2021-03-16_REVISION - M1977300 (12)

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�k COLORADO LEGACY LAND RESPONSE TO COMMENT MATRIX Document e:`" o a e ock Pile Diversion Ch n — ecord of Construction Submission Date: December 22,2020 Reviewers : Amy Eschber ,er,Environmental Protection Specialist and Tim Cazier,P.E. Review Date: Feb ary 22,2021 Comment No. Section No. Page Line No. No. Comment Response to Comment 1 As-built Sheet 5 Slopes There is a slight difference in the gradient Slopes were recalculated to include the elevation at Drawings calculated from the drawing data between the Alignment Point(Sta.2+79.78). the grade breaks at stations 2+58.60 and 2+90.28. It is not clear as to whether the The slopes now match the reviewer's comment: elevation at the 2+79.78 Alignment Pt was Downstream of Alignment Point= 14.5% factored into eh gradient. Theis difference Upstream of Alignment Point=10.5% between 14.5%and 14.6%is likely a rounding error,but when the elevation at the alignment point is included,the slope is 13.2%(see Attachment A for DRMS calculations). Please address the gradient discrepancy and provide a corrected As-Built Drawing. 2 As-Built Sheet 6 Slopes There is one percent difference in the Slopes were recalculated to include the elevation at Drawings gradient calculated from the drawing data the Alignment Point(Sta.4+71.10). between the grade breaks at stations 3+86.41 and 4+75.55. It is not clear as to whether the The slopes now match the reviewer's comment: elevation at the 4+71.10 Alignment Pt was Downstream of Alignment Point= 18.5% factored into the gradient(see Attachment A Upstream of Alignment Point=17.1% for DRMS calculations). Please clarify whether this is a math or a typographic error, and provide a corrected As-Built Drawing. 3 As-Built Sheet 9 Elevations There appear to be 16 errors in as-built Site Plan Detail: Drawings elevations. Eleven apparent errors are in the -Twelve elevations where decreased by 100 feet. Site plan Dissipation Basin;three in the Plan -Two elevations were added to depict the top of the View Dissipation Basin;and two in the riprap basin. Section A-A:Profile. With the exception of the left-most elevation in Section A-A,all the Plan View: elevations appear to be about 100 feet too -All three elevations were decrease by 100 feet. high. The left-most elevation in Section A-A -Apron Elev.changed to match Section A-A Profile. appears to be about 20 feet too high. Please -Basin Floor Elevation unchanged. provide a corrected drawing. -Channel Invert:adjusted to 6,641.78(matched survey point). PAGE 1 OF 2