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PUBLIC11EALTH SERVICES <br /> ,o �o <br /> SAN JOAQUIN COUNTY =: c <br /> ENVIRONMENTAL HEALTH DIVISION <br /> w: i< <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> REXACOI <br /> NSKI <br /> TREFINING AND MARKETING INC C <br /> 108 CUTTING BOULEVARD <br /> RICHMOND CA 94804 <br /> FEE 1 d 1995 <br /> RE: 440 W. Charter Way SITE CODE: 1055 <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> the review of the quarterly report for the third quarter 1994, dated November 21, 1994, and has the <br /> following comments for your consideration. <br /> The report submitted fails to provide current updated information on the status of the remediation <br /> system or any other activities being planned at the site. Please include in all future quarterly <br /> reports the current status of all acitivities at the site. <br /> It appears that the most recently installed monitoring wells at this site have been monitored and <br /> sampled only one time. The one round of sample results obtained from these outer lying wells is not <br /> sufficient to provide information on the extent and trends of the contaminant concentrations in the <br /> groundwater as well as any potential additional sources to this plume. Therefore, please begin <br /> monitoring and sampling these wells effective immediately. <br /> A modified sampling plan may be submitted to PHS/EHD for review and concurrence and must <br /> address the following concerns. All wells at the site must be sampled on a yearly basis. All wells on <br /> the site must be monitored on a quarterly basis for visual or olfactory evidence of contamination, for <br /> groundwater elevation and flow direction information, and to ensure that the wells remain in a usable, <br /> sealed condition. Any downgradient wells must be sampled quarterly. The wells that may be <br /> candidates for a reduced sampling frequency are those that can show long term trends with a reduced <br /> sampling frequency and for which a nearby well (or wells) can provide similar information (information <br /> that may be inferred from a nearby well). <br /> The analytical results in the quarterly report show extra samples labeled as MW#21 and MW#26. <br /> These samples, what they represent and the results were not reported in the discussion or table <br /> portions of the report. By March 3, 1995, please provide clarification on the purpose and results <br /> of these samples. <br /> The laboratory method blank samples show contamination. This is not as much a concern for this <br /> reporting quarter due to the high levels of contamination noted in the samples from the wells. <br /> However, if this is evidenced when the outer lying wells are sampled it may not provide accurate <br /> information as to the quality of the groundwater in the area of those wells. <br /> Lastly, the chain of custody is not complete. The disposition and condition of the samples is unclear <br /> from the time the samples were collected on September 22, 1994 until the date the laboratory received <br /> A 1)msion or San Joaquin County Health Care Service% <br />