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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> 9. r Donna Heran, REHS <br /> ? 600 East Main Street <br /> a: s [ <br /> �III Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 0ja <br /> Robert McClellon, REHS <br /> IiSL Jeff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> .. CP Website: www.sjgov.org/ehd <br /> Linda Turkatte, REHS <br /> 9ciF°a� Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> May 1, 2012 <br /> Ian Robb <br /> Union Oil Company <br /> 6101 Bollinger Canyon Road, Fifth Floor <br /> San Ramon, CA 94583 <br /> Subject: Former UNOCAL#6981 <br /> 4707 Pacific Avenue <br /> Stockton, CA <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed First Semi- <br /> Annual 2012 Groundwater Monitoring (Report) dated April 4, 2012, submitted on your behalf by <br /> Stantec Consulting Corporation (Stantec). Results from the Report recorded MW15 with a <br /> historical high concentration of TPH-GRO detected at 1,300 ug/L. Stantec recommends MW15 <br /> be evaluated during the second semi-annual event to determine whether the historical high <br /> detection was anomalous. Resample MW15 as soon as possible to see if TPHg persists in the <br /> previously non-detect well. Upon submission of the closure report and confirmation that MW15 <br /> is back to or near normal, groundwater monitoring may be suspended pending closure <br /> consideration. <br /> If you have any questions please contact Lisa Medina at (209) 468-3455 or by email <br /> Imedina aasicehd.com. <br /> Lisa Medina, REHS Nuel C. Henderson, Jr. PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Steve Strait, Stantec Consulting Corp., 15575 Los Gatos Blvd., Bldg C, Los Gatos CA, 95670 <br /> Ryan Zick, Target Corp., 33 South 6th Street, CC-3715, Minneapolis, MN 55440 <br /> Jim Barton, CVRWQCB, 11020 Sun Center Drive, Suite 200, Rancho Cordova, CA 95670 <br />