Laserfiche WebLink
-~- west+eanwaraer&7and,InC RECEIVED <br />~~ APR Q 9 2~r~ <br />Apri13,2002 Oiuision of Minerals and Ger'":.` <br />Mr. Gregg Squire <br />Colorado Division of Minerals and Geology <br />DepatRttent ofNatural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Logan Wash Mine Evaporation Pond Maintenance Costs <br />Dear Gregg: <br />It was a pkxswe talking with you artd Carl Mamt on Tuesday, March 26, 2002. As peryour r~1, I have <br />estinramd the amoral maintenance horns requited frxmaintenartoe ofthe evapor~ion pond and related <br />sWcdtres at the Logan Wash Mme facility owned and operated by Occidental Oil Shale, Inc. <br />To date, the maintenance work that has been conducted on a weekly basis includes the following: <br />1. Monitor and measure flows in retort discharge pipeline at upper and lower manholes, <br />2. Check and record condition of leak detection vault at evaporation pond, and <br />3. Inspect general condition of pond (security fencing, pond volume, liner condition, etc). <br />M addition, National Pollution Discharge Elimination Sys6etn (NPDES) sampling is cautently oorrdtrcved at <br />OutfaU 002 (the Research Mine). When discharge is presettt, usually April thraiglr August, sampling is <br />conducted on weekly (2 conshititerrfs), monthly (11 mttstigrar~), and gt>atterly (14 catstittterr~) schedules. <br />The sample events require more time baratrse of the preparation for, acrd dre colk:ction acrd haallmg ofa <br />water sample at Out611002. Up fi 14 oonstihrents are analysed by the contracted labaatory. Should this <br />permit tentafrr agive fora period oflime afterfmrnal mine ckurae, additional labor wr71 be required to <br />conductthe required sampling. Also, it is Itlcely that some monitoring will be requved of any passive mine <br />wata~treatmetrt disclunge (this may be aNPDES-type ofpetmit). <br />'[tie above tasks are crmerrtly being cartdrrcrood by two field per~rrel as this simplifies the tasks oftlow <br />measurement in The manhole kxatior-s arm addresses health and safety cotuxrrts. However, the work can be <br />mndtaxed by one person. The estimated time m carr&tcx tasks 1 thnwgh 3 above by one person, irtchrding <br />travel time Sum Grand Jurxkrory is 3 hours per week. Sampling of the existing Outfa11002 requires an <br />additional 1.5 to 2 hags of labor per week during the discharge period. 'Therefore, the total armual labor <br />hours requoed for Logan Wash Mine monitering is 156 m 196 Naas. Under a dilfaerr[ ck>stue progarn the <br />above maintenatroe sohedrrle could cor>ceivably be reduced This wodc does Trot include tardergmund. <br />inspections or othar general surface inspection ofthe mine property. <br />Approximate field labor rates would typically range from $50 to $70/hour. <br />[ hope this estimate is useful in recalculating bond amounts for the Logan Wash Mine facility. If you <br />have any further questions, please corttaci me at 974242-0170. <br />Applied Eazth Sciences 743 Hoozon Court suite 330, Gram Junction, CO Ot5116 <br />Pbont: (470) 2t2-0170 Fax: (970)?A?`({270 <br />