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Eastside Winery,Lodi • 0 <br /> Addendum to Monitoring Well Installation Workplan <br /> 27 July 2000 <br /> Mr. Timothy R. O'Brien <br /> Sacramento Valley Regional Water Quality Control Board <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3003 <br /> ADDENDUM TO GROUNDWATER MONITORING WORKPLAN FOR EAST <br /> SIDE WINERY,LODI, SAN JOAQUIN COUNTY <br /> I have prepared this addendum to the groundwater monitoring workplan in accordance <br /> with your comments of 17 July 2000. <br /> We now propose three monitoring wells per the attached figure. The groundwater <br /> gradient will be computed from depths to water measured in these three wells. After <br /> determining the gradient in four successive quarters additional well(s)may be <br /> recommended if these are found unsuitable for detecting groundwater impacts of the <br /> disposal ponds. <br /> Bentonite added to the grout mix will be at least 3 percent by weight but less than 5 <br /> percent to assure the grout will not shrink excessively. All grout will be placed with a <br /> tremie pipe. <br /> Development of the wells will not occur until more than 24 hours after the grout has been <br /> placed. <br /> Groundwater will be analyzed for the parameters specified in Monitoring Program 58- <br /> 539. <br /> Monitoring well permits will be obtained from the San Joaquin County Environmental <br /> Health Department. <br /> The sand pack will be surged prior to placing the bentonite seal. <br /> The screened intervals of the wells will cover the first saturated interval. They will not <br /> begin less than 6 feet beneath the existing ground surface. They will not bridge two <br /> apparently separate hydrologic units. They will be long enough so that they we can <br /> reasonably expect them to intersect water even during low water table conditions. During <br /> high water table conditions the water table is likely to be higher than the top of the <br /> perforated interval. <br /> Threaded casing will be used throughout. <br /> 1 <br />