SWA000148_Stormwater Report_20220607

STORMWATER REPORT
FOR
MYRTLE MANOR
ANGIER, NC
May 2022
Prepared By
Bass, Nixon & Kennedy, Inc.
Consulting Engineers
6310 Chapel Hill Rd., Suite 250
Raleigh, NC 27587
[phone]
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14023 —
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Table of Contents
I. Introduction
11. Pre -Development Site Conditions
III. Post -Development Site Conditions
IV. Stormwater Management
V. Off -Site Areas
VI. Phasing
VII Site Map

MYRTLE MANOR SUBDIVSION
ANGIER, NC
I. INTRODUCTION
The purpose of this report is to provide an executive summary of the stormwater
management and the storm drainage design for the Myrtle Manor Subdivision Project.
H. PRE -DEVELOPMENT SITE CONDITIONS
The site is located at Town of Angier, NC. It is north and adjacent to Gardner Road, South of
the dead-end of Roy Adams Road, east of Matthews Mill Pond Road and west of Old Buies
Creek Road. Site consists of pasture and wooded areas.
III. POST -DEVELOPMENT SITE CONDITIONS
The proposed site plan includes a combination of 70 single family homes and 56 townhomes,
street network and parking lot for mailboxes (CBU)
The proposed subdivision will have a homeowner's association that will be responsible for
the proposed open space. The open space consists of a grassed play field, trails, one existing
pond, woody wetlands and 2 wet ponds.
IV. STORMWATER MANAGEMENT
Stormwater quantity and quality issues will be addressed with the implementation of two wet
ponds located to the north and to the south of the existing pond. The stormwater management
facilities will be designed to attenuate the flows from the 10 and the 100 year storms in
accordance with the Town of Angier Standards and Specifications. The Wet Pond will treat
up to 30% of the Nitrogen from the runoff directed to the ponds.
V. OFF -SITE AREAS
Currently about 5 +/- acres of land is expected to drain onto the northern part of the site from
the Dupree sod farm (PIN 0673-55-1625.000) which is located north and adjacent to Myrtle
Manor. As of May 17�' this fann was submitted to the Town of Angier for a single family
rezoning. If this parcel of land is developed there will be a chance that some of the runoff
from the Dupree site will drain back to Myrtle Manor and if so we have the necessary storm
piping system to collect this runoff and redirect to our stormwater SCM devices for
attenuation and treatment.

VI. PHASING
Myrtle Manor will have 2 phases. Phasing is required because the Town of Angier will only
allow 99 units on one physical access. Once the Dupree Farm is developed they will be required
to extend Roy Adams Road to the south and connect up with the portion of Roy Adams
Extension we are building with Myrtle Manor. Phase One will consist of 70 single family lots
and 29 townhomes for a total of 99 units. Phase Two will consist of 27 townhomes which will be
the balance of units for the project. As for construction all infrastructure including grading,
storm., water, sewer, roads and the 2 SCM's will be installed initially with Phase One. The pads
for the 29 townhomes will be graded and left stabilized waiting until the second access is built
and connected to Roy Adams Road.

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