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HEALTH SERVICES <br /> PUBL'IC <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.:M.P.H. <br /> Health Officer <br /> P.O. Box 2009•(1601 Eget'Hazehon Avenin)6 StOdd0n,CaUbmia 95201 �tFK �A <br /> (209)466-3400 <br /> ixQ <br /> CHARLES LWBNER <br /> STOCKTON UNIFIED SCHOOL DISTRICT NOV 2 7 1991 <br /> 7011 N MADISON <br /> STOCKTON CA 93202 <br /> RE: Franklin High School IN REPLY REFER TO SITE CObEs_ 1578 <br /> 300 N. Gertrude, Stockton <br /> subsurface investigation <br /> We have reviewed the October 10, 1991 Preliminary Site Assessment <br /> submitted by Helmick & ternerr Inci The report presents <br /> information gathered from drilling and; sampling sail from three <br /> borings. Hydrocarbon contaHination Nae detetcteed in soil boring 01 <br /> to a depth of 50 feet. The boring fiat terminated at that depth. <br /> Your consultant has proposed to treat they contaminated soil to A <br /> depth of 20 feet .either ihr-gita via vapor wttraotion, or est-reit <br /> via excavation and aeration, Contamination deeper than :2o feet *AS <br /> proposed to be left in place Without treatment. <br /> San Joaquin county Public Health Services# 8nvironmental Health <br /> Division has the following 600SO"itSt <br /> 1. The extentof thevertical migration of hydrocarbon <br /> contamination is not, known,. Residual benzene and toluene <br /> (20 ppb and 13 ppbj ketpe Ctive ly) is present at so feat .Y <br /> below ground surface Seasonal high groundwater was , <br /> recorded at approximately 60 feet in the spring of 1986. <br /> with historic groundwater .levold at this depth, it may be <br /> necessary to rofte:diate all Contaminated Soil and <br /> investigate the possibility of hydrocarbon contamination <br /> in groundwater. <br /> 2. uncontrolled aeration of contaminated soil is prohibited <br /> in San Joaquin County, Permits for controlled treatment <br /> systems must be obtained from the San Joaquin Valley <br /> unified Air Pollution control district. <br /> 4 <br /> A Division of can Joaquin County Health Care Services �� <br />