HomeMy WebLinkAboutCESCL Inspection_RTC_02-12-26Construction Stormwater Site Inspection Form
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Project Name Renton Transit Center Permit # WAR314062 Inspection Date 02/12/26 Time 1015
Name of Certified Erosion Sediment Control Lead (CESCL) or qualified inspector if less than one acre
Print Name: Ashley Kollmorgen
Approximate rainfall amount since the last inspection (in inches): 0.68”
Approximate rainfall amount in the last 24 hours (in inches): 0.0”
Current Weather Clear x Cloudy Mist Rain Wind Fog
A. Type of inspection: Weekly Post Storm Event Daily
B. Phase of Active Construction (check all that apply):
Pre Construction/installation of
erosion/sediment controls
Clearing/Demo/Grading Infrastructure/storm/roads
Concrete pours Vertical
Construction/buildings
Utilities
Offsite improvements Site temporary stabilized Final stabilization
C. Questions:
1. Were all areas of construction and discharge points inspected? Yes No
2. Did you observe the presence of suspended sediment, turbidity, discoloration, or oil sheen Yes No X
3. Was a water quality sample taken during inspection? (refer to permit conditions S4 & S5) Yes No
4. Was there a turbid discharge 25 NTU or greater, or Transparency 6 cm or less?* Yes No
5. If yes to #4 was it reported to Ecology? Yes No
6. Is pH sampling required? pH range required is 6.5 to 8.5. Yes No
If answering yes to a discharge, describe the event. Include when, where, and why it happened; what action was taken,
and when.
Sampling Results: Date: 02/12/26
Parameter Method (circle one) Result Other/Note
NTU cm pH
Turbidity tube, meter, laboratory 20.5 CB DP-01 (47.47123 N, 122.21709 W)
Turbidity tube, meter, laboratory
Turbidity tube, meter, laboratory
Construction Stormwater Site Inspection Form
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D. Check the observed status of all items. Provide “Action Required “details and dates.
Element # Inspection Response Description Action
required
(describe in
section F)
yes no n/a
1
Clearing
Limits
Before beginning land disturbing
activities are all clearing limits,
natural resource areas (streams,
wetlands, buffers, trees) protected
with barriers or similar BMPs? (high
visibility recommended)
Pre-installation of high vis
fencing for tree and shrub
protection.
2
Construction
Access
Construction access is stabilized
with quarry spalls or equivalent
BMP to prevent sediment from
being tracked onto roads?
Sediment tracked onto the road
way was cleaned thoroughly at the
end of the day or more frequent as
necessary.
3
Control Flow
Rates
Are flow control measures installed
to control stormwater volumes and
velocity during construction and do
they protect downstream
properties and waterways from
erosion?
Treatment system will be
installed in the coming weeks.
If permanent infiltration ponds are
used for flow control during
construction, are they protected
from siltation?
4
Sediment
Controls
All perimeter sediment controls
(e.g. silt fence, wattles, compost
socks, berms, etc.) installed, and
maintained in accordance with the
Stormwater Pollution Prevention
Plan (SWPPP).
Pre-installation of silt fence and
asphalt berms.
Sediment control BMPs (sediment
ponds, traps, filters etc.) have been
constructed and functional as the
first step of grading.
Temp storage tanks coming in
the next few weeks.
Stormwater runoff from disturbed
areas is directed to sediment
removal BMP.
5
Stabilize
Soils
Have exposed un-worked soils
been stabilized with effective BMPs
to prevent erosion and sediment
deposition?
Construction Stormwater Site Inspection Form
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5
Stabilize Soils
Cont.
Are stockpiles stabilized from erosion,
protected with sediment trapping
measures and located away from drain
inlet, waterways, and drainage channels?
Have soils been stabilized at the end of
the shift, before a holiday or weekend if
needed based on the weather forecast?
6
Protect
Slopes
Has stormwater and ground water been
diverted away from slopes and disturbed
areas with interceptor dikes, pipes and
or swales?
Is off-site storm water managed
separately from stormwater generated
on the site?
Asphalt berm to be installed
along Northern perimeter to
prevent run-on.
Is excavated material placed on uphill
side of trenches consistent with safety
and space considerations?
Have check dams been placed at regular
intervals within constructed channels
that are cut down a slope?
7
Drain Inlets
Storm drain inlets made operable during
construction are protected.
Block additional CBs with
plastic to prep for rain event.
Are existing storm drains within the
influence of the project protected?
Install CB insert in NW area
CB.
8
Stabilize
Channel and
Outlets
Have all on-site conveyance channels
been designed, constructed and
stabilized to prevent erosion from
expected peak flows?
Is stabilization, including armoring
material, adequate to prevent erosion of
outlets, adjacent stream banks, slopes
and downstream conveyance systems?
9
Control
Pollutants
Are waste materials and demolition
debris handled and disposed of to
prevent contamination of stormwater?
Has cover been provided for all
chemicals, liquid products, petroleum
products, and other material?
Has secondary containment been
provided capable of containing 110% of
the volume?
Were contaminated surfaces cleaned
immediately after a spill incident?
Were BMPs used to prevent
contamination of stormwater by a pH
modifying sources?
Wheel wash wastewater is handled and
disposed of properly.
Construction Stormwater Site Inspection Form
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10
Control
Dewatering
Concrete washout in designated areas.
No washout or excess concrete on the
ground.
Dewatering has been done to an
approved source and in compliance with
the SWPPP.
Dewatering system to be
installed in the coming weeks.
Were there any clean non turbid
dewatering discharges?
11
Maintain
BMP
Are all temporary and permanent
erosion and sediment control BMPs
maintained to perform as intended?
12
Manage the
Project
Has the project been phased to the
maximum degree practicable?
Has regular inspection, monitoring and
maintenance been performed as
required by the permit?
Has the SWPPP been updated,
implemented and records maintained?
13
Protect LID
Is all Bioretention and Rain Garden
Facilities protected from sedimentation
with appropriate BMPs?
Is the Bioretention and Rain Garden
protected against over compaction of
construction equipment and foot traffic
to retain its infiltration capabilities?
Permeable pavements are clean and free
of sediment and sediment laden-water
runoff. Muddy construction equipment
has not been on the base material or
pavement.
Have soiled permeable pavements been
cleaned of sediments and pass
infiltration test as required by
stormwater manual methodology?
Heavy equipment has been kept off
existing soils under LID facilities to retain
infiltration rate.
E. Check all areas that have been inspected.
All in place BMPs All disturbed soils All concrete wash out area All material storage areas
All discharge locations All equipment storage areas All construction entrances/exits
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1
Sound Transit Renton Transit Center
Environmental Weekly Meeting Minutes
February 12, 2026, 9:45am
1. Submittals
a. Environmental Compliance Strategy Plan – In development (Shimmick/Encore)
b. Air Pollution Control Plan – In development (Shimmick/Encore)
c. Sanitary Sewer Authorization – Submittal planned for week of 2/9 (Encore)
d. Trucking Plan – Ashley working with Badger Daylighting on getting disposal sites
setup for contaminated site water. (Encore)
e. Site Specific Waste Management Plan – In development (Shimmick)
f. HCS-SHP – In development (Shimmick/Atlas) Approved
g. UHCS-SHP – In development (Shimmick/Atlas) Approved
h. Contaminated Substance Handling Plan – (Shimmick/Atlas)
i. EMP (Shimmick/Encore) Spec 01-35-43.13
j. Discharge surface water plan (Shimmick/Encore/Watertectonics)
2. Open TESC Items
a. Shimmick ordering extra BMPs to keep on site. Complete
b. Looking at containment options for the chemicals in the hazardous materials
cabinet. Complete
3. Upcoming Schedule
a. Silt fence and asphalt berm – planned for week of 2/16
b. Tree protection – planned for week of 2/16 Pending Approved Submittal
c. Water treatment mobilization – planned for week of 2/16
d. Dewatering well installation to follow treatment system setup Need approved
submittal
4. Open Items
a. Rain expected on Friday, will inspect to prepare for discharge controls.
b. Eric Storkerson: How will sampling occur for discharge through the treatment
system and will this data be used for the DMR?
i. Response: Discharge data for pH and turbidity will be ran from the
treatment system and use for the DMR.
c. Eric Storkerson: How will the carbon be monitored to ensure it’s working e`ectively
and we don’t risk discharging contaminants?
i. Response: The water to the carbon vessels will be under 10 NTU, if the
turbidity is above 10 it will recirculate back to the pre-treatment tanks. Plan
for maintenance activities, checking sediment levels in tanks, and checking
2
media integrity is being developed and will be performed by Encore,
Shimmick, and Watertectonics.
d. Contaminated handling process meeting with Sound Transit, Shimmick, Atlas and
Encore at 9:00am 02/13/26.
5. CESCL Inspection
a. SW corner of the site has been cleaned up and straw mulch placed over the soil in
the planter.
b. The ponding at the South end of the site was sampled for turbidity at 20.5 NTU and
will be allowed to discharge.
c. .25” rain expected Friday mid-day into the evening. A temporary water
handling/discharge plan is in place to get through the rain events that occur prior to
the storage tanks arriving and is as follows:
i. Plug all open catch basins with plastic and allow to pond.
ii. Sample the ponding areas and allow to discharge if under 25 NTU.
iii. If sampling results are over 25 NTU the water will be pumped with 2”
submersible pump to the gravel area in the middle of the site.
iv. through the weekend as long as there is no additional rain anticipated. If
additional rain comes in daily sampling will be performed.
v. The area where ponds are over 25 NTU will continue to be pumped to the
middle of the site and will be monitored over the weekend by Shimmick.
d. Southern side of the site has been swept.
e. Secondary containments in place under small engines on water bu`alo and air
compressor.
SW corner cleaned up and mulch applied
3
Southern part of the site swept Ponding from plugged CB (DP-01) - 20.5 NTU
Turbidity result for discharge to CB (DP-01) Drain MH lid broken, block with plastic
4
CB in NW area of site needs insert and plastic Gravel pile covered
Shimmick plans to install HMA berm along this driveway
5
Old spill cleaned up Containments in place