Laserfiche WebLink
3.2 DRILLING AND SOIL SAMPLING <br /> L Field work will be performed by TRC personnel under the direct supervision of a California <br /> Registered Geologist (RG) or a Professional Civil Engineer(PE). <br /> 2. Prior to drilling,well construction permits will be obtained from the San Joaquin County <br /> Public Health Services Environmental Health Division. Underground Services Alert(USA) <br /> will be notified to assess the potential presence of underground pipelines or utilities. <br /> 3. The boreholes will be drilled using a truck-mounted hollow-stern auger drilling rig. Soil <br /> samples will be collected at 10-foot vertical intervals using a split barrel drive sampler lowered <br /> through the hollow-stem auger. Samples from each depth will be retained in three 6-inch-long <br /> brass tubes. The lower sample tubes will be retained for visual inspection and field testing fox- <br /> volatile <br /> orvolatile organic vapors using a photoionization detector(PID). <br /> 33 WELL COMPLETION,DEVELOPMENT AND SAMPLING <br /> 1. The monitoring wells will be completed to a depth of approximately 110 feet, depending on the <br /> depth to first ground water. The wells will be constructed of 2-inch-diameter Schedule 40 <br /> polyvinyl chloride (PVC)casing with flush threaded connections. The wells will be <br /> constructed by installation of perforated casing(0.01-inch machine cut slots) from a depth of <br /> approximately 10 feet above the top of the water to a depth of 10 feet into the saturated zone. <br /> Blank casing will be installed from the ground surface to the perforated interval. The annulus <br /> will be packed with Grade 212 sand placed to 3 feet above the top of the perforated casing. A <br /> bentonite seal, approximately S feet thick, will be placed on top of the sand filter pack and the <br /> remaining annular space will be sealed with neat cement/bentonite slurry mix. The well head <br /> will,be completed by installation of a traffic cover and a locking well cap. In addition,the <br /> monitoring wells will be protected by the construction of three traffic bollards placed in a <br /> triangular pattern around each well. <br /> 2. After completion of the wells, the elevation of the well tops will be surveyed relative to a known <br /> local benchmark. <br /> 7 <br /> 3. Ground water elevations will be measured in each well using an electric sounder. The depth <br /> will be recorded on the field activity report and/or as appropriate monitoring data sheet. <br /> 4 TRC <br /> cwtomer-Focused ScJo+ ny <br /> �0 'd S0:8 i0. q uer <br />