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BOARD OF TRUSTEES SAN JOAQUIN LOCAL HEALTH DISTRICT SERVING <br /> James Culbertson,Pres. City of Lodi <br /> Mary Anna Love,Vice Pres. 1601 East Hazelton Avenue, P.O. Box 2009 San Joaquin County <br /> Patricia E.Vannucci,Sec'y. San Joaquin County <br /> Tommy Joyce Stockton, California 95201 City of Escalon <br /> Earl Pimentel City of Manteca <br /> Virginia Mathews (209) 466-6781 City of Ripon <br /> Daniel L.Flores City of Stockton <br /> John D.Mast,M.D. Jogi Khanna,M.D.,M.P.H.,District Health OHfcer Cfty of Tracy <br /> San Joaquin County <br /> February 22 , 1988 <br /> Tom Gau <br /> San Joaquin Public Works Department <br /> 1810 E. Hazelton <br /> Stockton, CA <br /> Re: Storm Pond Proposal , Hempstead Court <br /> The proposal presented by Mid-Valley Engineering to drill "Dry Wells" <br /> for storm water drainage to a depth of 40 feet is unacceptable. The <br /> maximum depth a "dry well" can be drilled in San Joaquin County is <br /> 25 feet or 10 feet above the ground water table, whichever is closer . <br /> The reason for this requirement is water wells drilled in San Joaquin <br /> County require a minimum of a 50 foot grout seal to protect the <br /> ground water tables from contamination. Introducing surface drainage <br /> water which may be contaminated, into ground water stratas is not <br /> acceptable. In addition pentration through a perched water table by <br /> a "dry well" has the potential of draining poor quality water from the <br /> perched table into the static water acquifers below. <br /> The Health District recommends that the maximum depth of the storm <br /> ponds , including any dry wells , conform to the California Regional <br /> Water Quality Control Board requirements of three feet above the perched <br /> water table . <br /> Should you have any questions , please contact Fred Kaufman, Supervising <br /> Sanitarian, at ( 209 ) 468-3426 . <br /> Jogi Khanna, M. D. , MPH <br /> District Health Officer <br /> /Ro /al1noti , Director <br /> Environmental health Division <br /> RV/I K : ss <br /> T1 D <br />