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December 17, 1999

Our Ref.: 993-2095

McGowan Working Partners
1837 Crane Ridge Drive
P.O. Box 55809
Jackson, Mississippi  39296-5809

Attention: Mssrs. John McGowan and Mart Lamar

RE:    GOLDEN HYDRAULICS EVALUATION OF PROPOSED PEARL RIVER  FLOOD CONTROL LAKE AND DEVELOPMENT PLAN FOR MCGOWAN WORKING PARTNERS (JACKSON, MISSISSIPPI)

Dear Mssrs. John McGowan and Mart Lamar:

On November 23, 1999, McGowan Working Partners (McGowan) in Jackson, Mississippi requested that Golder Associates inc. (Golder) in Lakewood, Colorado complete a reasonableness check and verification/qualification evaluation of the HEC-2 analyses already completed and reported on by McGowan in the "Flood Control and Development Plan for the Jackson Metropolitan Area (revised November 15, 1999)."  McGowan specifically requested that Golder make an evaluation of the McGowan predicted maximum flood water leverls during a peak 128,000-cubic feet per second (cfs) flood event with the proposed flood control lake system in place as it appears on the McGowan DTLAKE.DAT "working HEC-2 model" run.  McGowan directed Golder to use a starting water surface elevation (WSE) of 272.9 feet (current National Geodetic Vertical Datum (NGVD) mean sea level datum) at River Mile 284.5 (RM 284.5).  (All elevations referenced herein are to current NGVD datum).   This elevation corresponds to the maximum water surface elevation reported for the 1979 maximum flood of record at this location as well as to the U.S. Army Corps of Engineers (COE) calculated 100-year maximum water surface elevation at RM 284.5 as previously determined by the COE for its proposed levee project being in place.   (Reference is made to the U.S. Amy Engineer District, Vicksburg Corps of Engineers (Vicksburg, Mississippi) "Pearl River Basin Jackson Metropolitain Area, Mississippi Feasibility Report", (date not reported.))

Golder previously completed work for McGowan in response to an e-mail message to Golder in November 2, 1999 in which McGowan requested that a hydraulics evaluation be made for two prposed broad-crested weir sites located at the proposed flood control lake on the Pearl River through the City of Jackson, Mississippi.  Specifically, four situations were presented by McGowan for Golder to calculate flood water levels above the two weir sites (designated as Lover Lake Weir and Upper Lake Weir) based on the hydraulics information and sata McGown provided on Sheets 1 through 4 included with the e-mail

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