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PUBLIC HfALTH SERVICES ,oP _T­C' <br /> SAN JOAQUIN COUNTY r�A <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst M.D. M.P H. Health Oificer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 `'F <br /> 2091468-3420 <br /> JUN 2 9 2001 <br /> FREDERIC. CLARK <br /> CITY OF MANTECA <br /> 1001 W CENTER ST <br /> MANTECA CA 95336 <br /> RE: Manteca City Corporation Yard SITE CODE: 0690 <br /> 210 E. Wetmore Street <br /> Manteca CA 95336 <br /> San Joaquin County Public Health Services, Environmentall Health Division (PHS/EHD) has reviewed the <br /> Monitoring Well Installation and Quarterly Report— Second Quarter 2001 dated June 13, 2001 that was <br /> prepared on your behalf by Advanced GeoEnvironmental, Inc. (AGE) and has the following comments. ' <br /> The report documents site fieldwork that took place on April 5, 2001 when four shallow groundwater <br /> monitoring wells were installed. The wells were installed as part of the investigation of the vertical and <br /> lateral extent of the petroleum hydrocarbon contamination that was discovered at this site following the <br /> removal of three underground storage tanks in August 1999. Soil samples for analysis were collected <br /> during the advancement of the boreholes. The wells were developed on April 10, 2001, and groundwater <br /> samples for analysis were collected on April 13, 2001. <br /> As stated in the report, the soil analytical data collected to jate indicate that the vertical and lateral extent <br /> of the petroleum hydrocarbon impact to soil has been fairly d�well defined, with the exception of methyl <br /> tertiary butyl ether(MtBE) in the vicinity of monitoring well #4 (MW-4). The 20-foot below surface grade <br /> (bsg)soil sample from MW-4 had 1,200 milligrams per kilogram (mg/kg) MtBE, and the 25-foot bsg <br /> sample had 97 mg/kg. The groundwater samples were nod-detect for all constituents except for 53 <br /> micrograms per liter(lug/1)total petroleum hydrocarbons as diesel in MW-1 and 4,700 lug/I MtBE in MW-4. <br /> The report recommends additional monitoring wells and a boring to complete the assessment of the <br /> extent of the contamination at this site. PHS/EHD agrees with this recommendation. Please submit a <br /> work plan to complete the investigation of the vertical and lateral extent of the petroleum hydrocarbon <br /> contamination at this site to PHS/EHD by August 20, 2001.1 In addition, quarterly groundwater monitoring <br /> and sampling should continue until directed otherwise by P S/EHD. <br /> If you have any questions or comments please call Lori Duncan at(209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Gt <br /> Lori Duncan,Duncan, Senior REHS Dot Lofstrom R. G. <br /> LOP/Site Mitigation Unit IV Engineering Geologist <br /> cc: Marty Hartzell, CVRWQCB <br /> Brian Millman, AGE <br /> A Division of San Joaquin County Health Care Services <br />