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�pUJN <br /> PUBLIC HEALTH SERVICiS o.._. ..� <br /> } SAN JOAQUIN COUNTY a•;; ;; <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer `P.. <br /> 304 East Weber Avenue, Third Floor - Stockton, CA 9520 r .o,R�; <br /> LE. H <br /> 2091468-3424 <br /> STELLA Rutz SEP 2 01999 <br /> 4491 DURHAM FERRY ROAD <br /> 4 3 <br /> TRACY CA 95376 <br /> h RE. Ruiz Grocery SITE CODE: 1551 <br /> 4491 W. Durham Ferry Road <br /> r <br /> Tracy, CA 95376 <br /> San Joaquin County Pubiic Health Services, Environmental Health Division (PHSIEHD) <br /> has reviewed the most recent data from the catalytic oxidizer soil vapor extraction (SVE) <br /> system currently operating at the above referenced site, and the most recent <br /> groundwater analytical results from the site, and has the following comments. <br /> The SVE system has been in operation at this site.for approximately one year. Monthly <br /> air sample analysis has shown a marked decrease in the influent contaminant <br /> concentration for the past four months, from over, <br /> t3000 parts per million (ppm) total <br /> petroleum hydrocarbons as gas (TPHg) to 28 ppm TPHg. Quarterly groundwater <br /> sample analysis has also shown a significant decrease in the levels of contaminant <br /> concentrations detected in both MW-1 and MW-2. <br />' It is the recommendation of Clearwater Group, Inc. (CCI), the consultants for this site, <br /> that the SVE system has reached a plateau in its.ability to recover contamination and <br /> should be removed. PHSIEHD concurs with this recommendation. <br /> In conversation with CCI it was discussed that following the removal of the SVE system, <br /> the site will be allowed to equilibrate for a period of,-2-3 quarters of continued <br /> groundwater monitoring and sampling. After that time the available data will be reviewed <br /> and a decision will be made as to the need for further remediation at this site. All wells, <br /> ` piping and manifolds will remain on site. Confirmation soil borings will be required <br /> following the completion of all remediation and prior to review of the site for closure: <br /> If you have any questions please call Lori Duncan'at (209) 468-0337. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Lori Duncan, REHS Margaret�Lagorio, RENS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Maroc List, CVRWQCB <br /> Brian Gwinn, CCI <br /> f <br />{'. A Division of San Joaquin County Health Care Services <br /> } <br />