020 and 5030/8015, respectfully <br /> The samples were analyzed by State-certified Sequoia Analytical Laboratory (FLAP #1210) <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 after drilling each boring was 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 4-inch inside diameter PVC well screen/casing, and <br /> were completed as shown on Figure 4 The well screen was 0 020-inch slot and #2/12 mesh <br /> ' silica sand was used for the filter pack Neat cement was used to seal the wells, in accordance - <br /> with California Water Well Standards (December 1981) To protect the integrity of the wells <br /> 1500411REPORTMSR-0694 M 7 <br />