bld20100757-Clearwater-4.pdf
City of Edmonds
TH
121 5 AVENUE NORTH EDMONDS, WA 98020 (425) 771-0220 FAX(425) 771-0221
Website: www.ci.edmonds.wa.us
PUBLIC WORKS DEPARTMENT
Engineering Division
Plan Review Corrections Comments #4
BLD20100758 and
Plan Check : BLD20100757-Comments #4Date:
# June 13, 2011
th
Project Name/Address:
Clearwater 2 SFRs 22804 (Lot 8) and 22806 (Lot 7) 96 Pl W
Contact Person/Address/Fax:
Tom Berg tomberg58@yahoo.com Bob Murphy rcm@murphybuilding.com
Reviewer: JoAnne ZulaufDivision:Engineering
During review of the subject submittal, it was found that the following information, corrections, or
clarifications would need to be addressed. All Handouts and Standard Details referred to in these
comments can be accessed at our website: www.ci.edmonds.wa.us by clicking City Government / City
Department / Public Works / Engineering Division:
Please Note: Building Handouts do not include updated Engineering Division Requirements. Refer to
Engineering Handouts for all Engineering Requirements.
6/13/11 Comments #4 - Resub review below. Both Lot 7 and Lot 8 included in this review.
3/30/11: Comments #3 - Resub review below.
1/26/11 Comments #2 - Full Set of New Plans
See Comments #1 not included here for 11/15/10 Comments.
Comments #4: 6/13/11
Please resubmit a letter responding to each comment and 3 sets of revised plans/documents to a
Development Services Coordinator. Please contact me at 425-771-0220 if you have specific
questions regarding these plan corrections.
General:
1. 3/30/11 done.
2. 6/13/11 done.
3. 6/13/11 Not done. Add all dimensions to Site Plan. 3/30/11 not done.1/26/11 Not Done.
Show dimensions of structures, deck, driveway length and width at road and property line.
DATE FAXED/E-MAILED 6/16/2011 PAGE ___ OF __
16
4. 6/13/11 Not done. Please correct references to note the other two sheets. In other words, the
reference should be to Grading/TESC and Site plan on the Drainage/Utility Plan. 3/30/11 not
done. 1/26/11 Not Done. Note on plan: See Grading/TESC and Drainage/Utility Plans for
more information. Add similar information to the other plans to reference all.
5. 3/30/11 done.
6. 3/30/11 done.
7. 6/13/11 Done.
8. 6/13/11 not done. See #9 under Grading Plan New Comments.
Site Plan: 3/30/11 New Comments
1. 6/13/11 Not completely addressed. Please provide detail of curb/sidewalk ramp to be installed
consistent with City of Edmonds standard detail for residential driveway. If existing, please note
on plans. Show sidewalk on plans and provide detail or call out as existing.
2. 6/13/11 Not completely addressed. Add square footage to each section of impervious surface.
If deck is uncovered wood slated with no gravel or slab underneath, please label as uncovered.
If covered or will have a slab or gravel underneath, please add to impervious surface calculations.
3. 6/13/11 done.
4. 6/13/11
6/13/11 NEW COMMENTS:
5. Revise impervious surface calculations. See #1 under Stormwater Mitigation 6/13/11 New
Comments.
Grading/TESC:
1. 6/13/11 done.
2. 3/30/11 done.
3. 3/30/11 done.
4. 3/30/11 not done.1/26/11 Not Done. Please review minimum requirements of erosion
control for the classification of the project. Add all minimum requirements to the civil
general notes section. Reference Handout E 11.
5. 6/3/30/11 not done. 1/26/11 Not Done. Please review minimum requirements of erosion
control for the classification of the project. Add all minimum requirements to the civil
general notes section. Reference Handout E 11.
DATE FAXED/E-MAILED 6/16/2011 PAGE ___ OF __
26
6. 6/13/11 Not done. 3/30/11 not done. 1/26/11 Not Done. Indicate area of disturbance.
Outline on grading/tecs plan and label with square footage of the area. Also add sq
footage to E72 Worksheet.
7. 3/30/11 done.
6/13/11 NEW COMMENTS:
8. Graded areas are not addressed. Please show each bottom of footing. It appears that
stepped footings were used. Are lowest footings the bottom of the footing elevation? On
the grading plan as mentioned above, Engineering needs to see the current existing topos
and the proposed topos and where they tie in to each other. As this in the grading/tesc
plan, it would be helpful to show each level of grade with the square footage. It appears
from the architecturals Sheet A7 that this structure has three separate footing elevations on
one side and two levels on the other. The plan currently shows no change from the
existing elevations to the proposed elevations of those footings. Please revise plan to
clearly show changes. This plan can be shown kind of like a floor plan but each area
outlines different bottom of footing elevations. Please add a square footage total for each
area. The Planning division also needs to see the original pre-plat elevations. The civils
can be submitted at 1 10 scale if it would be easier to show all requested information.
Also, notes and details can be moved to an additional sheet.
9. The contours that are proposed with this project also need to be shown on the plans. The
site plan and drainage plan should show existing (plat asbuilt) and proposed (with this
project including storm system area) contours. The grading plan can include all three
contours, predevelopment, existing (plat asbuilt) and proposed with project. Please revise
all plans.
10. Show the TESC measures on the drawing. For example, remove the concrete driveway
and show the stabilized construction access. (The site plan shows the concrete driveway
and the final condition of the site with proposed construction).
11. The location of the silt fence does not meet the erosion hazard needs for construction of
the storm piping at the south of the lot. This work is proposed in areas of steep slopes and
erosion hazard zones, please see the attached map indicating these areas.
12. There are no TESC measures shown or mentioned for the installation of the storm
drainage system.
13. The south end of Lots 7 & 8, and the northern part of the easement in Lot 10 are in an
erosion hazard/steep slope zone. The plans proposed the storm system piping be installed
here. Due to the sensitivity of the area, the geotech report needs to address the
construction in this area. Tesc, whether all manual construction is required and what type
of restoration is necessary to stabilize the area and prevent further sluffing.
14. Please show the route intended to access the area of construct the stormwater system.
Areas include the piping along the south side of the lots, the piping in Lot 8 easement, and
the storm structure located in Lot 10.
DATE FAXED/E-MAILED 6/16/2011 PAGE ___ OF __
36
15. Grading is not shown for storm system. The system is designed to be level therefore
grading will be necessary to achieve this. See the Construction Recommendations section
of the 3/17/11 Liu Geotech report referenced in 5/3/11 Liu Geotech report. Excavation for
trenches is approximated between 5.5 to 8.5 ft. deep. Show system in proposed location
scaled, elevations, and appropriate TESC measures.
16. Please change Test to TESC in title of 12 Steps.. and in Step #11.. Construction
Sequence does not include Compost Amendment of Soils (See #18 under General Notes
on sheet C2). Please revisit the Construction Sequence. If access for construction of
storm drainage system is through the two lots then #6 cannot be completed first. In #8
note the amended soils requirement prior to stabilizing and removing tesc measures.
Stormwater Mitigation: (same comments as provided with Lot 8)
1. 4/6/11 done.
2. 4/6/11 done.
3. 4/6/11 done.
4. 4/6/11 done.
5. 6/13/11 done.
6/13/11 Stormwater Comments (Jerry Shuster, Stormwater Engineer)
The impervious surface table on plan sheet C2 does not have headings on the columns.
·
Please add headings to explain the numbers in each column. Decks will be considered
impervious if one or more of the following apply:
o Deck is made of solid material that does not allow rain water to run through it.
o Deck has slots where rainwater can run through but the ground under the deck
does not allow the rainwater to infiltrate into the ground
The 6 inch PVC pipes coming off the southeast corners of the homes on Lot 7 and Lot 8 have
·
slopes of 54% and 40% respectively. Pipes with slopes of 20% or greater need to have pipe
anchors. The yard drains where these steep sloped pipes tie into need to have solid lids
called out.
The infiltration "trench" calculations are not acceptable. The modeling assumptions used to
·
develop the pre-sizing tables assume a 2 foot wide trench, either 18 or 36 inches deep,
with only the length of the trench as a variable. If the designer wants to use the a wider trench,
then it need to be modeled per the Edmonds Stormwater Code Supplement. All infiltration
trenches pre-sized, or modeled and designed by an Engineer must have:
o Trench aggregate shall have a minimum void volume of 30 percent (1-1/2 to 1-3/4
inch washed rock).
o The location of the overflow shall be above the washed rock trench.
o Trenches located under driving areas must have 2 feet of cover from top of
wearing course to the top pipe.
DATE FAXED/E-MAILED 6/16/2011 PAGE ___ OF __
46
6/13/11 NEW COMMENTS:
1. There are significant discrepancies between the square footage show on the architecturals, the
civils,and the square footage used in the stormwater system design. Below are some rough numbers
showing the varying amounts. Please revise all plans, E72 worksheet, and stormwater system design
calculations using the correct impervious surface total.
Architecturals: Approx. 4500 sf (added d/w & s/w from civils
Civils : Approx. 4600 sf
Storm Design Imp: 4375 sf
Drainage/Utility Plan:
1. 6/15/11 done.
2. 3/30/11 done.
3. 3/30/11 done.
4. 3/30/11 done.
5. 3/30/11 done.
6. 6/15/11 cleanout not show at storm system per plan. Please add and call out rim and invert
elevations. 3/30/11 partial. 1/26/11 Not Done. Show existing (plat stub) and proposed storm
line on plans. Show full extent of system from house to stormwater system. Include rim and
invert elevations at all catch basins and cleanouts.
7. 3/30/11 done.
8. 6/15/11 Add invert elevation to connection at house. 3/30/11 not done. 1/26/11 Not Done.
Show connection of tightline/roof drains to storm system from house to storm line in easement.
A catch basin must be installed at point of connection. A single catch basin may be placed at
the property line between Lot 7 and Lot 8. Provide rim and all invert elevations. Remove label
that says Storm to plat storm system.
9. 6/15/11 done
10. 6/15/11 done
11. 6/15/11 done
3/30/11 Additional Comments
12. 6/15/11 not done. Are footing drains required by the building plans? If required then.. 3/30/11
Where will the footing drains be directed? If they are to be directed to the stormwater mitigation
DATE FAXED/E-MAILED 6/16/2011 PAGE ___ OF __
56
system, a letter from the geotech will be required stating that the current proposal has the
capacity to handle the additional drainage. If they are to be directed to a separate system,
please show system on plans and provide a detail.
13. 6/13/11 Impervious calculation box does not have columns labeled and appears to have
errors. Please revise. 3/30/11 Impervious surface calculations box must be included on the
Storm Drainage sheet.
14. 6/13/11 Not done. Please submit a recorded easement agreement allowing Lot 7 to cross Lot
8 to reach the stormwater mitigation system.
6/13/11 NEW COMMENTS:/
15. Please revise sheet title to Drainage/Utilities.
16. General Notes #14 Please revise to See Architectural drawings to determine if footing
drains are required. Footing drains shall not be connected to the storm system.
17. General Notes #16. Please remove perimeter foundation drains and other external
drains.
18. Provide detail of full extent of storm system including rim, invert, bottom and top of trench.
Section detail includes rim and invert elevations that are not consistent with the submitted
geotech report. See Construction Recommendations section of the 3/17/11 Liu Geotech report
referenced in 5/3/11 Liu Geotech report. Excavation for trenches is approximated between 5.5 to
8.5 ft. deep.
19. Label existing storm system and proposed storm system.
20. Show the full extent of the sewer line. Label point of connection for the houses as existing
plat stub out or new connection.
21. Sewer call out west of house on lot 8. Please provide more information. Existing?
Proposed? If so, what is it connecting to ? Why two sewer connections necessary for house?
Show extent of sewer line to point of connection.
Please resubmit 3 copies of the revised plans/documents to a Development Services Coordinator. Please
contact me at 425-771-0220 if you have specific questions regarding these plan corrections.
DATE FAXED/E-MAILED 6/16/2011 PAGE ___ OF __
66