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� T <br /> PUBLIC HtALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> PY <br /> JESS CERVANTES C(O <br /> P O BOX 6008 <br /> STOCKTON CA 95206--0008 MAR 16 2000 <br /> RE: JC -trucking SITE CODE: 2571 <br /> 1207 S Aurora Street <br /> Stockton CA 95206 <br /> San Joaquin County Public Health Services, Environmental Health Division, (PHSIEHD) <br /> has reviewed the "Groundwater Monitoring Well Installation and Quarterly groundwater <br /> Monitoring Report" dated November 30, 1999 that was prepared by P.C. -toxics"and <br /> JJW Geosciences, Inc. (JJW) on behalf of the above site and has the following <br /> comments. The report was received by PHSiEHD on January 20, 200-0. <br /> The report documents the August 1999 installation of two deep monitorir"ig ��ve'Is,"DM�JV 7 <br /> and L MW­8 to 110-feet below surface grade, the analysis of.selected soil sample <br /> collected during the drilling of the well borings. and the vieli development and <br /> groundwater moi dtoring event wh!& tc'ok glace on September '10. 1999. . <br /> Results of the soil sample analyses indicate that petroleum hydrocarbon contamination: <br /> in soil extends to above 80-feet below surface grade (bsg) in DMW-7, and to at least 75- " <br /> feet bsg in DMW-8. These results are somewhat inconsistent with the observations <br /> made during drilling, when hydrocarbon odors were noticeable to at least 90-feet bsg. <br /> Results of the groundwater monitoring sarnple analyses show that significant shallow . <br /> groundwater contamination remains in the areas of the former tank pits, and that it has <br /> not been defined laterally to the west or in the down-gradient direction towards the <br /> southeast. Contaminant concentrations in MW-2, which is located in the former gasoline <br /> tank pit area, include 56,000 parts per billion (ppb) total petroleum hydrocarbons as gas <br /> (TPHg), 160-ppb methyl tertiary butyl ether (MtBE), 8,200-ppb benzene, 23,000-ppb <br /> toluene, 550-ppb 1,2-dichlor,oethane (11,2-DCA), 860-ppb 1,2-dibromoethane (EDB) and <br /> 280-ppb tertiary butyl alcohol (TBA). Results from the new deep wells indicate that the <br /> vertical extent of the groundwater contamination has not been defined, nor has the <br /> lateral extent at this depth. Contaminants of concern at depth include TPHg, benzene, <br /> 1,2-DCA, EDB and some very high levels of ethanol (120,000-ppb in DMW-7 and 6,900- <br /> ppb in DMW-8). <br /> A Division of San Joaquin County Health Care Services <br />