BOARD01343

• Board Meeting Date: 7/23/2001
• Description: Flood Section - Review Proposed Easement Guidelines
• Board Meetings - Doc Type: Memo

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ADDENDUM

ANTICIPATED CHANGES TO DRAFT SPDSS FEASIBILITY STUDY

I. Chapter 3 and Chapter 5 will be edited to ensure consistency in naming conventions
of the groundwater regions (i,e. Denver Basin and Overlying Alluvium Region,
Lower South Platte Alluvium Region, etc.). Chapter 3 will be further reviewed to
insure consistency between the tasks proposed for data collection in Chapter 3 and
the budgets in Chapter 5,

2, Chapter 3 will be edited to indicate that the consumptive use contractor will use
appropriate data from Denver Water's Highline Canal study in discussion of data
collection for consumptive use by phreatophytes.

3, Chapter 5 will be edited to add further justification for placing flow routing in
Alternative 3.

4. Chapter 5 will be edited by moving the current Division I program to locate
groundwater wells with GPS from Alternative 3 to Alternative 2. This will increase
the cost of Alternative 2 by $374,000 and decrease the cost of Alternative 3 by
$374,000.

5. Chapter 3 will be edited to include an explanation of why the mountainous
groundwater regions were not included in the groundwater assessment. Explanation
will include description of current USGS program to characterize mountainous
groundwater regions and how this information will be utilized by the SPDSS.

6, Section 4.4.3.1, p, 4-11, bullets 2 and 3 will be combined and modified to read as
follows:

. Increasing the vertical discretization of the SB 96-74 model to improve the
representation of the major low-permeability clay and shale layers located
between the major aquifers and improving the representation and understanding
of the alluvial aquifers (including the Designated Groundwater Basins) overlying
the Denver Basin by adding up to five layers to the SB 96-74

7, Modifying the first dash (-) under the first bullet in Section 5.4.2.3, p, 5-27 to read as
follows:

. Add up to five model layers to the SB 96-74 MODFLOW model, for a total of 11
layers, to allow aquifers and lower-permeability strata to be simulated
independently

8. A technical review will be completed to insure consistency between the Executive
Summary and the five chapters of the report.

C:\windows\TEMPIADDENDUM.doc
July 13,2001

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