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<br />-- ' ~ 111111f1119~~w~+a <br />Er~vir~r~n~er~~., Ir~c. <br />LARRY E. O'BRIAN 7965 VANCE DRIVE, SUITE 205A <br />VRESIDENT ARVADA, COLORADO 80009 <br />303-423-7297 <br />January 5, 1994 <br />17r. Mark A. McLean, P.C. <br />Rocky Mountain Consultants, Inc. <br />700 Florida Ave, 5tlr Floor <br />Longmont, CO 80501 <br />Dear Mark: <br />RE: Substitute Water Supply Plan for <br />.,Flag Resources - Silt Pit MLRB # M81202) <br />Enclosed is the additional information you requested in your <br />last review letter. After reviewing you comments and TR-21 I see <br />where you were correct concerning the Midpoint temperatures and <br />took youR suggestion to use Table 6 to find the effective precipi- <br />tation amounts. I have also attached a revised TABLE AND EXt1IBIT <br />DATA sheet showing the constants I used to create the tables. I <br />will address the questions posed in the order you presented them in <br />your letter. <br />• I revised Table C1 subtracting the wetland areas and <br />losses from the gross lake evaporation as you suggested. <br />feel we have done this. Tlris number is then carried into <br />Table Al that recaps the total system losses and credits. <br />An alternate method would to be to subtract the disturbed <br />wetland area from ttre gross lake area created by mining <br />and then calculating the evaporative loss from ttre net <br />lake area. I have used this method on the accounting <br />form to avoid confusing the operator when they fill out <br />the sheet each month. I have revised the accounting Eorm <br />as you suggested. <br />• I (rave revised Exhibits A1, B1 and C1 and TABLE Al <br />submitted previously. After reviewirrq TR-21 I found that <br />I had used the mean monthly temperatures for ttre first <br />day of the month instead of the 15th. So I corrected the <br />midpoint temperatures as you suggested and recalculated <br />the values in the Blaney-Griddle table. I found this had <br />c~Op~f <br />