response letter 8-8-19.pdfI E CA
INSIGHT ENGINEERING CO.
August 21, 2019
JoAnne Zulaf, Engineering Technician
121 5ch Ave N
Edmonds, WA 98020
(425) 771-0220
Re: 2351h SFR — BLD20190544
IECO No. 18-0969
Dear JoAnne,
The project referenced above is revised in response to the review comments dated August 6,
2019. The review comments are numbered on the letter and have been addressed in italics as
follows:
GENERAL
1) Done.
2) 8/6/19 Not Done. Submit ROW Permit Application form.
I believe this has been cleared up. We are not going in the right of way.
3) 8/6/19 Not Done. Submit Side Sewer Permit Application form.
Project is in Olympic View Sewer & Water District.
4) Done.
5) 8/6/19 Not Done. This should address only the infiltration trench that will be constructed
as part of the sfr process. All others were constructed during the short plat improvement
construction and are covered under the recording documents. Please submit required
document — notarized but not recorded. A Stormwater Covenant is required to be
recorded against the property based on the proposed stormwater facilities for the project.
Please complete the covenant, including notarization and any required exhibits and
submit to the city. Ensure the stormwater covenant meets Snohomish County Record
Drawing requirements. The documents must be complete, but will not be recorded prior
to permit issuance. Prior to construction, final location of facilities are to be verified (by
field inspection and asbuilt) and then the covenant will be recorded.
PO Box 1478 • Everett, WA 98206 • Phone: (425) 303-9363
Fax: (425) 303-9362 • Email:info@insightengineering.net
N/A —No infiltration trenches to be installed as part of the building permit process. All
stormwater facilities were installed as part of the short plat process.
6) Done.
7) Done.
�iTF, PLAN
8) 8/6/19 Partly Done. Please read carefully and finish. Also the utilities should be dark
enough to see them. Accurate measurements should be provided to the detail where area
can be calculated for the full driveway on the lot, and the patio, and the roofline. The site
plan shall show all utilities with labels stating name of utility or specific line types. Sewer
is not shown to the main. The infiltration trenches on both sides of the property shall be
labeled and noted what run off they are collecting. The driveway and structures shall be
dimensioned.
Please see new dimensioned areas.
9) Done.
TESC
1) Done.
2) 8/6/19 Partially done. Add along the infiltration easement on the east property line.
Orange protective barrier fencing or orange silt fencing shall be placed at the drip line of
trees to remain and around areas proposed for low impact development techniques, such
as rain gardens, infiltration systems, etc., to protect the area from compaction.
Okay, the fence was added.
3) Done.
4) Done.
WATER
1) 8/6/19 Partially Done. Water line needs to be 1 '/2" from meter to house. Label on plans.
As indicated by the Fire Department, a fire sprinkler system is required for this property.
Typically, if there is an existing water service line from the watermain to the meter, the
water service line/meter will not be the appropriate size and a new tap will be required.
The applicant will be required to pay for the new tap on the main and the new meter.
Please revise plans to include the following:
a. Please add a note that a 1" meter is to be installed
b. Show the water meter located in the right-of-way, such that the back of the meter
is on the property line. The water meter shall not be located within the driveway.
c. Please show a 1-1/2" water service line to be installed from the back of the meter
to the house (as required for a combination fire and domestic service).
d. Please label the pipe material and note tracer wire to be installed on the water
service line.
PO Box 1478 • Everett, WA 98206 • Phone: (425) 303-9363
Fax: (425) 303-9362 • Email:info@insightengineering.net
The water line is shown to the water meter.
2) 8/6/19 Not Done. Show that there is a minimum of 3' of horizontal separation between
the water service and dry utilities (i.e. power, phone, gas, cable, etc.). A minimum of 10'
of horizontal separation is required between water and sewer lines.
The separation could not be met; therefore, a note has been placed on the plans to sleeve
the water line.
3) Done.
SEWER
1) 8/6/19 Partially Done. Label the public main. The Utility plan should show the entire
sewer run from the main line to the house.
The public main is labeled southeast of Lot B.
2) 8/6/19 Partially Done. Label pipe material, length and size. On the site. This is a review
of the sfr so we need to see all the information about the utilities to be constructed on the
sfr site. The sewer lateral (from the main to the property line/edge of easement shall be
6". Once on private property the sewer may reduce to 4".
The sewer main from the public main to the property is shown on the plan. The side
sewer to the house is labeled as 4 " PVC.
3) Done.
4) Done.
5) 8/6/19 Partially Done. Provide invert elevations for the cleanout at the property line and
at the house so that a minimum 2% slope and minimum 2' pipe coverage can be verified.
The invert at the house is 364.0. The pipe is shown at more than 2016.
DRY UTILITIES
1) Done.
STORMWATER
1) 8/6/19 Partially Done. Unable to verify without invert at house clean out. A minimum of
2' of cover is required for all pipes located under driveable surfaces, please revise plans.
All the house cleanouts have IE's now.
2) Done.
PO Box 1478 • Everett, WA 98206 • Phone: (425) 303-9363
Fax: (425) 303-9362 • Email:info@insightengineering.net
Comments from Zack Richardson, Stormwater Engineer
July 29, 2019
1. General: It appears that no drainage report or memo was included; included a drainage
report or memo which states how the site specific proposal under this permit meets the
requirement of ECDC 18.30 and/or how it complies with the previously approved plan.
a. Include sizing calculations for the infiltration trench.
Update: Report revised to provide calculation demonstrating the proposed
impervious is less than previously designed for, but it is unclear how the engineer
verified that the trench matched the previously approved design. Include report
text addressing how the existing trench, with location and size as shown, was
determined to be true and accurate.
Field verified existing trench onsite with contractor and appears to be built per approved
civil plans.
2. Nothing further
3. C2: Provide details, dimensions, and elevations for the infiltration facility as needed for
construction.
Update: This information is still needed for the "existing" trench. The trench, while
installed out -of -sequence, is actually required as mitigation for the currently
proposed improvements under this permit; therefore, all information needed to
re-create/verify the trench must be included in this plan set.
The existing trench was constructed as part of the short plat and verified by city
inspectors. I field verified the approximate size and location of the existing trench.
4. C2: Add & callout an inspection port; add detail as needed for construction.
Update: This information is still needed; if these improvements were not provided
previously, they shall be provided.
The cleanouts are called out on the sheet.
5. C2: Identify the two circular objects near north side of facility (assumed to be cleanouts);
provide detail as needed for construction.
Update: This information is still needed.
The cleanouts are called out.
6. Nothing further
7. Nothing further
8. Nothing further
9. New: Add as an appendix to the report, the necessary sheets to make up the "O&M plan"
for infiltration trenches.
PO Box 1478 • Everett, WA 98206 • Phone: (425) 303-9363
Fax: (425) 303-9362 • Email:info@insightengineering.net
The O&Mplan for infiltration is included with this letter. It was taken from the
previously approved drainage report for the short plat.
Please feel free to contact me with any questions or comments you may have.
Sincerely,
o~ SBrian alab, P.E.
PO Box 1478 • Everett, WA 98206 • Phone: (425) 303-9363
Fax: (425) 303-9362 • Email:info@insightengineering.net