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5400-5606 Pacific Avenue• - 3 - • 23 December 2004 <br /> Stockton, San Joaquin County <br /> The Report states on page 11: <br /> `If concentrations rebound or do not continue to decrease toward remediation goals and objectives, `ENSR <br /> should consider upgrading the sparging system with ISCO to accelerate destruction and removal of the <br /> COCs;" <br /> Comment 5)For the record, ISCO is already under consideration(see Comment 3 above). <br /> The Report states on page 11: <br /> "ENSR should consider installing a catalyst or replacing the oxidizer with carbon to treat the off-gasses of the <br /> SVE system and reduce fuel costs;" <br /> Comment 6)For the record, the decision to install carbon was suggested by ENSR in a meeting with ENSR on <br /> 6 December 2004, discussed in detail in ENSR's letter of 7 December 2004, and approved by my letter of <br /> 8 December 2004. <br /> The Report states on page 11: <br /> "Evaluate the feasibility of additional AS wells in the vicinity ofMW--I and MW-3 to address the central <br /> portion of the plume not being treated by the current sparge well configuration. The evaluation should <br /> consider if there are feasible options for reaching portions of the plume under Robinhood Drive" <br /> (See enclosed Figure 3). <br /> Comment 7)By 31 January 2005,provide a detailed explanation and rationale for the proposed changes to the <br /> remediation system for the CAO NO. 5-00-707 Monitoring and Reporting Program. <br /> You may call me at(916)4644615 for questions or additional information. <br /> 'JAMES L. BARTON,R.G. <br /> Engineering Geologist <br /> Attachments <br /> cc: Mr. Mark Owens,UST Cleanup Fund, SWRCB, Sacramento <br /> Mr. Mike Infurna, San Joaquin County Environmental Health Division, Stockton <br /> Ms. Jill Tracy,Esq., UNOCAL,Brea <br /> Mr. Ben Henningburg,ENSR International, Sacramento <br /> Mr. Gary Hall, GHH Engineering,Auburn, CA <br />