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SMTN <br /> ' inch O.D. hollow stem augers. Locations of proposed wells and soil boring were selected based <br /> on San Joaquin County Flood Control Data and are shown on Figure 2. Drilling will be <br /> ' conducted by a State-licensed (C57) drilling company. A field geologist will be present to log <br /> all drill cuttings and soil samples. Descriptions of soil types encountered, sample collection <br /> intervals, and well construction details will be recorded on boringAvell logs and included in the <br /> site assessment report. Soil samples will be collected at five foot intervals and one sample from <br /> ' each boring will be submitted for laboratory analysis. In addition, a groundwater sample will <br /> be collected from the exploratory soil boring using a hydropunch device or similar device. <br /> All drill cuttings will be placed on and covered with plastic and stored on-site pending laboratory <br /> ' results. Selected soil samples and the groundwater sample will be sent using chain-of-custody <br /> record to a State-certified laboratory for the following analyses: priority metals by EPA method <br /> ' 6010; cyanide by EPA method 9010; semivolatile organics by EPA method 625/8270; volatile <br /> organic compounds by EPA method 624/8240; chlorinated pesticides and PCBs by EPA method <br /> ' 608/8080; and total oil and grease by EPA method 5520. <br /> ' The exploratory soil boring will be pressure grouted using a tremie pipe to ground surface upon <br /> ' completion of sampling. The monitoring wells installed to depths of approximately 35 feet, will <br /> be constructed of 4-inch inside diameter PVC well screen and casing. A 0.010-inch well screen <br /> slot and #2/12 mesh sand pack will be used. Neat cement will be used to seal the wells in <br /> accordance with California Well Standards (December 1981). To protect the integrity of the <br /> ' wells, locking, water-tight well plugs will be installed on each well and a water-tight, locking <br /> wellhead labeled "monitoring well" will be concreted over each well. Based on the depth to <br /> ' groundwater at the site in October 1994 (Greensfelder, 1994), the wells are proposed to be <br /> constructed as shown on Figure 3. <br /> ' Task 3 Well Surveying, Monitoring, Development, and Groundwater Sampling <br /> ' The tops of the new wellheads will be surveyed. Measurement of depth to water in all wells <br /> will be completed to evaluate the direction and magnitude of the groundwater gradient beneath <br /> ' N:\95136\REP0RTS\0LIN.WP 4 <br /> 1 <br />