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San Joaquin County <br /> DIRECTOR <br /> Donna Heran, REHS <br /> oP . . . Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> % 600 East Main Street Laurie Cotulla, REHS <br /> U): Stockton , California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> Mike Huggins, REHS, RDI <br /> C,q Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> ko'R Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464w0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> STEPHANIE FURGAL NOV 3 0 2007 <br /> CHEVRON ENVIRONMENTAL MGMT COMPANY <br /> 6001 BOLLINGER CANYON RD, RM K2240 <br /> SAN RAMON CA 94583 <br /> RE : Former Chevron #94054 Site Code : 1780 <br /> 2103 Country Club Blvd . ROM 0000635 <br /> Stockton , CA. , 95204 Global ID#: T0607700030 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the <br /> June 29, 2007 Soil Vapor Assessment Report and the August 23 , 2007 July 2007 Soil <br /> Vapor Sampling Results prepared by Arcadis BBL consulting for the above referenced <br /> site and offers the following comments . <br /> On May 16 , 2007 , soil vapor samples were collected from seven soil vapor probes/wells <br /> installed on May 2 , 2007 . The report of findings for this event was dated June 29 , 2007 <br /> and received by the EHD on July 23 2007 . Tracer gas compounds were detected in six <br /> of the seven vapor samples and your consultant recommended repeating the event. <br /> On July 12 , 2007 , another soil vapor sampling event was conducted onsite . The data <br /> for this event was included in the second report dated August 23 , 2007 that was <br /> received by the EHD on September 4 , 2007, <br /> oirvapII� s-wef eie co I d inu� nrna canisters and-E�Alvle� iod 10- lb was <br /> utilized to analyze for benzene, toluene, ethyl-benzene , and xylene (BTEX) and <br /> naphthalene . Oxygen , carbon dioxide , nitrogen , and methane were also analyzed by <br /> EPA Method D- 1946 . The analytical data was evaluated against California <br /> Environmental Protection Agency (2005) Human Exposure Based Screening Number <br /> (HEBSN) values . <br /> Contaminated underground storage tank ( UST) sites are required to analyze soil vapor <br /> samples for all constituents of concern for the site . Total petroleum hydrocarbons as <br /> gasoline (TPHg) , 1 , 24chloroethane (DCA) and methyl tert-butyl ether ( MtBE ) are <br /> constituents of concern at this site but were not analyzed for during either of the soil <br /> vapor sampling events . Soil vapor data is required for these constituents . Another <br /> sampling event is required . Please advise the EHD when you have scheduled this <br /> event. <br />