eng20150285-Applicant Response Comments 11.19.2015.pdf1601 Fifth Avenue, Suite 1600 Seattle, WA 98101 206.622.5822 kpff.com
November 17, 2015
Ms. Jeanie McConnell
City of Edmonds
Public Works Department
Engineering Division
121 Fifth Avenue North
Edmonds, WA 98020
Subject: Application #eng20150285
Edmonds School District Seaview Elementary School
Response to Civil Plan Review Comments
Dear Jeanie:
RECEIVED
NOV 19 2015
DEVELOPMEW SERVICES
The following outlines our response to City of Edmonds Civil Plan Review comments dated
September 17, 2015. Your original comment letter is enclosed for reference.
1. The CBL provided in the response comments is not for Greenshield Systems. Please
updated accordingly.
Response: Greenshield Systems business license is NR -021698.
2. Thank you for including the construction sequence in figure 2, however, this information
needs to be provided on the construction plan set that is not bound in the drainage study
Response: Per email correspondence from Jeanie MConnell, City of Edmonds, dated
October 14, 2015, a construction plan set is not required and that the included figures in
Appendix A are adequate for this project. Comment has been retracted.
3. Thank you for including a TESC plan as figure 3; however this information needs to be
provided on the construction plan set that is not bound in the drainage study.
Response: Per email correspondence from Jeanie MConnell, City of Edmonds, dated
October 14, 2015, a construction plan set is not required and that the included figures in
Appendix A are adequate for this project. Comment has been retracted.
4. [There are two parts to this comment as follows]
a. Thank you for showing the easement and sanitary sewer main on Figure 4. This
information is also to be provided on the plan set that is not bound in the
drainage study.
Response: Per email correspondence from Jeanie MConnell, City of Edmonds,
dated October 14, 2015, a construction plan set is not required and that the
included figures in Appendix A are adequate for this project. Comment has been
retracted.
b. Comment b, below has not been addressed. An email was sent to the applicant
on 9/14/2015 indicating an encroachment permit is in fact a requirement of this
Ms. Jeanie McConnell
November 17, 2015
Page 2
permit approval, however, the City would find it acceptable to condition the permit
to require recording of the agreement prior to final construction approval.
Response: Encroachment permit application has been submitted with this
comment response.
5. Per the City's request in the July 10, 2015 comments a quantitative downstream analysis
has been performed to assess the effect of the project on the capacity of the City's storm
drainage system downstream of the proposed improvements. Appendix D to the
aforementioned document contains that analysis.
a. The analysis assumes "Existing drain slope of 2%." The source of this
assumption is not, but should be explained.
Response: The report indicates that 2% is a conservative assumption. Per the
October 14, 2015 email from Jeanie McConnell, Jerry Shuster noted that "Other
than a survey, the only other way to do it is to go to the online GIS, get
information on the inverts of each manhole/catch basin (assume pipe in and out
is at the that invert). This number is a measure down from the rim to invert.
Look at the contour layer and approximate an elevation for each invert. With this
information and the measure length of each pipe, they can get an approximate
slope for each." Utilizing this methodology the existing pipe slope is actually 4%.
A slope of 2% has been used to be additionally conservative.
b. The hydrologic modeling assumes soils are Group B. The Snohomish County soil
survey as well as SvR report in Appendix III call out HSG Group C. Re -model
using HSG C.
Response: Flows have been modeled using HSG C.
Hopefully these responses meet with your approval. Please feel free to contact me directly at
(206) 622-5822 with any questions or comments.
Sincerely,
Thaddeus J. Egging, PE, LEED AP BD+C
Principal
TJE:kjl
Enclosures
114407.21