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_ 4t sT��Tus eNviaoNnneNrat,INC. 3330 Cameron Park Drive, Ste 550 Cameron Park, California 95682 (530)676-6004-Fax:(530)676-6005 February 2, 2012 Project No. 2129-0102-01 Ms. Lori Duncan RECEIVED San Joaquin County Environmental Health Department FF, 600 East Main Street s 2012 Stockton, California 95202 / _ Re: Evaluation of VW-6 Well Condition and Request for Deadline Extensfor"' Submittal of Revised Remedial Action Plan, 102 South Wilson Way, Stockton, California Dear Ms. Duncan: Stratus Environmental, Inc. (Stratus) has prepared this letter, on behalf of the Knowles Family Trust, in regards to the underground storage tank fuel leak case at 102 South Wilson Way, Stockton, California. Between November 2010 and June 2011, a previous consultant representing the Knowles Family Trust injected hydrogen peroxide into the subsurface at three wells located on the subject property (VW-1, VW-2, and VW-6) in an attempt to mitigate petroleum hydrocarbon impact to groundwater. After reviewing results of historical groundwater sampling, including data from the third quarter 2011, Stratus recommended, in a report dated October 24, 2011, that a revised groundwater remedial approach be developed for the site. After reviewing the October 2011 report, San Joaquin County Environmental Health Department (SJCEHD) issued a letter, dated December 8, 2011, concurring with Stratus' recommendation and requested that a modified Remedial Action Plan (RAP)be developed and submitted for agency review by February 3, 2012. Stratus has prepared this letter in order to request a 2-month extension for preparation of - the modified RAP. Since ending the hydrogen peroxide injection work, only one groundwater sampling event has been completed at the property. By extending the deadline for submittal of the modified RAP, Stratus will be able to incorporate the findings of the second post-remediation well sampling event into the decision making process used to develop the scope of work proposed in the modified RAP. It appears as though well VW-6 is obstructed at approximately 30 feet below surface grade. Based on information available regarding this well, VW-6 is screened from approximately 30 to 60 feet below surface grade, and thus the obstruction is near the top of the well screen At this time, Stratus is unable to identify a reason as to why the well has become damaged; however, the well appears to have become obstructed shortly following initiation of hydrogen peroxide injection into this well (noted by previous site consultant in February K:\Knowles-Wilson Way\Correspondence\knowles-wilson-extension.doe