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• 0 <br />k"KLEI N FELDER <br />April 20, 1993 <br />File: 24-215600-F02 <br />Mr. Fred Kaufman, Program Manager <br />Environmental Health Division <br />Public Health Services <br />San Joaquin County <br />P.O. Box 2009 <br />Stockton, California 95201 <br />Subject: Cove Contractors <br />Dear Mr. Kaufman: <br />The following information is provided in response to your letter dated March 8, 1993, and <br />discussions held during the March 4 site visit by Steven Sasson and Ed Padilla or your staff, <br />Jack Hecht of Cove Contractors, and Tim Crandall and Steven Duran of Kleinfelder. This <br />letter and the accompanying drawings describe the interim drainage plan that will be <br />implemented at the site until landfill activities resume. <br />Enclosed, please find the following five drawings submitted for your evaluation and approval: <br />■ Drawing 1- Cove Contractors Disposal Site <br />Existing Site Topography and Features <br />• Drawing 2 - Cove Contractors Disposal Site <br />Grading for Drainage <br />■ Drawing 3 - Cove Contractors Disposal Site <br />12 Inch Cover Grade <br />■ Drawing 4 - Cove Contractors Disposal Site <br />Cross Sections North - South <br />■ Drawing 5 - Cove Contractors Disposal Site <br />Cross Sections West - East <br />Also enclosed are engineering calculations for run-off from a 10 year, 24 hour, storm event <br />for the Cove Contractors site. These calculations indicate an approximate run-off flow rate of <br />0.25 cfs. This results in a 24 hour total run-off volume for the site of approximately 21,000 <br />cubic feet. <br />Drawing 1 is similar to Drawing 1 submitted with the Report of Disposal Site Information <br />(RDSI) for the facility, showing the existing site. <br />Drawing 2 shows the proposed regrading of the existing surface material on the northern half <br />of the site. This regrading will direct drainage in this area to the existing excavation on the <br />north end of the property. This regrading of the site will also mitigate historical situations <br />where run-off from the site accumulated above areas of refuse disposal. Drainage will be <br />CLI -60 (1993) Page 1 of 3 24-215600-F02 <br />Copy1�ri ht 1993 Kleinf lder, Inc. <br />KLEINFELUE� 3077 Fite Circe, Sacramento, CA 95827 (916) 366-1701 <br />