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PIVI$Ion of 1W4WResources <br />RE: Greeley P# SWSP. <br />Page 2-af3 <br />In "regard to the claim for 8.8 acres, of pre-81 excavated area, you requested more substantial <br />:evidence that the 8.8 acres were filled with groundwater as of December 31, 1980. Joe Kuntz of , <br />Mountain: Constructors (who operated the-gravel pit during the 1980 to 1981 period) was willing : <br />;to sign the attached affidavit stating that the 8.8 acres of excavated area was indeed filled with <br />-groundwater as of December 31, 1980. Given this affidavit, we maintain that these 8.8.acres can <br />be included:as pre-81" credit and used to offset the current exposed area. Therefore, the-total <br />credit being sought".includes the. 31.A acres of pre-81 exposed area and the 8.8 acres of pre-81 <br />dxeavated area, for a. total "of 40.2 acres. Given that the current.exposed area is 67.6 acres, the <br />net exposed area that requires:augme ion is, equal to 27.4 acres; physically, this exposed area .- <br />rep ents the small 0.7 acre pond. and a iiortion of the "large 40. acre pond. - <br />In : regard . to :the basis for assuming instantaneous depletions from "the Greeley Pit, we " . . <br />:. ;acknowledge that not ail of the ponds" are located within 200 feet of the Cache la Poudre River." <br />Of the four separate ponds that currently exist within the Greeley Pit, only two (the large 40 acre " <br />pond and 1116'W" 0.7 acre pond)` are not completely covered by.pre-81 "credit.- Becautse . <br />` : evaporation "from the"large 40 acre pond makes up the "majority of the depletions, the lagging <br />parameters for the"Greeley - Pit depletions were based on that pond's location and are as follows: <br />0., .Distance finm".pond to stream M ° 650 feet. This distance represents the distance,from <br />the down-gradient extent of the exposed area to the Cache la Poudre River. <br />Aquifer Transmissivity M_ 120,000 gallons per day per foot. This value corresponds to <br />" the transrnissivrty at the nearest pump test well in the area. (1.oc."No.- $6-6(J-34-bab2)" as <br />:reported in the Colorado Groundwater Circular No. i 1. <br />: '• "Specific Yield (S) = 02: This value is typical for alluvial aquifers. <br />The aquifer width.(W) Was assumed to be infinite because a parallel no-flow boundary <br />could not 'be idntified' based on "information -gym the united States Geologic Survey <br />:. " Hydrologic Atlas 14A-746A: <br />Based on the above Parameters and the pattern of depletions provided in the original SWSP. - <br />'; request, we determined. that, "at steady-state conditions, the total annual lagged depletions would . <br />be: distributed throughout tl?e"year according to.the following monthly percentages; <br /> Apr - .: MAY - :Jun Jul Aug SOP Oct Nov Dec lan Feb Mar Total <br /> 7% .. 10a% o - 13% 15% IS% . • I2% . 696 3% 2°/i _ "3%0 5% <br />I00'ib