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© 1992 THE PUBLIC RECORD CORPORATION <br />ALL RIGHTS RESERVED 15 CR 39 3-92 PWP 3 <br />(3) "Casing" means the pipe installed in the borehole or excavation to provide unobstructed <br />access to the water bearing formation. The term includes both nonperforated and perforated <br />pipe and screen. <br />(4) "Control Regulation" means any regulation promulgated by the Water Quality Control <br />Commission pursuant to C.R.S. 25-8-205. <br />(5) "Divert" or "Diversion" means removing water from its natural course or location, or <br />controlling water in its natural course or location, by means of a ditch, canal, flume, reservoir, <br />bypass, pipeline, conduit, well, pump, or other structure or device. <br />(6) "Implementing Agency" refers to any of the state agencies mentioned as such in C.R.S. <br />25-8-202(7). <br />(7) "Mass Balance Analysis" refers to a fundamental engineering approach used to quantify <br />the chemical changes that take place in some definable water body. The mass balance equation <br />is: <br />M2 = (M303 - M 101)/Q2 <br />Where: <br />01 = Upstream low flow <br />02 = Average flow of the source as it enters the waterway <br />03 = 01 + 02 = Downstream flow <br />M1 = Upstream pollutant concentration <br />M2 = Known or unknown pollutant concentration <br />M3 = Known pollutant concentration, calculated resulting pollutant concentration, <br />or Water Quality Standard of pollutant <br />03 may be measured at the location of the use to which the senior appropriation has <br />normally been put, or at or near the point where the substituted supply enters the waterway. If <br />03 is measured at the point of use of the senior appropriator, additional known quantities, with <br />known concentrations of constituents, must be used if necessary to account for accretions and <br />depletions the point where the substitute supply is introduced and the location of use <br />of the senior appropriation. This data must be provided by the applicant for the exchange, plan <br />for augmentation, or substitute supply plan, if the applicant chooses to use the mass balance <br />equation to show that the quality of water meets the requirements of use to the senior <br />appropriator. <br />(8) "Mixing Zone" is that portion of a water body designated on a case -by -case basis by the <br />State Engineer which is contiguous to a discharge of an activity regulated by the State Engineer <br />and in which the water quality standards may not apply. The mixing zone is intended to serve <br />as a zone of dilution between the place of introduction of a substitute supply and the point of <br />diversion of the senior appropriator or, in the case of an existing water quality standard, in the <br />TM <br />THE CODE OF COLORADO REGULATIONS 2 CCR 402-8 <br />