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PUBLIC ITEALTH SERVICES X. .co SAN JOAQUIN COUNTY ' z� ENVIRONMENTAL HEALTH DIVISION w. ` s: a Karen Furst, M.D., M.P.H., Health Officer , �P 304 East Weber Avenue, Third Floor • Stockton, CA 95202 %;;0 209/468-3420 FRANK GUINTA JAMES RAMSEY 2072 W YOSEMITE AVE 840 LA CONTENTA DRIVE MANTECA CA 95336 VALLEY SPRINGS CA 95252 RE: FRANKS EXXON SITE CODE: 1426 2072 W YOSEMITE AVE 'AUG 2 0 10 MANTECA CA San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has received and reviewed the July 10, 1998 Remedy Expert Environmental (REE) Tank Removal Report for Frank's One Stop and provides the following comments and directives. The REE report fails to provide analytical data for all water samples collected from the tank pit, dispenser and piping area. PHS/EHD now directs you as responsible party to submit all analytical data from the tank removal to this office and report the findings no later than 5:00pm,September 1, 1998. The presence of 1,2-Dichloropropane in drinking water and other contaminants at the above referenced site are of concern to this agency. As responsible party for this site, you have failed to voluntarily sample, analyze, and report water quality for the on-site Public Water System Wellhead(#WA460903)on a routine basis with documented knowledge of potentially significant health risks to consumers. PHS/EHD recommended prior to the second sampling event that"the responsible party continue to monitor and report water quality findings on a routine basis at this wellhead in order to protect consumers." It is important to recognize that significant dilution from pumping influences is likely at this wellhead. This observation suggests that a notable mass/source of 1,2-Dichloropropane exists within the capture zone of this wellhead and that dilution effect is unpredictable. In addition, PHS/EHD has confirmed the presence of MTBE in groundwater at 75 feet below grade, less than 50 feet laterally from the intake screens of this well. PHS/EHD considers these conditions to pose a significant health risk to consumers of water from this and other wells in the area. PHS/EHD now directs the responsible party to sample and analyze water(full scan EPA Method 524.2) from this well,and report the findings no later than 5:00pm,September 15, 1998. The responsible party shall continue to routinely sample, analyze, and report water quality findings on a quarterly basis or more frequently if necessary to adequately protect consumers. We request that all required work be performed in a prompt and timely manner under the direct supervision (witnessed) of PHS/EHD staff. Contact site mitigation staff to schedule inspections at least 48 hours in advance of the sampling date. Consistent with previous correspondence from this agency, you have failed to properly characterize the hydrogeology,groundwater flow conditions, and contaminant distribution at the above referenced site in a timely manner as directed.No formal report of findings from the May 1998 cone penetration tests (CPT) have been submitted to this agency for the above referenced site as required in previous PHS/EHD correspondence (no cross sections, no descriptions of site specific/regional hydrogeology, no tabulated analytical data, no recommendations, no conclusions or certification signatures by qualified professionals have been submitted to PHS/EHD). PHS/EHD now directs you as responsible party to submit a complete report of findings from the CPT work to this agency no later than 5:00pm, September 15, 1998. 1 A Division of San Joaquin County Health Care Services