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<br />G A M H A <br />aoww~rsws [nwwsss <br />• LAND wsvcross <br />.~.......~.., w...~...... <br />pwewc a~oraas-:aae <br />rAA: a~oia~s-~4~o <br />f 1~ NtwTN STNar, <br />aOITt 21• <br />t•4. ~; t14~ <br />a~woes swwiwas, <br />COBRA OO •1 ~14a8 <br />April 7, ?005 <br />Celina Akin <br />Soivav Chemicals <br />2717 Ctv Rd 21 ~ <br />`. Parachute. CO 81635 <br />i <br />VIA FACSIMILE: 970-285-6393 <br />Re: Well ZO-12 P:ecance Basin. Subsidence <br />Dear Celina: <br />per your request, Gamba 8t Associates, Ina has performed a t3eld survey of the <br />area surrounding the regraded Well 30-12 site. The survey was conducted in order <br />in determine if any regional subsidence had occtured in the azea dne to activity <br />associated with the well. Since the site grading had been modified subsequent to <br />otr< last visii, we had to survey the undisturbed area surrounding the well pad. <br />The survey indicated thaz there has not been any settlement in the area. The <br />average elevation difference in any given location was less than 0.6-:~ winch is <br />within the accuracy associated wtth correlating the latest surrey data with the <br />aerial survey conducted previously. The accuracy of an aerial survey to meet <br />National Map Accuracy Standards is Ix the conmur interval. The aerial survey <br />contour interval was 2.0-R;thesefore the accuracy is plus or minus 1.0-ft. <br />If you have any questions please give me a call. <br />sincerely, <br />Gamba & Associates, Iac. <br />.n <br />,f' <br />athan 1. Bell, Sluvey Manager <br />G:198 6 9 110 61Rroon sutuideace smlys,s March ?OOS.dnc <br />