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MaE <br /> El <br /> t•Ar 3 <br /> Dmmond 1.umSx•e-j_ji•CA <br /> 3-[1 1R CONTAMINAJ-ION AS5li5.SMLN"t' <br /> Gl2UIJNDWA"1 <br /> 3.1 Pian <br /> l <br /> t ualilied and has been used Monitoringi he existing groundwater monitoring wells on-site have been evaluated to determine groundwater to develop a <br /> flow direction. "i'his background data will 1 <br /> wells as <br /> iJ <br /> Program to assess the full extent of site contamination and monitor well location maybe modified <br /> p g } sure 2. The bot <br /> indicated diagramattatic;all'on ri <br /> • ted from any wells having floating free product. <br /> following review by and discussion with Public H`altlt 5cn+iccs rcpresentativcs. During than PI"ase <br /> of work, g <br /> rounciwater samples will not be colt <br /> supervision during drilling will minimize the potential for pencirataun of any cunCne <br /> Geologic <br /> of aquifers. <br /> t <br /> 3.2 Drilling Method previous <br /> period March-August 1985,groundwater is greater than 20 <br /> The monitoring wail will be installed ten feet int <br /> the groundwater :aquifer. Base on lin. <br /> t consultvnts investigations during the pc <br /> well construction details. The screened interval will <br /> feet below ground surface. A drilling schedule will be finalized upon approval of than work to 4 <br /> Figure 3 illustrates the proposed monitoring <br /> 1 ' ' der will be blank casing. The annular space from <br /> schedule 40 PVC 4-inch diameter 0.02 factory-SIO casing installed from the end of hole <br /> feet about the groundwater surface. The remain <br /> 9 <br /> the bottom of the bore to 3 feet above the screencd wi11 be filled with#2 grade sands. <br /> M1 A 2-foot bentonite seal will be placed above the s <br /> pace to <br /> e annular s <br /> Grout composed of Portland cement and 4 percent bentonite willthen be set over each wellhead <br /> Locking well caps and r traffic bearing well box set to grade will t <br /> in a traffic zone. <br /> 3.3 Development Method <br /> moving at <br /> The wells will be developed by <br /> surging with a surge biocekla�and <br /> and stored in DOT approved <br /> casing volumes. Alc loPmen disposal byer and the cpeRt flogs will <br /> drums on-sate forproper <br /> 3.4 Groundwater Sampling <br /> preliminary Testingsured with an oillwater interface probe. <br /> Thickness of floating free product, if any, will he meaand total Lead. <br /> • sample collection procedures will fallow nor Mal grTuFndgaPaHfGFmpltng Protocol <br /> Well purging and p <br /> - <br /> -as described below. Water samples will be analyzed for the TOc elevations will be surveyed <br /> - - - -- wells,the op-of-casing( ) --- ---- --- --- <br /> Following installation of the monitoring <br /> relative to an arbitrary datum. At least 24 hours after the development of wells;water dept will - - <br /> ! he measured and plowed relative to the datum. <br /> j^' S�eflen Rubeetwn and Kirsten . <br /> :'may <br /> Ali [16 111 111 <br />