17-105489-Impervious Areas Map-05-21-20-V15lXN
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BUILDING "1"
I 605,195 SF
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I 442.38-448.45
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30' SETBACK
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BUILDING 112"
240,675 SF
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420.28-424.53
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SCALE: 1 " = 100'
100 50 0 100 2.00
BUILDING AREA CALCULATIONS
BUILDING 1
605,195 SF (13.9 AC)
BUILDING 2
240,675 SF (5.5 AC)
BUILDING 3
125,520 SF (2.9)
TOTAL NEW BUILDINGS = 971,390 SF (22.3 AC)
IMPERVIOUS AREA CALCULATIONS
NO.
DESCRIPTION,/DATE
TOTAL PROJECT IMPERVIOUS
62.5
AC
EXISTING IMPERVIOUS TO REMAIN
7.8
AC
TOTAL NEW AND REPLACED IMPERVIOUS
54.7
AC
REPLACED IMPERVIOUS
<10.8
AC>
TOTAL NEW IMPERVIOUS
43.9
AC
NOTES:
1. POND ACCESS ROADS CONSERVATIVELY ESTIMATED AT 1.0 AC. ACTUAL AREA MAY
VARY IN FINAL DESIGN BUT WILL NOT EXCEED 1.0 AC.
2. SECTION 1.1.2.5 OF THE 2016 KING COUNTY SURFACE WATER DESIGN MANUAL,
AS ADOPTED BY FEDERAL WAY, STATES THE FOLLOWING:
LARGE PROJECT DRAINAGE REVIEW IS REQUIRED FOR ANY PROPOSED PROJECT
THAT IS SUBJECT TO DRAINAGE REVIEW AS DETERMINED IN SECTION 1.1.1 (P.
1-12), AND THAT MEETS ANY ONE OF THE FOLLOWING CRITERIA:
•THE PROJECT IS DESIGNATED FOR AN URBAN PLANNED DEVELOPMENT (UPD)
ON THE KING COUNTY COMPREHENSIVE PLAN LAND USE MAP, OR
•THE PROJECT WOULD, AT FULL BUILDOUT, RESULT IN 50 ACRES OR MORE OF
NEW IMPERVIOUS SURFACE WITHIN A SINGLE SUBBASIN OR MULTIPLE
SUBBASINS THAT ARE HYDRAULICALLY CONNECTED ACROSS SUBBASIN
BOUNDARIES,
THE PROJECT, AT FULL BUILDOUT RESULTS LESS THAN 50 ACRES OF NEW
IMPERVIOUS SURFACE; THEREFORE, IT IS NOT SUBJECT TO LARGE PROJECT
DRAINAGE REVIEW AND DOES NOT REQUIRE THE PREPARATION OF A MASTER
DRAINAGE PLAN.
LEGEND
NEW IMPERVIOUS
EXISTING IMPERVIOUS TO
REMAIN
REPLACED IMPERVIOUS
1
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FREVISICDNS
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JOB NO.
1886-001-016
DWG. NAME
EN -20
DE=SIGNED BY:
LGB
DRAWN BY:
JJH
CHECKED BY:
DATE:
05/21/2020
PRINT DATE:
EN
-20
1 OF I SHEETS