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l <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • s' _ Robert McClellon,REHS <br /> • . Jeff Carruesco,REHS,RDI <br /> rq•• ,��P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> �r�og <br /> Phone: (209)468-3420 <br /> Fax: (209) 464-0138 <br /> May 4; 2010 r <br /> • s.s.lU <br /> Mr. Thomas Sexton Shadrall Hammer Lane L.P. <br /> Ultramar Inc. Mr. Eric Schneider <br /> 685 West Third Street c/o Auburndale Properties, Inc. <br /> Hanford, CA 93230 5670 Wilshire Blvd., Ste 1470 <br /> Los Angeles, CA 90036 <br /> Subject: Beacon #3641 1 Shadrall Property#1415 LOP Case#: 1125 <br /> 1210 E. Hammer Lane APN: 094-030-12 <br /> Stockton, CA 95210 Geotracker ID#: T0607700492 <br /> In correspondence dated February 2, 2010, the San Joaquin County Environmental Health <br /> Department (EHD) notified you that the EHD did not concur with:your technical justification for <br /> not collecting soil gas samples and that you were to proceed with the collection of soil vapor <br /> samples and conduct a vapor intrusion hazardous risk assessment. You were to inform the <br /> EHD if you wished to have the October 30, 2009 work plan (Plan) reviewed or if you had other <br /> plans to continue the required investigation. <br /> In electronic mail dated April 19, 2010, Rexford Smith of Horizon Environmental advised the <br /> EHD that he wished to utilize the Plan but requested a reduction of the five soil gas probes <br /> originally proposed to one, specifically SG-3, located on the west side o?the building, east of the <br /> underground storage tank (UST) upit. Additionally, Mr. Smith advised that the modifications <br /> requested in an electronic mail dated March 3, 2010, are withdrawn. <br /> The EHD has reviewed the Plan, the request to reduce the number of soil gas probes, and the <br /> E <br /> `request to withdraw additional modifications of the Plan, and has the following comments. <br /> The Plan was a proposal to install five soil gas .probes-to five feet below the surface (`bgs),- <br /> conduct a purge volume test, utilize a purge volume determined to provide the highest <br /> constituent concentration, conduct a leak test,. collect soil gas samples utilizing 100 milliliter <br /> sampling syringes from each probe, and analyze the samples-in an onsite mobile laboratory for <br /> total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX), methyl tert-butyl ether (MtBE), and the-leak compound by EPA Method 82606. <br /> Additionally, a 0.25-liter Summa canister duplicate sample was to be collected for testing at'an <br /> E outside lab for the same constituents utilizing EPA Method TO-15. The results will be evaluated <br /> against the San Francisco Bay: Regional Water Quality Control Board (SFBRWQCB), <br /> 'Environmental Screening Levels (ESL), residential values and a report submitted to the EHD for <br /> review. <br /> k <br />