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California Regional Water Quality Pontrol Board f, - <br /> Central Valley Region <br /> Steven T.Butler,Chair ?' <br /> Winston H. Hickox GraN, Davis <br /> Secretaryfor Sacramento Main Office Goterno <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827- 03 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> F r <br /> 16 May 2000 MAY 1.7 2000 <br /> Mr. Doug Stidham, City Engineer t NVil=lUiWl~NTAL'- HEALTH <br /> City of Escalon <br /> PERMIT/SERVICES <br /> 1854 Main Street <br /> Escalon, CA 95320 <br /> CONDITIONAL APPROVAL OF GROUNDWATER MONITORING WORKPLAN, CITY OF <br /> ESCALON WASTEWATER TREATMENT PLANT, SAN JOA QUIN COUNTY <br /> I have reviewed the "Monitoring Well Installation Workplan, City of Escalon Waste Water Treatment <br /> Plant, "prepared by Geological Technics, Inc., dated 2 May 2000. The plan was prepared in response to <br /> Regional Water Board correspondence dated 17 April 2000 requesting the City of Escalon to improve <br /> the groundwater monitoring network at the City owned wastewater treatment plant. After reviewing the <br /> workplan, I have the following comments: <br /> • No discussion of groundwater flow direction is provided. Please review the available data to <br /> confirm a westerly groundwater flow direction. <br /> • Based on the available information on the groundwater flow direction, the proposed location of <br /> Well MW-7 does not appear to be downgradient of any of the ponds and Well MW-6 is <br /> downgradient of only Pond 12/20. Please relocate Well MW-7 to a location west of Pond No. 2; <br /> move MW-5 to a location west of Pond 14/17; and move Well MW-6 to a location near the <br /> southwest corner of Pond 19. <br /> • Add a groundwater monitoring well to the location west of Pond 8. <br /> The workplan is approved on the condition that the above comments are addressed in an addendum letter <br /> to be submitted by 24 May 2000. If you have any questions on this conditional approval, please <br /> telephone me at (916) 255-3116. <br /> TIMOTHY R. O'BRIEN <br /> Waste Discharge to Land Unit <br /> San Joaquin River Watershed <br /> cc: Mr. Mike Huggins, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Raynold Kablanow, Ph.D., Geological Technics, Modesto <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />