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December 12, 1986 <br />Project 116-1.5 <br />The following anticipated monitoring well repair and closure work will <br />require 30-60 days to complete, and will commence within 30 days of <br />approval of this plan by staff of the Central Valley Regional Water Quality <br />Control Board: <br />MW -1 and MW -2 <br />These monitoring wells are not included in the monitoring program, and will <br />be properly abandoned in accordance with state and local regulations. <br />MW -7 <br />A water -tight threaded cap has been put on the top of the well casing to <br />prevent surface water from flowing into the well. The concrete pad around <br />the well will be removed, and the surface seal will be inspected. If the <br />surface seal appears to be effective in excluding surface water, a new pad <br />will be constructed. If the surface seal is inadequate, the well will be <br />one of the first to be replaced. This well will eventually be replaced <br />because of the excessive length of the screened interval. <br />MW -9 <br />The broken irrigation line will be repaired. A water -tight threaded cap <br />has been put on the top of the well to prevent surface water from flowing <br />into the well. This well will eventually be replaced because of the <br />excessive length of the screened interval. <br />MW -10 <br />The cracked PVC cap has been replaced, and the wood chips that had <br />collected in the metal vault have been removed.. The locking vault will be <br />repaired, and a padlock will be installed. Water samples that were <br />obtained from this well on November 1.0, 1966, indicate that surface water <br />has flowed into this well, and it will be one of the first wells to be <br />replaced. The well will be closed in compliance with state and local <br />regulations. <br />MW -11 <br />The sleeve of PVC that has been set over the well casing will be glued <br />securely in place. The metal vault lid will be repaired, and a padlock <br />will be installed. If it :is evident by the results of the fourth quarter <br />monitoring for 1986 that surface water has flowed into this well, it will <br />be one of the first wells to be replaced. <br />- 2 - <br />GBetac_Associates <br />