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Chronology of Conditions and Events at the Boyd-Freeman Ditch and Al Pit <br /> Year/ Description of Conditions/Events <br /> Time Frame <br /> Prior to • The Al gravel pit location was formerly grazed prairie land use. <br /> development of (See Appendix B, Figure B.12, which shows the conditions that <br /> Aggregate existed at the location of the Al gravel pit in October 1999,prior to <br /> Industries(Al) the Al gravel pit being constructed). (See Note 1 at bottom of table <br /> gravel pit in 1999 regarding Appendix B). <br /> to 2001. <br /> • When built,the Al gravel pit was in unincorporated Weld County. <br /> • A Special Review Permit was issued for the gravel pit by Weld <br /> County on October 21, 1992. The permit required grading to <br /> provide stabilized shoreline around the lakes and grading to control <br /> erosion. (Note that the Al gravel pit is now located within the <br /> Greeley City limits). <br /> 1999 to 2001 The Boyd-Freeman Ditch was relocated by Al to its current alignment: <br /> (sometime in this <br /> period, based on • The original ditch alignment had a direct path through the current <br /> aerial imagery) location of the gravel pit. <br /> • The ditch was realigned to allow more space for expanded gravel pit <br /> operations. <br /> • Construction of the ditch realignment was performed by Al. <br /> • The ditch remained as an open channel conveyance in its new <br /> alignment. <br /> • No known engineering design/drawings exist for the realignment <br /> project. <br /> 2007 • The last excavation occurred at the Al pit(per Al annual Division of <br /> Reclamation, Mining and Safety[DRMS] report, Feb. 2015). <br /> 2010(June) • A ditch failure/breach occurred where the ditch turns from west/east <br /> to south/north. <br /> 2011-2012 • BIC makes repairs to the ditch failure/breach that occurred in June <br /> 2010. <br /> • The Iverson/Martin Marietta gravel pit was developed on the west <br /> side of the bike path, east of the Cache La Poudre River. <br /> 2011-2012 • The open channel Boyd-Freeman Ditch was replaced with 48-inch <br /> HDPE pipe(Note: drawings show PVC pipe, but HDPE was <br /> ultimately used) <br /> o Design drawings were prepared for BIC (April 2011). <br /> o Engineering and construction was performed and paid for by <br /> the BIC. <br /> o Approximate cost of repairs: $720,000. <br /> 1 <br />