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Ph.D <br /> �� •HARGIS+ASSOCIATES INCO David l .Long, R.G. R.G. <br /> r_ Michael R.Long,R.G. <br /> Terry M.Turner,R.G. <br /> 2223 Avenida De La Playa,Suite 300 Roger A.Niemeyer,R.G. <br /> Leo S.Leonhart,Ph.D.,R.G. <br /> La Jolla, California 92037 Lanae J.Raymond <br /> (619) 454-0165 Peter T.Quinlan <br /> Telecopier(619)454-5639 J.D.Mohrbacher,P.E. <br /> Christopher G.A.Ross,R.G. <br /> .si. <br /> -.To [,t; <br /> �'p�' '" zi � is <br /> April 29, 1991 e <br /> MAYMs. Eleanor <br /> 6 19q� <br /> SAN JOAQUIN COUNTYfPUBLIC HEALTH SERVICES'RMIT/SERV CF5 TN <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Scope of Work for Monitor Well Construction in the Vicinity <br /> of the Marley Cooling Tower Company, Stockton, California <br /> Dear Ms. Ratliff: <br /> Hargis + Associates, Inc. (H+A) is conducting a continuing groundwater <br /> assessment for the Marley Cooling Tower Company (MCTC) in accordance with the <br /> Settlement Agreement and Schedule of Compliance in Case No. CAD0091040120 <br /> executed by the California Department of Health Services, the Central Valley <br /> Regional Water Quality Control Board, and MCTC. The groundwater assessment scope <br /> of work in the vicinity of the MCTC facility in, Stockton, California consists <br /> of drilling and construction of as many as three exploratory boreholes and <br /> monitor wells and two reclamation wells. Drilling is scheduled to commence on <br /> or about May 6, 1991. <br /> The three monitor wells and exploratory boreholes are proposed to assist <br /> in defining the downgradient extent of total dissolved chromium in the <br /> groundwater. Initially, one monitor well will be constructed on Walker Lane <br /> approximately 1100 feet south of Main Street. If groundwater samples from this <br /> newly constructed monitor well contain total dissolved chromium, then two <br /> additional monitor wells will be constructed on Walker Lane. One approximately <br /> 250 foot exploratory boring will be drilled adjacent to all monitor well <br /> locations on Walker Lane prior to well construction. <br /> Two reclamation wells were proposed in the February 4, 1991 Revised <br /> Remedial Wellfield Design Report. The two reclamation wells will be constructed <br /> on Horner Avenue approximately 100 feet west of Gertrude Avenue and on Sinclair <br /> Avenue approximately 800 feet south of Washington Street. These reclamation <br /> wells were identified in the February 4, 1991 report as reclamation wells S-4 and <br /> S-6, respectively. <br /> Exploratory borehole and well construction details are as follows: <br /> The 6-inch diameter exploratory boreholes to 250 feet in depth will <br /> be drilled using conventional mud rotary equipment. The boreholes will be <br /> geophysically logged once drilling has been advanced to total depth. <br /> Exploratory boreholes will be abandoned with neat cement. Neat cement will <br /> Other Offices: <br /> Tucson,AZ <br /> Mesa,AZ <br /> Manhattan Beach,CA <br /> Burbank,CA <br />