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C A M B R I A DDDD <br /> MAY 0 5 2003 May 2, 2003 <br /> ENVIRONMENT HEALTH <br /> Mr. Jeffrey Wong PERMIT/SERVICES <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 <br /> Re: Response Letter <br /> Former Shell Service Station/Econo Gas <br /> 880 Victor Road <br /> Lodi,California <br /> © SAP Code <br /> Incident No.. 9899 98995526 <br /> SJCEHD Site Code 1746 <br /> Dear Mr. Wong: <br /> Cambria Environmental Technology, Inc. (Cambria) prepared this letter on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) to respond to the San Joaquin County <br /> Environmental Health Department (SJCEHD) correspondence dated March 21, 2003 regarding <br /> the subject site. <br /> Interim Remediation, <br /> SJCEHD stated in their March 21, 2003 letter that "...the aquifer test has demonstrated the <br /> cfj'ecrtvW6ss of groundwater extraction for dissolved MTBE [methyl tertiary butyl etherl <br /> removal, but the proposed one-week per-quarter groundwater extraction schedule is insufficient <br /> as interim remediation." Based on this, SJCEHD has requested a work plan addendum to <br /> implement continuous groundwater extraction. <br /> As discussed in Cambria's December 13, 2002 Aquifer Pump Test Report, Cambria estimated the <br /> hydraulic conductivityaquifer tube0 122 rs'/day based on the recovery data from the <br /> step discharge test and 0.0944 meters/day based on the recovery data from the constant rate test. <br /> The hydraulic conductivities yielded from the recovery data analysis are within the range of silt <br /> Oakland, CA and fine sand (Todd, 1980) which correlates well with the soil types logged for this well (sand <br /> San Ramon, CA and silty sand). The transmissivity was estimated to be 0.435 metersZ/day based on the recovery <br /> Sonoma, CA <br /> data from the step discharge test, and 0.337 metersZ/day based on the recovery data from the <br /> Cambria constant rate test. The estimated transmissivities correlate to a low rate of groundwater <br /> Environmental movement through the aquifer's thickness. Under such hydrogeologic conditions, hydraulic <br /> Technology,Inc. <br /> control through continuous groundwater extraction would at a minimum require several more <br /> 270 Perkins Street <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />