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RPM,Inc. <br /> R Q ChristoPlrr J.Saruhez <br /> lJ�l 1 Jeffrey <br /> Daniel 0.O.Nie Nie <br /> me6 <br /> �.._Water Consultants, Inc. Jonathan D.George <br /> Michael A.Sayler <br /> Charles E Stanaone <br /> Kristin L Wynne <br /> Austin P.Malotte <br /> August 16.2019 <br /> Patrick Lennberg <br /> Colorado Division of Reclamation.Mining and Safety <br /> 1313 Sherman Street.Room 215 <br /> Denver.CO 80203 <br /> RE: Adequacy Review.Technical Revision(TR-05):Pueblo East.Permit No.M-1986- <br /> 015 — Additional Information Regarding Request to Modify Ground Water <br /> Monitoring Program <br /> Dear Patrick: <br /> This letter presents additional information regarding the request to modify the ground water <br /> monitoring program for the Pueblo East Pit.Permit No.M-1986-015 as requested in your <br /> letter date July 1.2019. <br /> Background <br /> Castle Concrete Aggregates (CCA). on behalf of Continental Materials Corporation. <br /> submitted a Technical Revision(TR-05)for the Rieblo East Pit.Permit No.M-1986-015. <br /> The existing monitoring program has historically monitored a specific set of monitoring <br /> wells. twice per month. to determine water level elevations and update hydrographs for <br /> each monitoring well. Since 2012. CCA has maintained an extensive database of water <br /> level elevations for the monitoring program wells. As mining has progressed through its <br /> phases, some of the wells were mined through and no longer exist. No additional water <br /> level data is available for wells that %vere mined through. Similarly, some wells have <br /> become inaccessible due to land use considerations. <br /> Figure 1 presents the location of existing and abandoned monitoring wells and includes the <br /> approximate date of monitoring well abandonment. The dates represent the date the <br /> measurement of the wells was abandoned after which no additional depth to water data was <br /> collected. <br /> The requested change to the monitoring program is to reduce the measurement frequency <br /> from bi-monthly to monthly for the Phase 1.2 and 7 monitoring«-ells. <br /> RPM,Inc.,25049 E.Alder Dr.,Aurora,CO 80016 Phone:(303)854-7499 Email:h1humphries2@comcast.net <br />