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NNl HYDRO•SERRCH, inn. <br /> M:;J"T0J$41.1rklch Company <br /> t�E 'IT SER CE <br /> 95 AUG -8 AM il: 50 <br /> July 15, 1996 <br /> C AMAINTIVIM5042\W ELLD EST.LTR <br /> Mr. Harlin Knoll <br /> Environmental Health Specialist <br /> San Joaquin Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject: Well Abandonments at FMC's FranRica Manufacturing Site, Stockton. <br /> Dear Mr. Knoll, <br /> Hydro-Search, Inc. (HSI), working on behalf of FMC Corporation, has completed <br /> abandoning three monitor wells and one unused water supply well at FranRica <br /> Manufacturing, 2807 and 2829 South Highway 99, Stockton, California. <br /> The three monitor wells were installed by HSI in August 1995 as part of a Phase II <br /> site assessment, and the unused water supply well (noted as the "capped well" on <br /> site maps) existed from previous land use at the property. Installation and <br /> sampling of the monitor and capped wells is described in the "Report of Findings, <br /> Phase 11 Environmental Site Assessment FR Manufacturing Corporation" by HSI, <br /> dated September 19, 1995 and in the "Excavation and Disposal of Hydrocarbon- <br /> Impacted Soils and Groundwater Monitoring at FR Manufacturing Corporation" by <br /> HSI, dated April 1996. Groundwater samples were collected from these wells on <br /> two occasions and analyzed for total petroleum hydrocarbons as diesel (TPH-D). <br /> Abandonment of the wells was recommended in the April 1996 report because <br /> significant concentrations of TPH-D were not detected in the groundwater <br /> samples. <br /> The wells were abandoned on June 26, 1996 by Gregg Drilling Company, a <br /> licensed well contractor. The wells were abandoned by pumping Type 1/II Portland <br /> neat cement (with approximately two percent bentonite) through a tremie pipe and <br /> filling the well and gravel pack from the bottom of the well to the surface. Once <br /> the cement in the wells had cured for approximately one hour, the top five feet of <br /> each well was drilled out with an eight-inch auger and capped with concrete. The <br /> holes were then backfilled with native materials. Wells in paved parking areas <br /> were capped with concrete or asphalt patch. <br /> The table below presents the estimated volume of each well casing and filter pack <br /> and the actual volume of cement used to abandon each well. The actual volume of <br /> cement used in each well was determined by multiplying the volume of dry cement <br /> used by 1 .4 cubic feet (Driscoll, 1987)• The actual volume of cement pumped into <br /> 3035 Prospect Park Drive,Suite 40,Rancho Cordova,California 95670 Telephone(916)853-1800 Facsimile(916)853-1860 <br />