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TR05 <br /> April 24, 2019 <br /> JPL <br /> Colorado Division of Reclamation, Mining and Safety JUN 2 6 20i9 <br /> Attn: Mr. Patrick Lennberg DIVISION OF RECLAMATION <br /> 1313 Sherman St, Rm. 215 MINING AND SAFETY <br /> Denver, Colorado 80203 <br /> RE: Technical Revision Request to modify the Ground Water Monitoring Program for Pueblo <br /> East Pit, File No. M1986-015. 3 <br /> a � <br /> �$Ch <br /> b <br /> Dear Mr. Lennberg, <br /> Castle Concrete Co. (CCC)on behalf of Continental Materials Corporation(CMC) is submitting the <br /> attached documents, requesting a revision to the Ground Water Monitoring Program for the Pueblo East <br /> Pit, File No. M1986-015. The existing monitoring program monitors a specific set of ground water <br /> monitoring wells,twice per month, for ground water elevations. No ground water quality data is <br /> obtained. Since 2012,we have developed an extensive database of ground water elevations for the <br /> sampled wells.(The wells known as the Thunderbird set of wells, has been sampled beginning in late <br /> 2012 and the Pueblo East, Phases 1 and 2 and the 25th Lane Residences Wells beginning in 2014.) <br /> We have attached two maps which show the locations of the two sets of ground water level monitoring <br /> wells. The following table describes the present ground level monitoring program and the proposed o <br /> revision: <br /> y cn <br /> Table 1,Existing and Proposed Reduction in Ground Water Wells Monitoring: <br /> Ground Water Level Current Ground Water Well Proposed Ground Water Well <br /> Monitoring Well Set Monitoring Frequency Monitoring Frequency <br /> Thunderbird Wells Bi-monthlyQuarterly or as available <br /> Phases 5,6,8,& 9 Bi-monthlyuarterl <br /> 25th Lane Residences Bi-monthlyMonthly or as available <br /> Phase 7 Residences Bi-monthlyMonthly or as available <br /> Phases 1,2,7 Bi-monthlyMonthly <br /> Note: The attached maps do not show two wells which are sampled in Phase 7. <br /> Respectfully, <br /> H. Bruce Humphries <br /> Consultant to CCC <br /> Encl: <br /> Technical Revision form <br /> Figure 1, Pueblo East Pit Phases 1 & 2 and 25th Lane Residences Well Location Map <br /> Figure 2, Thunderbird Ground Water Monitoring Well Location Map <br /> 1 <br />