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• Complete the soil borings as groundwater monitoring wells <br /> • Analyze the groundwater samples collected from each well for BTEX and TPHG by <br /> EPA methods 8020 and modified 8015, respectively <br /> ' • Prepare a summary report <br /> ' MONITORING WELL INSTALLATION AND DEVELOPMENT PLAN <br /> Due to the lack of consistent groundwater gradient and direction data RESNA will survey and <br /> ' monitor well MW-1 and the irrigation well located 65 feet south of the former tank location <br /> Hydraulic gradient and direction will be estimated from the monitoring data collected This <br /> ' information will be used to select the optimum locations for the proposed monitoring wells The <br /> use of this information is predicated on hydraulic continuity between first water and the deeper <br /> ' interval screened in the irrigation well An abnormally large difference in potentiometnc surface <br /> between the two wells will indicate that the data are not valid and cannot be used for well <br /> placement <br /> ' Two soil borings will be drilled to approximately 80 feet below grade to provide for the <br /> installation of groundwater monitoring wells The estimated locations of the borings (MW2 and <br /> MW3) are shown on Figure 3 Actual position will be determined after monitoring activities <br /> are complete <br /> 1 <br /> Drilling will be conducted by a state-licensed (C57) drilling company, using a hollow-stem auger <br /> ' drill ng A field geologist will be present to log all drill cuttings and soil samples utilizing the <br /> Unified Soil Classification System Descriptions of soil types encountered, sample collection <br /> ' intervals, and well construction details will be recorded on boring/well logs and included an the <br /> site assessment report Cored soil samples will be collected above the water table at 5-foot <br /> ' intervals, if possible, and below the water table at select intervals Samples will be collected <br /> in brass sleeves with a California modified split spoon sampler All samples will be screened <br /> with a photolonazataon detector (PID) for the presence of volatile organic hydrocarbons <br /> Samples selected for analysis will be sealed with teflon, a plastic cap and duct tape, then placed <br /> ' R-021492 LF 6 <br />