Search

WALORON ENGINEERING & CONSTRUCTION, INC.

To: William Keating, P.E., Project Engineer, Nashua Wastewater Treatment Facility
From: Jeremy P. Smith, P.E., Project Manager, Waldron Engineering & Construction,
Inc.
Date: October 1, 2019
Re: Change Order Request Review 007
NWWTE Energy Recovery Upgrade Project
Attachments: Methuen Construction PCO #007
WEC]I Field Report 09/30/2019
Mr. Keating:

Waldron has compiled its review based on review of the Owner's documentation (design
documents, OEM submittals, submittal reviews, RFI responses, project notes and meetings

minutes) and the Contractor’s documentation (RFI's,

Submittals, Reports, issued Change Orders).

Specifically, Waldron has reviewed the issue of additional work associated with removal and

relocation of existing electric
the locations of the new foundations for the engine support
required demo, rerouting, and rep
relocated as well as repair of any 0

al conduit that was discovered in the Energy Recovery building in
frame. The scope will include all
owering of all affected conduit that will be required to be
ther conduit that will remain which was damaged during.

cutting of interior CMU wall and slab performed either by Methuen or their subcontractor as

applicable.

Summary Review

Original Schedule Schedule Direct Schedule Schedule Claim
Adjustment claim Impact Assessment Recommended
None none wa 0 days
Original Cost Cost Adjustment Direct Cost lmpact Cost Adjustment
claim Assessment Recommended
None Nat to Exceed Not to Exceed Not to Exceed
$10,710.00 $10,710.00 $16,710.00

Detailed Review-Base Cost. Validity

Methuen has made a claim for the time and materials work not to exceed the amount stated as
described above based on review by Methuen and Waldron on site and described in the
September 30, 2019 WECTI field report. The claim is based on their work and their
subcontractor’s work resulting from the above.

Full detailed review of request was not complete due to the unknown extent of conduit and wiring

that requires replacement, Waldron request

s that once extent of work is known or following

completion of work, Methuen shall submit record of time spent and total linear feet of conduit

S7 INDUSTRIAL DRIVE SUITEG-1 EXETER, NHO3e8a3 (603)772 7153

WALDRON COM

and wiring used during work. Waldron will use this information to confirm cost validity of the

scope of work completed,
Detailed Review-Schedul
Methuen did not make a claim for schedule adjustment and as such no review was conducted.
Original Schedule Schedule Direct Schedule Schedule Claim
Adjustment claim impact Assessment Recommended
None none n/a 0 days
Conclusion

Waldron has reviewed all the available information, and has taken into consideration the factors
surrounding the issues in question. Waldron takes no exception to costs and schedule relief as
submitted.

Thus, Waldron recommends approving the Time and Material Not to Exceed $10,710.00 of the
claim as noted above and approving 0 days of schedule relief.

If you have any questions on the above, please don’t hesitate to contact me at 603-772-7153 x
105 or jsmith@waldron.com

Sincerely
Waldron Engineering & Construction, Inc.

Joreeey PB. Stehta

Jeremy P. Smith, P.B.
Project Manager

Doc #: PCO RO 007
: Ref. Document:
OJECT NAME: Date: {-Oct-19

Na

PR

Nashua Energy Rercovery Upgrade
PROJECT NO: 181012
PHASE
COST SUMMARY SHEET
TITLE
A MC Labor (Recap Sheet): $0.00 |
B MC Materials, & Equipment (Recap Sheet): $0.00
¢ MC Fes (A x 15%) + (B x 10%): $0.00 |}
D Subtotal MC Work (A+B +C): | $ -
E Total Subcontractars (Below): $10,000.00
F MC Mark-up on Subcontractor Work (5%): $ 500.00
| GS Bond (1%) and Genera! Liability (1%): $210.00
Total Proposal (D+#E+F+G): & 40,710.00

———————

SUBCONTRACTOR SUMMARY

Amount

Relocate Conduit for Gen Foundation 10,000.00

$
$
$
$
$
$
§
$

Total Subcontractors: 10,000.00

TITLE

Scope: The balow price ts the oust Incurred lo repalr the water seal on miker DS. The Seal was found to be damaged, and SESD asked MOIS tc repair the seal prior te
assembling the new mixer shefi. Accass was installed to the area, the ploce was preparred for welding, and welding was performed par the instructions of SESD in

rasponss to RFIOO7.
41-LABOR
CATEGORY HRS RATE/HR PREMIUM SUBTOTAL LINE TOTAL TOTAL
60
$0.00
i2-MATERIALS
DESCRIPTION QTy UNIT UNIT COST SUBTOTAL
Estimated
Consumables $ 500,00 §$ 500.00 $ -
Dumpster / Disposal + 750.00 $ 750.00 § -
| { _|
SUBTOTAL $ -
2-EQUIPMENT
CATEGORY HRS RATE UNIT SUBTOTAL
VATOR PC300
T 336
OR 320
SUBTOTAL $0,00

Page 2 of 3 10/1/2015 - 8:35 AM

TITLE

Seopa: The below price is the cost Incurred to repalr the water seal on mixer DS. The Seal was found to be damaged, and SESD asked MCIS to repalr the seal prior to
assembling the new mixer shefi. Accens was instellad to the grea, the pleca was preparred for welding, and welding was performed par the Instructions of SESD In

rasponse to RFIOO?.

4-SUPPLEMENTAL COSTS
DESCRIPTION ary RATE UNIT SUBTOTAL
t

SUBTOTAL $0.00

ig-BURDEN
CATEGORY RATE

BURDEN RATE 34.00% $0.00
free WORK TOTAL

SUBTOTAL (Item 1424344) $0.00
A
7-SUBCONTRACTORS WORK

SUBCONTRACTOR UNIT COST Qty COST TOTAL
to

SUBTOTAL $10,000.00
B-FEE

GO (15% X Hams 14.5 + 10% XM tems 26364 + 696 X em 7} $500.00
Is-SUBTOTAL $10,500.00

BOND {1% X Hem®) $105.00

GENERAL LIABILITY (1% X item 8) $105.00
prore. {tem 8 + Bond + Genera! Liability} $10,710.00

Page 3 0f3 10/1/2015: 8:35 AM

ey wi nla cre Pic | Lida ate bh Gabbe
Elected cal 397 Whittier Highway 9308 American Legion Hwy
Moultonbeora, NH 03254 Westport, MA 02790
installations. 1 Ine. 603-253-4525 568-636-9600
Tee Meclawiew, NE FAX 603-253-6284 FAX 508-636-8650

September 30, 2019

To: Don Hutchinson

Methuen Construction

Energy Recovery Project Time and (Viaterials work

Remove in slab conduit and wire located in two square holes in generator room floor for new
support post. Remove in wall conduit and wire for two support beams for new generator. Remove
two %” PVC conduits and wires for new support beam on outside wall.

Install new surface conduit and wire to replace all conduit and wire that has been removed per
demo of the above description.

This work will be fogged in on a daily sheet and a copy will be given to Methuen Construction at the
end of each day’s work.

The Time and materials work will not exceed the amount of $10,000.00

lf any additional work Is required beyond what is described above addition approval will be
requested by the City.

if you have any questions or need more information please feel free to call.

Sincerely,
Charles L. Fritz, Jr.
VWieotebgsident

GY f.

WALDRON ENGINEERING & CONSTRUCTION INC.

FIELD REPORT
PROJECT NAME: | NWWTF ERU PROJECT NUMBER: | 359.01 DATE: | 9/30/2019
ARRIVAL | 0830 ETE TURE | 0930 PREPARED BY: M. Chadwick
Personnel on Site:

e¢ Mat Chadwick (Waldron)
e Don Hutchinson (Methuen)
e Bill Keating (NWTF)

Activities:

Waldron arrived on site at 0830 and met with Methuen at the Methuen trailer then proceeded to the Energy
Recovery Building to review items, NWTF met at the Energy Recovery Building.

The field review was to investigate electrical conduit discover in the slab and the internal CMU walls following
the start of the work done for the revised engine pad design captured in ECN-002. The following is a summary
of the conclusions of the field review. See Figure 1 for a snip from drawing S-1401 keying each of the impacted
locations:

l
6-4" NW 14") tid" WE
— (N} W8X18 —\———
= — — — — .———4
CALLED i 1 /
NORTH | '
13-0 14"l] 4-10 V8"
l [
I 1
1 1
Hk
a el) gh :
3 6 | iil -
= | =|!
1 al
z Zz
sw = SH
i I
1 i .
{ | PE
Ss :
(N) W8X18 +7
3 2" =
yg? 41-5 1a"
Figure 1: Location Key

Page 1 of 4

NW. tion:

Two holes were cut in the existing slab at this location and existing conduit was discovered, see Picture |
below. One of the two hole will be used to create a new engine foundation and the other will be recast with
concrete, One of the holes was cut in the location shown in ECN-002 drawing S-1401 (left) and the other (right)
was cut in the slab to the east at the request of NWTF in an effort to move the foundation and engine frame out
of the access aisle and reduce the potential of.a tripping hazard.

In the case of either hole being used for the foundation, the hole that will be used for the foundation will require
all conduit to be removed and rerouted as required and the hole not used for the foundation will require all
existing conduit be repaired and/or be removed and relocated prior to being recast with concrete.

In the case of the “right” hole to be used for the engine foundation, all conduit must be removed as discussed
above as well as there is expected to be a ductile iron drain line that will require protection. To protect the drain
line from forces transmitted through new engine foundation, the hole should be excavated down past the
minimum required depth as stated on S-1201 to expose the drain line. See Detail | below showing how to
protect the drain line. After the detail is constructed around drain, the hole can be backfilled and compacted to
the minimum depth shown on S-1201 and the remaining can be cast as shown in the original detail on 5-1201 or
the drain with protection and the entire hole can be reinforced and cast.

In addition, the “right” hole can be extended south approximately 4” to avoid additional conduit in NE wall
penetration. See further detail below.

Estimated location of
existing 4 drain line

Page 2 of 4

(Nj) CONCRETE FOUNDATION
(E} PIPE TO REMAIN

(N) 3/8" BENT PLATE OR
2 J SPLIT HSS
=

Detail 1: Typical Pipe Reinforcement

WE Location:

The hole was cut in the existing CMU wall as shown on S-1401 and existing conduit was discovered, see
Picture 2 below, The conduit in the future location of the steel shall be removed and relocated.

It was determined that if the steel for the engine foundation was shifted to the south side of the penetration, as
shown in Picture 2, One (1) existing steel conduit can be avoided, see highlighted. Any other conduit should be
repaired if damaged and then can be cast in the wall with the new steel shape in accordance to the detail on S-
1401. This would require the “right” foundation at the NW location, see above, to extend to the south
approximately 4 inches to allow for the steel shape centerline to land on the centerline of the new foundation.

Existing steel
conduit

Estimated shifted
location of new sicel

Picture 2; NE wall penetration

Page 3 of 4

SW Location:

The hole was cut in the existing slab in the location as shown on S-1201, see Picture 3 below. Conduit was
found in the slab. All conduit remaining or that was damaged during removal of slab shall be removed and
rerouted as required.

Picture 3: SW Foundation

SE Location:

The hole was cut in existing CMU interior wall as shown on S-1401, See picture below. Based on the centerline
of the SW foundation, the new steel in this wall penetration should avoid existing conduit. Any conduit that was
damaged shall be repaired and/or removed and relocated. Remaining conduit and new steel for engine
foundation shall be cast into wall as shown on S-1401.

Estimated location of
new steel shape

fate See

Picture 4: SE wall penetration

ede

Page 4 of 4