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PUBLIC H ALTH SERVIaS <br /> 0?y <br /> aPputN c <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst,M.D., kP.H., Health Officer <br /> ., 304:East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209146873420' <br /> i <br /> ,BOE TosTE R JUL 12 2000 <br /> o$TE :FARMS INC. <br /> 248`0 TOSTE ROAD: <br /> TRACY CA. 9'5:37.6 7. <br /> RE:1 Curtiss Pontiac-Cadillac S T=,:C 1,877 <br /> 2460 Toste Road <br /> . <br /> . ........ ...... <br /> San Joaquin.County Public Health Services, Environmental Health Division, (PHSIEHD)has reviewed the <br /> "Quarterly Report:-.:December 199V dated Pebruary 14,2000, and the"Quarterly Report-First Quarter <br /> 2000"dated May 30,2000, that were submitted by Advanced GeoEnvironmental, Inc. (AGE)ori behalf of the <br /> above referenced site and has the following comments. <br /> In November 1999 six soil probe borings and two additional groundwater-monitoring wells were installed on ; <br /> site. Soil samples for analysis were collected during the drilling,grab-groundwater samples were collected <br /> from three of the probe borings and on December 7, 1999 the new wells were sampled at a routine quarterly <br /> monitoring event. Results of these and prior analyses indicate that the majority of the petroleum <br /> hydrocarbon impact to soil resides at depths above 10-feet below surface grade(bsg),extends no further <br /> that 24-feet bsg,and appears to be defined laterally: Results of the groundwater analyses indicate that the <br /> shallow contaminant plume has been defined laterally by MW-2, MVV-3, MVV-6, and MW-5,and by MW-3 on <br /> the adjacent property(2420 Grantline Road). The vertical extent of the groundwater contamination does not <br /> appear to have been defined, nor the lateral extent of the deeper groundwater contaminant plume. Quarterly <br /> groundwater monitoring should continue at this site until further directed by PHS/EHD. The depth to water <br /> (DTW)in the deep monitoring well, MW-7, has been approximately 2-feet deeper than the DTVII in the <br /> shallow monitoring wells,which may be indication of a vertical downward gradient at this site As routine' i <br /> monitoring continues,trends in the contaminant levels of the deep plume can be evalua#ed and decisions- <br /> about the need for furthornvestigation cani be made. <br /> Four soil samples Were su.timitted for physiochemical analysis and microbiological enurri'erabon;: Results of. <br /> these studies indipe.. that:petroleum bio-degrading microbe activity was low at this site;probably for.a. <br /> combination::t�f reasons: As ger the California Cade of Rogulation ;Title 23j, <br /> Division 3, Chapter 1. Section <br /> 2725(f),e feasibility study must be completed far this site. The study should evaluate alternatives for <br /> remedying or mitigating the actual or potential adverse effects of the unauthorized release. Submit the study <br /> to PHSIEHD by September 1 2000. <br /> If you have any:questions or comments call please Lori Duncan at(209)458-0337,. <br /> Donna Heran, REHS;.Dir Ct <br /> Effrnvirdnrrietntal Health.Divisidh <br /> E <br /> Lon.Duncan, SenMararor RENS g 9 o, Rs <br /> LOPISite Mitigation Unit IV Supervisor, Unit IV <br /> cc: Marty Hartzell,CVRWQCB <br /> Bill Little,AGE <br /> A DiVhAbn of SAft jo oin County Health,Cafe Services <br /> r <br />