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l I <br /> Soil samples for chemical analysis will be collected in brass or stainless meet liners, <br /> sealed with Teflon tape and plastic end caps, labeled, placed on ice, and delivered to a <br /> statc-centified analytical laboratory, along with the appropriate chain-of-custody <br /> documentation. <br /> Monitoring Well Installation <br /> Monitoring well MW-8 will be completed by installing 2 inch diameterSchedule 40 <br /> PVC casing The 2-inchdiameter flusb-throarl d casing is gusbally used fen wells <br /> dedicated fen groundwater monitoring purposes. Five to ton feet of fedury machine <br /> slotted well screen will be installed in the baring. A filler pack of graded send will be <br /> placed in the amdm space between the PVC casing and the borehole wall. Send will be <br /> added to the berebole through the hollow stem of the augers to provide a uniform fiber <br /> pack around the casing and to stabilize the borehole. The sand pack will be placed to a <br /> maximum of 2 feet above the screens followed by a minimum 1-foot seal consisting of <br /> bducautepelles. <br /> Cement grout containing 5 pemem hereunto will be placed above the bemo mite seal to <br /> the ground aunt e. A locking monument will be installed over each monitoring well and <br /> watertight cap will be installed over the bop of each well casing. Ref ce elevations <br /> for each monitoring well will be surveyed to flm nearest 0.01-find relative to mean sea <br /> level (MSL) or a snbe datum. <br /> Sparge Well and Vadose Zone Monitoring Well Installation <br /> The exploratory soil borings for the spurge wells and vadose zone monitoring wells will <br /> be advanced using 8-hold-diameter, co us-flight, hollow-stem auger drilling <br /> equipment. Soil sample far logging will be obtained brand eager Mum materials and by <br /> advancing a modified California split-spoon sampler quipped with stainless steel lima <br /> firto undisturbed soil beyond the tip of the auger. Soils will be logged by an IT geologist <br /> consistent with the Unified Soil Classification System and standard geological <br /> techniques. <br /> The spurge wells and vadose zone monitoring wells will be constructed with t-mch- <br /> diameter Schedule 40, flush-joint PVC casing and slotted PVC screen (0.WO-inch slot <br /> width). The screen interval fen the spurge wells are anticryated to extend from a depth of <br /> 55 to 57 l has. The verbose same monitoring wells will be weaned from <br /> approximmley 10 to 20 feet bgs. The vadese zone monitoring wells will be drilled to <br /> depths of approximately 20 to 25 fee[ bgs. The vadoae zone monitoring wells will be <br /> corvstructM with two-inch diameter. <br /> Drill curdaps generated during the drilling procedure will be stockpiled on-site. <br /> Stockpiled drill ratings will be placed on and covered with plastic sheeting. The <br /> stockpiled soil is typically characterized by collecting and analyzing composite samples <br /> from the stockpile. IT will recommend an appropriate method for disposition of the <br /> rt Mn <br />