HomeMy WebLinkAboutMiscellaneous PLANNER 7/9/2005
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PUBLIC WORKS DEPARTMENT
ADMINISTRATION
ENGINEERING DIVISION
ENVIRONMENTAL SERVICES DIVISION
MAINTENANCE DIVISIO
TRANSPORTATION DIVI I
TECHNICAL SERVICES DIVISION
,a;5 FIFTH STREET
'UF1ELD, OR 97477
www.ci.springfield.orus/dept-f]w.htm
. . www.ci.springfield.ows
July 9, 2005
By: 1~ 4~o 5
I V-+3~~
SUBJECT: USING PERVIOUS PAVERS OR OTHER INFilTRATION SYSTEMS ON
THE MOUNTAINGATE SUBDIVISION
The following is the information required for City review of proposed pervious pavers on
the MountainGate Subdivision. There are important considerations that must be
reviewed and each review is site specific. The use of such pavers shall not create
unstable slopes, drainage problems, will not violate master plan requirements, and must
comply with manufacturer specifications including allowable slopes. The following
documentation shall be submitted for City review on a lot by lot basis:
1. Site plan showing location of proposed pervious pavers. The site plan shall be
drawn to scale and include sufficient topographic information necessary to review
site drainage.
2. Geotechnical conCUlTence letter reviewing the pervious paver proposal that
includes a review of the drainage impacts as well as other geotechnical issues,
mainly slope stability.
3. Pervious paver manufacturer specifications that includes type of paver, model #,
rate of permeability, allowable slopes, etc.
Regarding other infiltration systems such as a drainage pipe or ditch to an adequately
designed drywell, please submit the following documentation:
1. Site plan showing location of proposed drainage system (ie. ditch, drywell, etc.)
The site plan shall be drawn t.p scale and include sufficient topographic
information necessary to review site drainage.
2. Geotechnical report prepared by a Geotechnical Engineer reviewing the drainage
system and drywell design proposal. The Geotechnical engineer shall review soil
and site conditions and provide sufficient information for making a determination
that a proposed site is appropriate for a drywell. The report shall specifically
address soil conditions for ensuring adequate percolation rates and address
slope stability.
3. Drywell design prepared by a licensed Civil or Geotechnical Engineer in
conformance with Springfield Standard Drawings 4-19 and 4-20 (attached).
ADMINISTRATION / TECHNICAL SERVICES / ENGINEERING: (541) 726-3753 . FAX (541) 736-1021
MAINTENANCE: (541) 726-3761 . FAX (541) 726-3621 TRANSPORTATION: (541) 726-3753 . FAX (541) 726-3781
ENVIRONMENTAL SERVICES: (541) 726-3694 . FAX (541) 726-2309
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Sl'AHIlARD
DEPT. OF PUBLIC WORKS mu.1IIIlG
DRYWELL SIZE COMPUTATION
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I BrAIiIW!Il
DEPT. OF PUBUC WORKS INDIVIDUAL LOT /ROOF DRAIN DR.\1IIIIG
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I 225 1'I1T8 BnlIm' DRYWELL SCHEMATIC
I SPRIIiG1'll:Ul. OR. V14'7'l 4-20