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NANO, 7-Eleven Store No. 19976 Page 3 of 3 1399 North Main Street December 24, 2013 Manteca, California 95336 • 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 a number of wells located off-site in the City of Manteca right-of-way. Please submit a copy of the encroachment permit issued by the City of Manteca when submitting the EHD Well and Boring Permit Application form for these wells. • EHD records indicate the presence of four 'nested' wells [MW-1/MW-1A; MW-4/MW-4A); MW-5/MW-5A; and SP-1/SP-1A] installed using eight-, ten- 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. 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 Manteca 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 eight monitoring wells, three oxygen-injection sparge wells and five soil gas probes currently are installed. A fee of $2,750.00 (16 x $125 + $375 x 2) 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. Please contact Vicki McCartney at (209) 468-9852 or vmccartney@sjcehd.com if you have any questions. Sincerely, Victoria C. Henderson, Jr., PG McCartney, REHS U Senior Registered Environmental Health Specialist Engineering Geologist c: 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 Ms. Danielle Manning, Stantec Consulting Services Inc., 3017 Kilgore Road, Suite 100, Rancho Cordova, California 95670