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C <br /> obtain additional data closer to the suspected source. <br /> B. HydroPunch Ih Sampling <br /> The HydroPunch R* samples will be collected by drilling borings with a 6 1/4 <br /> inch outside diameter, 41/4 inch inside diameter hollow-stem auger until groundwater <br /> is reached, approximately 12 feet bgs. .Once in the saturated zone, a HydroPunch IIW <br /> tool will be inserted into the boring. A dedicated stainless steel HydroPunch Ho cone <br /> and 4'/2 foot long, 1 3/8 inch inner diameter Schedule 20 polyvinyl chloride (PVC)- <br /> screen with 0.02-inch factory slots will be advanced into the boring approximately 3 <br /> to 4 feet below the water table or top of the saturated zone with a steel drive casing. <br /> A groundwater sample will then be collected using a 1 inch diameter Teflon bailer. <br /> After the sample is collected, the boring will be grouted. to ground surface with a <br /> Class I/II cement/5% bentonite grout.. Grouting activities will be witnessed by a <br /> representative from the San Joaquin County Health Services Department (SJCHSD). <br /> The groundwater samples will be collected in 40 ml,vials with Teflon* lined <br /> caps. The samples will be submitted to the District laboratory for TPH-g and BTEX <br /> analyses. The analytical methods, sample containers, preservatives, and holding times <br /> are specified in Appendix C. The samples will be numbered and packaged as <br /> specified in Section 3A. <br /> C. Groundwater Monitoring Well Drilling Method and <br /> Construction <br /> The two soil borings will be extended below the water table and completed as. , <br /> L monitoring wells. The monitoring well borings will be drilled with a truck-mounted <br /> CFHSA drilling rig as specified in-Section 3A to a depth of approximately 25 feet <br /> bgs, approximately 15 feet below the water table. The wells will be constructed of <br /> 4 inch diameter, PVC casing with 20 feet of 0.02=inch factory.slotted screen. The <br /> wells will be constructed such that 5 feet of the screen is above the water table at the <br /> time of installation. A Monterey sand #3 gravel pack will be used. The cement <br /> bentonite grout will be tremied into_place and witnessed by a representative from <br /> SJCHSD. A flush-mounted protective casing will be installed over the top of each <br /> monitoring well. The proposed-monitoring construction diagram is presented on <br /> CFigure 4-2. <br /> 93R22 East Bay Municipal Utility District <br /> 40429200.wp 16 Work Plan-Stockton Service Center <br /> e <br /> C - <br />