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(,,,) O <br /> Messrs Trommer and Larson April 29 2009 <br /> i March 201Pae2of30 Draft Five-Year Review Recommendation 9 <br /> Various Sites <br /> it <br /> 248 E. Park Street, Stockton, CA, Claim Number 1695: You concurred with the EHD <br /> directive to conduct dual phase extraction (DPE) pilot test; a work plan for such is due <br /> June 7,2010 <br /> 517 E. Fremont Street, Stockton, CA, Claim Number 14349 You concurred with the <br /> EHD directive to submit a-work plan to conduct a soil vapor extraction (SVE) pilot test: <br /> The results from a recent DPE pilot test were interpreted to show DPE would not be <br /> effective. By letter dated March 9, 2010, the EHD approved an SVE/IAS pilot test. The <br /> sparge wells are scheduled for installation in:May 2010. <br /> 7- 15615 Seventh Street, Lathrup, CA, Claim Number 367- You concur with an EHD <br /> approval by letter dated January 8, 2010, conducting an oxygen injection pilot test. The I <br /> EHD approved •collecting groundwater parameters needed to show that low oxygen <br /> concentrations are a limiting factor controlling natural attenuation and that injection of <br /> oxygen may be effective for enhancing natural attenuation A feasibility study is <br /> pending. <br /> q 11530 Eight Mile Road, Stockton, CA, Claim Number 3668: You concurred with the <br /> EHD directive-to conduct ozone sparging pilot test. At this time there is an access <br /> problem for installing the sparge wells at the proposed locations are on a levee and the: <br /> Reclamation District has not yet granted access. <br /> 814 Charter Way, Stockton, CA, Claim Number 6793. You recommend that the EHD <br /> consider site closure; at the time of preparation of this letter the monitoring wells on the <br /> site are being destroyed_ As soon as .proper disposal of investigation-derived wastes': <br /> has been received, a closure letter will be issued - <br /> j <br /> 5491.F Street, Banta, CA, Claim Number 889: You recommend that the EHD consider; <br /> site closure. A monitoring well installed to further.investigate high concentrations of total <br /> petroleum hydrocarbons quantified as motor oil (TPHmo) in a sand unit potentially <br /> contributing to a nearby domestic well has been installed and monitored twice; the <br /> results of the second monitoring event are still pending- The SVE system and ozone <br /> injection system have been offline for several months and rebound testing is in <br /> progress. Assuming favorable results from the groundwater monitoring and rebound <br /> monitoring, the EHD will most likely start the closure process. <br /> 620 W. Charter Way, Stockton, CA, Claim Number 4954: In 2008 and 2009, you <br /> recommended implementation or enhancement of groundwater remediation in the <br /> deeper zones on the site, generally deeper than 50 feet below surface grade (bsg); to <br /> date remediation of deeper groundwater has not been implemented. This year you <br /> recommend consideration of the site for closure. <br /> In response to free product encountered in shallow monitoring well MW 15-50 in January <br /> 2009 and high concentrations of total petroleum hydrocarbons quantified as gasoline <br /> i <br /> 5-Year Reviews for March 2010 Comment Letter 0410.doc <br />