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.s A13ANDONMENT 01= INDUSTRIAL WELLS As pact of the sate clean-up, and at the request of the DHS, the three industrial wells were abandoned on October 19 and 20, 1959 by !'alley Drilling, Galt California, a drilling contractor , The NwetIs were 160' , 130' and Siadeep, The well casings were cut and recovered from 6 ' below ground level on all Three wells . The two lost' wells were h cement from iillcd wit bot tem to the top of the casing Stub, The deep well was filled with gravel from 50t to,-n to about -200' and from there to the top of the casing stub �\,ith cement . Plugging operations +were witnessed by the DHS (Appendix ACTIONS 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 ISC Wi !ery Site will) Richard Thorpe, President of JTO. The entire problem of the excavation and the activities that had taken place were dis- cussed. The three ground\s-a er .monitoring wells were located and the excavation and spoil piles examined. after returning to the JTO office, all files were opened to the c:nsultants and all data thought pertinent regarding 1ho subject project were selected for copying. Owing to the approaching holidays and prior corrrrlittrnents 04 th, consultants , very little work was accomplished during the remain- der of 1959. .As a first order of busin^ss , a topographical i surveyor :vas 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 DRf', never saw the open excavation when it was 45' deep; it had already ween par-Eially filled prior to the December 1959 visit . A1ao, Spoil Pile # 3 wFson e, having been used to �.rartia] ly fill the: excavation. Theo spoil in Pile 1l 2 %vas examined by sight and smell . Figure 7 shaus photographs ty„.,i.cal of the heavy , bunker- type oil that u•as removed from the excavation near the bottom, at about -40 ' g• 1 • Sam Figure S has two views of Spoil Pile ll 2 , which contains about half of the po' l ted soil . Spoil Pile ,l 1 , somewhat smaller than ,l 2 , contains the .-entainder of the contaminated soil . As noted earl ier ,......Spoil.. P.iie_ ,l_ 3 : '•sh3ch....con aintd clean son1 , was returned _. _.. .s.__. to the excavation. filling it to its present depth cf about_.___ Spoil pile # 2 is stacked on the plastic covered foundation of building "A". As can be seen, the plastic covering and old former tires used for %weighting it down are almost all gone. lI gg I I'll