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Former Chevron Service Station 9-0557 Page 2 <br /> 139 South Center Street September 17, 2010 <br /> Stockton, California <br /> total xylenes (BTEX); total petroleum hydrocarbons (TPH) as gasoline (TPH-g), TPH <br /> as diesel (TPH-d), TPH as motor oil (TPH-mo), methyl tertiary-butyl ether (MTBE), <br /> ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), di-isopropyl ether <br /> (DIPE), and tertiary butyl alcohol (TBA). <br /> The EHD approves the advancement of four CPT borings at the locations proposed by HFA; <br /> however, the EHD believes the proposed grab groundwater samples should be collected at <br /> the water table and at depths identified as potentially course-grained zones on the CPT logs <br /> instead of at set thirty-foot intervals beginning at the water table. Furthermore, the EHD <br /> recommends that the grab groundwater sample be collected from discreet boreholes <br /> advanced adjacent to the four proposed CPT soil borings to diminish the potential for cross <br /> contamination between permeable subsurface soil units. The EHD also recommends that soil <br /> samples be collected at ten-foot intervals to total depth of approximately 140 feet bsg in at <br /> least one proposed soil borehole (preferably down-gradient of the former USTs). The EHD <br /> believes the depths for the remaining three proposed soil borings should be based on field <br /> findings from the initial soil boring advanced to approximately 140 feet bsg. <br /> Please submit a boring permit application for each parcel, a copy of the access agreement <br /> and encroachment permit issued by the City of Stockton, and permit/inspection fees of $488 <br /> per parcel to the EHD and complete the fieldwork by 19 November 2010. If you have any <br /> questions or concerns regarding this letter, please contact Vicki McCartney at (209) 468-9852, <br /> or by email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Elias W. Scott, Holguin, Fahan &Associates, Inc., 5627 Stoneridge Drive, Suite 320, <br /> Pleasanton, California 94588 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br /> Ms. Ava Langston-Kenney, Program Manager, City of Stockton, Revitalization <br /> Department Redevelopment Division, Real Property Section, 425 North EI Dorado <br /> Street, Third Floor, Stockton, California, 95202-1997 <br /> Greyhound Bus Lines, Post Office Box 660362, Dallas, Texas 75266-0362 <br />