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Mr. Thomas Black Page 4 of 4 <br /> Tracy Office Plaza March 15, 2016 <br /> 324 E. Eleventh St., Tracy CA <br /> TPHg, BTEX and naphthalene by EPA method 8260B and for total petroleum hydrocarbons <br /> quantified as diesel (TPHd) by EPA method 8015M. <br /> Also collect a soil sample from native soil approximately 5 feet bsg from the boring on the east <br /> property margin to hold for analysis if elevated concentrations of any Title 22 metals are <br /> detected in the sample from the B-1 area; however, if any soil samples from the eastern boring <br /> yields field indications of being impacted by contaminants, collect a sample from a contingency <br /> boring in the B-2 or B-3 area. The hold sample should be analyzed only for the metals that <br /> appear to have elevated concentrations; consult with the EHD prior to analyzing the sample. <br /> To address Pangea's recommendation for a sensitive receptor survey, the EHD recommends <br /> review of the THS site records and check for a sensitive receptor survey conducted for that site; <br /> if one has already been conducted, much of the information should be applicable to the subject <br /> site; otherwise, conduct the survey as recommended. <br /> Questions and comments can be addressed to Nuel Henderson, PG, at (209) 468-3436 or at <br /> nhenderson(aD_sicehd.com. <br /> Sincerely, <br /> Nuel Henderson, PG <br /> Engineering Geologist <br /> C Robert Clark-Riddell, Pangea, 1710 Franklin St., Ste 200, Oakland, CA 94612 <br /> Nathan Casebeer, CVRWQCB, 11020 Sun Center Dr., Ste 200, Rancho Cordova, CA <br /> 95670 <br /> Leona Winner, DTSC, 8800 Cal Center Dr., Sacramento, CA 95826 <br />