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EXHIBIT B <br /> Scope of Work Modification <br /> CRDSS Yampa Daily Model <br /> Background and Purpose <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 /> Description of tasks <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 /> • 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 /> • Boyle will similarly check Statemod's automated disaggregation of monthly baseflow, demands, and <br /> reservoir targets in the first daily model (monthly processes distributed uniformly 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 /> • 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 /> • 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 /> • 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 of time required: 3 hrs. <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 /> • 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 /> D:\Projects\CRDSS\Addendumlscope.doc <br />