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PUBLIC HEALTH SERVICES OP�uIM C <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. ` <br /> Health Officer <br /> oR�!F o•pa�P <br /> P.O. Box 2009 . (1601 East Hazelton Avenue) . Stockton, California 95201 <br /> (209) 468-3400 <br /> October 25, 1990 <br /> Don Lewis, Vice President <br /> Interland Corporation <br /> 1477 Drew St. <br /> Davis, CA 95616 <br /> RE: 8715 W. Grantline Rd. IN REPLY REFER TO SITE CODE: 2287 <br /> Tracy, CA <br /> The reports entitled "Soil Excavation and Aeration for Interland <br /> Corporation" dated October 19, 1990 and "Soil and Groundwater <br /> Investigation for Orchard Supply Hardware" dated June 7 , 1990, <br /> combined, satisfy the investigative definition of a Preliminary <br /> Report and a Soil Remediation Proposal. (Appendix A, Tri-Regional <br /> Recommendations, April 3 , 1989, revision. ) Soil removed during the <br /> July 23 , 1990 excavation and aerated for placement back into the <br /> excavation pit appears to have been the most cost effective <br /> remediation procedure for this site. <br /> Residual volatile hydrocarbon contaminants remain in the excavation <br /> at sampling point: <br /> ME-1 23 ppb toluene <br /> 83 ppb ethylbenzene <br /> . 3 ppm xylenes <br /> 150 ppm THP--gasoline <br /> 1, 100 ppm oil and grease <br /> MN-2 Results for 418 . 1 were not included in Table 3 <br /> The residual contaminants left in place at the soil/groundwater <br /> interface must be addressed during the Problem Assessment Report <br /> (PAR) . Site certification can only occur when determination has <br /> been made by Public Health Services, Environmental Health Division <br /> (PHS/EHD) and Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) that the residual contaminants will not pose a threat to <br /> groundwater. (LUFT Manual, Leaching Potential Analyses) <br /> A Division of San Joaquin County Health Care Services <br />