Laserfiche WebLink
GRANITE CONSTRUCTION COMPANY <br /> WKA No 2088 06 <br /> October 12, 1994 <br /> Page 4 <br /> PROPOSED SCOPE OF WORK <br /> Ground Water Investigation <br /> Two monitoring wells will be constructed in the vicinity of the former USTs at the locations <br /> shown on Plate 2 Monitoring well MW-7 will be constructed down gradient of monitoring well <br /> MW-2, and monitoring well MW-8 will be constructed up gradient of monitoring well MW-1 <br /> The wells will be drilled with a truck-mounted drill rig, equipped with hollow-stem augers to an <br /> approximate depth of 40 feet below site grade Well installation permits will be obtained from <br /> SJCEHD prior to drilling the monitoring wells <br />• Soil samples will be collected from the well borings at five-foot maximum intervals with a <br /> modified California sampler equipped with clean, two-inch diameter, six-inch long brass tubes, <br /> samples and drill cuttings will be described in the field by an experienced staff engineer or <br /> geologist using the Unified Soil Classification System (USCS) Soil generated during the drilling <br /> process will be placed in sealed and labeled, 55-gallon drums and stored on-site The sample <br /> tubes will be sealed with Teflon sheets, plastic end-caps, and duct tape to reduce volatile <br /> hydrocarbon loss <br /> The samples will be screened in the field with a photo-ionization detector (PID) or similar to <br /> evaluate potential hydrocarbon content Selected soil samples will be stored on ice in an ice chest <br /> and submitted under chain-of-custody documentation to a California-certified laboratory for <br /> analysis of one or more of the following: TPH using Modified EPA test method 8015, BTEX <br /> using EPA test method 8020, and Total Lead using EPA test method 6010 <br /> The wells will be constructed using two-inch diameter, flush-jointed, Schedule 40 PVC casing, <br /> 0 02-inch slotted casing will be used for the screened interval Number 3 sand will be placed in <br /> the well annulus as a filter pack The filter pack will extend from the bottom of the screened <br />• interval to approximately two feet above the top of the screened interval A minimum two-foot <br /> `9% <br /> WALLACE KUHL <br /> Recyiledtwper &ASSOCIATES INC <br />