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San Joaquin:County: . DIRECTOR <br /> Q N Donna Heran,REHS <br /> oP N Environmental .Health Department <br /> ASSISTANT DIRECTOR <br /> s z 600.East MainStreet, Laurie cotulla,REHS <br /> ,_< Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • a Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> Webs%fe: www.Sfgo, orglehd Margaret Lagorio, REHS <br /> Phone: (209)468-3420. Robert McClellon,REHS <br /> Fax`. (209)464-0138 .Jeff Carruesco,REHS, RDI <br /> Kasey Foley, REHS <br /> FEB 0 5 .2008 <br /> Paul Verma - Rosaia, D & NC Trust, etal <br /> City of Tracy PO Box 274 <br /> 520 Tracy Boulevard Tracy CA 95378 <br /> Tracy_ CA 95376 <br /> Subject: Delta Disposal Site Code: 2183 <br /> 99 West Sixth Street <br /> Tracy CA 95376` <br /> The San Joaquin County Environmental Health. Department (EHD) has 'reviewed Limited <br /> Phase /I Site Investigation (Work Plan)`dated December 10, 2007 that was submitted on your <br /> behalf by Wright Environmental. Services (Wright) and has the following comments. <br /> In 1985 two underground storage tanks (UST) were removed from the subject site. In May <br /> 1990 the former UST area.was•re-excavated and soil samples for analysis were collected. <br /> Analytical results reported petroleum hydrocarbon impact to the soil samples. Since that <br /> time, the former UST area was incorporated into part of Sixth Street. In February 2003, three <br /> -direct push soil borings were advanced in and near the. former UST area. Soil and grab <br /> groundwater samples for laboratory analyses were-collected: Laboratory analytical results <br /> confirmed petroleum hydrocarbon contaminant impact to both soiland groundwater. <br /> Wright proposes to conduct' a sensitive receptor survey to identify all wells and potential <br /> receptors located within a 2000-foot radius of the`former,UST.area: Wright further proposes <br /> the installation of three groundwater monitoring wells. To avoid having monitoring wells in <br /> the street,one well will be located upgradient to the former UST area, and two wells will be <br /> located downgradient from the former UST area.. <br /> The EHD. approves the proposed scope of work with the condition that analysis for ethylene <br /> dibromide is added to,the analytical suite: If you"have any questions please call Lori Duncan <br /> at (209) 468-03.37. <br /> Sincerely, <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., PG <br /> Registered Environmental Health Specialist Engineering Geologist <br /> cc: James Barton, CVRWQCB, 11020 Sun,Center Drive, #200,'Rancho Cordova CA 95670 <br /> John Lynch, Wright Environmental, 2395 East Pescadero Avenue, Tracy CA.95304 <br />