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0`4�M* <br /> k7 <br /> 1" <br /> r <br /> The wJH report, Plate V, indicated the regional groundwater <br /> gradient to be dipping to the northwest. <br /> Figure 2, groundwater levels, Spring 1990, slow t1le same <br /> trend and indicate present groundwater <br /> to be abo39' <br /> 25' below ground level (estimating ground <br /> level the map for <br /> be <br /> MSL, minus water table at 13' MSL) . Figure <br /> water levels in the fall of 1983, slwows the highest water <br /> level during recent years to have been about 15' below <br /> ground level (estimating ground level to be 39'MSL, minus <br /> water table at 24' MSL) . <br /> PROPOSED WORT: <br /> A safety operations plan for the drilling, sampling and well <br /> construction operations is to be supplied by the contractor. <br /> Figure 4 is a site map showing the locations of the property <br /> and the various features discussed. This map, as those in <br /> the WJH Site Assessment Report, were not surveyed but are <br /> iciently accurate for the purposes of <br /> believed to be suff <br /> this report. The monitoring wells, when drilled, will be <br /> map and the relative eleva- <br /> accurately located on a site <br /> tions of the well heads will be established so that an <br /> accurate water table slope can be established. <br /> Proposed Monitoring Well # 1 is located adjacent to the site <br /> from which the contaminated soil was ,removed and in the <br /> direction of probable water flow. Wells # 2 and # 3 will be <br /> located about 140'-150' southerly and westerly of #4 i . These <br /> locations were chosen so that all three wells would be on <br /> Raymond Investment property. If water contamination is .found <br /> at the # 1 well site, then at least one more well will be <br /> necessary in a down-flow direction. , which will be deter- <br /> mined from the three wells. <br /> Figure 5 is a type diagram for the proposed monitoring <br /> wells. A 7"-8" O.D. nominal size, hollow stem auger hole <br /> will be bored to approximately 40' below ground level, or to <br /> at least 10 feet into the water table, wherever it is <br /> located. Truck mounted equipment will be used. 50 gallon <br /> drums with sealing covers will be on site to collect auger <br /> cuttings and water if the wells are <br /> inbailed <br /> the and <br /> le. samples <br /> collected prior to cementing pip <br /> The solid <br /> materials will be stored on site with the excavation spoil <br /> and will be properly disposed of after the operation is <br /> completed. The water will bbee disposedty of Mof in the s ewe wer ifwill <br /> permission is granted by t <br /> be cased with 4", screw jointed PVC with the bottom 10' <br /> perforated with .02" slots and the surrounding well bore <br /> packed with # 3 sand or equivalent as a filter. A 2' to 5' <br /> bentonite clay plug will be placed above the perforations as <br /> a_protection from cementing operations. The upper 25' plus <br /> - -- - <br /> or minus annulus- between--the--bore-hole- and the-wel -_c_asing- --- <br /> 2 <br />