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purposes of reporting, since there is some potential that they may be re -disturbed for pipeline repair or iirairrteiraricr
<br />in the future.
<br />AL the time of final reclamation, the 51VIN installation will be reclaimed by plugging and 3ealirig the bri,chole,
<br />consistent %with State ,rqurrerrlCrrt3' Cutting -off Elie borehole casing below grade, regrading the pad and
<br />load to their .approximate original Configuration, soil material replacement, and reseeding with TUs standard
<br />Rangeland Seed Mix Soil. For the pipeliire irr3tallatiorr3, the mcCC33 ii3er3 will be reriroved or demolished to 3 -tees
<br />below glade, acid Elm p;pel;ries will be cut-ott below grade, capped, and abandoned in place. At that time the
<br />disturbance associated with the access risers will be regraded, soil materials ,eplaCed, acid tlic3c miCm3 ma well m3 airy
<br />pipeline areas reghiriig irairTCiance will be ie3eeded. Reseeding of the disturbed areas will be Completed during
<br />the fist appiopr;ate planting period following soil material replacement.
<br />In order to provide irifoi enation ore formclatiorr CoidrtroraS and material CharacteriSLICS to Support design and Construction
<br />c;f dee frILLlre passi,,e water treatment system, TU will coordinate with their design contractor, LH!M Hill to complete
<br />geotechnical investigations in the area identified for the passive ticatireit The geoieelirr;Cal irvestrgations will
<br />gerreially follwv tLe pi met;�e� outl;lied Crider the approved plans for "Field Geotechnical investigations" (page 2.05-
<br />84.10) and will specitically involve Completion of eight shallow test -pits as shown by rigire EX49EE-F1. The to"t-pit"
<br />will be completed with a backhoe to deptlr3 of mppro,,i,aatelyl5 tees; and Elie geotechnical evaluation will involve
<br />physical examination of Elie soil profile, and Collection, examination, and testing of soil samples. The work will be
<br />done under Current snowpack Conditions, with no road constiuctiorr. A 3inall dot-er will Blear any excess snow and
<br />pack:-dom, a grow ba3c fol the backhoe and pickups to access the LeSL-piL locations. Soil materials will be
<br />separated during excavation, and it there is a discernible ditterence between topsoil and SLrbsoil, they will be
<br />stockpiled separately. Each test -pit will be backfilled ore corrrpletiorr of 3arrrpl;ng w;ill the e„cavated material and
<br />leveled. Tc3i-p;t loe<<tio,,s vvill be reseeded in the spring. iL should be noted that all minor Surface disturbance
<br />associated with the site geotechnical investigations Calls within the footprint of previous CulTutal LCZ6ulCe 3urvCy
<br />completed and 31.ibrrritted for dee 5MN P;pel;ne acid fLitare passive treatment system (MR15-288).
<br />Fresh -Water System Modification - LCs fm3h-water 3y3terir way rodded to incorporate Elie million -gallon
<br />3101'agC tank Cuirelitly be;erg Used by Colorado Yampa Coal Company. A water -line was constructed which ties -in
<br />the million -gallon tank. Llae exisLing well, and the new fresh -water borehole. The location of this Sy3ttir i3 31rowi
<br />Oil Map 24, Surface racilit;c3.
<br />Installation of the water -line reLluired excavating a trench approximately 7 to 15 feet in depth. A3 alrGwir ore Map
<br />24, SUrface facilities, the majority of the duel, wok Ueeurred within previously disturbed areas. For the section of
<br />pipe la;d ;rr the d;sttirbed area, a work corridor, approximately 3U feet wide, was used. The material excavated from
<br />the trench was placed adjacent to it, and after the pipe was placed the timich way backfilled. For the undisturbed
<br />area the top3o;l, alipioxiriately 2 feet ;rr depth, was removed from the work area, and temporarily Stockpiled
<br />adjacent to it. After the trench was excavated, Elie water line placed, and the trench backfilled, the topsoil way
<br />replaced.
<br />A borehole, approximately 150 teet in depth, was drilled into the in;ne working3 and Caged. The borehole ;J
<br />approximately 12 iiiclie3 ire dlamme, mud the Cm3irg ;3 a iron. ;real 8” diameter. The annular space was grouted from
<br />the bottom to [lie top. The drill -pad reLluired for this project was constructed on both disturbed and undisturbed
<br />lands. The portion Constructed on undisturbed areas required salvaging approxirirately 24-irrel,e3 of top3o;l. The
<br />top3o;1 vva3 Tcrrrlwr.riily 3torkp;led ad�acerrt to the pad. once the system was working, the topsoil was redistributed
<br />and seeded with the rangeland seed mixture. A temporary access road was constructed to the drill -site aao3s all
<br />undisturbed area. Approximately 28 irrCLe3 of topeil wm, 3mlvmged hoer, the load coir;dor and temporarily
<br />vv;hdro,v,ed to the side. After drilling and setting the casing Lhe road was reclaimed by blading the topsoil back over
<br />the area, and the area seeded with the rangeland seed ihi,.tL iV. Htty future ZL=33 iity dIC mrem will be almig tie
<br />C,i;31;ig railroad Tr<<CI:3. G;vCi ilre I;err;ted arnotrlt of disturbance and rapid reclamation of the area it is requested
<br />that this area be identified as a Small Area Exemption. Therefore, no sediment Control system will be in3talled.
<br />Atter the system is no longer heeded, the borehole will be grouted tion, the bottom to the top. An UCLo plug will be
<br />placed 10 feel below the surface, and the remainder of Elie hole will be backfilled with soil material.
<br />MR 16-295 2.05-51 04/01/16
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