HomeMy WebLinkAboutCAG1997-0133 - Supplement - King County Dept of Natural Resources - Provision of Surface Water Services - 11/05/2009 Additional Services
Interlocal Agreement Between King County and City of Kent
For The Provision of Surface Water Services
Scope of Work
Frager Road South—Roadway and Embankment Slump Repair
Stoneway Lower Revetment Repair
King County will provide services to the City of Kent under this Scope of Work pursuant
to the Interlocal Agreement Between King County and the City of Kent for the Provision
of Surface Water Services, executed March 26, 1997.
PROJECT DESCRIPTION
The January 2009 flood damaged a 185 foot-long segment of the Frager Road South-
Stoneway Lower Revetment at RM 19 55 on the left bank of the Green River. This
revetment supports and protects the shoulder of South Frager Road in Kent, a two lane
asphalt road that currently serves as a maintenance access road between S. 2121h Street
and South Meeker Street Frager Road also serves as a means of access to the City of
Seattle's Midway Landfill,lust upstream from the damaged location. The cause of the
failure is prolonged saturation of embankment soils following release of stored
floodwater during the January 2009 flood. Prolonged saturation of the riverbank and
roadway fill soils followed by rapid drawdown of river stage caused a deep-seated
rotational slope failure which has left the road completely unserviceable and dangerous to
trail users and maintenance vehicles In addition, damage to this riverbank and roadway
threatens the structural integrity of a pipeline conveying leachate from the City of
Seattle's now-closed Midway Landfill
The purpose of this project is to perform emergency repairs to the failed road by
stabilizing the river embankment and surface roadway and preventing damage to the
leachate force main. The roadway must also be kept in a serviceable condition for flood
patrol vehicles to travel along the left bank of the Green River between South 212th Street
and South Meeker Street. Because of flood damage to Howard Hanson Dam at RM 65,
the Green River valley is highly vulnerable to extremely severe flooding should a large
flood occur during the upcoming rainy season(s). The roadway also supports essential
access to SPU infrastructure associated with the landfill that must be inspected and
maintained.
TASKS
King County will perform the following tasks to complete the revetment repair:
A. Temporary Erosion and Sediment Control
1. The following tools and materials will be available on site and deployed as
needed during construction:
• Straw bales for slope mulching
• Silt fencing for perimeter siltation control
Additional Work- Interlocal Agreement j
King County and City of Kent
Surface Water Surfaces
• Hand brooms, street sweepers, and wash trucks for control of sediments on paved
traffic surfaces
• A spill response kit
2. The following materials will be available for transport to the site as needed:
• Crushed rock for control of soil pumping on exposed soils in heavy traffic areas
• Crushed rock for staging areas and road shoulders
• Pea gravel and/or straw wattles for filter berms and for anchoring silt fence
installations
All paved traffic areas will be kept free from sediment accumulations by daily sweeping
or washing.
B. Road and Embankment
1. Establish traffic control flaggers and set concrete Jersey-wall barricades as needed
to isolate existing failed easterly (northbound) lane from traffic. Place steel plates
over the leachate line location and relocate the remaining westerly (sorthbound)
lane to create a temporary access roadway, with fill placement as shown on the
plan sheets.
2. Maintain all traffic in remaining (westerly) lane with traffic control flaggers
throughout construction activities.
3. Coordinate with the City of Kent and Seattle Public Utilities prior to and during
construction to address concerns about maintaining Frager Road South and the
landfill leachate force main.
4. Remove cracked asphalt from failed portions of Frager Road South and dispose of
in an approved asphalt recycling location.
5. Remove and salvage an existing clump of willows from the slumping soil block,
with intact roots and set aside in wet conditions for re-use.
6. Working with the Project Ecologist, identify and flag the OHWM at each end of
the project site, and in additional locations as may be practical for survey
identification and reference during construction.
7. Working from the top of slope along the remaining road edge, excavate a narrow
shelf or bench within 3 feet of the identified OHWM, of sufficient width to install
a silt fence the full length of the slope repair area. Leave an intact band of
vegetation along the margins of the channel a minimum of 3 feet in height from
the OHWM when installing the silt fence.
8. Excavate and remove failed road and slope materials from the slump area in order
to form an access ramp and construction bench landward from the silt fence, and
Additional Work Interlocal Agreement 2
King County and City of Kent
Surface Water Surfaces
from one to 3 feet above the OHWM, as shown on the plan view and cross-
section diagrams.
9. Maintaining a minimum one-foot high berm of earth or crushed rock to separate
the work from the water column, stabilize the construction bench as needed for
equipment and truck access to the work area by over-excavation and replacement
of unsuitable soils, placement of geotextile fabrics, placement of quarry spalls and
crushed rock, and placement of wooden soil mats as needed.
10. Operating from the stabilized construction bench, place 56 each 28 foot long, 14-
to 16-inch diameter untreated fir pilings in three offset (staggered) rows at 10 feet
on center, as shown in the plan view and cross section diagrams. Drive the tops
of the pilings flush with the elevation of the OHWM, or to refusal, and trim to the
OHWM elevation as necessary.
11. Secure logs with rootwads to the pilings and to each other as directed by the
project engineer and the project ecologist, forming a matrix of logs seated on the
river bed below the OHWM, along the length of the excavated bench and
construction ramp areas. Chain the logs to 1-1/8 inch holes drilled in the pilings,
using 5/8-inch high strength chain. Chain the logs to each other using 1/4 inch un-
galvanized deck- lashing chain.
12. Proceeding from the downstream end of the bench and progressing upstream to
the access ramp, excavate and remove all temporary construction stabilization
materials from the bench and replace them with amended planting soil along the
full length of the construction bench. Place willow and dogwood cuttings and
additional potted plants along the riverward margins of the planting soil area prior
to final soil placement along this edge, and cover them as directed by the project
engineer and the project ecologist.
13. As bench excavation and soil placement proceed upstream, place 36 each 28-foot
long 16 inch-to-I8 inch untreated fir pilings at 10 feet on center, along the full
length of the bench in 2 staggered rows as shown on the plan sheets and cross
section views Drive until pile tops are approximately 3-1/2 feet above the
OHWM elevation or to refusal, and then trim tops to this elevation
14. Secure 16 each 28 foot-long logs with root wads to the pilings on the bench and to
each other as directed by the project engineer and the project ecologist Chain the
logs to 1-1/8 inch holes drilled in the pilings, using 5/8-inch high strength chain.
Chain the logs to each other using'/4 inch un-galvanized deck- lashing chain.
15. Place a minimum one-foot thick layer of amended planting soil the full length of
the bench, along the base of the slope at the slope reconstruction position shown
in the plan drawings and cross section views
Additional Work lnterlocal Agreement 3
King County and City of Kent
Surface Water Surfaces
16. Place live willow and dogwood cuttings the full length of the soil layer thus
created, at the base of the slope, and supplement these with additional native
potted shrubs and trees, as specified by the project ecologist.
17. Cover the plant materials with an additional minimum one foot thickness of
amended planting soil.
18. Roll out a length of"DeKowe 900"or equivalent coir fabric along the covered
soil and plant layer, with 5 feet of fabric to be covered with an approved pit run
fill lift. Temporarily secure the balance of the fabric over the waterward edge of
the planting layer Place a maximum two feet thickness of an approved pit run
soil material the full width of the construction bench, covering and thereby
imbedding the lower edge of the coir fabric under the fill layer Shape the
riverward edge of the fill soil to a smooth and uniform configuration at a 211:1 V
slope angle
19 Fold the balance of the coir fabric over the completed soil lift and pull to a snug
fit using the bucket of the excavator. Stake the fabric in place using 2 foot long
wooden survey stakes.
20 Repeat the previous 5 steps to the top of slope Bury the upper end of the last coir
wrap in a 2 foot wide by one foot deep V-trench.
21. Replace, re-grade, and compact the road grade and road shoulder with 2-1/2 inch
"minus" crushed rock, to within 0.4 feet of the finished grade elevation, as shown
on the plans and cross section drawings. Surface the prepared subgrade with 0.3
feet of 1-1/4 inch"minus" crushed rock, and compact with a vibratory roller.
22 Remove the steel plates and temporary access roadway fill materials from over
the top of the leachate line and re-establish the ditchline along the westerly
margins of the site, as shown in the plan and cross section drawings.
23 Place 0 2 feet of rolled hot asphaltic surface to re-establish the asphalt roadway to
the satisfaction of the City of Kent Department of Public Works. Smoothly match
the ends of the new pavement to the existing pavement at each end as shown on
the plans.
24. Re-establish the roadway shoulders with 5/8 inch"minus" crushed rock, to a
minimum distance of two feet along each side of the new asphalt roadway..
25. Hydroseed the finished slope areas.
26. Water all plantings as needed until the onset of reliable rains in the winter of
2009-2010 Maintain watering during ensuing summer months, and replace
diseased or dying plants as needed for vigorous plant establishment over the next
3 to 5 years.
Additional Work ]nterlocal Agreement 4
King County and City of Kent
Surface Water Surfaces
SCHEDULE
Work is anticipated to take place during November 2009 Hours of construction between
7.00 am and 10 pm.
ESTIMATED COST
The project work is currently estimated to cost $507,000. The County will provide the
City all invoices and costs incurred for construction costs. If any change order is needed,
the County will immediately inform the City in writing of the proposed changes and the
change order work shall not proceed until the City has approved The amount of any
change orders shall not cause the total costs for the project work to exceed$570,000.
Authorized by City of Kent:
Name: Suzette Cooke
ttl r
Additional Work Interlocal Agreement 5
King County and City of Kent
Surface Water Surfaces
W ,�� �.rrR� k+l=�4�� ��{x.�#��°re '�'""r a„� • �,r d$�� �i l� `'�� 1W
�.rE'Y' I -•kq row ate..` r s �, �:
�Y
llz-
G � 4
� i Y
t
�.-•-
Extent of Settling in March 2009
�_'�� � �• [[[ �. l � , 1t1'� "Jib
� 1 V• ��I I 1�x � ." iR, 1
!!!!
tv` � 7 Y ,4..,, !� � nk� wv dJ." ! •✓..b 5'. t.r�',
. • i.�� . � ��� (,:4�� �yam+(, ,�
M
a� Pry
� �r . •N Y
�Y i r dh 61 c�� Fo A n
1
I
Length of road settlement is approximately 185
S9' �
4n� .'k, ;•*•- �u F24�1' L r t���lq��'C�x v�� .f �� I`i,�Sx
d!`=t'
fee
PUBLIC WORKS ENVIRONMENTAL ENGINEERING
Michael Mactutis, P E
Environmental Engineering Manager
400 West Gowe
• Kent, WA 98032
KEN T Fax. 253-856-6500
WASHINGTON
PHONE: 253-856-5500
November 3, 2009
Mr. John Koon
King County Flood Control Zone District
King Street Center - DNRP
201 S Jackson St Ste 600
Seattle, WA 98104
RE: Frager Road South - Roadway and Embankment Slump Repair
Dear Mr. Koon:
The City of Kent is requesting the King County Flood Control Zone District (KCFCZD)
under the provisions of the 1997 Interlocal Agreement to perform the necessary
repairs to Frager Road South and its subgrade foundation. The Frager Road Section
was damaged during the January 2009 flood located approximately at River Mile 19.55
on the left bank of the Green River.
Per the Interlocal Agreement the City of Kent will write a service request, provide a
scope of work to King County, and King County will in turn provide a cost estimate.
We are attaching the Scope of Work. We understand that KCFCZD has applied for the
necessary permitting to begin the project in November 2009.
If you have any questions please call me at 253-856-5552.
Sincerely,
Beth Tan, P.E.
Environmental Engineer III
Cc: Mike Mactutis, P.E., Environmental Engineering Manager
Alex Murillo, P.E., Environmental Engineering Supervisor
Tim LaPorte, P.E., Acting Public Works Director
3
C
N
Y
U
3
3
3
• MAYOR SUZETTE COOKE
City of Kent Public Works Department
Larry R Blanchard, Public Works Director
v �
l
.zZ
0-,Q i
l
,t
AN INTERLOCAL AGREEMENT
BETWEFNKING COUNTY AND TBE CITY OF KENT
FOR TBE PROVISION OF SUFXACE WATER SERVICES
1 This agreement is hereby entered into by Mng County,Department ofNatural Resources,
2 and the City ofKent,a municipal corporation,for the provision of surface water related services
3 to Kent.
r
4 WHEREAS,Kent has an established surface water program to preserve and protect the
5 environment,public and private property,and the health and welfare of its citizens;
6 - REERFAS,Kent has identified the need to enhance its surface water program due to
7 annexation activity and emerging water resource priorities;
s WHEREAS,through an interlocal agreement,King County is able to provide appropriate
9 services to Kent's residents and property owners through its surface water related programs,and
10 the City wishes King County to provide these services,and
11 WHEREAS,pursuant to RCW 39.34,the Interlocal Cooperation Aot,the parties are each
12 authorized to enter into an agreement for cooperative action;
13 NOW THEREFORE,the parties hereto agree as follows:
14 L Purpose of the Agreement•
I
15 A. The purpose of this Agreement is to establish mechanisms by which King County will
16 provide the City of Kent and its residents and property owners with certain surface
17 water management services,as determined by the parties.
19 B. This Agreement sets forth the services which the parties agree will be provided within
19 the Kent city limits and provides cost estimates for those services.
20 C. This Agreement establishes procedures for documenting the levels and costs of actual
21 services delivered and for billing the City of Kient.
i
22 D. This Agreement provides for malting additions and adjustments to the types,levels,'
23 and costs of services requested by Kent and provided by King County in the future.
24 II. Management of Contracted Drainage Services
25 A The City and County will by written correspondence identify the City and County
26 liaisons responsible for admmistering this agreement,including day-today service
27 provision,contract performance,and notifying the County of requests for additional
29 services or for changes to agreement terms
29 B. The liaisons will implement procedures,as set forth agreement section 1V.B.,for
30 adjusting the type and level of services to be provided to the City,and/or for
31 requesting and providing expanded or additional services which may be identified in
32 the fixture.
33 C. The County and City liaisons will be available to meet with 10 days'notice to review
34 contract performance or to review or resolve service issues.Any issues which cannot
35 be resolved by the County and City liaisons shall be referred to the Director of the
-1-
REQUEST FOR MAYOR'S SIGNATURE
11111,
KENT Please Fill in All Applicable Boxes
WASHINGTON
' Routing Information (ALL REQUESTS MUST FIRST BE ROUTED THROUGH THE LAW DEPARTMENT)
Originator t Phone (Originator)
Date Sent �L;>�F I 2,,CO Date Required:
Return Signed Document to. CONTRACT TERMINATION DATE:
e g m
VENDOR NAME: DATE OF COUNCIL APPROVAL:
Brief Explanation of Document:
S c wo> K n '�t�KaQ -i`vlLe� tx t{C �t� E (qq7
c et G. C ¢ov,ceS b evez.� `dZ� i
Cc, , kd5g CCAY",j
j Ul hceve '
�,�►
C,4} 1 `�-
�-� lL2�vU
41cFkIv 6s
lec -F1^0d' tiu�e�er�i'v.�
' ll�j r �l Maur,•
All Contracts Must Be Routed Through the Law Department
(Thu Area to be Con pleted By the Law Department)
, l
Received:
Approval of Law Dept.
Law Dept. Comments:
s 4cn1 . 1 , ���s 1 cces� ce ac by
-�'..,I�ex�lc�/��tc k'1e� C1 Ioo/,
C-�L 1ti.4�-�-'`.� �, �� n
F, t7 M q -1,- i �r m-.L� u� �C1 OC `f �
v -{ • C- b1-f_ �cr 12.n"l.'_C.riC.L.C�. (�,J.n rS c�.C�
Date Forwarded to Mayor.
Lx`lt2c� 1--P�r1GCrtLL1.-` '�^_c-- C1 � F�M(� w1[t -to-E- ctllJ..J l�' IGrtwc..CtCD. �
+♦( � 0C Shaded Areas to Be Completed by Administration Staff 1a �I+ati� f f,ro�
�0�
Received:
Re mentions & Comments: �� myi2-)
Disposition
r 1`4
Date Returned:
lage58,70 • 3/05