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San Joaquin County Environmental Health Department RE: Beneto, Inc., 749 E. Charter Way, Stockton, CA Page 2 of 3 Class II neat cement, which will be circulated through the annulus to the surface and allowed to cure for a period of at least 24 hours, pursuant to Bulletin 74-90, prior to continuing work on the well. The well screen and casing (to a total depth of 95 feet bgs) will consist of 2-inch diameter, schedule 40 PVC . Centralizers will be placed at depths of 75 feet bgs, 50 feet bgs, and 25 feet bgs to center the well casing within the conductor casing. The pre-packed filter pack/well screen (lowermost 10 feet of well) will consist of #3 sand contained within a 2 %/ inch diameter wire- mesh screen. The well screen will have 0.020-inch wide slots. Additional #3 sand will be added through a tremie to fill the gap between the pre-packed screen and the borehole wall. The filter pack will be placed to extend approximately 2 feet above the screened interval. A transition seal consisting of coated bentonite pellets will be placed using a tremie in the interval of 81 -83 feet bgs. After the bentonite pellets are allowed to expand for a minimum of 30 minutes, the remaining annulus will be sealed with neat cement grout, which will be emplaced with a tremie system. MW18C Centralizers will be used at depths of 90 feet bgs, 60 feet bgs, and 30 feet bgs to center the conductor casing in well MW18C. The conductor casing will be set to a total depth of approximately 115 feet bgs. The conductor casing will be grouted through the shoe with Class H neat cement, which will be circulated through the annulus to the surface and allowed to cure for a period of at least 24 hours, pursuant to Bulletin 74-90, prior to continuing work on the well. The well screen and casing (to a total depth of 140 feet bgs) will consist of 2-inch diameter, schedule 40 PVC. Centralizers will be placed at depths of 110 feet bgs, 70 feet bgs, and 30 feet bgs to center the well casing within the conductor casing. The pre-packed filter pack/well screen (lowermost 10 feet of well) will consist of #3 sand contained within a 2 %-inch diameter wire- mesh screen. The well screen will have 0.020-inch wide slots. Additional #3 sand will be added through a tremie to fill the gap between the pre-packed screen and the borehole wall. The filter pack will be placed to extend approximately 2 feet above the screened interval. A transition seal consisting of coated bentonite pellets will be placed using a tremie in the interval of 125428 feet bgs. After the bentonite pellets are allowed to expand for a minimum of 30 minutes, the remaining annulus will be sealed with neat cement grout, which will be emplaced with a tremie system. Surveyin¢ A State licensed surveyor will survey the elevations of the casing collars of the new wells to a vertical accuracy of 0.01 feet and the latitude and longitude of the well will be established to an accuracy of one meter or less. The surveyor will be directed to also survey key site features, such as j building corners, so that Lee & Pierce, Inc. can prepare a more detailed site map. I i � U:\L&P\Beneto\Charter\deepwells_addendum.doc f