2014-06-25_REVISION - M1977522 - Laserfiche WebLink

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Environment, Inc. Page 7 Jane 25,2014 LGE Star Water Resource. is a revised copy of the MAP EXHI BIT F-RECLAMATION PLAN MAP (OPTION B). It has been revised to correct the acreages,to show the modification by the adoption of Option B, fix the owners list and structures list where mistakes were also found. EXHIBIT G -Water Information(Rule 6.4.7): The second paragraph of Exhibit G states that five monitoring wells have been Installed:on site,,however they do not appear anywhere on Exhibit C as stated. Please provide a map showing the locations of these wells,and the associated monitoring well boring and well construction logs for the five new wells. LG Everist will also need to commit to making the monthly groundwater level data collected a part of the annual report submitted to DRIVIS for this site. Only 4 wells were used not the-5 originally planned. I have added the 4 monitoring,wells to. lap Exhibit-C-1 - Current Conditions Map and provided a new map ekhibit in Exhibit G called MAP EXHIBIT G-2 -MONITORING WELL LOCATIONS, The monitoring well bore construction logs are attached and a Typical Monitoring Well Installation Sketch section to slow the well construction. Even though only 2 months-of data is available,the ground water Monitoring data Collected for each piezometer is provided. LG Everist,will commit to making e monthly groundwater level data collection a part of the permit and provide the information as part of the annual report for this site. EXHIBIT L-Reclamation Costs(Rule 6.4.12): Recalculation of the reclamation bond will be required. Please adjust the bond calculations to include the following: 100%of the cost of the western slurry wall must be submitted. DRMS'has-not yet been provided'with any detailed plans or design specifications for that slurry wall to-date.To qualify for the 20% bonding option, in addition to providing adequate plans and design specifications to DRMS for approval,the permittee will also need to provide construction QA/QC data to support that the slurry wall was installed In full compliance with the design specifications,-or pass the SEO testing criteria. So you are aware,the 20%bonding option "policy"for slurry walls, is currently under review by DRMS and may not be an available option In the future, I iave recalculated the Reclamation Cost estimate using your suggestion of including the I estern slurry wall at full cost since the detailed competition plans have not been submitted. L E may choose to supply the QA/QC and design documents at a later date and request a r duction to the 20% level should the,Division still be accepting that option. The existing exposed groundwater lake in the eastern area must be bonded for in some fashion. Bond may be calculated for the installation of a slurry wall to isolate It from the surrounding alluvial aquifer(see paragraph above for slurry wall calculation). Bond'for that area may also be determined using a defensible determination of cost for the placement of the amount of fill required to backfill the existing exposed groundwater area to no more than 6.1 acres of exposed groundwater,with the rest of the area backfilled to a Level at least two feet above the existing documented static water level.The backfilled areas must then be appropriately sloped and seeded.Areas to be re-sloped, otherwise re-graded, re- soiled,and reseeded should be shown on the provided reclamation plan map. en LGE opted to use Option B,I recalculated the bond to include backfilling the post- 1981 lace area to a least 2 feet above the ground water table. We believe there is enough material on the mine to avoid having to import fill material. If needed shale, could be mined from the reservoir area on the west parcel and used as fill. The slurry wall calculations include installing