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PUBLIC HEALTH SERVICES �. <br /> SAN JOAQUIN COM <br /> .r <br /> ]OG[KHANNA M.D.,M.P.H. : <br /> Hnith Officer <br /> P.O.Boa 2009•(1601 a Hazelton Avam)•3todam COfta is 95201 <br /> ( )4" <br /> APR 18 1991 <br /> (0)Py <br /> JOHN ItuTHgRI=oRD <br /> DESERT PETROLEUM INC ��� ✓' <br /> P 0 BOX 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 revitwed by Public Health Services, <br /> Environmental Health Division (PHS/M-m). <br /> Closure at this site cannot be recommended for the following reasons: <br /> I. Soil boring samples taken.from MW 1-15,MW 2-17 and MW 3.15 were held over 14 days <br /> (maximum holding time-LUT Manual)and therefore cannot be honored. j <br /> 2. The three (3) soil samples taken from the original tank excavation are not sufficient to <br /> ate; define the soil contamination plume.or to verify that one does not exist <br /> 3. A monitoringwell will need to be installed in the verified down dlent direction of the <br /> .gra <br /> former tank location in order to determine if contamination has migrated downgradient. <br /> The verified groundwater gradient has been documented at this site to be to the northea$L <br /> - i <br /> =j 4. The soil results for the waote oil tank excavation show levels of lead over 5.0 parts per <br /> r million (ppm), the soluble threshold limit concentration (Title 22, Cade of California <br /> Regulations). These high levels of lead will need til be investigated huther. The <br /> recommended test for soluble <br /> lead is the was ta extraction d n test usingmethod 21 <br /> 74 ri- <br /> (T .} <br /> Re ional Recommendations). <br /> (Tri- <br /> Regional <br /> Further assessment at this site is needed. Please submit a workplan addressing the above mentioned items <br /> P g <br /> by May 20, 1991. <br /> If you have any questions, contact Linda Turkatte,EHS,at (209)468.3442. <br /> Jogi Khanna,M.D.,M.P.H. <br /> Health OfFic <br /> aC/L <br /> A. Cotul a, S,Program Manager <br /> Environmental Health Division <br /> LAT,nr <br /> Westem Geo-Engineers-George Converse <br /> 138.6 E. Beamer St.,Woodland,CA 95695-9603 <br /> A Division or San Josqum County Health cue wr Wcs J <br /> ' Aw., C <br /> TO 11 E <br /> 4 <br /> COMITI o1 Or THE ORIGINAL <br />