SITE INFORMATION AND CORRESPONDENCE

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PUBLX�HEALTH sERVICES SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Karen Furst, M.D., M.I'.H., Health Officer ��iji:pgd�P 304 East Weber Avenue,Third Floor • Stockton, CA 95202 209/468-3420 JUL 0 5 2001 CRAIG OGATA 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 On July 3, 2001, a meeting was held in the office of San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD)to discuss the investigations and remedial actions at San Joaquin County owned sites that are contaminated from unauthorized releases from underground storage tanks. Lori Duncan, Dot Lofstrom, Sam Savig and I represented PHSIEHD. Kerry Wasson and Bob McMillen represented the County as the responsible party for the contaminated sites. The following is a summary of the site discussions and PHSIEHD directives for the sites. It was discussed that the Airport facility at 5000 S. Airport Way, Stockton, has not been assigned to your department for representation. PHSIEHD will direct the responsible parties for the Airport facility to submit a work plan to investigate the contamination at that site. It was discussed that a limited amount of money has been allocated by the County for the investigation and remediation of these sites. It was also discussed that the State of California has recognized that Methyl Tertiary Butyl Ether(MTBE) is a risk to the environment and that priority for further work at sites would be based on site specific risk factors. 1810 E. HAZELTON, STOCKTON Soil and groundwater contamination of MTBE as well as petroleum hydrocarbon contaminants has been confirmed at this site. Currently, this site is of highest priority. The vertical and lateral extent of the contamination in the soil and groundwater must be defined. A survey to locate all wells within 2000 radial feet of this site was conducted. The Department of Water Resources was contacted but well logs indicating the location and construction of the two wells identified were not provided. California Water Service was also contacted but information on their seven wells that were identified was not provided. There was no discussion about any commercial or industrial sites (including Diamond Walnut)that may have wells nor was their discussion about the City of Stockton wells located at 1050 Diamond. The well survey information was faxed to PHSIEHD and the map is not clear. The above information can be compiled and submitted to PHSIEHD by Facilities Management staff. A work plan to continue the site investigation has been approved by PHSIEHD. Other consultants will review the proposal and costs prior to this scope of work being performed or scheduled. 145 S. SUTTER, STOCKTON (HUMAN SERVICES) Quarterly sampling and monitoring of the groundwater at this site must continue. Analysis for oxygenates has been performed on the groundwater samples collected from the monitoring wells at this site and were not detected so this analysis can be discontinued. The vertical and lateral extent of contamination at this site has not been defined. This definition will be required later. Groundwater has risen since the initial investigation at this site was performed. The benzene identified in the vadose zone (soil above groundwater) previously is now in the saturated zone. The potential for benzene in the building air should be evaluated. This evaluation should be submitted by September 1, 2001. A Division of San Joaquin County Health Care Services