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PUBLIC HEALTH SIRVIC <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor• Stockton, CA 95202,�- <br /> 209/468-3420 <br /> STELLA RUIZ JAN 2 2 �9B <br /> 4491 W DURHAM FERRY RD <br /> TRACY CA 95376 <br /> RE: Ruiz Grocery SITE CODE: 1551 <br /> 4491 West Durham Ferry Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD) has completed review <br /> of the "Quarterly Groundwater Monitoring Report - Fourth Quarter 1997"which was dated January 5, 1998 <br /> and prepared by Clearwater Group. PHS/£HD has the following comments for your consideration and <br /> response. <br /> The quarterly report included the results of the November 14, 1997 groundwater sampling event which <br /> evidenced contamination of the on site domestic well of up to 1.2 ppb benzene. Significant groundwater <br /> contamination continues to be evidenced in the monitoring wells of up to 1,900 ppb benzene and 2,500 ppb <br /> MTBE. <br /> According to the quarterly report,a cost pre-approval request has been submitted to the Underground Storage <br /> Tank Clean-up Fund for tasks associated with installation,start-up,operation and maintenance of the <br /> remediation system. PHS/EHD approved the "Revised Remedial Action Plan"in correspondence dated January <br /> 3, 1997. In April 1997,the additional vapor extraction well was installed and by October 1997,the final <br /> design was completed and three bids obtained for submittal to the State Water Resources Control Board. <br /> While the domestic well that evidenced contamination is not currently used for drinking water,it is used to <br /> supply household water to two residences. The families that are served by the domestic well are using either <br /> bottled water or have installed a filtration purifying system for drinking water. Please proceed with efforts to <br /> obtain permission so that the neighboring domestic wells can be sampled to ensure that the wells have not <br /> been contaminated with petroleum hydrocarbons or MTBE. <br /> The detected concentrations of MTBE were confirmed by EPA Method 8260 on January 22, 1997. All the <br /> samples collected from the monitoring wells and domestic well(s) during first quarter 1998 should undergo <br /> EPA Method 8260 analysis for oxygenates,other than and including MTBE.,pursuant to the enclosed Central <br /> Valley Regional Water Quality Control Board correspondence dated August 30, 1997 and PHS/EHD <br /> correspondence dated September 25, 1997. <br /> Please provide PHS/EHD with notification once pre-approval has been obtained and installation of the <br /> remediation system has been scheduled. Also,continue to provide PHS/EHD at least two working days notice <br /> prior to any site visit,so that field inspections may be scheduled. <br /> Please feel free to contact me at (209) 468-0337. <br /> Donna Heran,REHS,Director <br /> Environmental Health Division <br /> n� r <br /> Mary Meays,Senior REHS Zrgar�egorio, RE� <br /> Site Mitigation Unit Supervisor <br /> enclosures <br /> cc: Pat Anderson,CVRWQCB (w/o enc.) cc: T. Trinh,SWRCB-Cleanup Fund (w/o enc.) <br /> cc: Brian Gwinn,Clearwater <br /> A Division of San Joaquin County Health Care Services <br />