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Thrifty Oil #171 page 2 <br /> 1250 N. Wilson Way, Stockton. <br /> All quarterly monitoring reports are to contain a "recommendation and conclusion" <br /> section that clearly describes the site status now and plans for the immediate future. Sites <br /> that do not have the full lateral and vertical soil and groundwater plumes clearly defined <br /> shall take steps to propose further work to gather the data needed to completely assess <br /> the site. <br /> In previous phone conversations, PHS-EHD understood that both this site and TOC Station #172 <br /> would be going into the remediation phase soon. In order to avoid any misunderstandings in the <br /> future, PHS-EHD will require a complete schedule for these two sites that clearly shows dates <br /> TOC will submit the required cost-effective remediation studies or the dates these accepted <br /> methods will be implemented. The schedules for each site or the cost-effective study shail <br /> be submitted to PHS-EHD by March 30, 1998. <br /> High levels of petroleum hydrocarbons were detected in monitoring well "TB-1"on November 13, <br /> 1997. The groundwater gradient in this well's area was southwesterly (away)from this well <br /> towards the center of the site. Either the groundwater gradient direction at this site is represented <br /> incorrectly or there may be another source of petroleum contamination in this area. Please verify <br /> that the depth to water measurements are valid and are taken from a consistent point on each <br /> casing. PHS-EHD recommends a new survey be conducted to ensure that the top of casing <br /> elevations are true and clearly marked with the measuring point. The results of the survey should <br /> be included in the next quarterly report. <br /> Recently this site has received a"Letter of Claim Acceptance"from the State Water Resources <br /> Control Board (SWRCB), Clean Up Fund (CUF). In order to become eligible or remain eligible to <br /> receive reimbursement from the CUF, sites must be in compliance with directives issued by PHS- <br /> EHD. Please take this time to evaluate your position on this site. PHS-EHD highly recommends <br /> you take immediate steps to bring this site into compliance and complete all of the required <br /> investigative steps so the site may be evaluated for the most cost-effective method of <br /> remediation. <br /> Please direct you correspondence to our new address noted on this letterhead and you may <br /> contact Michaei Infurna at (209) 488-3454 if you have any questions. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> j� G <br /> Michael J. Infurna Jr., Senior REHS Margare agorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> MI/ <br /> c: CVRWQCB - Pat Anderson <br />