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I I . I. I I I I I I I I I I I I I I . 0\ Massey Draw and SJCD Update Project Meeting Minutes March 31, 2004 Page 2 of 2 OLSSON ASSOCIATES ENGINEERS. PLANNERS' SCIENTISTS. SURVEYORS 143 Union Blvd. Suite 700 Lakewood, CO 80228720-962-6072 5. The following comments about specific locations were made, The North Tributary of SJCD 6200 South channel upstream of the Centennial Reservoir property to S, Platte Canyon Road is being considered for acceptance into the UDFCD maintenance program. UDFCD prefers not to have detention basins that serve watersheds larger than one square mile because maintenance can become a problem. Denver Water Department owns the first 100 feet west of S, Platte Canyon Road, in which a major conduit is located. The County has the construction/grading plan for the Deer Creek Golf Course. Paula Lundquist believes that a few houses might encroach the floodplain. 6. When preparing the Phase A cost estimates, it should be assumed that a significant amount of trails would need to be replaced, 7. Ben Urbonas noted that the three ponds on the golf course should potentially be considered in the models. He also noted that the assembly of the HEC-RAS models should begin as their delivery parallels the Phase A report. 8. Paula Lundquist will check on whether the stream segment going through the hogback is within public right-of-way. 9, A watershed tour the week of April 19'h and the difficulty of viewing some channel segments that flow through private property were discussed. A specific date and time will be confirmed after the meeting, (It was later confirmed that April 19, 2004 would be the date of the tour, starting at 10:00 am.) 10, OA will finalize and submit the hydrology report and begin assembling the HEC-RAS models. MEETING MINUTES Massey Draw and SJCD (South) Update OA Project No. 02-2003-1321 March 31, 2004 Attendees: Ben Urbonas - Urban Drainage and Flood Control District (UDFCD) Paula Lundquist - Jefferson County Alicia Cope - Jefferson County Bob Deeds - City of Littleton Justin Werdel- CDOT Hydraulics Bruce Buttner - Olsson Associates (OA) David Krickbaum - Olsson Associates Deb Ohlinger - Olsson Associates Discussion Items: 1. A table showing the comparisons between the Major Drainageway Planning (MDP) and the OA calibration model was distributed and discussed. The two compared favorably. A graph showing hydrograph comparisons of the effect of detention at the Sanctuary was distributed, It was noted that the detention at the Sanctuary did impact the 100-year discharge throughout SJCD (South), UDFCD had run the models with hyetographs generated using radar data from the August 4, 1999. Ben Urbonas noted that although the discharges using the radar data were comparable to the calibration model, they are higher than the observed discharges. 11. The next meeting will be at 9:00 am on April 27, 2004 at Olsson Associates' office. New findings from the watershed tour, the hydrology report, and alternatives will be discussed. 2, A matrix of preliminary alternatives, a map identifying locations of channel segments flowing greater than five feet deep, and a table showing the number of control structures required to attain 0.4% slope in the channels, along with estimated associated costs, were distributed, A discussion of preliminary findings and alternatives for the drainageways ensued. Locations for potential detention were discussed and included upstream of Garrison on Tributary #1, upstream of Kipling on Tributary #1, and upstream of Carr on North Tributary Massey Draw, Some of the locations were within the Foothills Parks Department properties. Property ownership of small ponds west of Kipling was discussed. cc: Attendees via e-mail Russ Clayshulte via e-mail Paul Winkle Kent Wiley Larry Lang via e-mail Gene Reetz John Liou Bill Kieck via e-mail Melissa Chew via e-mail Tim Carey via e-mail Larry Mugler via e-mail Rick McLoud via e-mail Scott Franklin via e-mail Sean Warren via e-mail 3. Bob Deeds expressed his interest in seeking opportunities for water quality improvements, He is particularly concerned with sediment and nutrients. 4. Ben Urbonas suggested that photographs of the incised stream banks and wetlands be included in the Phase B report. He also recommended adding explanatory notes to the matrix of alternatives.