HomeMy WebLinkAbout821355062 Stormwater MgmtTfrnberiuld
A&MJ&g mor 't;, Inc.
FORESTRY CONSULTANTS
Since 1970
Stormwater Management Plan
For
Olympic Ridge Estates
Compiled by Earl Kong
June 15, 2001
290 5th Street
P.O. BOX 130
UNION, WA 98592
1-800-775-0795
wtm @ hctc.com
www. wtmtrees.com
Project Description - The purpose of this Stormwater Management Plan is to ensure that
the operation under FPA 2603994 unit #3, meets the standards set by Jefferson County
Planning department for erosion control. The FPA was approved on June 11, 2001 by the
Department of Natural Resources and provides for a 40 percent thinning operation over 15
acres.
The unit contains about 2,700 trees and the thinning operation will remove about 1,000
trees. The cutting of trees in itself does not cause erosion, however the roads and skid
roads used for logging, create exposed soil. Therefore increasing the potential for erosion.
Surface erosion is the only topic covered in this plan, as the conditions that could create a
mass wasting event at the site do not exist.
Soils - There are 2 soil series occupying the site, the Indianola series and the Cassolary
series. Within the Cassolary series are small inclusions of the Everett series. For
consideration of Stormwater Management, all these soils are similar. The Cassolary and
the Everett are a gravelly sandy loam and the Indianola soil is a loamy sand. All 3 soils
have a rooting depth of about 60 inches. They are excessively drained with rapid
permeability. Water erosion is slight when the slopes are nearly flat. Moderate when
slopes are about 30%. Severe when slopes exceed 50%.
Topography - The project area is occupied by an upland terrace with a slight gully about
1,000 feet long and 300 feet wide. The slopes along the sidewalls of the gully range from
15% to 50%. The area covered by slopes approaching 50% is less than 1%o of the project
site. There is no water (flowing or non flowing) or wetlands within or near the project site.
Recommendations- In conjunction with Jefferson County's "Large Parcel Erosion
Control Plan", the following recommendations are intended to manage Stormwater so that
the movement of soil is minimized or prevented.
.
Stabilization and sediment trapping. Exposed soil should be avoided on slopes
greater than 35%. All exposed soil will be stabilized by the application of
appropriate BMPs within two days, from October 1 through April 30 and within
seven days from May 1 through September 30, after the completion of the
project. The appropriate BMPs will include but not be limited to water bars, silt
REST
PRACTICE
·
Packet Created: 06/12/20ol
ACT IV ITY MAP
TOWNSH I P 28 NORTH, RANGE Ol EAST (W.M. ~, S_ECT ION 35
APPL I CAT ION if 2603gg
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MAP DAT~ J~e ~ 200~
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CONTOUR INTERVAL'
NAD 2 7
40 Feet LEGEND' See Instructions
DISCLAIMER' See Legend
CERTIFIED PROFESSIONAL GEOLOGIST
AIPG: 2671
CRAIG K. WHITE, INC.
GEOSCIENCES CONSULTING
CERTIFIED: AAPG
DIVISION OF ENVIRONMENTAl.
GEOSCIENCES
July 23,2001
Olympic Ridge Estates Commtmity Association
713 Olympic Ridge Dr.
Port Ludlow, WA 98365
Attention: Mr. John Mitchell
Department of Community Development
621 Sheridan Street
Port Townsend, WA 98368
Attention: Mr. John D. Peters
Washington Timberland Management
P.O. Box 130
Union, WA 98592
Attention: Mr. Gary Hanson, Mr. Earl Kong
t
JEFFERSON COUNTY
DEPT. OF OOM&,IUNITY DEVELOPMENT
Subject: Review of Stormwater Management Plan
Olympic Ridge Estates
FPA # 2603994 (Unit 3)
Gentlemen:
At the request of Mr. John Mitchell (Olympic Ridge Estates Community Association), we
performed a brief site evaluation of the proposed harvest areas for the above-captioned
FPA on July 20, 2001. At that time we also reviewed the conditions of the DNR permit, a
detailed map of the harvest areas (provided by .Mr. Mitchell), and the requirements of
Section 6 of Jefferson County's Unified Development Code (DOE SMM) as it pertains to
Stormwater Management.
It is our opinion that the Stormwater Management Plan for Olympic Ridge Estates,
compiled by Mr. Earl Kong on June 15, 2001 accurately characterizes the soil conditions
and topography at the harvest site, and clearly outlines the provisions of the proposed
thinning operation. The plan also includes recommendations that would establish adequate
buffers, and outlines appropriate steps which, if employed, would provide protection
against water runoff and erosion of the affected area.
P.O. BOX 3398. SILVERDALE. WA 98383 (360) 8304)718
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