2017-03-17_REVISION - M2002004 - Laserfiche WebLink

Home Browse Search

e TECHNICAL REVISION GCC owns and operates a cement manufacturing plant located in Pueblo. The Pueblo Plant also operates an on-site limestone quarry. The quarry operates under the Mining Permit No. M-2002- 004 issued on August 29, 2003. With this application, GCC is requesting a technical revision to its 112 Permit Application submitted in 2002. Specifically, this TR requests DRMS to include Monitoring Well 006 (MW006) to its groundwater monitoring program. As of this time, one monitoring well (MW005) is active and is being monitored for groundwater semiannually. This monitor well has not produced water since it was installed. Although the historical groundwater monitoring data provides a good technical justification for no additional monitoring, GCC proposed, in its April 22, 2016 letter (Attachment 1) to install an additional well along the most likely pathway for saturation to develop. DRMS acknowledged adequateness of the location in its May 24, 2016 letter(Attachment 2). Accordingly, GCC requests that DRMS review this TR for approval. SUMMARY As noted above, GCC is requesting a TR to install a monitor well to be located between the quarry and the clinker dome. Please see the following Attachments for the details and plans: A—Monitor Well Design— Monitoring well be constructed in accordance with current Colorado Division of Water Resources rules (2 CCR 402-2). Scope of drilling and well completion include: B—Well Completion and Development— 1) Decontaminate drilling and sampling equipment prior to arriving on site and between uses; 2) Advance borehole with hollow stem auger and continuously core (starting at the base of colluvium) to the top of or just into the Carlile Shale; 3) Recovered core samples will be inspected and logged by a GCC geologist or engineer; 4) Drill cuttings will we spread thin on site; 5) Any produced water be allowed to infiltrate near the wellhead; 6) Construct monitoring well in accordance with current Colorado Division of Water Resources rules (2 CCR 402-2); 7) Construct well inside the auger string using 2 inch I.D., schedule 40 flush joint threaded PVC materials. 8) If no saturation is observed at the Fort Hayes/Codell contact, screen the well from 5 feet above the Fort Hayes contact to the top of bedrock (Carlile Shale); 9) Use machine slotted well screen(0.010 inch) fitted with threaded bottom cap; 10)Place filter material (10/20 Colorado Silica Sand) to a level of approximately 2 feet above the top of the screen interval;