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_ - n <br /> M- 111, _ <br /> I' : The WJH report, plate V, indicated the regional <br /> gradient to be dipping to the northwest, groundwater <br /> Figure 2, groundwater levels, Spring 1990, show the same <br /> trend anc indicate present groundwater levels to be about <br /> 26' below ground level (estimating ground level to be 391 <br /> MSL, minus water table at 13, MSL) , Figure 3 <br /> , the mfor <br /> water levels in the fail of 1983, shows the highestawater <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 WORK <br /> A safety operations plan for the drilling, sam lin <br /> construction operations is to be suppliedp g well <br /> by the conttrara ctor. <br /> Figure 4 is a site map showing the locations of the <br /> and the various features discussed. This map, as thosein! the 'JH Site Assessment Report were not surveyed but are <br /> believed to be sufficiently accurate for the purposes of <br /> this report. The monitoring wells, when drillef, will be <br /> { i atio <br /> ccnsaoflfheowelldh©ads w#11 be on a site <br /> map and the relative eleva- <br /> ± urate water table slope can be establfshedhed � that an <br /> Proposed Monitoring WsIl # i is located adjacent to the site <br /> from which the contaminated soil was removed and in the <br /> direction of probable water flow, Hells # 2 and # 3 will be <br /> located about 1401-150' southerly and westerly of # 1. These <br /> locations weze chosen so that all <br /> wells would e on <br /> Raymond Investment property, If waterecontam#nation bs found <br /> r at the # 1 well site, then at least one more well will <br /> necessary in a down-flow direction. , which will be deters <br /> mined from the three wells. <br /> Figure 5 is a t <br /> wells. A is type diagram for the proposed monitoring <br /> l will be bored"to.a. nominal size, hollow stem auger hole <br /> at least 20 feet intoothe aavater4tabbelowhground <br /> ever level , <br /> or to <br /> it is <br /> located. Truck mounted egttigment will be used,. 54 _ <br /> gallon <br /> drums with sealing covers will be on site to toll-s_ct_.auger__- <br /> cuttings andwater___if_the--wel-ls-are-baYled and samples <br /> --- -- ----_---collact ed prior to cementing - - -- - ? <br /> materials will be stored ongsiteewith tthe hexcavation ole. The �Spoil <br /> and will be properly disposed of after the operation is <br /> completed. The waterwill be din <br /> permission 4s grant posed of in the sewer if <br /> ad by the City of Manteca. The wells will <br /> be cased with 4 ttom screw jointed PVC. with the bo10' <br /> _p®rforatad with .02" slots and the surrounding well bore <br /> packed with # .3 sand or equivalent as a filter. A 21 to 50 <br /> 1 bentonite clay plug will Be placed above the perforations as <br /> r a protection from cementing operations. The upper 251 plus <br /> or minas annulus between the bore hole and the well casing <br /> j . g <br /> u <br /> ,:.',• 2 <br />