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5400-5606 Pacific Avenue - 3 - 23 December 2004 <br /> Stockton, San Joaquin County <br /> The Report states on page I 1 <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 /> CDCs, " <br /> Comment S) 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 of MR'--1 and AfW--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 Drzve" <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) 464-4615 for questions or additional information <br /> JAMES L BARTON, R G <br /> Engineenng Geologist <br /> Attachments <br /> cc Mr Marls 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 />