01348EXPLANATIONS
II ENVIRONMENTAL IMPACT
(1) Earth
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The Soil Conservation Service 1947 Soil Surve designates the sites soil as
Everett gravelly sandy loam, hilly phase (Evb�. This soil typically exhibits a
severe limitat'.�n�Q shallow excavations due to its.gravelly nature. The soil texture
permits ready ougnin of sidewalls, allowing potential for erosion of unstable soil
created by site deve opment.
a. As per the above, short-term unstable soil conditions will exist due to
initial development activities requiring rockeries in some areas.
b,c. Through -development of surface soils for foundation excavations, building
construction, surface drainage channels, and -road construction, it is expected
that soils will be.moved as is necessary for approved site design. Some
compaction. of soils.is expected to result from ground surface clearance by on -site
machinery.
c.- Before lawns and other landscaping measures are extablished, there will be
an increase in erosion of disturbed areas, but this will be of a temporary .
nature. Mitigation wi11 actuate with the.installation of temporary (during
construction) siltation removal devices (hay berms) and conventional permanent
pollutant control -devices.
y
(2) Air
a. Diminished air quality, due to initial construction equipment and resultant resident
traffic, will have a minimal effect on area a-ir quality. Existing air quality is quite
high due to the lack of traffic and heavy industry in the area.
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b. During construction, 4".ctionaT=;odors may arise; associated with street
paving and/or roof surfacing activities.
(3) Water
b. Water runoff (due to surface clearance and road installation) is expected
to increase approximately 30%. An internal drainage system will help to
dissipate the runoff and mitigate the effects; while providing
retention/detention and release off -site at a rate determined equitable to the peak volume
released under predevelopment conditions.
e. Surface water will be directed to the on -site retention system and released into a
natural channel which runs westerly along the sites' northern boundary. This channel
releases into a natural wet area (swamp) situated in the southern end of Pine Ridge Park,
about 85'. northeast of the site.
SURVEYING ENGINEERING PLANNING
MANAGEMENT
IN