HomeMy WebLinkAbout5829 W 29th AvenueNovember 17, 2017
SDG Incorporated
333 West Hampden Avenue
Suite 700
Englewood, CO 80110-2337
(303) 781-7070 Fax: 781-4286
City of Wheat Ridge — Building Department
Attn.: Mr. Brian Tardif — Chief Building Official
7200 W. 29m Avenue
Wheat Ridge, Colorado 80033
Re: On -Site Structural Observations
Denver Water - Ashland Reservoir Tank Replacements, Wheat Ridge, Colorado
SDG Reference No. 10004.0-P3
Mr. Tardif:
The structural designs for the above referenced project as shown on Drawings S-1 through S-39
March
2011 and issued Final for Construction on February
October is wed (Drawings Construction
S-7 and Fe �' 13, 2013 with revisions by Work Change Direct ve on
2014 (Drawings S-30 and S-31) and September 14, 2015 (Draarch 4, 2014 wings S-28 S-3 and and
a
Drawing S-40 dated June 2013 and added by Work Change Directive on September 14 )' March 6,
S-41 through 5-43 dated June 2013 and issued Final for Construction on October3)' and as shown on
Supplemental Drawings SS -1 and SS -2 dated July 8, 2013; and on Supplemental° 2015 and on Drawings
26, 2016; and S shown on
September 15, 2015 were prepared by SDG Incorporated and were modified b
Change Directives under the supervision of the undersigned Drawing SS -4 dated
structures were completed b G Y RFIs and the noted Work
Y Gamey Construction and Whitest ne Construction Services, Inc. under contract
ruction of the
With Western Summit Constructors, Inc. of Englewood, Colorado who performed construction man
the project. We understand that Western Summit Constructors, Inc. has received a permit for this
the City of Wheat Ridge. agement for
s work from
SDG Incorporated reviewed the contractor's submittals of concrete mix designs; shopdraw'
reinforcing steel, post -tensioning steel, and fiberglass stairs; hatch submittals; and other mi
structural products submittals. Site visits were also made by Tom ch sub , John Pec Ings for the
SDG Incorporated to provide observations of reinforcing steel and Post -tensioning steel miscellaneous
Peck or Gene Schaefer e
Primary concrete placements, and at several other critical times as noted on the attached TLst of Fide
Observations. These site visits were made on the dates indicated on the attached List of Field Observations.
eld
These observations were made under the limitations imposed by the status of ulipl
corrections were pointed out to the contractor on each occasion and it was agreed by the Game Cons
construction. Multiple
and Western Summit Constructors, Inc. representatives that these corrections would be made
concrete placements or the next stage of construction. Many of the corrections were observedY Construction
the individual concrete placements or the next stage of construction. Prior to the
by SDG prior to
C"
Consulting Structural Engineers
To the best of our knowledge, based on these on-site observations, we believe that the reinforcing steel and
post -tensioning steel placements and the other specified structural items were generally constructed in
conformance with the above noted structural drawings and the related technical specifications. Please contact
us if there are any questions.
Sincerely,
SDG Incorporated
Eugene M. Schaefer, PE,
Email Copy Sent to: Martin Garcia — Denver Water
David Wilson — Denver Water
Steve Bosshart — Western Summit Constructors, Inc.
city of
2
(Wheat
Ridge
List of Field Observations
Denver Water — Ashland Reservoir Replacements Project
SDG Incorporated
November 17, 2017
Date
05-09-13
05-14-13
05-15-13
05-16-13
07-30-13
08-20-13
08-23-13
08-29-13:
10-21-13:
10-23-13:
11-13-13:
11-25-13:
12-03-13:
12-11-13:
12-31-13:
01-03-14:
01-14-14:
01-15-14:
01-16-14:
01-17-14:
01-18-14:
01-21-14:
02-25-14:
03-12-14:
03-13-14:
03-17-14:
03-25-14:
03-26-14:
03-27-14:
03-28-14:
04-03-14:
04-04-14:
04-08-14:
04-14-14:
04-15-14:
General Description of Observations Performed
Brief observations of initial demolition of West Basin and related consultations
Brief observations of West Basin demolition activities and related consultations
Brief observations of West Basin demolition activities and related consultations
Brief observations of West Basin demolition activities and related consultations
General site observations during over -excavation for Tank 2
Observations of over -excavation for Tank 2 and groundwater conditions and related meeting
regarding elimination of a portion of the deeper underdrain directly below the tank
Observations of test slab concrete placements at Lakewood storage site and related consultations
Follow-up observations of test slab concrete surface conditions at Lakewood storage site
Observations of reinforcement for inlet/outlet pipe encasement for Tank 2 (1 51 portion)
Observations of reinforcement for inlet/outlet pipe encasement for Tank 2 (211d portion)
Observations of concrete surface conditions of test slabs at Lakewood storage site
Observations and assistance with reviewing subgrade elevations at Tank 2 base slab perimeter
On-site review of Tank 2 base slab subgrade elevations and conditions and reinforcing clarifications
Observations of portions of perimeter thickened slab/wall footing reinforcing for Tank 2 base slab
Observations of reinforcement progress for Tank 2 base slab and related clarifications
Observations of typical reinforcement for west third of center portion of Tank 2 base slab
Observations of portions of reinforcement for perimeter thickened slab for Tank 2
Observations of reinforcement for center typical layout for Tank 2 base slab
Observations of reinforcement at northeast quadrant of Tank 2 base slab, partial pipe penetration
reinforcement and partial perimeter thickened slab/wall footing reinforcement
Observations of reinforcement for Tank 2 base slab prior to concrete placement
Observations and assistance with monitoring during Tank 2 base slab concrete placement
Observations of concrete conditions at edge of Tank 2 base slab and slab moisture for curing
Observation of reinforcing steel for first 6 footings and outlet pipe penetration closure ring
Observations of reinforcement for l st Tank 2 wall segment without a pilaster at the west side of tank
Follow-up observations of reinforcement for 151 Tank 2 wall segment and vertical waterstop areas
Observations of start of concrete placement for 151 wall segment and reinforcing steel for 6 footings
Observations of reinforcement for 2°d Tank 2 wall segment with partial review of Pilaster 6
Observations of reinforcement for Pilaster 6
Observations at beginning of concrete placement for 2nd Tank 2 wall segment
Observations of reinforcement for wall segment located north of segment with Pilaster 6
Observations of reinforcement for wall segment with Pilaster 1, except Pilaster reinforcing
Observations of reinforcement for Pilaster 1
Observations of reinforcement for wall segment between wall segments with Pilasters 1 and 2
Observations of reinforcement for wall segment with Pilaster 5, except Pilaster reinforcing
Observations of reinforcement for Pilaster 5
City of
Wheat Ridge
uilding
q
04-21-14: Observations of reinforcement for north portion of Th wall segment with Pi
laster 2), except Pilaster
04-22-14: Observations of reinforcement for south portion of wall segment with Pilaster 2, except Pilaster
04-23-14: Observations of reinforcement for Pilaster 2
04-25-14: Observations of reinforcement for wall segment between wall segments with Pilasters 4 and 5
04-30-14: Observations of reinforcement for wall segment between wall segments with Pilasters 2 and 3
05-02-14: Observations of concrete finishes and related consultations regarding repairs
05-05-14: Observations of reinforcement for Tank 2 wall segment with Pilaster 4 except Pilaster reinforcing
05-06-14: Follow-up observations of reinforcement -wall segment with Pilaster 4 at overflow pipe penetration
05-06-14: Observations of reinforcement for Tank 2 Pilaster 4
05-14-14: Observations of reinforcement for Tank 2 wall segment with Pilaster 3 except Pilaster reinforcing
05-15-14: Observations of reinforcement for Tank 2 Pilaster 3, pipe saddle and Pilaster 5 monitoring tendons
05-20-14: Observations of reinforcement for Tank 2 wall segment between segments with Pilasters 3 and 4
06-11-14: Observations of Tank 2 Outlet Vault base slab reinforcement
07-02-14: Observations of start of column capital reinforcing steel layout for Tank 2 roof slab
07-23-14: Observations of Tank 2 Outlet Vault wall reinforcement
07-24-14: Follow-up observations of Tank 2 Outlet Vault wall reinforcement
07-15-14: Observations of Tank 2 roof slab reinforcing to clarify steel layout at tops of columns and perimeter
07-28-14: Observations of test slab finishing using Day 1 Finishing Aid
07-28-14: Observations of roof slab perimeter sponge filler and reinforcing steel layout
08-05-14: Observations of Tank 2 roof slab P -T and reinforcing steel at tops of columns for clarifications
08-13-14: Observations and consultations with electrical subcontractor regarding embedded conduits
08-14-14: Observations of Tank 2 roof slab P -T and reinforcing steel
08-15-14: Observations of Tank 2 roof slab P -T and reinforcing steel
08-16-14: Observations of Tank 2 roof slab P -T and reinforcing steel
08-18-14: Observations and assistance with monitoring during Tank 2 roof slab concrete placement
08-20-14: Initial observations of Tank 2 roof slab top surface and edge conditions
09-24-14: Observations of reinforcing steel for Tank 2 Outlet Vault roof slab
09-07-14: Observe condition of 2013 test slabs at Lakewood storage site
10-29-14: Observations of pipe penetration reinforcing steel for Tank 2 base slab blockouts and partial
reinforcing for interior and exterior base of wall curb reinforcing and partial roof hatch reinforcing
12-16-14: Observations of Tank 2 exterior wall surfaces and base of wall joint seepage during water test
12-19-14: Follow-up observations of Tank 2 exterior wall surfaces during water test before draining tank
01-02-15: Final walk-through of interior of Tank 2 and initial punch list notes
01-16-15: Observations of reinforcing steel and dowels for Mark D footing repair
02-06-15: Observations of exterior of Tank 2 wall with tank filled to evaluate remaining leakage
02-10-15: Follow-up observations of Tank 2 exterior wall surfaces to evaluate seepage repairs
03-13-15: Preliminary observations of Tank 2 roof slab conditions
07-15-15: Observations of Tank 1 Outlet Vault base slab and wall dowel reinforcing steel
07-16-15: Follow-up observations of Tank 1 Outlet Vault base slab and wall dowel reinforcing steel
07-30-15: Observations of Tank 1 outlet pipe lower portion of encasement reinforcing steel
07-31-17: Follow-up observations of Tank 1 outlet pipe lower portion of encasement reinforcing steel
08-03-15: Observations of Tank 1 outlet pipe horizontal (first segment) encasement reinforcing steel
08-10-15: Observations of Inlet Structure base slab and wall dowel reinforcing steel
08-11-15: Observations of Tank 1 Outlet Vault wall reinforcing steel
08-14-15: Observations of Tank 1 inlet pipe encasement reinforcing steel
08-17-15: Observations of Tank 1 inlet/outlet pipe encasement reinforcing steel
City of
2
(Wheat Ridge
kui(ding Divison.
-i
08-18-15: Observations of Tank 1 drain pipe encasement reinforcing steel
08-31-15: Observations of Tank 1 water quality monitoring pipe encasement reinforcing steel
09-11-15: Observations of reinforcing steel for lower lift of Inlet Structure walls
09-21-15: Review of subgrade elevations for Tank 1 base slab to help evaluate elevation tolerances
09-29-15: Observations of start of placement of reinforcing steel for perimeter ring beam of Tank 1 base slab
10-15-15: Observations of progress of P -T and reinforcing steel for Tank 1 base slab
11-02-15: Observations of typical P -T and reinforcing steel through west 70% of center of Tank 1 base slab
11-03-15: Observations of typical P -T and reinforcing steel for the central portions of Tank 1 base slab
11-04-15: Observations of pipe penetration trim reinforcing steel for Inlet and Outlet pipes of Tank 1 and
partial review of perimeter ring beam reinforcement and start of seismic cable installations
11-05-15: Observations of perimeter ring beam reinforcing steel and P -T, and seismic cables for Tank 1 slab
11-06-15: Observations of reinforcing steel and P -T for Tank 1 base slab prior to concrete placement
11-07-15: Assistance with monitoring during concrete placement and partial finishing for Tank 1 base slab
12-18-15: Observations of reinforcement for first 6 column footings for Tank 1 and upper portion of Inlet
Structure walls
01-06-16: Observations of base preparations and start of spiral reinforcing for 1st wall segment (w/ Pilaster 3)
01-12-16: Initial observations of a portion of reinforcement for 111 wall segment (with Pilaster 3) of Tank 1
01-13-16: Observations of reinforcement for 1st wall segment (with Pilaster 3) of Tank 1 except pilaster
01-14-16: Observations of reinforcement for first 6 columns of Tank 1 and for Pilaster 3 (of 1st wall segment)
01-20-16: Observations of reinforcement for 2nd wall segment (east wall segment) of Tank 1
01-27-16: Observations of reinforcement for 31 wall segment (with Pilaster 2)
02-02-16: Observations of reinforcement for 4th wall segment (segment between Pilasters 3 and 4) of Tank 1
02-04-16: Follow-up observations for 41h wall segment at the overflow pipe penetration, observe the location
of the electrical conduit in the east wall of the Inlet Vault and one tank column reinforcing
02-09-16: Observations of reinforcement for 51 wall segment (segment between Pilasters 1 and 3) and
reinforcement for Inlet Vault upper lift of wall
02-16-16: Observations of reinforcement for 61 wall segment of Tank 1
02-17-16: Observations of reinforcement for 601 wall segment with Pilaster 1
02-19-16: Observations (partial) of Tank 2 roof slab surface conditions
02-23-16: Observations of reinforcement for Th wall segment
02-24-16: Observations (partial) of Tank 2 roof slab surface conditions and Tank 1 Pilaster 4 reinforcing
02-29-16: Observations of reinforcement for 81h wall segment
03-03-16: Observations of reinforcement for 91h wall segment
03-08-16: Observations of reinforcement for wall segment with Pilaster 6
03-09-16: Observations of monitoring tendons in Pilasters 1 and 4 of Tank 1 to evaluation corrosion level
03-14-16: Observations of reinforcement for wall segment with Pilaster 5
03-15-16: Observations of reinforcement for wall segment
03-22-16: Observations of the bottom surface of the Tank 2 roof slab
04-04-16: Observations of interior conditions of Tank 2 during scheduled maintenance
04-14-16: Observations of Tank 2 roof slab top surface conditions with Sika representative
05-09-16: Observations of some of the Tank 1 roof slab edge form P -T anchors and bearing pad installations
05-13-16: Observations and consultations with VSL re: start of roof slab perimeter anchor zone reinforcing
05-18-16: Observations of Tank 1 Outlet Vault top slab reinforcing steel
05-24-16: Observations of Inlet Vault top slab and curb reinforcing steel
06-02-16: Observations of progress (30%) on Tank 1 roof slab reinforcing steel and post -tensioning (P -T)
06-08-16: Observations of Tank 1 roof slab reinforcing (50%) and consultations with electrician and VSL
city of
Wheat Ridge
06-14-16: Observations of P -T and reinforcing steel (70% level) for Tank 1 roof slab and related clarifications
06-15-16: Observations of P -T and reinforcing steel (80% level) for Tank 1 roof slab
06-16-16: Observations and corrections to Tank 1 roof slab P -T and reinforcing steel (90% level) placements
06-17-16: Observations of P -T and reinforcing steel (100% level) Tank 1 roof slab and related consultations
06-18-16: Observations during the concrete placement for Tank 1 roof slab
08-05-16: Initial review of Tank 1 roof slab conditions
08-12-16: Observations of reinforcing steel for pipe penetration closure ring placements for Tankl
08-19-16: Observations of Tank 1 roof slab surface conditions
09-08-16: Observations of Tank 1 exterior wall and perimeter footing during the water tightness test
09-12-16: Follow-up observations of Tank 1 wall surfaces during water tightness test
11-08-16: Observations of Tanks 1 and 2 roof slab top surface repairs
4 \
city Of
wheat,,,.
i CITY OF WHEAT RIDGE
Building Inspection Division
(303) 234-5933 Inspection line
(303) 235-2855 Office • (303) 237-8929 Fax
INSPECTION NOTICE
Inspection Type: EF 1/
Job Address: 6 W
Permit Number: Wol3nao qq
erl
❑ No one available for inspection: Time AM/PM
Re -Inspection required: Yes N
When corrections have been made, call for re -inspection at 303-234-5933
Date:01,0 7 Inspector: M T1
DO NOT REMOVE THIS NOTICE