238th St SW- 8629-BLD20080815-20080814-Renneke Property_Stormmwater_review_Checklist.pdfStormwater Management Review Checklist
Date:
11/5/2008
(For New Developments with > 5,000 sq ft of new impervious surface
Site:
Renneke Propery
or North Edmonds Earth Subsidence and Landslide Hazard Area
Address:
8629 238th St SW
By: Jerry Shuster, P.E.
Complete
Incomplete
Comments
1
Project Overview Narrative
(A)
Description of existing site (include area of site)
X
(B)
Description of Proposed Development
X
(C)
Discuss offste drainage impacts to the site & from the site
X
(D)
Nearest mapped surface water body where site stormwater discharges.
X
(E).
Discuss disposition of storm water runoff before & after development
X
(F)
Provide map showing general location of the site & geographical
features
X
(G)
Description of predeveloped assumptions for site
X
(H)
Description of post developed conditions of the site
X
(1)
Description of Detention Requirements for Development
X
(J)
Description of Water Quality Requirements for Development
X
(K)
Other
2
Calculations
(A)
Area Calculations
X
(B)
Predeveloped Condition Runoff Curve Number
X
(C)
Predeveloped Condition Time of Concentration
X
The methods and the constants used to calculate the Tc should be presented in the text
(D)
Post Developed Condition Runoff Curve Number
X
(E)
Post Developed Condition Time of Concentration
X
See comment 2(C)
(G)
Sub basin routing
N/A
(G)
Predeveloped Condition Computer Model Results
X
Subject to review following resolution of Comment 2 (C)
(H)
Post Developed Condition Computer Model Results
X
Subject to review following resolution of Comment 2 (C)
(1)
Detention system assumptions
X
Subject to review following resolution of Comment 2 (C)
(J)
Detention system routing computer model results
X
Subject to review following resolution of Comment 2 (C)
(K)
Water Quality Storm Calculations
X
(L)
Other
3
Plan View- Drainage Conveyance
(A)
Label and clearly identify existing & proposed systems
X
Several pipes do not have slope or lengths and several new catch basins do not have rim
elevations. Provide this information for all pipes and structures
(B)
Identify slope, length, diameter & material for all pipes
X
See Comment 3 (A)
Catch Basin size/type (check size based on depth, pipe size & angles
X
The storm clean out near the southeastern property corner should be changed to a type 1 catch
basin.
I(D)ICatch Basin, invert elevations for all pipes I X I
(E) Downspouts; provide connection (w/ adequate depth) to retention X I I
(F) Pipe slope info versus inverts PCBs and existincl loil3e info I X ISee Comment 3 (A)
11/14/2008 Page 1 of 2
Stormwater Management Review Checklist
Date:
11/5/2008
(For New Developments with > 5,000 sq ft of new impervious surface
Site:
Renneke Propery
or North Edmonds Earth Subsidence and Landslide Hazard Area
Address:
8629 238th St SW
By: Jerry Shuster, P.E.
Complete
Incomplete
Comments
(G)
Profile storm system and show utility crossings
X
Potential conflict with water lines and catch basin in southwest corner of site -show cross-section of
crossing
(H)
Flow arrows as necessary
X
Other
—(I)
4
Plan View & Details- Retention/ Detention (R/D) & Water Quality
(A)
Scaled drawing of R/D pond, vault or pipe, including tract boundaries
X
(B)
Predeveloped & Finished Grade contours, show max water elev.
X
(C)
Dimension all berm widths (Ponds only)
N/A
(D)
Show 2 cross -sections through pond, 1 must show control structure
N/A
(E).Specify
soils and compaction requirements for pond construction
N/A
(F)
Location and detail of emergency overflow
N/A
(G)
Rock protection details
N/A
H)
Provide inverts of all pipes, grates, inlets, tanks, vaults & spot elev. of
pond bottom
X
(1)
Access road to control manhole and pond bottoms, plan & details
N/A
(J)
Section and plan view of control structure
X
(K)
Other
X
The current design does not allow for inspection of the control structure (as described into the
maintenance plan) nor does it provide access for cleaning out the vault. In addition , there is no
way to drain the vault to facilitate removal of sediment. An acess point must be provide in the vault
for proper inspection and maintenance.
Maintenance plan
X
5
Plan View: Other
A)
Show location, identification and dimensions of buildings, property lines,
streets, alleys & easements
X
B)
Show locations of structures on abutting properties within 25 feet of
t site.
X
P
Show section details of all retaining walls & rockeries, sections through
critical portions
X
(D)IOther
11/14/2008 Page 2 of 2