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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY =. <br /> N; X <br /> JOGI KHANNA M.D„M.P.H :. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> r <br /> JONATHAN MARLO WE <br /> MARLOWE PROPERTIES <br /> P O BOX 150-211 <br /> SAN RAFAEL CA 95915 F­ 0 E 1993 <br /> RE: Marlowe Property SITE CODE: 1828 <br /> 4648 Waterloo Road <br /> Stockton CA 95215 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD) has <br /> completed review of the "Quarterly Report"dated October 1993 and prepared by Geological <br /> Audit Services. PHS/EHD has prepared the following comments for your consideration. <br /> The report included the results of the recent investigation during which two additional <br /> monitoring wells were installed and all on-site wells sampled. Soil samples were collected <br /> at 30', 45' and 85' during installation of MW3 and MW4. Soil contamination was detected <br /> only in the sample collected at 45' during the installation of MW4 and consisted of 0.43 ppm <br /> bromomethane. <br /> Groundwater contamination was detected in all on-site wells containing sufficient water to <br /> sample, MW2, MW3, MW4 and the domestic well. The monitoring wells were sampled on <br /> October 4, 1993 under PHS/EHD inspection; however, the domestic well was sampled on <br /> October 12, 1993 without PHS/EHD inspection. The groundwater samples from the <br /> monitoring wells were analyzed utilizing EPA Method 602 and indicated that the wells were <br /> impacted by petroleum hydrocarbon contamination. The groundwater sample from the <br /> domestic well was not analyzed utilizing EPA Method 602 therefore, petroleum hydrocarbon <br /> contamination was not evidenced. The results of analysis utilizing EPA Method 601 <br /> evidenced halogenated volatile organic contamination which is likely not associated with the <br /> former leaking underground storage tanks. <br /> The report included conclusions and recommendations which indicated that the extent of soil <br /> contamination had been defined and that one vadose-zone well would be sufficient to <br /> remediate the documented soil contamination by utilizing either vapor extraction or in-situ <br /> bioremediation. Please submit by February 15, 1994, a work plan to install the proposed <br /> vadose-zone well and a description of a minimum of three possible soil remediation methods <br /> and the preferred alternative. <br /> A Division of San Joaquin Counry Health Care Services �� <br />