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TETRA TECH <br /> June 27, 2018 <br /> Mr. Joel Bolduc <br /> Aggregate Industries <br /> 1687 Cole Boulevard, Suite 300 <br /> Golden, CO 80401 <br /> RE: Monitoring Well and Staff Gage Monitoring Data Hazeltine Resource June 2018, Adams County <br /> Colorado <br /> Dear Mr. Bolduc: <br /> This report presents the monitoring well and staff gage data for the Hazeltine Resource in Adams County <br /> Colorado. Included herein are data tables and graphs for Wells HZMW-2, HZMW-11A and HZMW-11 B and Staff <br /> Gages 2 and 11. <br /> The data indicate that the operation of the Orr drain has lowered the ground water levels observed in HZMW-2 <br /> approximately two feet(2)since January 2017; a time of high flow in the Bull Seep. Water levels in wells HZMW- <br /> 11A and HZMW11 B have likewise declined since January 2017, approximately one-foot(1') and one-half-foot <br /> (05) respectively(Figures 1 through 3). <br /> Data for Staff Gage 2 and 11 are presented on Figures 4 and 5. Staff Gage 2 is located at the upstream end of <br /> the Orr Drain and demonstrates that the drain has remained open since March 2018 as evidenced by the water <br /> level being slightly above the drain invert elevation. <br /> If you have any questions, please call. <br /> Regards, <br /> TETRA TECH <br /> Justin Stoeber, P.E. Tom Hesemann, R.G., C.E.G. <br /> cc: Connie Davis <br /> P:\23514\200-23514-18001\Docs\Reports\AI Hazeltine Mon Well&Staff Gage Mon Report 2018 06 27.docx <br /> Tetra Tech <br /> 1900 S.Sunset Street, Suite I-E, Longmont, CO 80SO I <br /> Tel 303-772-5282 Fax 303-772-7039 www.tetratech.com <br />