SITE INFORMATION AND CORRESPONDENCE FILE 2

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I ARCO #2130 page 2 7906 N . EI Dorado Blvd , Stockton work plan addendum approval COMMENTS AND CONDITIONS (continued ) : • Ensure an adequate number of soil samples are collected and analyzed to support residual mass calculations and vertical soil plume delineation conclusions. Soil contamination detected in the deepest soil sample analyzed indicates that the vertical extent of the plume is not defined and additional vertical investigation may be warranted . • Existing "VW-7" is screened across two permeable zones and could be contributing to the vertical migration of dissolved petroleum constituents . VW=7 is to be destroyed by over-boring during this monitoring well installation phase. If a vapor well is needed in this area, then a replacement vapor well , "VW-7R" , should be installed in the vadose zone and above the historical depth to first ground water. The well schematic for VW-7R is to be submitted to the SJCEHD before the field work starts . • The report of findings for this phase is to be in the format of an f` updated Site Conceptual Model (SCM ) . Refer to EHD 's October 3 , {' 2003 comment letter for items of concern and items that were I missing in the first SCM submittal ( URS) and include them in the SCM update due at the SJCEHD within 90-days of the end of this field work. • Submit one SJCEHD Well Permit Application form and $89 fee for the f onsite wells and one application form and $ 89 fee for the offsite wells in a timely manner. A copy of the City of Stockton E encroachment and revocable permit is to be included with the offsite t application packet for MW- 14, 19 , & 21 . REASONS FOR DISAPPROVAL OF THE WORKPLAN rH&S Section ` 25296.10(c)(3)1 : • none . "t BY t Michael Infurna , REHS . (2K9 ) 468-3454 r F` E cc : CVRWQCB — James L . Barton , Sacramento . SWRCB — CUF — Mark Owens, Sacramento , Secor — Kristin Shelton , 3017 Kilgore Rd , #100 , Rancho Cordova. 95670 [X] electronically mailed to consultant on : i.