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DUDEK & ASSOCIATES, INC. Corporate Office: Corona Office: 605 Third Street 1180 Olympic,Suite 202 Encinitas,CA 92024 Corona,CA 91719 Engineering Environmental Sciences (619)942.5147 (909)270.3177 Fax (619)632-0164 Fax (909) 270-3180 July 25, 1995 736-01 Mr. Harlin Knoll San Joaquin County Public Health Division Environmental Health Division 445 North San Joaquin P.O. Box 2009 Stockton, CA 95201 Re: Application for Permit to Construct One Monitor Well South of East Main Street on Private Property Dear Mr. Knoll: The Regional Water Quality Control Board(RWQCB)has been concerned about chromium detected in groundwater samples from domestic and irrigation wells south of East Main Street. The RWQCB has also requested that the Marley Cooling Tower Company(Marley)construct a monitor well south of East Main Street to determine the southeast extent of total dissolved chromium migration in the Intermediate Zone. Enclosed, please find one application (completed in triplicate) to construct this monitor well on the private property of Mr. Jim Solari. The RWQCB contacted Mr. Solari in November 1994 regarding property access. Dudek personnel contacted Mr. Solari on May 15, 1995 and received verbal approval to construct a monitor well on the southernmost portion of his property adjacent to the Mormon Slough. Well Construction Once the permit has been issued,an exploratory borehole and monitor well will be constructed along the north side of the Mormon Slough roughly midway between monitor wells MW-431, on Sinclair Avenue, and MW-443, on Walker Lane (Figure 1). The exploratory borehole will provide the information necessary to determine the screened interval for the monitor well. Both the exploratory borehole and monitor well will be constructed using mud rotary drilling techniques. The exploratory borehole will be drilled to approximately 250 feet below land surface (bls) and electrically logged to determine the completion interval. The monitor well will be completed next to the exploratory borehole location with 4-inch inside diameter PVC pipe. A screened interval of no more than 20 feet will be used to complete the monitor well,in accordance with prior agreements between Marley, California Department of Toxic Substances Control, and the RWQCB. The exact length of screened interval will depend upon field conditions (Figure 2). It is anticipated that the well will be completed between 140 and 180 feet bls depending upon the occurrence of the most ro 4a