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IBM4. I <br /> � Ag.. <br /> r + - .a <br /> 1 <br /> - PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> JOGI KH.INNA KD..KRH. ;. <br /> Hedth 0ffcer <br /> P.O.Box 2009 0(1601 East ttzxeltae Avwue)®seadaoo.CUlfornia 95201 rkts�a <br /> ~, <br /> (209)46&5dm <br /> APR 18 1991 <br /> JOHN RUTfMRFORD <br /> DESERT PETROLEUM INC g '�' -• <br /> P0BOX 1601 ` J <br /> OXNARD CA 93032 �� • <br /> RE: Desert Petroleum,Inc. '� IN REPLY REFER TO SITE CODE: 1401 <br /> 950 W.Eleventh St. <br /> Tracy, CA <br /> The Request for Site Closure Report dated February 25, 1991,has been reviewed by Public Health Services, <br /> Environmental Health Division(PHS/EHD). <br /> Closure at this site cannot be recommended for the following reasons: - <br /> 1. Soil boring samples taken from MW 1-15,MW 2-17 and MW 3-15 were held over 14 days <br /> (maximum Voiding time-LUFT Manual) and,therefore,can,•rot be honored. <br /> 2. The three (3) soil samples taken from the original tank excavation are not sufficient to <br /> define the soil contamination plume,or to verify that gne does not exist <br /> 3. A monitoring well will need to be installed in the verified downgradienr direction of the <br /> former tank Iocation in order to determine if contamination has migrated downgradient. <br /> The verified groundwater gradient has been documented at this site to be to the northeast. <br /> 4. The soil results for the waste oil tank excavation show levels of lead over 5.0 parts per <br /> million (ppm), the soluble threshold limit concentration (Title 22, Code o7 California <br /> Regulations). These high levels of lead will need to be investigated farther. The . <br /> - recommended rest for soluble lead is the waste extraction test using method 7421 Crri- <br /> Rrgional Recommendations). <br /> Further assessment at this site is needed. Please submit a work plan addressing the above mentioned items <br /> by May 20, 1991. <br /> If you have any questions, contact Linda Turkarte,EHS,at(209)468-3442. <br /> Jogi Khanna,M.D.,M.P.H. <br /> Health Office <br /> uric A Cotuf a, S,Program Manager <br /> Environmental Health Division <br /> - LAC/LT:nr <br /> r <br /> Western Geo-Engineers.George Converse -- ----- -- -- --- --- <br /> 1386 E.Beamer Sr.,Woodland, CA 95695-9503 <br /> - - - . - A DtvWan of Smn joaq=Cwjnty Hnlch Cut hu"Ca <br /> BE <br /> � TO T��wtH� <br /> IMPROVED <br /> ■����K awe' 11 lli,A A-1R�a--+p.� - - <br />