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i <br /> San Joaquin.County DIRECTOR <br /> PQM u Donna Heran,REHS <br /> �0 ` 00 Environmental .Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla REHS <br /> p: Stockton California 95202-3029 PROGRAM COORDINATORS <br /> •.•. tis.. <br /> Carl Borgman,REHS <br /> ° �P Website: wwi%l.sjgov.org%hd Mike Huggins,REHS, RDI <br /> q��F o R Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,RENS <br /> Fax: (209)464-0138 Jeff Carruesco,RENS,RDI <br /> Kase Fol HS <br /> KE <br /> 0 �0 <br /> LLY ESTERS OCA � <br /> CHEVRON TEXACO ENVIRONMENTAL MANAGEMENT COMPANY <br /> P O BOX 6012, ROOM K2236 <br /> SAN RAMON CA ' 94583-0804 <br /> RE: Chevron Service Station 9-1452 <br /> 334 East Main Street <br /> Ripon,California <br /> i <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed Soil <br /> Vapor Sampling Work Plan dated October 1, 2007, prepared by Conestoga-Rovers & Associates <br /> (CRA) on your behalf for the above-referenced site. In the work plan CRA proposes the <br /> advancement of three soil vapor borings to approximately six feet below surface grade (bsg) using <br /> direct push technology to collect soil vapor samples at-locations indicated in Figure 2. <br /> EHD approves the advancement of the three soil probe borings for collection of soil gas samples in <br /> SUMMATM canisters. However, EHD believes either one additional-soil vapor boring is needed, or <br /> the soil boring nearest.the station building needs to be.moved to the southeast approximately fifteen <br /> feet. This new location is closer to where total,petroleum hydrocarbons as gasoline (TPHg) was <br /> detected at 260 milligrams per kilogram (mg/kg) in dispenser over-excavation .sample DX-E-7.0 <br /> during the underground storage tank removal in September 1995. Soil gas samples will be <br /> analyzed for TPHg by Environmental Protection Agency (EPA) method TO-3; volatile organic <br /> compounds (VOCs) and isobutane:-by EPA method TO-15; and oxygen (02) and carbon dioxide <br /> (CO2)by method ASTM 1946. <br /> Please respond to the EHD recommendation for either an additional soil vapor boring or relocation <br /> of the proposed soil boring,located at the northern-most position in -Figure 2 by November 26, <br /> 2007. Should you have any questions or concerns regarding this letter, please contact Vicki <br /> McCartney at(209)468-9852,or by email at vmccartney@sjcehd.com: <br /> Donna Heran,REHS, Director <br /> Environmental Health Department <br /> i <br /> Victoria L.McCartney, Senior REHS Nuel C. Henderson,Jr.,PG <br /> Unit IV-Site Mitigation Engineering.Geologist <br /> Unit IV-Site Mitigation <br /> c: Michael D. Miller,PG-CRA <br /> James L.L. Barton, PG-CVRWQCB <br /> i <br />