SITE INFORMATION AND CORRESPONDENCE FILE 2

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Interstate Shell Page 3 of 3 620 West Charter Way December 2, 2013 Stockton, California 95206 Wells that have laboratory data from the last sampling event that report non- detectable concentrations of contaminants of concern and with acceptable laboratory detection limits, and are not in areas of known or suspected soil contamination, may be destroyed by pressure grouting form the bottom upward, while leaving the well casing in place. The top three feet or more of the well shall be drilled out with an auger that is at least one foot larger in diameter than the auger originally utilized to install the well, and the soil around the cut-off casing removed to the depth of an additional six inches below the new 'top' of the cut-off casing. The grout sealant shall spill out of the top of the well casing to form a mushroom cap seal with at least twelve inches of neat cement grout poured six inches above and six inches below the top of the cut-off casing. • All groundwater displaced to the surface during grout installation shall be pumped out of the excavation to allow for EHD inspection and verification that the well has been properly destroyed. Contaminated groundwater pumped out of the excavation shall be containerized for proper disposal. After the EHD has approved the well destruction scope of work proposal and the public participation comments have been properly addressed, you may submit an EHD Well and Boring Permit Application form along with a Master File Record form, access agreements from property owners where off-site wells are located, and appropriate fees for each parcel. The permit fee for the destruction of each well is $125, along with a $375 Inspection Activity fee per parcel. A review of the site records indicate that twenty monitoring wells currently are installed. A fee of. $4,000.00 (20 x $125 + $375 x 4) will be required for the well destruction permits. The EHD will issue a closure letter once the sixty-day public participation notification requirements and opportunity for public participation in the case closure decision process have been completed in accordance with the LTCP, all wells have been property destroyed and waste manifests have been submitted to this agency. Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney(a-,)sicehd.com if you have any questions. Sincerely, Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG Senior Registered Environmental Health Specialist Engineering Geologist c: Mr. Larry Silva, Conestoga-Rovers & Associates, 19449 Riverside Drive, Suite 230, Sonoma, CA 95476 Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670