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rN'N PIN __ „- _ -. _ F p e . r - ARANI)CONMENT Of- I NDUS TR I AL WELLS As pact of the site clean-up, and t the request of thr DHS, the three industrial wells were abandoned on October 19 and 20, 1959 by Valley Drilling, Galt California, a water well drilling contractor . The wells were 1601 , 130' and 324' deep. The well casings were cut and recovered from 6 ' below ground level on all three wells. The two shallow wells were filled with cernent from bottom to the top of the casing stub. The deep well was filled with gravel from bottom to about -200' and from there to the top of the casing stub with cement. Plugging operations were witnessed by the DHS (Appendix A-21 ) . ACTIOQN'S TAKEN ON AND SUBSEQUENT TO DECEMBER 13, 1959 On December 13, 1959, Consultants W. J. Hunter and D.R. Allen (DRA) , registered geologists , visited and examined the 1SC Winery Site with Richard Thorpe, President of ]TO. The entire problem of the excavation and the activities that had taken place were dis- cussed. The three groundwater monitoring wells were located and the excavation and spoil piles examined. After returning to the JTO office, all files were opened to the consultants and all data thought pertinent regarding the subject project were selected for copying. O,ving to the approaching holidays and prior cormittments of the consultants, very little work was accomplished during the remain-- der of 1989. As a first order of business , a topographical surveyor was hired to re-establish the monitoring well elevations and to run enough vertical levels to produce a topographical con- tour map of the excavation (Fig. 4) . The survey was run on January 11 , 1990, under the supervision of JTO and DRA. On the same date, DRA examined all spoil piles and the open excavation. Once again, it is emphasized that DRA never saw the open excavation when it was 45' deep: it had already been partially filled prior to the December 1989 visit . Also, Spoil Pile V 3 vias gone, having been used to partially fill the excavation. The spoil in Pi le 11 2 was examined Fit. sight and smell . Figure 7 shows photographs typical of the Ic..vy, bunker- type oil that was removed from the excavation near the bottom, at about -40 ' -. 1 . Figure S has two views of Spoil Pile 11 2. which contains about half of the polluted soil . Spoil Pile 11 1 , somewhat smaller than it 2, contains the remainder of the contaminated soil . As noted earlier , Spoil Pile ,l 3, which contained clean soil , was returned to the excavation. filling it to its present depth of about .-30' . Spoil pile 1l 2 is stacked on the plastic covered foundation of former building "A" As. can die seer, the plastic roiering ari o.... tires used for weighting it down are almost all gone. 11