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Albert Frei & Sons, Inc. Page 2 <br />August 10, 2015 <br />way to cross reference them to the elevations they are working <br />with. We feel that all of the plats and exhibits that show <br />elevations should have the baseline called out to they can be <br />compared to the elevations we have for the relief drain as <br />built. For your information, our elevations are based on 5 <br />Adams County survey monuments in the vicinity and are NAVD 88 <br />elevations. We think it is important to have a way to correlate <br />the elevations being proposed in the amendment to our approved <br />elevations so we all know they will not cause a problem that we <br />will have to fix later. <br />In conclusion, we believe the french drain should match the <br />Divisions historic elevations. <br />If you have more questions or need more information please call <br />me at (303)289-1837. <br />Sincerely, <br />Ben Frei <br />cc Environment, Inc. <br />Tyler O'Donnell - via e-mail <br />file <br />