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i <br /> PUBLIC 4EALTH SERVYCES <br /> SAN JOAQUIN COUNTY r X <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 FILE CO <br /> Lf FCR \ <br /> 209/468-3420 <br /> HEINZ USA OCT 19 Imo$ <br /> P O BOX 57 <br /> PITTSBURGE PA 15230-0057 <br /> RE: 757 E ELEVENTH ST SITE CODE: 1390 <br /> TRACY CA 95378-0057 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is the lead <br /> agency providing the oversight of the investigation and cleanup of releases from underground <br /> storage tanks (USTs)within San Joaquin County. PHSIEHD has a contract with the California <br /> State Water Resources Control Board to conduct a UST corrective action program. The above <br /> referenced site has been placed in the PHSIEHD Local Oversight Program (LOP). <br /> On August 29, 1997 PHSIEHD reviewed a Phase II Environmental Site Assessment Work Plan <br /> (WP) prepared by ERM and issued a permit to perform soil and groundwater sampling in the <br /> areas of two USTs previously closed in place. The soil and groundwater sample results from both <br /> UST areas evidenced gasoline contamination, that required further soil and groundwater <br /> investigation and remediation. <br /> On October 14, 1997 PHSIEHD completed and filed an Unauthorized Release f=orm for the <br /> documented soil and groundwater contamination from the two USTs. A Notice of Responsibility <br /> dated October 21, 1997 was mailed to you as notification that the site had been assigned to the <br /> PHS/EHD LOP. <br /> ERM, on behalf of Heinz, installed, developed, and sampled two on site monitoring wells; one <br /> monitoring well at each location. After reviewing the latest data submitted to PHSIEHD and <br /> discussions with the Central Valley Regional Water Quality Control Board regarding the site <br /> investigations, you are required to install additional monitoring wells at each location. The <br /> monitoring wells will be used to: confirm the groundwater gradient, document the size of the <br /> groundwater contaminant plume, and determine the contaminant concentrations within the plume. <br /> A monitoring well should be placed within 10 feet of each of the former tank locations in a down <br /> gradient direction. Another monitoring well should be placed up gradient of each of the former <br /> tank locations. The monitoring wells at each UST location should form a triangle for the purpose <br /> of gradient determination. <br /> When investigating and evaluating remedial measures for groundwater contaminated sites, you <br /> should be following the Central Valley Regional Water Quality Control Board guidelines found in <br /> the Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of <br /> Underground Tank Sites, including Appendix A and Appendix B. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at(209) 468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> cc: CVRWQCB -Mark List <br /> HEINZ <br /> I <br /> A Division of San Joaquin County Health Care Services <br />