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Chevrnn U.S.A. Page 27 During the attempt to sample monitoring well MW-2 it was observed that upon �^ removing the Christy-box lid,water was observed in the vault with floating oil and/or gasoline. The water was removed prior to attempting to remove the well's locking-cap, The locking-cap was observed to be loose and easily removed. Upon removing the well cap, oil stains along the inside of the upper portion of the well casing were a observed. These stains had apparently originated when petroleum contaminated water had flown down the insides of the well casing. It had been names&Moore's intention to sample the previously existing wells and to compare those results, specifically monitoring well MW-2,to the recently constructed monitoring well MW-2A. It was suspicious that the results from the two adjacent wells, MW-2 and MW-2A,had such significant differences in test results. It :.� became apparent from the observations of monitoring well MW-2,that surface .w contamination was entering the well and contaminating the groundwater. Dames&Moore i� observed automobiles frequently parked over well MW-2, from which oil residue may have originated. At tate request of Chevron USA, Dames&Moore re-constructed the Christy-bores and weli•heads of each of the original monitoring wells, MW-1, MW-2, MW-3, MW-4, MW-5, MW- 6, and MW-7. Dames &Moore's July 1, 1990 report summarized the re-construction of r� these welis'Christy-boxes and well-heads. A copy of that report is included in Appendix f=, at the end of this report. The photographs on Plate 2 in the July 1, 1990 report show the surface and the old Christy-box of monitoring well MW-2. These photographs illustrate the oil-stained asphalt surrounding the well,the water in the k`+ well head and the general condition of the Christy-box and lack of proper sealing. _ l 15000-205-044 _