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1 <br /> SE ICESPUB C HEALTH �-.. <br /> SAN JOAQUIN COUNTY <br /> )OGI KHANNA M.D.,M.P.14 +. ;• <br /> Health Officer '► <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) 0 Stockton,California 95201 <br /> '�tii�li'k♦� .' <br /> (209)468-3400 <br /> cooFly <br /> CHARLES LEt1BNER NOV 2 7 1991 <br /> STOCKTON puirim SCHOOL DISTRICT <br /> 7011 N 14ADISON <br /> STOCKTON CA 55202 <br /> RE: Franklin High School IN REPLY RZPZR, TO SITE CODE!- 1578 <br /> 300 N. Gertrude, Stockton + <br /> subsurface Investigation <br /> we have reviewed the October 10o 1891 iPr*liuinaty site Assessment .j <br /> submitted by Helmick & Lerner# Ino. The report presents <br /> information gathered from drilling and, sampling soil from three <br /> borings. Hydrocarbon contAtination was detected in soil boring 01 <br /> to a depth of 50 feet. The boring was terminated at that depth. <br /> Your consultant has proposed to treat the contaminated soil to a <br /> depth of 20 feet either in-Sit* via vapor dxtr&dt Oft# or ex-site <br /> via excavation and aeration. COUtamination deeper than 20 feet vias <br /> proposed to be left in plane without treatment, <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division has the following co=bfitssfls <br /> 1. The extent of the Vertical Migration of hydrocarbon <br /> contakitt6ti6n is not known, Residual b6nzend and toluene <br /> (20 ppb and 13 ppb, r6sp66tiv6ly) is present at 50 feet <br /> belowgtound outface beasonal high groundwater was <br /> recorded at appt0Xifalately e0 feet in the spring of 1956+ <br /> With historic gr6undwat6r levels at this depths it >>uay be <br /> necessary to resediate all contaminated soil and <br /> investigate the possibility ity of hydrocarbon oontAttination <br /> in groundwater. <br /> 2. Uncontrolled aeration of oonta*inated soil is prohibited <br /> in Bali Joaquin county: parfaits for controlled ttSat*tnt <br /> system suet be obtained from the San Joaquin 'valley <br /> Unified Air pollutioh Control District# <br /> A Division of San Joaquin C;(wnty Heakh Care SeMc". <br />