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San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street <br /> Laurie Cotulla,REHS <br /> yIlj < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 1 LISL'1.. _ Carl Borgman,REHS <br /> Mike Huggins,REHS, RDI <br /> c P Website: wwwsjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesoo,REHS, RDI <br /> Kasey Foley,REHS <br /> July 28, 2008 <br /> Sergio Morescalchi Albert Scannavino <br /> Atlantic Richfield Company Scannavino Properties <br /> PO Box 1257 5463 Cherokee Lane <br /> San Ramon, CA 94583 Stockton, CA 95215 <br /> Subject: ARCO Station #595 Site Code: 0707 <br /> 6100 North Highway 99 <br /> Stockton, CA 95212 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Addendum to <br /> Work Plan for Well Installation (Addendum) dated July 11, 2008, submitted on your behalf by <br /> Stantec Consulting Corporation (Stantec) and has the following comments. <br /> In early 2005 the active investigation of this contaminated underground storage tank (UST) <br /> site was postponed to allow for an extensive road construction project to proceed. At that <br /> time an approved Work Plan for additional site assessment, dated May 6, 2004, had been <br /> approved for implementation by the EHD. A recent Work Plan dated May 29, 2008, <br /> submitted on your behalf by Stantec (then SECOR) did not incorporate the proposals for <br /> continued delineation of the plume made, and approved, in the May 6, 2004 Work Plan. <br /> In correspondence dated June 13, 2008 the EHD responded to the May 29, 2008 Work Plan, <br /> which proposed to reinstall previously destroyed monitoring wells, and directed submittal of a <br /> work plan addendum to include the following: <br /> 1. Replacement of groundwater monitoring well MW-1. <br /> 2. Installation of additional deep groundwater monitoring wells as proposed in the <br /> May 2004 work plan. <br /> 3. Installation of a deeper groundwater monitoring well as proposed in the May 2004 <br /> work plan. <br /> The submitted Addendum describes replacement of groundwater monitoring well MW-1 only. <br /> Stating that the approved May 6, 2004 work plan was based on data from fourth quarter <br /> 2003, and thus is five years old, Stantec has requested on your behalf delaying continuation <br /> of the investigation of the vertical extent of the contamination at this site for an additional <br /> year following replacement of the previously destroyed groundwater monitoring wells. <br /> However, between fourth quarter 2003 and first quarter 2005 when the deep groundwater <br /> monitoring wells (DMW-1 through DMW-3) were destroyed, the concentrations of methyl <br /> tertiary butyl ether (MtBE) and ethanol reported in them either remained stable (DMW-3) or <br />