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ARCO Service Station No_.2186 Page 2 3212 North California Street January 4, 2012 Stockton, California 94570 ,limits may be destroyed by pressure grouting from 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 than the auger originally utilized to install the well, and the soil around the cut-off casing removed to a 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 12 inches of neat cement grout poured 6 inches above and 6 inches below the top of the cut-off casing. EHD records indicate the presence of `nested' wells installed using ten-inch augers. The EHD has found destruction results of nested wells are best obtained when an auger larger than the original auger is 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_ All groundwater displaced to the surface during grout installation shall be pumped out of the excavation to allow forthe 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; one in the City of Stockton right=of-way on American Street, and one at Oak Park. .Please submit a copy of the encroachment permit and access agreement along with the EHD Well and Boring Permit Application forms for these wells. After the EHD has approved the well destruction scope of work proposal, you may submit an EHD Well and Boring Permit Application form, Master File Record form and the 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 14 wells currently are installed. A fee of $2,875.00 (14 x $125.00) + ($375.00 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.) If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney@sjcehd_com. Victoria L. McCartney, REHS Adrienne Ellsaesser, RENS Senior Registered Environmental Heal Specialist Acting Program Coordinator i c: Mr. James L. L. Barton, PG, California Regional Water Quality Control Board Central Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, CA 95670 Mr. Kirk Larson, PG, State Water Resources Control Board underground Storage Tank, PO Box 944212, Sacramento, California 94244-2120 Ms, Catherine Francini, Stantec Consulting Corporation, 3017 Kilgore Road, Suite 100, Rancho Cordova, California'95670