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<br />. <br /> <br />. <br /> <br />EXHIBIT B <br /> <br />Scope of Work Modification <br />CRDSS Yampa Daily Model <br /> <br />Background and Purpose <br /> <br />Statemod code has been enhanced to accommodate daily time step simulation. The task described in <br />Exhibit A of the State's Daily Yampa Model contract with Boyle Engineering, dated December 20, <br />2000, represents the first major application of many of the daily features. The purpose of this addendum <br />is to provide additional peer review of modeling results. Furthermore, DMI's and databases have also <br />been updated recently. This addendum allows for Boyle to work with the State and RTi to encounter and <br />identify problems related to the new products and repeat model-building steps as required because of <br />product corrections or updates. <br /> <br />Description oftasks <br /> <br />The existing scope of work calls for three versions of a daily model to be developed on a relatively small <br />sub-basin of the Yampa River. <br /> <br />. Using daily node balance sheets (daily analog of the *'xdd, * .xre, and * .xir files) Boyle will verify <br />daily return flows for one example diverting structure in one of the three models, using spreadsheet <br />or hand calculations. Any problems will be communicated quickly and informally, but in writing, to <br />the State so they can proceed with corrections. Estimate of time required: 8 hrs. <br /> <br />. Boyle will similarly check Statemod's automated disaggregation of monthly base flow, demands, and <br />reservoir targets in the first daily model (monthly processes distributed unifonnly across days of the <br />month). Problems will be communicated in writing to the State, so they can proceed with <br />corrections. Estimate of time required: 4 hrs. <br /> <br />. Boyle will check Statemod's automated disaggregation of monthly baseflow according to the pattern <br />of the Clark gage, in the second daily model. Problems will be communicated in writing to the State, <br />so they can proceed with corrections. Estimate of time required: 4 hrs <br /> <br />. Boyle will check Statemod's daily baseflow computations in the third model. Problems will be <br />communicated in writing to the State, so they can proceed with corrections. Estimate of time <br />required: 4 hrs. <br /> <br />. For all three models, Boyle will review water balance spreadsheets and compare them with the water <br />balance from the original monthly model. Problems will be communicated in writing to the State, so <br />they can proceed with corrections. Estimate aftime required: 3 hrs. <br /> <br />. After the State has modified code in response to the first iteration of Boyle review, Boyle may be <br />asked to repeat the testing that originally revealed the bug, and report outcome to the State. Estimate <br />of time required: 9 hrs. <br /> <br />. Boyle will prepare a memorandum to the State documenting the review process. The memo should <br />indicate closure on all issues unless the State has (for reasons unforeseeable at this time) prioritized <br />and scheduled the work beyond the duration of this contract. Estimate of time required: 8 hrs. <br /> <br />D:IProjectslCRDSSlAddendum 1 sea pe.dae <br />