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ENVIRONMENTAL HEALTH DEPARTMENT <br /> n SAN JOAQUIN COUNTY <br /> ti Donna K Heran,RE H S VartSupermars <br /> Derecror304 East Weber Avenue, Third Floor Carl Qorgman,R E 1-1 <br /> s <br /> ` x Al Olsen,R E H S Stockton, California 95202-2708 Mike Huggins,R E H 5,R D I <br /> Program blarrager Telephone 209 c}(g_ Dauglns W Wilson, R L H S <br /> Laurie A Cotulls,R E H 5 { 420 Margaret Lagorio,R E I I S <br /> Program Manager Fax (209) 464.0138 Robert McCiellon.R E H S <br /> Mark Harccllos,R E H S <br /> MAY 0 3 2005 <br /> KEN HILLIARD KENDALL YOUNG <br /> 7-ELEVEN INC YLY LLC <br /> PO BOX 711 720 YORK STREET <br /> DALLAS TX 75221-0711 SAN FRANCISCO CA 94110 <br /> RE- 7-Eleven Store #32262 SITE CODE 1505 <br /> 2360 Grant Lme Road <br /> Tracy CA 95376 <br /> San Joaquin County, Environmental Health Department(SJCIEHD) has reviewed "Work <br /> Plan forAddilronal Site Assessment and lntenm Remediallon Addendum"(Addendum) <br /> dated March 31, 2005 prepared on your behalf by Secor International Incorporated <br /> (SECOR) and has the following comments <br /> In correspondence dated February 14, 2005, SJC/EHD requested submittal of the <br /> following <br /> 1 A work plan to continue the Investigation of the vertical and lateral extent of the <br /> documented groundwater contamination at your site <br /> 2 A work plan addendum to conduct an extended groundwater extraction lest <br /> SJCIEHD recommended that the test be designed to demonstrate and <br /> compensate for the earth tidal effects SECOR reported as being a factor in the <br /> previously conducted 24-hour extraction test <br /> 3 A copy of the chromatogram from the analysis of the groundwater sample <br /> collected at 60 feet below surface grade (bsg) in CPT-1, along with an explanation <br /> as to why SECOR considered pipe dope to be the source of the contamination <br /> detected in this sample. <br /> 4 Further explanation and justification of the test method used for the oxygen <br /> infusion test conducted on June 21, 2004, SJCIEHD recommended the test be <br /> conducted as originally proposed and approved <br /> SECOR declined to submit a work plan to continue investigation of the vertical and lateral <br /> extent of the site contamination, stating that the low concentrations of methyl tertiary butyl <br /> ether(MtBE) reported In groundwater samples from the Valero branded station located <br /> down the street from the subject site define the western limits of the 7-Eleven plume, and <br /> that MtBE concentrations onsite and offsite are declining However, verification to <br /> SJCIEHD has not been made that 7-Eleven has taken possession or the Valero <br /> monitoring well that SECOR claims defines one margin of your plume, nor have they <br /> included data from this well In the quarterly reports The groundwater monitoring event <br /> that SECOR references in the Addendum as demonstrating a decline in the MtBE <br /> concentrations in both on and offsite monitoring wells had not been reported to SJCIEHD <br />