SITE INFORMATION AND CORRESPONDENCE_FILE 2

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U-Haul Facility No. 710050 Page 3 of 4 2701 North Wilson Way December 13, 2013 Stockton, California 95215 • Wells that have laboratory data from the last groundwater 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. • EHD records indicate the presence of 11 `nested' wells [MW-1(A/B) through MW-6(A/B); MW-9(A/B); MW-10(B/C) through MW-12(B/C); and VE-1] installed using 6%-, 10'/4- and 12-inch diameter augers. The EHD has found destruction results of nested wells are best obtained when augers larger in diameter than the original augers are used and centered on the deepest casing (which is off-center in the original borehole). The auger needs to be sized sufficiently to reach out and remove all well casings, screens, filter packs, and grout sealant installed during construction. • This site has a number of wells located off-site in the City of Stockton right-of-way. Please submit a copy of the encroachment permit issued by the City of Stockton when submitting the EHD Well and Boring Permit Application form for these wells. • This site has a number of wells located on an adjacent parcel. Please submit a copy of the access agreement signed by the adjacent parcel owner when submitting the EHD Well and Boring Permit Application form for these wells. 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, encroachment permit issued by the City of Stockton, access agreement from the property owner 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-three monitoring wells, six vapor extraction wells and thirty-two air sparge wells currently are installed. A fee of $8,750.00 (61 x $125 + $375 x 3) will be required for the well destruction permits. (To determine the fees for nested wells, each nested well is considered as one well for permitting and fee purposes.) 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.