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December 12, 1986 MW -12 Project 116-1.5 The metal vault appears to be secure even though the concrete surrounding the vault is cracked. A concrete pad will be constructed around the vault to insure that the vault remains supported. The ponded water inside the vault will be removed during well sampling in the future to prevent water from cascading over the top of the casing. A padlock will be installed on the locking vault. The casing is screened from 100 ft to 80 ft, with a slot size of 0.02 inches. The annular space surrounding the slotted interval was backfilled w:iLb #4 aquarium sand. A bentonite plug was placed above the sand, and the remaining annular space was filled with a concrete surface seal. MW -13 Ground water samples were obtained from this well on November 10, 1986. The results of analyses performed on the water indicate that surface water has flowed :into the well.. This well will be one of the first wells to be replaced. The well will. be properly closed in compliance with state and local regulations. MW -14 A padlock will. be installed on the locking vault. This well will eventually be replaced because of the excessive length of the screen interval. MW -15 The ponded water inside the vault will be removed during well sampling in the future to prevent water from cascading over the top of the casing. A padlock will be ip..st.alled on the Locking vault. This w^1.1 will eventually be replaced because of the excessive length of the screen interval. MW -16 The vault will be repaired, and a padlock will be installed. This well will eventually be replaced because of the 30 foot screen interval. MW's-3, 4,5,6 and 8 These wells were closed by removing the casing from the borehole, and pumping a cement grout with 15% bentonite into the hole using a slurry pump. A represenLative of the Central Valley Regional Water Quality Control Board inspected the area once the wells were closed. - 3 - GBetac_4ssociates