SITE INFORMATION AND CORRESPONDENCE_FILE 1

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ENVIRONMENTAL HEALTh DEPARTMENT SAN JOAQUIN COUNTY Donna K. Heran, R.E.H.S. Unit Supervisors o,reerar 304 East Weber Avenue, Third Floor Carl Borgman, R.E.H.S. 1 . r- Al Olsen, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E.H.S., RD.I. • eq : _F o,fta�P • Program Manager Telephone : (209) 468-3420 Douglas W. Wilson, R.E.H.S. Laurie A. Cotulla, R.E.H.S, Margaret Lagorio, R.E.H.S. Program Manager Fax : (209) 464-0138 Robert McClellon, R.E.H.S, Mark Barcellos, R.E.H.S. CRAIG OGATAC � 7 Z' DIRECTOR OF FACILITIES MANAGEMENT 212 N SAN JOAQUIN STREET SUITE A STOCKTON CA 95202 RE : San Joaquin County Owned Sites Contaminated from Leaking Underground Storage Tanks In July 2001 a meeting was held at the Environmental Health Department (EHD) office to discuss the status of the investigations at San Joaquin County owned contaminated underground storage tank (UST) sites. A limited amount of money has been allocated by the County for investigation of their contaminated UST sites so little progress towards closure has occurred . EHD provides the following status of each site and has scheduled a meeting at our office for November 1 , 2005, to discuss directives for the sites. 1810 E . HAZELTON , STOCKTON This is considered a high priority site. The gasoline and MTBE contamination in groundwater has not been defined . Currently, seven groundwater monitoring wells have been installed onsite. The lateral extent of the shallow groundwater contamination is basically defined , but the vertical extent has not been investigated . Remediation wells have been installed and remediation testing is to be conducted . In September 2003 there was . 5 feet of free product documented in MWA . The free product in MW1 has been removed by a passive skimmer reducing the free product to a sheen on the water. 145 S. SUTTER STREET, STOCKTON The issue of the rising groundwater elevation , potentially releasing vadose zone benzene contamination to the groundwater, and the potential for the benzene to migrate into the building air was addressed by a risk assessment that was submitted to EHD in December 2001 . The finding was that the risk level for people inside the Human Services Agency building from migrating benzene vapors was acceptable. Groundwater monitoring and sampling is ongoing ; the vertical extent of the groundwater contamination in the source area has not been defined . The Corrective Action Plan submitted in January 1998 recommended Intrinsic Remediation with Monitoring as the appropriate corrective action for this site. Reviews of the plan were to be conducted at five year . intervals . 503 E. TENTH STREET, TRACY The contamination at this site appears to be defined . A feasibility study has not been performed . Monitoring and sampling of the groundwater has not been conducted since February 1999 .