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Explanation of Additional Information for Cattail Duplexes, Application 20285
The numbers below correspond to the numbers on your letter dated September 18, 2021
requesting additional information regarding the engineering comments.
Easements
1. BMC 38.410.060: Easements
a. Mutual accesses easements for lot aggregation. Dixon to talk to general council.
b. The 10’ utility easement is shown on revised sheet XX. Keith
Stormwater
1. BMC 38.410.080 and 40.04.500.A: Requirements to control and reduce stormwater
pollutants
a. The stormwater design report is attached.
b. The groundwater elevation as the site is estimated at six feet below the surface per
Gallatin County GIS Hackett and Slage Contours. The revised retention area is
one foot in depth.
Transportation
1. BMC 38.400.090.D.2 Access
a. Public access location was approved and recorded on Amended Plat of Lot 4,
Block 12 Cattail Creek Subdivision Phases 2A and 2B in 2007.
Water Rights
1. BMC 38.410.130 – Water Rights
a. Griffin Nielsen was contacted on October 13, 2021 and stated that the existing
credit for Blk12, Lots 4A and 4B is sufficient to cover the project annual demand.
No LILWR payment is required. Email correspondence from Nielson is attached.
Water and Sewer
1. BMC 38.410.070 – Municipal water, sanitary sewer and storm sewer system
a. Water and sewer main extensions are provided onsite.
2. DSSP V.A.4 – Water Main Size
a. The water main size has been revised to 8’’ DIP on the attached plan set.
3. DSSP V.B.10 – Sewer Main Size
a. The sewer main size has been revised to 8’’ PVC on the revised plan set.
4. BMC 38.410.070 and DSSP V.A and V.B
a. An estimate of the peak-hour sanitary sewer demand as well as the average and
max day demands of domestic water usage for the proposed site development
certified by a professional engineer are attached.
Attachments: (1) Revised Plan Set
(1) Stormwater Report
(1) Amended Plat of Lot 4, Block 12 Cattail Creek Subdivision Phases 2A and 2B
(1) Email correspondence with COB
(1) Certified Sewer Demands
(1) Certified Water Demands