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HEALTH SERVICES �.P �o <br /> PUBLIC .� <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. :. <br /> Health Officer <br /> ea <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 4�/F6R <br /> (209)468-3400 <br /> TOM PORTELE <br /> GREYHOUND LINES INC l� ��Y 199 <br /> P O BOX 660362 _ <br /> DALLAS TX 75266-0362 l 1l <br /> RE: Greyhound Bus Terminal #8969 SITE CODE: 1041 <br /> 121 S. Center St. <br /> Stockton, CA 952011 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the <br /> recently submitted"Supplemental Site Assessment Report"dated March 1993 prepared by Engineering-Science <br /> and has the following comments. <br /> Soil borings (B-3, B-4, B-5, and B-6) sampled and analyzed for Total Petroleum Hydrocarbons as Diesel <br /> (TPHD) and Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) confirm no soil contamination exists at <br /> LUFT detection limits in the ground northeast,east and southeast of the tank pit at depths of 39-41 feet and <br /> 44-46 feet below grade only. <br /> PHS/EHD does not agree with conclusions that these borings were successful in defining the vertical and <br /> horizontal extent of subsurface soil contamination. <br /> In order to accurately define the extent and concentration of the soil contamination that still exists at the <br /> previous sampled locations (T-1, T-2, P-2, P-3, P-4, P-5, B-1 and B-2) future subsurface investigation shall <br /> include an adequate number of analyzed samples at consecutive five(5) foot depths from all quadrants around <br /> these sources. <br /> Once the size and contamination level of the soil still in place on site is determined, PHS/EHD will be <br /> prepared to review and evaluate any proposal for remediation. <br /> Any contaminated soil proposed to be left in place shall be evaluated by using the LUFT manual and the Tri <br /> Regional Guidelines. Depth to seasonal high groundwater, according to San Joaquin County Flood Control <br /> map, Spring 1986, is 20 feet below ground surface. This depth to groundwater will be used to evaluate if <br /> contaminated soil left in place may impact groundwater in the future. <br /> Please direct your inquires to Michael Infurna, Senior REHS, of my staff at (209) 468-3454. <br /> Jogi Khanna, , M.P.H. <br /> Health Offi r <br /> AeG/i✓h� 1 <br /> Laurie A- Cotulla, REHS, Program Manager <br /> 'Environmental Health Division <br /> LAC/MI:Ib <br /> c: Engineering-Science c: SWRCB - Susan Phillips <br /> c: CVRWQCB - Elizabeth Thayer <br /> A Division of San Joaquin County Health Care Services <br />