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7 _ PUBLIC HSERVICES a . <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.R.M.P.h. <br /> Health Officer <br /> P.O.Sax 2009 a(1601 Ent Hazelt0a Aeeuue)•Sto&ota,tisl bmta 95201 <br /> (209)46& # <br /> APR 18 1991 Flyr <br /> ,JOHN RUTHERFORD <br /> DESERT PETROLEUM INC <br /> P0BOX 1601 - <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,M'yV 2.17 and MW 3-15 were held over 14 days <br /> (maximum holding time - LUFT Manual) and,therefore, cannot be honured. <br /> 2. The ttu," (3) soil samples taken from the original tank excavation are not sufficient to <br /> l ` <br /> define the soil contamination plume, or to verify that one does not exist. <br /> 3. A monitoring well will need to be installed in the verified downgradient direction of the <br /> former tank location in order to determine if contamination has migrated downgradienL <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 S.0 parts per <br /> million (ppm), the soluble threshold limit concentration (Title 22, Code of California <br /> Regulations). These high levels of lead will need to be investigated further. The <br /> recommended test for soluble lead is the waste extraction test using method 7421 (Tri- <br /> Regional Recommendations). <br /> Further assessmenr ar 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 /> _ r <br /> urie A. Cotul aa, LIS,Program Manager <br /> Environmental Health Division <br /> LAC/LT:rir <br /> Westem Geo-Engineers - George Converse <br /> 1386 E. Beamer St., Woodland, CA 95695-9603 <br /> A"On of San Joaquin Courcy Heath Care Services <br />