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I <br /> San Joaquin County <br /> Environmental Health 'Department DIRECTOR <br /> 'cQG Donna Heran, REHS <br /> 600 East Main Street <br /> PROGRAM COORDINATORS, <br /> StocktonCalifornia 95202-3029 P <br /> Robert McClellon,REHS <br /> • .i Jeff Carruesco,REHS, RDI <br /> Kasey <br /> c P Website: www.sjgov.org/ehd Linda Foley, RENS <br /> Linda Turkatte,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> February 28, 2012 <br /> Mr. John Skance <br /> P.O. Box 1257 <br /> San Ramon, CA 94583 <br /> Subject: 76 (Former BP) Service Station No. 11192 <br /> - 1403 West Country Club Blvd., Stockton, CA <br /> - Recommendation by ATC <br /> The Environmental Health Department (EHD) has received an email from your consultant <br /> recommending that the ozone sparge system be shut down indefinitely. ATC indicates that the <br /> sparge points, installed in the shallowest water bearing zone (A-zone), no longer address <br /> significant concentrations of dissolved-phase petroleum hydrocarbons. This request was made <br /> by ATC in the quarterly Status Summary Report— Fourth Quarter 2019. <br /> In addition, ATC reported that the ozone conveyance tubing has deteriorated and that ozone <br /> was leaking from the injection wells. Therefore, ATC shut down the ozone sparge system and is <br /> currently inquiring if the ozone sparge system can remain off-line indefinitely, or if the EHD will <br /> require repairs to the system. <br /> The EHD concurs with the shut-down of the ozone sparge system and does not consider it <br /> necessary to repair the system unless rebound testing demonstrates the need for additional <br /> ozone injection. The ground water monitoring events scheduled for the first and third quarters of <br /> 2012 will probably provide adequate data to evaluate potential rebound effects. Meanwhile, you <br /> are directed to complete the lateral assessment of the TBA-impacted C-zone groundwater by <br /> advancing CPT-6. The proposed new location in Figure 2 of Site Assessment and Human <br /> Health Risk Assessment Report and Site Conceptual Model Update is approved. If the <br /> groundwater monitoring results and the CPT-6 data are favorable, it may be appropriate to <br /> consider the.site for closure. <br /> R ards, <br /> Lisa edina Nuel C. Henderson Jr., PG <br /> SeniorRegisters ,Environmental Health Specialist Engineering Geologist <br /> c: James L. Barton —CVRWQCB <br />