SW3120102_Geotechnical Report_20100120

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Stormwater Narrative
AutoZone
Idlewild Road
Union County, NC
Tax Parcel ID: 07060094, 07060095 & 07060096
Just south of intersection with Hillcrest Circle
Site Information:
Total Site Area = 3.23ac net (after right-of-way dedication)
Disturbed Area = 1.3ac
Wetland
Area = 0 (no impact)
Developer = AutoZone, Inc.
Wade Davis (James Griffith — Vice President)
123 South Front Street, 3`d Floor
Memphis, NC 38103
901-495-8701
Owner = Theodore & Demetra Karres
442 Blairmore Drive
Charlotte, NC 28211
Engineer = Triangle Site Design, PLLC
Matt Lowder, PE
4006 Barrett Drive, Suite 203
Raleigh, NC 27609
919-553-6570
Development Plan: The proposed development will consists of an AutoZone retail store. A
stormwater bio-retention pond will be constructed to treat stormwater
runoff from the AutoZone for water quality & water quantity control.
The existing site condition for the site is primarily wooded with a few
open patches of grassland
Phasing: All of the site construction will be developed in one phase of
construction.
Utility Systems: Domestic water supply will be provided via a new service line from the
Union County water system. Sanitary sewer will be provided via a new
service line from the Utilities, Inc. community sanitary sewer system.
Historic/Public Money: The property does not contain any historic sites and is not being funded
with public monies.
NCDENR: There are not any non-compliance issues with DENR Agencies.

Stormwater Information:
River Basin: Yadkin
Stream Classification: C
Stream: Drains to North Fork Crooked Creek
Stormwater Design: State Stormwater (Nan-Coastai County)
Density Option: High Density
Development Type: Commercial
Impervious Area:
Total Site Area:
Impervious Area:
Open Area:
140,906sf (3.23ac net)
30,042sf (21.3% of site)
110,864sf (78.7% of site)
Proposed Treatment Measures: Bio-Retention (Designed for 85% TSS)
Will all built -upon areas be collected: The proposed building and parking lot will drain to the
BMP bio-retention pond.
Buffer Requirements: Municipality required landscape buffers required at property perimeter,
no development within buffers. No stream buffers required within the
Crooked Creek watershed.
On-site/off-site runoff: no -off site drainage into the proposed bio-retention system.
Road Construction Requirements: The NCDOT is not requiring turn lanes in association
with this project. The propose site will gain access
through a new driveway on Idlewild Road
Soils Evaluation:
Infiltration Rate: .16in/hr
SHWT: 31ft± Below Surface
Site Evalutation Date: 11/30/11