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7-Eleven Store#14117 Page 2 of 3 2725 County Club Boulevard February 20, 2014 Stockton, CA 95204-3937 Please submit a scope of work proposal that details the conditions and construction of the wells and methods and materials to be used to destroy them. To be issued a well destruction permit, the proposal must address the concerns of the EHD and the San Joaquin County Well Standards requirements, such as: • Wells that have laboratory data from the last sampling event that demonstrate the presence of any contaminants of concern remaining in groundwater are to be destroyed by removing all the contents of the well (well casing (except steel conductor casing), screen, filter pack, grout sealant]; the cleared borehole is then to be sealed with neat cement from the bottom upward to the depth of three to five feet below grade. • All wells with unknown construction and/or located in an area of known or suspected contamination are to be destroyed by removing all the contents of the well [well casing (except steel conductor casing), screen, filter pack, grout sealant]; the cleared borehole is then to be sealed with neat cement from the bottom upward to the depth of three to five feet below grade. • 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. • This site has two wells located off-site in the City of Stockton right-of-way. Please submit a copy of a valid encroachment permit 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 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 indicates that seven (7) Monitor Wells; MW-1, MW-3 thru MW-8 and five (5) Oxygen Injection Wells; (1-1 thru 1-5) currently are installed at the site. A fee of$2,250.00 (12 x $125 + $375 x 2) will be required for the well destruction permits.