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KEI-P89-1104 .P3 April 4 , 1990 Page 2 the existing well has been paved with asphaltic concrete and that an old concrete Christy box was placed around the well and remaining piping. The well seal appeared in tact. The well casing was locally exposed and appeared to be steel and about six-inches in diameter. The service station has recently been connected to the municipal water system and disconnected from the on-site water well. 2 . SITE DESCRIPTION The service station occupies the northwest corner at the intersection of Willora Avenue and Pacific Avenue in Stockton, California. A Location Map and Site Plan are attached to this Work Plan. PROPOSED FIELD WORK Well Destruction Details of the existing water well at the site were researched at the California Department of Water Resources (DWR) in Sacramento. Mrs. Betty Swatsenbarg of the DWR reviewed the State records on March 14 , 1990 and reported that no records were available for this well at the DWR. Based on Mrs. Swatsenbarg's extensive experience at the DWR, the subject water well was probably drilled and installed prior to 1951. At that time, steel casings were driven into the subsurface and the remainder of the wells were generally open below the casing. The following sequence of events is proposed to adequately destroy the existing water well based on the results of our recent site inspection and discussions with Mr. Harlin Knoll. A. The existing concrete Christy box, adjacent portions of the asphalt paving (estimated at a 2 to 3 foot diameter) , and the remaining piping at the well cover plate shall be removed. B. After the well cover has been removed, the well will be checked for depth to the water table surface and total depth. The volume of the water in the well will be calcu- lated assuming a six-inch diameter well. C. A minimum of three to four well volumes will be evacuated from the well using a bailer or a submersible pump. All purged water will be stored on-site in DOT-approved 55-