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*� P.O. Boz 576981 M-J. Kloberdanz & Associates Modesto,California 95357-6981 Environmental Assessment Phone: (209)577-8186 Fax: (209)577-8158 Ms. Lori Duncan May PfMwa San Joaquin County Environmental Health Division MAY 1 8 2004 P.O. Box 2009 Stockton, California 95201 ENVIRONMENT HEALTH PERMIT/SERVICES RE: Well Destruction: McDowell&Davis Towing, 1360 Escalon Avenue, Escalon On April 15, 2004 M.J. Kloberdanz & Associates contracted the licensed drilling company (C57-720904) V&W Drilling, Inc. to destroy the three groundwater monitoring wells at the above referenced facility. The wells were pressure grouted according to San Joaquin County Environmental Health Division "Well Standards" Section 13.17. REQUIREMENTS FOR DESTROYING MONITORING WELLS AND EXPLORATION HOLES: • The monitoring wells shall be investigated to determine its condition and details or its construction prior to its destruction. • The well shall be sounded immediately before it is destroyed to determine whether there are obstructions that will interfere with filling and sealing. • Any obstructions found in the well or boring shall be removed before filling and sealing operations begin. • The sealing material shall be placed under pressure to ensure that the monitoring well is properly filled and sealed. • Casing material may require perforation,or puncturing,to allow for proper placement of sealing materials. • The wells shall be filled by use of a tremie pipe or equivalent,proceeding upward from the bottom of the well or boring. • Sealing materials shall be placed in one continuous operation unless conditions in the well or boring dictate that sealing operations be conducted in a staged manner and prior approval is obtained from the Director. • Pressure required for the placement of sealing material shall be maintained long enough for sealing materials to properly set. • Verification shall be made to determine that an adequate seal has been installed by an EHD representative. • A hole at least one foot larger in diameter than the originally drilled hole shall be excavated around the outside of the well casing to a depth of 3 feet below the ground surface,and the well casing shall then be cut off 6 inches above the bottom of this excavation and removed. • The grout used to fill the well shall be allowed to spill over into the excavation,during the sealing operation,and fill it for a thickness of one foot and form a"cap"which has a diameter of at least one foot greater than the diameter of the originally drilled hole. • After the sealing operation and the sealing material have set,the excavation shall be filled with clean soil.