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ENVIROT'4TUENTAL HEALTH`'DEPARTMENT <br /> oPa"°" SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director <br /> AI Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> --- Douglas W.Wilson,R.E.H.S. <br /> • FpR • Program Manager Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Corona,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> CRAIG OGATA OCT U 7 <br /> DIRECTOR OF FACILITIES MANAGEMENT <br /> 212 N SAN JOAQUIN STREET SUITE A <br /> STOCKTON CA 95202 <br /> RE: San Joaquin County Owned Sites Contaminated from Leaking <br /> Underground Storage Tanks <br /> In July 2001 a meeting was held at the Environmental Health Department (EHD) office to <br /> discuss the status of the investigations at San Joaquin County owned contaminated <br /> underground storage tank (UST) sites. A limited amount of money has been allocated <br /> by the County for investigation of their contaminated UST sites so little progress towards <br /> closure has occurred. EHD provides the following status of each site and has scheduled <br /> a meeting at our office for November 1, 2005, to discuss directives for the sites. <br /> 1810 E. HAZELTON, STOCKTON <br /> This is considered a high priority site. The gasoline and MTBE contamination in <br /> groundwater has not been defined. Currently, seven groundwater monitoring wells have <br /> been installed onsite. The lateral extent of the shallow groundwater contamination is <br /> basically defined, but the vertical extent has not been investigated. Remediation wells <br /> have been installed and remediation testing is to be conducted. In September 2003 <br /> there was .5 feet of free product documented in MW-1. The free product in MW 1 has <br /> been removed by a passive skimmer reducing the free product to a sheen on the water. <br /> 145 S. SUTTER STREET, STOCKTON <br /> The issue of the rising groundwater elevation, potentially releasing vadose zone <br /> benzene contamination to the groundwater, and the potential for the benzene to migrate <br /> into the building air was addressed by a risk assessment that was submitted to EHD in <br /> December 2001. The finding was that the risk level for people inside the Human <br /> Services Agency building from migrating benzene vapors was acceptable. Groundwater <br /> monitoring and sampling is ongoing; the vertical extent of the groundwater contamination <br /> in the source area has not been defined. The Corrective Action Plan submitted in <br /> January 1998 recommended Intrinsic Remediation with Monitoring as the appropriate <br /> corrective action for this site. Reviews of the plan were to be conducted at five year <br /> intervals. <br /> 503 E. TENTH STREET, TRACY <br /> The contamination at this site appears to be defined. A feasibility study has not been <br /> performed. Monitoring and sampling of the groundwater has not been conducted since <br /> February 1999. <br />