HomeMy WebLinkAbout2002.04.00 - C. Robinson Short Plat Lot 1 Floodplain ReportRe: Floodplain Property on Hastings
Parcel #001044018 Lot 1 C. Robinson Short Plat
Chuck Robinson
240 Robinson Road
Brinnon, WA 98320
April 2002..
Dear Jean,
The purpose of this letter is to address the Environmentally Sensitive Area (ESA) mapped
as a floodplain that bisects Chuck Robinson's property on Hastings Avenue_
Fieldwork was conducted on April 8, 2002 to assess site conditions, elevations, and wetland
conditions. This hilly site consists of a healthy overstory of Douglas' firs and red cedars
with an understory of sword ferns, salal, Oregon grape, and rhododendrons. No standing
water or wetland vegetation was observed. A low -lying swale lies off site approximately 50
feet west ofthe southwest property corner at Hastings and 10 feet west of the northwest
property comer (see enclosed map). This swale is 50 to 60 feet wide and would be the path
of upslope floodwaters. The subject property is distinctly higher than the low -lying area;
slopes range from 8% to 15 %.
Located near the top of Basin 4, the floodplain would not be subject to high volumes of
uphill stormwater runoff. Even though the property is near the top of the basin it is
important that development projects do not contribute additional storm water problems to
downslope properties. Recommendations include enforcing the 25 -foot buffer from the
edge of the floodplain, which crosses the comer of Chuck Robinson's property. All
vegetation should remain intact along the western property line.
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The 100 -year floodplain was mostly mapped using topography lines most likely taken from
aerial photographs rather than from ground surveys. In wooded areas errors can and often
do occur. Field findings show the floodplain channel does not fall on the property and no
signs of flooding or standing water were present anywhere on the site.
In summary, no standing water or other signs ofrecent flooding were observed. The
subject properly, which is near the top of the Basin 4, is upslope from the wide drainage
area and outside an ESA. The northwest corner, however, falls within the 25 -foot
protective buffer associated with this floodplain. Therefore, building and vegetation
removal should be restricted along this boundary to minimize impacts downslope.
If further work is required or you have any question about this project please feel free to
call.
Sincerely,
Dixie Llewellin
Principal Biologist, Olympic Wetland Resources, Inc.
Certified for Wetland Delineation, 1987 Manual
Wetland Training Institute, June 1995
360) 385 -6432
Cc; Chuck Robinson, Jill Buhler Windermere Real Estate
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Floodplain as Mapped by Polaris (Map dated 6/29/95)
Field Findings (Drainage swale /floodplain) April 8, 2002
Floodplain Map kale: Sheet
Olympicpic We land Resources, Inc. huck Robinson
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Parcel # 001044018
a 856 50% Shed Lot 1 C. Robinson Short Plat April 2002
1ParaTownsend, WA 98368 C66 Chuck Robinson
360 385 -6431 240 Robinson Road ab f
Brinnon, WA 98320 2002 -0114
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r - -421 I p ..,1 ! i M
Floodplain as Mapped by Polaris (Map dated 6/29/95)
Field Findings (Drainage swale /floodplain) April 8, 2002