20140717163814622.pdfENGINEERING� INC,
July 16,2Oi4
Jennifer Lambert
Engineering Technician
City ofEdmonds
Public Work Department
WAM 007-01
IF
RE: Second Preliminary Engineering Plan Review Comments for Griffin — 804 Bell St,
Permit Application M BLD20140251
Dear Jennifer,
This letter kaintended tosummarize the changes made tnthe engineering package reviewed during the
second permit review for this project. This letter addresses comments from you along with other staff
members which were provided in an email dated June 25' 2014. | have tried toformat this letter to match
your comment email for easier understanding.
Cover Sheet (1of4)
1. OK
5161/4Comment: Please add the utility purveyor information.
5/6/14 Response - Utility purveying information has been added to cover sheet (power,
phone, cable, gas, etc.)
6125114—Comment was addressed, however, the sewer and water is City of Edmonds
and not Olympic View. Please revise the plans accordingly.
3. OK
4. DK
S. DK
O. OK
7. OK
8. OK
SVYPPP (2 of 4)
General
1. DK
2 OK
3. 0K
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ENG,NEER,N., INC.
5. OK
Construction Sequence
1. OK
TESC
1. OK
2. OK
3. OK
4. OK
Drainage & Grading Plan (3 of 4)
General
1. OK
2. OK
3. OK
4. OK
5. OK
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Sewer
2. Note added for tree to be removed. However, existing sewer lateral shall be abandoned.
5/6/14 Comment: Please show the side sewer from the sewer main line to the house.
a. Please note if the sewer lateral is proposed or existing.
b. The existing sewer will need to be inspected to determine if it can be reused. The City
is currently in the process of determining if the tree located on Bell St near the existing
sewer needs to be removed. If the tree does not need to be removed, and if the existing
sewer cannot be reused due to root intrusion, the new sewer will need to be located such
that it will not create any damage to the tree and will not be subject to root intrusion.
5/6/14 Response - Sewer lateral is shown connecting from the main to the house and
noted as existing. A sewer service note has been added to sheet stating that the new
SFR shall utilize the existing sewer unless subject to root intrusion and therefore a new
sewer line shall be located.
6/25/14 — Comment was addressed, however, it has been determined that the tree can
be removed. Please add a note if the tree is to be removed and revise the note
accordingly.
3. A new sewer line is proposed and shown from the house to the main to insure a forward
fall.
5/6/14 Comment - Please show the invert elevations at the main and the house so that
slope and coverage can be verified.
5/6/14 Response - Invert elevations at the main and house are shown.
6/25/14 — Comment was addressed, however, the invert elevations provided indicates
that the slope of the sewer line has reverse fall. Please verify and revise the elevations if
they are incorrect. If they elevations are indeed correct, please refer to the handout #E62
for engineering requirements for sewer pumps. Please note that the City does allow E -
One pumps.
4. OK
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ENGINEERING, INC.
6. Please refer to Drainage & Utility Plan (sheet 3). Pipe material and size are shown on
drainage sheet and was shown on sheet from 1St review.
5/6/14 Comment - Please note what pipe material and size will be used for the sewer.
516/14 Response - A 6" PVC pipe is used for the sewer line and is noted on the
sheet.
6/25/14 – Comment was not addressed.
Water
1. Back of new water meter now shown at the property line.
5/6/14 Comment - It appears that a fire sprinkler system is required for this property. The
existing water service line from the watermain to the meter is not the appropriate size and
a new tap will be required.
a. Please show the new line from the watermain to the house.
b. Please show the back of the water meter located at the property line (where the water
meter is within the right-of-way).
c. Please add a note that a 1 "meter is to be installed.
d. Please label the water service line as 1 %" and note the pipe material and tracer wire.
5/6/14 Response - Fire sprinkler note added to sheet. A note has been added to
remove/abandon existing water service line. A note has been added to install a new 1"
meter and a new water line is shown from the main to the house. The water service line
is labeled as 1 %" copper pipe with tracer wire.
6/25/14 – Comment (b) was not addressed.
C31'•T1
1. The stormwater management system has been designed based on total impervious area
on-site. The impervious area summary table is now updated to show zero non-regulated.
5/6/14 Comment - The impervious surface calculations state that there is 1, 088 sq ft
of exempt impervious surfaces. However, everything was demolished and would .be
considered new impervious surface (driveway, walkway, covered porch, roofline, etc.
should be included in the impervious surface calculations). Please revise the
impervious surface calculations and redesign the stormwater management system
accordingly.
6/6/14 Response - The impervious surface table has been updated to show zero
exempt/replaced impervious surfaces and the total proposed impervious surfaces as
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new. However, this does not change the design of the stormwater management system
since this design was already based on the total proposed impervious surfaces (new +
replaced).
6/25/94 — Comment was addressed. However, even though the walkway may not be
directed to the onsite stormwater management system, the system shag be designed for
the total impervious area on the lot. Therefore, there should be a zero in the non-
regulated box and all impervious surface area on the lot should be new. The total
regulated area and the total area proposed to be mitigated by LID should be the same
number.
2. The stormwater runoff generated by the proposed PGIS shall be collected by a yard
drain/catch basin and directed to a dry well at the southwestern corner of the site.
5/6/94 Comment - Please show how the stormwater runoff form the driveway will be
collected and discharged to the stormwater management system.
5/6/14 Response - The stormwater runoff generated by the proposed impervious
driveway surfaces will be dispersed on-site via a transition zone. A transition zone is
shown on the western, downslope side of the driveway and a detail is shown on the
sheet.
6/25/14 — The surface area from the driveway has to discharge to an approved system
(such as an infiltration system). The transition zone is not an approved stormwater
management system. Please revise the plans to either show the surface water runoff
from the driveway discharging to the proposed infiltration system or to a separate onsite
stormwater management system.
3. OK
4. OK
5. OK
6. A new infiltration trench was designed using the Puget East 36 rainfall in WWHM per the
Stormwater Supplement. The trench was simulated using a gravel trench bed for the
proposed roof surfaces. This changed the sizing to 120 sf of required trench. Therefore
the new trench will be 30 feet long, 4 foot deep and 5 feet wide. Please see revised
drainage report and plans for details.
5/6/14 Comment - The stormwater modeling needs be revised as follows:
a. Use the Puget East 36 rainfall per the Stormwater Supplement
b. Simulate the infiltration trench as a "gravel trench bed" in WWHM not as a vault.
5/6/14 Response - A new infiltration trench was designed using the Puget East 36 rainfall
in WWHM per the Stormwater Supplement. The trench was simulated using a gravel
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trench bed for the proposed roof surfaces. This changed the sizing to 200 sf of required
trench. Therefore the new trench will be 40 feet long, 4 foot deep and 5 feet wide.
6/25/14 — Comment was partially addressed. In 6(a), we stated that the Puget East 36
rainfall needed to be used; however the Puget West was used. Please revise
accordingly.
Dry Utilities
1. Approximate location of proposed underground dry utilities shown on Drainage and Utility
Plan sheet (sheet 3).
5/6/14 Comment - Please show the location of the dry utilities (power, gas, phone, etc.)
so that separation can be verified.
5/6/14 Response - The existing dry utilities (phone, power) are shown on this sheet.
6/25/14 — Comment was not addressed. The proposed location of the dry utilities are not
shown on the plans.
2. OK
Soil Management (4 of 4)
No Revisions
ENGINEERING, INC. fe -4ZS.:307.:3B20
Thank you for taking the time to review the revised plans for this project. Please feel free to contact me
with any questions you may have.
Sincerely,
?achelA.Jacobs
Civil Design Engineer