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�a <br /> PUBLIC HEALTH SERVICES . <br /> SAN JOAQUIN COUNTY �' <br /> JOG KHANNA M.D.,M.P.H. <br /> Hnith Officer M <br /> P.O.Boa 2009•(I601 Eau Hazelton Avenue)9 Rocha CalUbmia 95201 ; X6 <br /> (209)468- <br /> APR 18 1991 _3r, <br /> JOHN R 2 ISM �S ((D)RUTHERFORD <br /> DESERT PETROLEUM INC �•�� v +�__,,� <br /> P0BOX 1601 J1 <br /> O,O;ARD CA 93032 <br /> I <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 h:-'.Xng time-LUFT Manual)and,therefore,cannot be honored. <br /> 2. The three (3) soil samples takes from the original tank excavation are not sufficient to <br /> define the soil contamination plume, or to verify that we does not exist <br /> 3. A—nonicoring 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 downgradient <br /> The vtx fied groundwater gradient has been documented at this site to be to the northeast <br /> 4. The soil results for the waste oil tank excavation snow levels of lead over 5.0 parte 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 fiuther. The <br /> recommended test for soluble lead is the waste extraction test using method 7421 (Tri- <br /> Regional Recommendations). <br /> i <br /> Further assessment at this site is needed. Please submit a work plan addressing the above mentioned items <br /> i <br /> by May 20, 1991. <br /> i <br /> If you have any questians, contact Linda Turkatte,EHS, at(209) 468-3442. <br /> i <br /> Jogi Khanna,M.D.,M.P.H. <br /> Health Office <br /> l <br /> i <br /> V lwrY I�r �/ <br /> ---- --— - une A-Ca a, ;Program Manager_... <br /> Environmental Health Division <br /> ? LAC/LT:nr <br /> Western Geo-Engineers-George Converse <br /> 1306 E.Beamer St.,Woodland,CA 95695-9603 <br />_ - _ A t)MUM of San jowq¢kn County Firallh Cue cervica OP - <br />