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po99ib111ty cannot bB ruled out because they are in hydraulic o®++..; cation pith each other. if <br />• the persistent degradational c}wxle is measured at H(i1AL3 which exceeds historically donmtented <br />ranges for SOd, TDS, and C1 at HGDALI and HGDW.2, HGT will negotiate with CDMG ae to xhathaz Dry <br />Creak stream water quality manitnrinq immediately above Walkaz Ditch should be implemented to <br />confirm whether the alluvial aquifaz incseaees at the loadout pose ary spatially significant <br />stream water quality and use potential prablams immediately above the flood irrigated fields fed <br />by Walker Ditch. <br />The stream water quality adjaoant to and immediately belox the loadout is suitable for livestock <br />use. Water q++•l ity trend analyses pzeviously des¢ibed will be utilized to determine if <br />pazsistent concentration changes are occurring that might exceed the liwatOCk use s A-~+=. <br />Persistent degradation alunyes to Dry Creek at Site HGSD3 rill be considered significant if <br />llwatmf`~C 9tanAaMa aze BXCe0dBd, thus precluding the potential rater use. These impact trend <br />analyses rill ba performed annually and submitted as part of the annual hydrologic data reports. <br />The trend analyses r~+•; ra a m,n~,+•+,+++ of four data points, so the first such analyses rill not be <br />performed until 1995. <br />Surfeaa Water Monitoring. Sur£aoe water monitoring at Sites HGSD1 and HGSD3 rill be conducted <br />semiannually (high snowmalt flax period between April and Juno end lox flax period between <br />Sept®ber and November) until at least four analyses haw bean run £or Site HGSD3. At that time, <br />only Site HGSD3 rill continue to be monitored and it rill be monitored semiannually. Pazameters <br />to ba measured semiannually include inatantanaous discharge, field rater quality parameters (pH, <br />tempazeture, and conductivity) aid the parameter suite presented in Table 13-1. Sample ~analyaes <br />rill be performed by a contract laboratory certified by the State of Colorado. <br />Ground Water Monitoring. Gmund water monitoring at Walls HC~AL1 and 8mAL3 rill be conducted <br />semiannually during the high and lox £lox periods, as specified for surfnco rater, until at least <br />four analyses haw been run for Site HGDAL3. At that time, only Site Hm11I3 rill continua to be <br />monitored and it rill ba monitored semiannually for water levels, field rater quality parameters <br />(pH, tea@arature, and oorductivity) and the parameter suite presented in Table 13-2, Sample <br />analyses rill be performed by a contract laboratory wrtified by the State oP Colorado. <br />NPDES Monitoring. The NPDES permit for the HGT Inadout Facility (COCr85000H), originally issued <br />to HG ran renewed in 1992 xith an effective date of July 1, 1992. HGT officially transferred the <br />NPDES permit £rom HG on November 6, 1992. HGT renewed the NPDES permit in 1997 xith an affective <br />data of July 1, 1997 and a Dopy of the NPDES permit for the HGT Ivadout <br />7 <br />IC/V ~ D <br />Revised 2/98 <br />