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-4- <br /> { PUBL HEALTHY a�lN <br /> SER <br /> ). •.O <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA MD.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 6)i i5R�\P <br /> (209) 46&3400 <br /> JUL 0 5 1991 ❑ <br /> 1 LON KITAGAWA ; <br /> l B P CHEMICALS <br /> 3437 S AIRPORT f <br /> f STOMON CA 95206 <br /> i; <br /> RE: B. P. Chemicals IN REPLY REFER TO SITE CODE: 2042 <br /> 3437 S. Airport <br /> Stockton, CA <br /> We have completed our review of the Tank Re-excavation Soil Sample iAnalyses and Proposed Further <br /> Excavation dated June 21, 1991 prepared by Weston for the above referenced site. <br /> I� <br /> The work plan states that analytical results of the soil samples will be compared to the LUFT Manual <br /> allowable levels. The Leaching Potential Analysis in the LUFT Manual is based on site specific <br /> characteristics. The first of which is minimum depth to groundwater from the soil sample. Depth to <br /> groundwater is based on seasonal hi ground water. <br /> gr high gr In 1986, seasonal high groundwater at this site was <br /> 25 to 30 feet. Thus,no points are allowed for this characteristic. A copy of,the leaching potential analysis <br /> and the scoring for this site is enclosed. We would not concur witha closure recommendation unless all <br /> soil samples above 20 feet are non-detect for BTXE and below 10 ppm.TPH-g using the detection limits listed <br /> in Table 3-5 of the LUFT Manual. Since B, T, X, E, or TPH-g were present in each of the previous soil <br /> samples, re-excavation and resampling of the entire tank pit should be done to show that all contaminants <br /> have been removed. j <br /> If you have any questions contact Margaret Lagorio, Senior REHS, at(209)468-3449. <br /> ogi Khanna, M.D., M.P.H. ;{ <br /> if <br /> Officer <br /> Laurie A. Cotulla, REHS, Pro am Manager <br /> Environmental Health Division <br /> LAC/ML:nr # <br /> a <br /> enc. �} <br /> i <br /> c: Weston �} <br /> 83 W. March Lane, Ste. 12 <br /> Stockton, CA 95207 3'# <br /> 1, <br /> i� <br /> IJ <br /> A Division of San Joaquin County Health Care Serviccsi <br /> IL <br />