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w <br /> San Joaquin County DIRECTOR <br /> Q u i N Donna Heran,REHS <br /> oP Environmental Health Department M ASSISTANT DIRECTOR <br /> 2 „ 2 600 East Main Street Laurie Cotulla,REHS <br /> y { Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Mike Huggins,REHS, RDI <br /> �! Margaret Lagorio,REHS <br /> s Website: www. ov.or e <br /> 4�/FORS �g / hd g Robert McClellon,REHS <br /> Phone: (209) 468-3420 Jeff Carruesco, REHS,RDI <br /> Fax: (209)464-0138 Kasey Foley,REHS <br /> March 31, 2009 <br /> Mr. Nathan Crum <br /> -09 <br /> Woolsey Oil Inc <br /> 166 Frank West Circle <br /> Stockton CA 95206 <br /> Subject Woolsey Oil Cardlock ROM 0640 <br /> 1501 W. Charter Way CUF#: 014328 <br /> Stockton, CA 95206 APN: 16337016 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan for Soil Vapor <br /> Investigation and Vapor Intrusion Risk Evaluation (Plan) dated February 11, 2009, submitted by Ground <br /> Zero Analysis Inc. for the above subject site. The Plan was submitted to evaluate potential vapor intrusion <br /> hazards to workers in nearby buildings resulting from residual petroleum contamination proposed to be <br /> left in place as this underground storage tank (UST)site prepares for a"no further action" determination. <br /> The Plan proposes installing five shallow soil probes to five feet below grade between the former UST <br /> location and the building to the north. Soil gas samples will be collected from each probe and will be <br /> analyzed onsite utilizing a Transglobal Environmental Geochemistry mobile laboratory for total petroleum <br /> hydrocarbons quantified as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX), <br /> gasoline oxygenates and additives including ethylene dibromide (EDB) and 1,2-dichloroethane (DCA) by <br /> GC/MS (EPA Method 8260). <br /> Total petroleum hydrocarbons quantified as diesel (TPHd) are a significant constituent of concern at this <br /> site. Historically, soil samples have contained TPHd concentrations as high as 5,200 milligrams per <br /> Kilogram (mg/Kg) in sample 62-11; 4,000 mg/Kg in sample T3E-14'; and 1,800 mg/Kg in sample D2-3'. <br /> Ground water samples from monitoring well MW-3 have had as much as 2,000 micrograms per Liter <br /> (pg/L)TPHd. The Plan did not include sampling and analysis for TPHd; the EHD requires that that testing <br /> be conducted to provide for a complete evaluation. Please include EPA Method TO-17 and the proper <br /> sampling containers for the soil gas samples collected. This method will provide a scan for most of the <br /> TPHd components. <br /> After the soil gas sampling has been completed, the boreholes/push-points are to have all the introduced <br /> materials removed (except for the sacrificial point) and the borehole is to be backfilled with neat cement. <br /> The top finish may match the existing surface material. <br /> With the above noted conditions, the Plan is adequate and approved. [H&SC 25296.10(c)(3)]. Please <br /> submit a Well Permit Application Form and $404 fee by April 10, 2009. Thank you for your patience and <br /> cooperation during this review process. If you have any questions, please contact Michael Infurna at <br /> (209)468-3454. <br /> Michael J. furna Jr., RE Nuel C. Henderson Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James L. Barton—CVRWQCB, Rancho Cordova, CA <br /> Mr. Mark Owens - SWRCB-CUF, PO Box 944212, Sacramento, CA 94244-2120 <br /> Mr. Eric Price- Ground Zero Analysis, 1714 Main St., Escalon, 95320 <br /> Mr. Richard McPherson, 1459 N. Garnica Dr., Stockton, 95215 <br /> Ms. Karen Collin - Environmental Closures, 7574 Shoreline Dr. Stockton 95219 <br />