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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> Environmental Health Denartment <br /> M ASSISTANT DIRECTOR <br /> Za 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> �;•. p Mike Huggins, REHS, RDI <br /> Website: www.sjgov.org/ehd 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 /> 15 February 2008 <br /> Carl Navarra <br /> 475 Blewett Road <br /> Tracy CA 95376 <br /> SUBJECT: Navarra Property <br /> 7500 W. Eleventh Street <br /> Tracy CA 95376 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Corrective Action Plan (Addendum) for Former Fueling Station, 7500 West Eleventh Street, <br /> Tracy, California (CAP Addendum), dated October 2007, prepared by The San Joaquin <br /> Company, Inc. (TSJCI). The CAP Addendum was prepared in response to the EHD comment <br /> letter dated 02 August 2007 regarding Corrective Action Plan for Former Fueling Station, 7500 <br /> West Eleventh Street, Tracy, California (CAP), dated 25 July 2007, also prepared by TSJCI. <br /> In the CAP, TSJCI presented the current hydrogeological model and characterization for the site <br /> and compared three remedial alternatives for addressing impacted groundwater and soil on the <br /> site north of Eleventh Street (7501 W. Eleventh Street), where the highest contaminant <br /> concentrations and light, non-aqueous phase liquid (LNAPL) hydrocarbons have been <br /> encountered. Comparing the potential technical effectiveness and relative costs for skimming <br /> LNAPL from three extraction wells, pumping LNAPL from three extraction wells into a vacuum <br /> truck; and utilizing an extraction trench with high-volume pumping of LNAPL into a vacuum <br /> truck, TSJCI recommended use of the extraction trench. <br /> The EHD requested more information to assist the EHD's evaluation of the proposed use of the <br /> extraction trench; the information specifically requested was: <br /> • An updated LNAPL volume or mass estimate and the estimated portion that will be <br /> addressed by the proposed extraction trench; <br /> • The mass of dissolved and sorbed contaminants and the portion that will be addressed <br /> by the extraction trench; <br /> • The optimal contaminant mass to be removed to enable natural attenuation to complete <br /> the remedial action in an acceptable time period. <br /> In the CAP Addendum, TSJCI utilized more recently obtain data and revised the originally <br /> estimated 1,000 to 8,000 gallons of LNAPL downward to 1,050 gallons of fuel hydrocarbons. Of <br /> the 1,050 gallons of fuel hydrocarbons, TSJCI estimated that between 525 and 1,050 gallons <br /> are recoverable. <br /> WP Comment Letter 0208 <br />