HomeMy WebLinkAboutBEST BUY EXPANSION MAJOR AMENDMENT AND REPLAT - 29 92B - CORRESPONDENCE - STORMWATER-RELATED DOCUMENTSMEMORANDUM
TO: Basil Hamden DATE:
FROM: Herman Feissner, E.I.T. PROJ #:
SUBJECT: Best Buy P.U.D. Project Comments
Pjoau I
B E Y O N D E N G I N E E R I N G
March 21, 2000 '
FC0114
1. The rational method calculations were re -calculated using "new" rainfall criteria. The
existing basins, that lie upstream of the Site, were left "as is". The "new" rainfall criteria
was only applied to the specific area that is being disturbed with the proposed expansion.
The "new" rainfall criteria was also applied to the FAA Method calculations.
2. Existing contours were added in those areas outlined on the grading plan. Also, the
existing contours were darkened to improve their readability.
I The detail for the curb -cut associated with basin 200 was added to Sheet C5. The detail
shows the cut with, flowline elevations, curb height at the cut and the curb transition back
to a fall 6" thickness.
4. The general, notes on Sheet C1 were modified as as specified..
5. Reduced copies of the Wetland Mitigation Plan and Landscape Plan are included in
Appendix B of the drainage report.
6. The drainage summary table was added to Sheet C6.
7. An exhibit was added that shows the entire CI -exist. basin. The exhibit also shows where
the flows in Storm Drain System `A' originate and there relative magnitudes. This
system outfalls to basin 100 (Qout = 6.10 cfs).
8. Refer to the drainage report.
9. A trashrack was added to the Water Quality Structure detail as well as a reference as to
which sheet the trash rack specific detail is shown on.
10. The 100-yr. H.G.L. was added to each of the storm drain profiles as well as the related
100-yr. W.S.E.L.'s.
Riprap, water quality and trash rack details have been added.
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MEMORANDUM (cont)
Page 2
12. Calculations that substantiate the capacity of the outfall pipe to the southeast of the Site
have been added to the drainage report.
13. Erosion control calculations have been completed and added to the drainage report. In
addition, the construction sequence table has been added to Sheet C7.
14. An exhibit was added to the drainage report (Refer to Appendix X) that shows the entire
'C' basin. The original runoff calculations, which would have substantiated the 2-vr. and
100-yr. developed Q' values for basins C i and CZ are not available..
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