Taylor Substation – Civil Construction - Tacomacms.cityoftacoma.org/Purchasing/FormalBids/PG17-0059F Addendum_… · Taylor Substation – Civil ... H126P007 Taylor Substation Structural

CITY OF TACOMA Department of Public Utilities – Tacoma Power

ADDENDUM NO. 1 DATE: May 19, 2017 REVISIONS TO: Request for Bids Specification No. PG17-0059F Taylor Substation – Civil Construction NOTICE TO ALL BIDDERS: This addendum is issued to clarify, revise, add to or delete from, the original specification documents for the above project. This addendum, as integrated with the original specification documents, shall form the specification documents. The noted revisions shall take precedence over previously issued specification documents and shall become part of this contract. REVISIONS TO THE SUBMITTAL DEADLINE: The submittal deadline remains the same – June 6, 2017 – 11:00 a.m. PST. REVISIONS TO THE PROPOSAL PAGES: Replace Proposal Page 3 with revised page: Increase to Bid Item 5d quantity. ADDITIONS TO THE APPENDICES: The appendices provided in this addendum are referenced in the original bid specification but were not provided. Insert Prequalified Electrical Contractor Forms: Pre-Qualified Electrical Contractors List, dated 3/22/17. Insert Tacoma Power Standards: Tacoma Power Standards A-SS-0001, A-SS-0003, A-SS-0004, A-SS-0005 A-SS-0007, A-SS-0008, A-UG-1400, C-UG-1100, C-UG-1150, C-UG-1400, C-UG-1500, C-UG-2000. Insert Pollution and Erosion Control Plan: Pollution and Erosion Control Plan (PECP), dated 4/3/17. REVISIONS TO THE PLANS: Replace drawings listed with revised drawings: H126P001 Taylor Substation Cover Sheet & Vicinity Map H126P007 Taylor Substation Structural Notes (Sheet 1) H126P009 Taylor Substation Conduit and Cable Layout Plan & Details H126P010 Taylor Substation Ground System Layout Plan & Details H126P011 Taylor Substation Foundation Plan H126P015 Taylor Substation 32Ft Dead End Structure & Gas Breaker (Multi-Bay) Foundation H126P016 Taylor Substation 32Ft Dead End Structure & P.T. Stand (Multi-Bay) Foundation H126P017 Taylor Substation 32Ft Dead End Structure & P.T. Stand (Single Bay) Foundation

Specification PG17-0059F Addendum No. 1 Page 2

Form No. SPEC-220A Revised: 08/10/2011

H126P018 Taylor Substation Bus Support Foundations H126P026 Taylor Substation 32Ft Dead End Structure Columns H126P030 Taylor Substation Metering & Disconnect Assembly H126P031 Taylor Substation 115KV Potential Transformer Stand Structure

NOTE: Acknowledge receipt of this addendum by initialing the corresponding space as indicated on the signature page. Vendors who have already submitted their bid/proposal may contact the Purchasing Division at 253-502-8468 and request return of their bid/proposal for acknowledgment and re-submittal. Or, a letter acknowledging receipt of this addendum may be submitted in an envelope marked Request for Bids Specification No. PG17-0059F Addendum No. 1. The City reserves the right to reject any and all bids, including, in certain circumstances, for failure to appropriately acknowledge this addendum.

Patsy Best, Procurement and Payables Manager Finance/Purchasing Division Cc: Ryan McLaughlin, Generation/Plant Engineering & Construction Svcs Terry Ryan, Generation/Plant Engineering & Construction Svcs

3

(PG17-0059F) Name of Bidder

PROPOSAL

QUANTITY

BID UNIT

UNIT COST

TOTAL COST

ITEM 1 Mobilization/Demobilization LS $____________ ITEM 2 Erosion/Sedimentation Control LS $____________ ITEM 3 Site Grading LS $____________ ITEM 4 Rock Products a. Switch Station Yard Rock 2,000 TON $____________ $____________

b. 5/8-Inch Minus Crushed Surfacing

1000

TON

$____________

$____________

c. 1 1/4 – Inch Minus Crushed Rock

100

TON

$____________

$____________

d. Quarry Spalls 120 TON $____________ $____________

e. Conduit Bedding 200 TON $____________ $____________ ITEM 5 Conduits, Cable Trench, and Vaults a. 1-Inch Diameter Schedule 40 450 LF $____________ $____________

b. 1-1/2 Inch Diameter Schedule 40

320

LF

$____________

$____________

c. 2-Inch Diameter Schedule 80 150 LF $____________ $____________

d. 2-1/2 Inch Diameter Schedule 40

1,300 1,400

LF

$____________

$____________

e. 4-Inch Diameter Schedule 80 240 LF $____________ $____________

f. 6-Inch Diameter Schedule 80 80 LF $____________ $____________

g. Cable Trench 188 LF $____________ $____________

h. Vault 5 EA $____________ $____________ ITEM 6 Grounding Grid LS $____________ $____________ ITEM 7 Grounding Rod LS $____________ $____________

Pre-Qualified Electrical Contractor Forms Page 1 Specification PG17-0059F

PRE-QUALIFIED ELECTRICAL CONTRACTOR FORMS

Burke Electric, LLC DJ's Electrical, Inc. EC Company Henkels & McCoy, Inc. JH Kelly, LLC

Bellevue, WA Brush Prairie, WA Portland, OR Portland, OR Longview, WA

10‐A‐1 X X X X10‐A‐2 X X X X10‐A‐3 X X X10‐B‐1 X10‐B‐2 X10‐B‐3 X10‐B‐4 X X10‐B‐5 X X X10‐B‐6 X X X10‐B‐7 X X X10‐B‐8 X X10‐C‐1 X X10‐C‐2 X10‐C‐310‐C‐4 X X10‐C‐510‐C‐6 X

Pwr Tfrs 10‐D‐1a X X XTap Chng 10‐D‐1b X15kV PCB 10‐D‐1c X X XTran PCB 10‐D‐1d X X XTran Sw 10‐D‐1e X XCntl Wr 10‐D‐2a X X XRelay 10‐D‐2b X X XDA/SCADA 10‐D‐2c X X XSubstation Grounds 10‐D‐3 X X XSubstation Conduit 10‐D‐4 X X XInstallation 10‐E‐1aSplice & Repair 10‐E‐1bInstallation 10‐E‐2a X X XSplice & Repair 10‐E‐2b X X X

10‐E‐3 X X

2017 Tacoma Power Prequalified Electrical Contractors List

Civil WorkConduit/VaultExcavationRd Xings

UG CableCable TermPM TfmrsEmer UG

Electrical Transmission (52,000‐230,000 V)

Wood PoleSteel LatticeSteel PoleStringingLong Span

Electrical Distribution (2400‐15,000 V)

OH LinesNew OHTfmrsEmer OH

Emer Work

Electrical Substation

Installation, Testing & Repair

Control Wiring & Metering

Secondary (0‐600 V)

Residential

Commercial

Emergency

Revision Date ‐ 3/22/2017

10‐A‐110‐A‐210‐A‐310‐B‐110‐B‐210‐B‐310‐B‐410‐B‐510‐B‐610‐B‐710‐B‐810‐C‐110‐C‐210‐C‐310‐C‐410‐C‐510‐C‐6

Pwr Tfrs 10‐D‐1aTap Chng 10‐D‐1b15kV PCB 10‐D‐1cTran PCB 10‐D‐1dTran Sw 10‐D‐1eCntl Wr 10‐D‐2aRelay 10‐D‐2bDA/SCADA 10‐D‐2cSubstation Grounds 10‐D‐3Substation Conduit 10‐D‐4Installation 10‐E‐1aSplice & Repair 10‐E‐1bInstallation 10‐E‐2aSplice & Repair 10‐E‐2b

10‐E‐3








Emer Work





Residential

Commercial

Emergency

Magnum Power, LLC MB Electric, LLC Michels Corporation Moza Construction, Inc. Northwest Cascade, Inc.

La Center, WA Lacey, WA Neenah, WI Tacoma, WA Puyallup, WA

X X X X XX X X XX X X XX X XX X XX X XX X XX X XX X XX X XX X XX X XX X XX X XX X XX X XX X XX XX XX XX XX XX X XX X XX X XX X XX X XX X XX X XX X X XX X X XX X X




10‐E‐3








Emer Work





Residential

Commercial

Emergency

Northwest Utility Services, LLC.

PAR, Electrical Contractors, Inc.

Potelco, Inc. Salish Construction Co. Sturgeon Electric

Sumner, WA Hubbard, OR Sumner, WA Tacoma, WA Troutdale, OR

X X X X XX X X X

X XX X X X XX X X X XX X X X XX X X X XX X X X XX X X X XX X X X XX X X X X

X X X XX X XX X XX X X XX X XX X XX X XX X X

X XX X XX X XX X XX X XX X XX X XX X X

X X X X XX X X X XX X X X XX X X X XX X X X




10‐E‐3








Emer Work





Residential

Commercial

Emergency

Wilson Construction Company

Canby, OR

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX


Tacoma Power Standards Page 1 Specification PG17-0059F

TACOMA POWER STANDARDS

Standards in Specification PG17-0059F

The Material ID Numbers (MID#s) listed in Tacoma Power Transmission and Distribution Standards are Tacoma Power’s internal identification numbers for parts and materials. When possible, manufacturers and manufacturer part numbers have been listed in the standard for contractors to identify the material required. If no manufacturer/part number is listed in the standard, a description of the MID# material has been added following the standard to assist contractors.

Grounding,

Substations, Ground Mat

September 18, 2012

A-SS-0001

Transmission & Distribution Standards Page 1 of 2

Application Substation ground mat construction.

Figure A Typical Substation Ground Mat

Construction Notes

1. See Figure A above for typical arrangement of ground mat. The engineer will specify wire sizes, spacing, ground rod locations, etc.

2. All below-grade grounding connectors used in substations must be irreversible compression type and must meet all I.E.E.E. 837 requirements.

3. Unless noted otherwise, distribution and industrial substation ground mat conductors shall be 4/0 7-strand MHD bare copper (MID# 22317).

4. Unless noted otherwise, transmission and generation substation ground mat conductors shall be 300 kcmil 19-strand MHD bare copper (MID# 22329).

5. Clean ground wire before making connections. 6. For connectors requiring multiple crimps, crimp center first, then the ends. 7. All equipment ground connections shall be parallel or cross connection.

Fence connections may use one (1) parallel connector.

Connector Table

Wire Size Wire Size Type Burndy Connector

T&B Connector MID# Y750 Tool Die

(No. Crimps, See Note 6) 4/0 4/0 Cross YGL29C29 54875L 41111 U997 (1) 4/0 4/0 Parallel YGHC29C29 CTP250250 41113 U997 (1) 4/0 300 kcmil Cross YGL34C29 54895L 41110 U997 (1) & PU998 (1)

300 kcmil 300 kcmil Cross YGL34C34 54900L 41112 U1011 (3) 300 kcmil 300 kcmil Parallel YGHC34C34 CTP500500 41130 U1011 (3)

2-Hole Pad 4/0 Plate YGF292N GP22502 60318 U997 (1)

Grounding,

Substations, Ground Mat

September 18, 2012

A-SS-0001


Substation Yard Rock General Yard course shall consist of clean, tough, and durable fragments of crushed

aggregate from only fractured quarry rock free from an excess of flat, elongated, soft, or disintegrated pieces. It shall be uniform quality and free from rock coated with dirt or other objectionable matter (organic material, metal, or other extraneous material).

Gradation

U.S. Standard Sieve Size Percent Passing (by weight) 1-1/2” 100 1” 60 to 100 3/4" or 5/8” 0 to 35 3/8” 0 to 5

Resistivity The minimum electrical resistivity shall be 3000 ohm-meters when tested in accordance with the Bonneville Power Administration’s ELMM-004 “Rock Resistivity Test Procedure”, dated January 1, 1993.

Approvals Suppliers shall be currently approved for yard rock by Puget Sound Energy. Vendor shall supply current gradation test and resistivity test for approval by Tacoma Power Engineering.

Potential Suppliers

Potential Suppliers that can meet this specification include: Cal Portland White River (Enumclaw, WA) Kennedy (Shelton, WA) Iron Mountain (Granite Falls, WA) Washington Rock Quarry (Orting, WA)

References Puget Sound Energy – Yard Course Crushed Aggregate 1275.1330

(dated 1/12/2010)

A-SS-0001

NO ADDITIONAL MID DATA NEEDED

Grounding,

Substations, Fence Connections

September 25, 2012

A-SS-0003


Application Describes the requirements for grounding substation fences and gates.

Construction Notes

Gates should swing into the station yard only. The full radius of swing shall be over the main grounding grid. If a gate must swing outward, due to restrictions in the station, then the main grounding grid shall extend three feet outward beyond the gate along its entire swing.

All fences adjoining station fences that extend beyond the main grounding grid shall be electrically isolated from the station fence by a section of wood fence, isolation panel, or other approved insulating section, a minimum of 6 feet in length.

Figure 1A Fence Barbed Wire Grounding Material List

Item # Material Material ID Qty a Bolt, Machine, 1/2" x 1-1/4”, Stainless 20633 1 b Washer, Belleville, 1/2", Stainless 21189 1 c Washer, Flat, Round, 1/2", Stainless 21199 1 d Connector, Wire, 4/0 stranded, Terminal Lug, 1-hole 60317 1 e Wire, 4/0 Cu, 7-strand, Bare, MHD 22317 FC f Connector, wire, crimpit, Cu 35272 FC

3 or 6 – Strands Barbed Security Wire

Drill and tap gate post and frame to receive 1/2" machine bolt. Alternate method of drilling through post and add nut & washers is acceptable.

To Ground Mat (See A-SS-0001)

f e

d c b a

d c b a

Grounding,


September 25, 2012

A-SS-0003


Figure 1B Fence Fabric Grounding

(FOR MAINTENANCE OF EXISTING FACILITIES ONLY)

Crimpit Wire Connector MID# 35272 Each copper strand (qty. 7) is connected to a separate wire of the fence fabric Strand is on inside of fence

4/0 Cu 7-Strand Bare MHD MID# 22317


Grounding,


September 25, 2012

A-SS-0003


Figure 2 Fence Post & Gate Grounding Detail

For metal posts, drill and tap gate post and frame to receive 1/2" machine bolt. Alternate method of drilling through post and add nut & washers is acceptable. For concrete posts, use a 1/2" concrete anchor instead of a tapped hole for the fixed connection point.

Material List

Item # Material Material ID Qty a Bolt, Machine, 1/2" x 1-1/4”, Stainless 20633 2 b Washer, Belleville, 1/2", Stainless 21189 2 c Connector, Wire, 2/0 stranded, Terminal Lug, 1-hole 35311 2 d Connector, Wire, 4/0 stranded, Terminal Lug, 1-hole 60317 1 e Braid, Tinned Copper, 195 Amps (for gate only) 34571 18in f Wire, 4/0 Cu, 7-strand, Bare, MHD 22317 FC g Washer, Flat, Round, 1/2", Stainless 21199 2

All Fence Posts in the Substation

Shall be Grounded

Grounding,


September 25, 2012

A-SS-0003


Figure 3 Fence Isolation Panel Detail

References

T&D Construction Standard o A-SS-0001 Grounding, Substations, Ground Mat

NESC Section 092E NESC Interpretations: IR528, IR539 Milwaukee Substation Drawing H121P006 “Grading Section and Details”,

“Fence Isolation Panel” Detail

2” CLR.

Detail Typical Insulator

Substation Fence Post Adjacent

Fence Post

6’-0” Min.

Adjacent Fence

Substation Fence

Fabricate Fence Panel per the Chainlink Fence Specifications

A-SS-0003

MID #20633

SCREW, CAP, HEX HEAD, STAINLESS STEEL, 1/2 – 13 X 1 – 1/4 IN LOGN. MUST MEET ALL APPLICABLE ASTM, ANSI AND ASME STANDARDS FOR THE #316 ALLOY IN GROUP 2. F593G CODING ACCEPTABLE FOR 316 ALLOY

MID #21189

WASHER, BELLEVILLE, 301 STAINLESS STEEL. 1 – 1/8 IN DIAMETER, 1/8 IN THICK, FOR USE WITH ½ IN MACHINE SCREW. MUST MEET ALL APPLICABLE ASTM, ANSI AND ASME STANDARDS. WASHERS MUST BE 1/8 IN THICK. ****NOT ACCEPTABLE: CULLY #409255****

MID #21199

WASHER, FLAT, ROUND STAINLESS STEEL. ½ IN, 1-1/4 IN DIAMETER. MUST MEET ALL APPLICABLE ASTM, ANSI, AND ASME STANDARDS FOR THE #316 ALLOY IN GROUP 2. F593G CODING ACCEPABLE FOR 316 ALLOY.

MID #22317

WIRE, 4/0 COPPER, 7-STRAND, BARE, MEDIUM HARD DRAWN.

MID #34571

BRAID, COPPER, STRANDED,

CONTINENTAL CORDAGE – 252

CONNER WIRE – NE243230T

MID #35272

CONNECTOR, WIRE, CRIMPET

BURNDY – YC4C6

HOMAC - CC46

MID #35311

TERMINAL LUG, 2/0 STRANDED ALUMINUM OR COPPER, 1 – HOLE COMPRESSION TYPE, ½ IN STUD SIZE.

BURNDY – YA26A1

MID #60317

TERMINAL LUG 4/0 STRANDED CU, 1-HOLE COMPRESSION TYPE, ½” STUD SIZE.

BLACKBURN – CTL40L-12

BURNDY – YA-28A3

Grounding,

Substations, Switch Ground Mat

June 2, 2005

A-SS-0004


Personnel Ground Safety Mat

A-SS-0004

MID #22318

WIRE, 4/0 COPPER, 19-STRAND, BARE, SOFT DRAWN.

Grounding, Substations,

Metal Structure Connections

September 18, 2012

A-SS-0005


Application Substation grounding of metal structures.

Material List Item # Material Material ID Qty

1 Connector, Terminal Lug, 4/0 Tinned Copper 35334 1 2 Bolt, Machine, 1/2" x 1-3/4” 20635 2 3 Washer, 1/2", Flat, Round, Stainless 21199 4 4 Washer, Belleville, 1/2", Stainless 21189 4 5 Nut, 1/2", Stainless 20308 2 6 Compound, Sealing, Anti-corrosion, T&B Cat.# CP-8 19324 FC 7 Welded-on Ground Pad with Elongated Hole N/A 1 8 Wire, 4/0 Cu, 7-strand, Bare, MHD 22317 FC

Construction Notes

1. Structure fabricator shall provide a grounding plate, as shown in Figure A (item 7), with two (2) 9/16” holes, 1-3/4” on center, with upper hole elongated.

2. Clean galvanized surface or black iron surface of accumulation of dirt and paint. Do NOT remove galvanized surface if it is in good condition. Any rust must be completely removed from contact surface.

3. Where tower is CORTEN, all oxidation must be removed from contact surface. 4. Apply sealing compound (item 6) to contact surfaces, bolts, nuts and washers.

Do NOT wipe off excess compound. 5. NEVER fasten ground wires on both sides of ground pad. If necessary, use

1/4" x 4” copper bar (MID# 39085) to extend pad for more holes. Lugs may be connected on both sides of copper bar.

6. Alternatively, connect wire from other connection points to riser conductor with two parallel connectors per A-SS-0001.

7. Bolt connector (item 1) to grounding plate (item 7) with bolt, nut and washers as shown in Figure B. Compress Belleville washers to approximately 80%.

Figure A - Grounding Detail Figure B - Connection Detail

A-SS-0005

MID #20308

NUT, HEX, STAINLESS STEEL, ½ - 13. MUST MEET ALL APPLICABLE ASTM, ANSI AND ASME STANDARDS FOR THE #316 ALLOY IN GROUP 2. F593G CODING ACCEPTABLE FOR 316 ALLOY.

MID #20635

SCREW, CAP, HEX HEAD, STAINLESS STEEL, ½ - 13 X 1 – ¾ IN LONG. MUST MEET ALL APPLICABLE ASTM, ANSI, AND ASME STANDARDS FOR THE #316 ALLOY IN GROUP 2. F593G CODING ACCEPTABLE FOR 316 ALLOY.

MID #21189


MID #21199


MID #22317


MID #35334

TERMINAL LUG, 4/0 STRANDED COPPER, 2 – HOLE, COMPRESSION TYPE, ½ IN HOLES. ****NOT ACCEPTABLE: ESP #CHL 4/0 BN****

BLACKBURN – LCN-40

PENN UNION – BBLU–4/0-D

BURNDY – YA28-2N

Grounding,

Substations, Equipment Weld-down Steel

June 2, 2005

A-SS-0007


Equipment Weld-down Steel Grounding Detail

A-SS-0007

MID #22317



Miscellaneous Connections

September 18, 2012

A-SS-0008


Application Miscellaneous substation grounding connections.

Figure A Miscellaneous grounding details Ground Rod Detail

Construction Note: Emboss ground rod under connector with UPRECRIMP 34 die.

Foundation Steel Grounding Detail

Rebar Connector Table (See A-SS-0001 for tool dies)

Wire Rebar Burndy T&B MID#

4/0 1/2" YGL29C29 54875L 41111

4/0 5/8” YGL34C29 54895L 41110

4/0 3/4" YGL34C29 54895L 41110

300 kcmil 1/2" YGL34C29 54895L 41110

300 kcmil 5/8” YGL34C34 54900L 41112

300 kcmil 3/4" YGL34C34 54900L 41112


Miscellaneous Connections

September 18, 2012

A-SS-0008


Figure B Grating Grounding

Material List Item # Material Material ID Qty

1

Connector, Terminal Lug, 4/0 Tinned Copper 35334 1 Bolt, Machine, 1/2" x 1-3/4” 20635 2 Washer, 1/2", Flat, Round, Stainless 21199 4 Washer, Belleville, 1/2", Stainless 21189 4 Nut, 1/2", Stainless 20308 2 Compound, Sealing, Anti-corrosion, T&B Cat.# CP-8 19324 FC Welded-on Ground Pad with Elongated Hole N/A 1

2 Wire, 4/0 Cu, 19-strand, Bare 22318 8

1

2

Bolt connector to ground pad


A-SS-0008

MID #20308

NUT, HEX, STAINLESS STEEL, ½ - 13. MUST MEET ALL APPLICABLE ASTM, ANSI AND ASME STANDARDS FOR THE #316 ALLOY IN GROUP 2. F593G CODING ACCEPTABLE FOR 316 ALLOY.

MID #20635

SCREW, CAP, HEX HEAD, STAINLESS STEEL, ½ - 13 X 1 – ¾ IN LONG. MUST MEET ALL APPLICABLE ASTM, ANSI, AND ASME STANDARDS FOR THE #316 ALLOY IN GROUP 2. F593G CODING ACCEPTABLE FOR 316 ALLOY.

MID #21189


MID #21199


MID #22318

WIRE, 4/0 COPPER, 19-STRAND, BARE, SOFT DRAWN.

MID #35334

TERMINAL LUG, 4/0 STRANDED COPPER, 2 – HOLE, COMPRESSION TYPE, ½ IN HOLES. ****NOT ACCEPTABLE: ESP #CHL 4/0 BN****

BLACKBURN – LCN-40

PENN UNION – BBLU–4/0-D

BURNDY – YA28-2N

Conduit Applications

October 7, 2008

A-UG-1400


Scope This standard provides the size and type of conduit to be used with different underground cables. Conduit sizes are usually determined by two factors, percentage of fill and jam ratio.

Conduit Specifications Type Nominal

Size MID# ID Average (inches)

OD Average (inches)

Weight (per 100’)

SCH 40 1¼” 19336 1.36 1.66 46 lbs SCH 40 2” 19338 2.04 2.38 73 lbs SCH 40 2½” 19340 2.44 2.88 120 lbs SCH 40 4” 19343 3.99 4.50 230 lbs SCH 40 5” 19344 5.01 5.56 320 lbs SCH 40 6” 41890 6.07 6.63 366 lbs SCH 80 2½” 19341 2.28 2.88 150 lbs SCH 80 4” 19354 3.77 4.50 290 lbs SCH 80 5” 19345 4.76 5.56 400 lbs SCH 80 6” 41891 5.76 6.63 550 lbs

Conduit Selection Percentage of

Fill The percentage of fill concerns the cross-sectional area of a particular conduit and the cable(s) in that conduit. It mainly concerns heat dissipation. As a reference, NEC limits fill to 40%. The formula is:

% Fill = 2

2

Dnd x 100

Where D = inside diameter of conduit d = outside diameter of cable(s) n = number of cables

Figure 1

Jam Configuration


October 7, 2008

A-UG-1400


Conduit Selection (continued) Jam Ratio The jam ratio represents the probability that three single cables could

align inside the conduit and become jammed (see Figure 1). Jam ratio becomes critical when bends exist in the conduit run. The formula is:

Jam Ratio = d

D05.1 using the same symbols as % Fill

If the jam ratio is … Then … Larger than 3.0 Jamming is improbable Between 2.8 and 3.0 Serious jamming is possible Between 2.5 and 2.8 Jamming is improbable Less than 2.5 Jamming is impossible

Conduit Application

1Φ Cable(s) 3Φ Cables

Voltage

Size [1]

Conduit % Fill

Jam Ratio

Conduit

% Fill

Jam Ratio

Standard

Sizes

Primary #2 Cu 2½” 20 - 4” 22 3.9 Primary #1/0 Cu 2½” 25 - 4” 27 3.5 Primary 350 Cu [2] - - - 5” 24 [2] 3.8 [4] Primary 750 Cu [2] 6” 23 [2] 3.8 [4]

Secondary #4/0 Al Tpx 2½” 20 3.9 - - - Secondary 250 Al Tpx 2½” 25 3.4 - - - Secondary 350 Al Tpx 4” 12 4.9 - - - Secondary #4/0 Al Qpx - - - 2½” 27 3.9 Secondary 350 Al Qpx - - - 4” 16 4.9 Secondary 500 Cu Qpx [3] - - - 4” 18 4.3

Historic data for network

system [5]

Primary #2 Cu 2½” 59 2.4 Primary 350 Cu [2] - - - 4” 38 [2] 3.0 [4]

Secondary #2 Cu Qpx - - - 2½” 11 6.4 Secondary 250 Cu Qpx - - - 4” 13 5.6 Secondary 350 Cu Qpx - - - 4” 16 4.9

[1] Tpx = triplex (3 wires), Qpx = quadruplex (4 wires) [2] includes #4/0 bare Cu neutral (522 mils) [3] neutral is also 500 kcmil copper [4] #4/0 neutral disregarded in calculation [5] not a current construction standard, historic data for network system note: all calculations based on Schedule 40 conduit:


October 7, 2008

A-UG-1400


Conduit Bends The standard conduit bends are listed below:

Trade Size MID #’s for SCH 40 Bends

2.5" 4" 5" 6” 11˚ Bend 48” Radius 42014

22˚ Bend

18” Radius 19651 24” Radius 19654 36” Radius 19660 48” Radius 42015

45˚ Bend

18” Radius 19650

24” Radius 19655 36” Radius 19657 48” Radius 42016

90˚ Bend

18” Radius 19653 24” Radius 36” Radius 19661 19662 19658 48” Radius 19663 19659 42017 60” Radius 42018

Sidewall Pressure

Sidewall pressure can be reduced by increasing the conduit bend radius.

Sidewall Pressure = 500 lbs maximum for one cable,

1,000 lbs for three cables

= where T is tension (lbs) out of the bend

and R is bend radius in feet.

All bends shall be made to comply with ANSI Standard C80.1-83 and/or ASTM Standards F512, as appropriate.

NOTE: • Rigid galvanized steel bends may be required when pull length or

tension is large • Saddle blocks may be required on some bends depending on soils

and pulling tensions


October 7, 2008

A-UG-1400


Split Conduit & Couplings Split conduits snap together for repairing conduit systems.

Split Conduit

Split Couplings

Size MID#

Split Conduit (10’ lengths)

Conduit Coupling Split to Split

Conduit Coupling Split to PVC

2” 19357 37662 19393 2-1/2” 19358 37663 19394

4” 19359 37664 19395 5” 37660 37665 37661 6” 52201 52200 52059

Bell Ends Conduit runs will normally terminate into a bell end to prevent cable damage.

Conduit Size MID # 2” 18986

2-1/2” 18987 4” 18988 5” 18989 6” 41993

References • ANSI Standard C80.1-83 • ASTM Standards F512 • Okonite Installation Practices for Cable Raceway Systems, 2000 Edition • Cablec Cable Installation Manual, Sixth Edition

A-UG-1400

USE SCHEDULE 40 AND SCHEDULE 80 CONDUIT AND BENDS AS SPECIFIED IN THE STANDARD

Customer Requirements

Conduit Installations

February 24, 2015

C-UG-1100


Application Requirements for underground conduit systems that are installed by a Customer, or

a contractor, that will be owned and maintained by Tacoma Power.

General Underground conduit installations shall be governed by this standard and any

supplemental Tacoma Power specifications. All materials and equipment required for the construction of the conduit system shall be furnished by the Customer, unless specifically stated otherwise in the special conditions of the Letter of Agreement or Tacoma Power Construction Contract Specification.

Inspection • The Customer shall contact the appropriate Tacoma Power Inspector at least

24 hours in advance of beginning construction.

• Construction work performed without prior notice to the Inspector will be subject to rejection.

• Materials or workmanship failing to meet the requirements of this standard will be rejected. Damaged or unacceptable materials shall not be used in the work.

• Materials delivered to the job site shall be subject to inspection by the Inspector.

• If required by the Tacoma Power Inspector, the Customer must remove the rejected material and furnish and install, at Customer's expense, approved material and/or workmanship.

• No work shall be embedded in concrete, backfilled, or covered or concealed until it has been inspected and approved by the Tacoma Power Inspector.

Performance • After conduit installation is complete and final grade is established, the

Customer will be required to prove conduit integrity using a Tacoma Power approved mandrel and with the Tacoma Power Inspector present.

• After swabbing the conduits clean and proving that the conduits are free from debris and obstructions, the Customer shall leave a silicone-coated nylon pull tape, or Tacoma Power approved equivalent, marked in feet and secured at both ends of each conduit.



February 24, 2015

C-UG-1100


Types of Conduit The type of conduit for each application shall be determined by the Tacoma Power

Engineer. The standard acceptable types are: Conduit Type Requirements

PVC UL-listed electrical grade, and gray in color.

• Sch. 40 PVC or Sch. 80 PVC Steel Galvanized Sch. 40 electrical grade steel

Conduit Applications Conduits and encasement provide various levels of protection for cables. This table

lists the different levels and typical applications. The Tacoma Power Engineer will specify which level(s) will be required.

Installation Typical Application

Sch. 40 PVC Standard for direct burial of conduit.

Sch. 80 PVC or

Steel

For areas exposed to the public (such as above ground), where minimum cover is not possible, and/or heavy duty applications. Sch. 80 PVC is preferred. Steel is used if the local permitting jurisdiction requires it.

Sch. 40 PVC Encased in CDF or FTB

Controlled Density Fill (CDF) encasement provides some added protection, and is used:

• For instant compaction when installation time is a factor.

• Local permitting jurisdiction, or third party, requires it.

• Under foundations as required.

Flowable thermal backfill (FTB) offers an increase in cable ampacity; see standard C-UG-2050 “Customer Requirements, Thermal Backfill for UG Power Cable Installations”.

Sch. 40 PVC Encased in Concrete

Rarely used any more, only special conditions such as:

• Where a geotechnical analysis requires it, for example very heavy traffic in poor soils.

• Local permitting jurisdiction, or third party, requires it.

Warning Ribbon

Warning ribbon is installed 12” above the top of the conduit or encasement in those locations where future trenching by other entities is very likely.

Red Dye Encasement

Local permitting jurisdiction, or third party, requires it.



February 24, 2015

C-UG-1100


Conduit Components Elbows • All elbows shall be made to comply with ANSI Standard C80.1-83 and/or ASTM

Standards F512, as appropriate.

• Steel elbows may be required for large pulling tensions.

• Elbow saddle blocks may be required on some bends depending on soils and pulling tensions.

• The minimum radius of elbow used in all conduit installations, unless otherwise specified by the Tacoma Power Engineer, shall be:

Conduit Trade Size 2.5" 4" 5” 6"

Minimum Radius 24" 36" 48” 48"

Type Transitions The most common examples of conduit type transitions are at pole risers.

Sch. 40 PVC to

Sch. 80 PVC

Preferred transition with

Sch. 80 bell end

Alternate transition with Sch. 40 bell end, the sharp edge on the Sch. 80 end must be beveled or filed down.

Sch. 40 PVC to

Steel

Use this adapter when transitioning from PVC to steel

Couplings

Deep socket couplings are required, where the socket depth (L) equals the conduit diameter (D).



February 24, 2015

C-UG-1100


Trenches for Conduit Figure A Typical Trench

General • The trench shall be straight from point to point.

• The bottom of all trenches shall be flat, smooth, uniform, and free of any and all rocks exceeding 2 inches, obstructions, sharp objects, buried timbers and pilings, and other debris encountered.

• Water in the trench shall be removed by pumping or draining as necessary.

Cover over Conduit

• The minimum cover over conduit shall be 36 inches, or the requirement of the local permitting jurisdiction, whichever is greater.

• Total cover is measured vertically from the final grade to the top of the conduit.

• At Tacoma Power Engineer's direction, the burial depth may be more or less than the standard 36 inch depth in order to accommodate installation.

• The Customer is responsible for determining finished grades to assure that minimum burial depth requirements are met after conduit installation.

• For secondary or service conduits, refer to these Customer Requirements standards for cover requirements:

o C-SV-1200 Residential Underground Service Boxes

o C-SV-3200 Commercial Secondary Service

Sloping & Shoring

Trenches shall be prepared according to WAC 296-155 Part N, “Excavation, Trenching, and Shoring”.



February 24, 2015

C-UG-1100


Trenches for Conduit (continued) Bedding and Cover

Select backfill includes the 2 inches of bedding and 3 inches of cover as shown in Figure A.

• No construction debris shall be left in the trench.

• Select backfill material shall be free of rocks exceeding 2 inches, obstructions, sharp objects that could cut the conduit, or any materials that will create pressure points that would crush the conduits during or after the bedding and backfill process.

• If the excavated material is found to be unsuitable for select backfill as determined by the Tacoma Power Inspector, the unsuitable material shall be hauled away and disposed of, and sand or Class B bank run gravel with 100% passing 2 inch screen shall be brought in.

• The select backfill shall be compacted evenly on both sides of the conduit to fill all voids, and shall be placed to prevent damage to the conduit.

• For un-compacted backfill, dome the top of the trench to allow for settlement.

Compaction

Caution!

• Where compaction is required, backfill shall be mechanically tamped to 95% compaction in 6 inch lifts, or to the requirements of the local permitting jurisdiction whichever is greater.

• Backhoe compactors (hoe-pacs) can generate tremendous forces, and should be used only for final compaction. Do not use within 30 inches of conduits to avoid damage.

Restoration and Cleanup

It shall be the Customer's responsibility to restore all areas disturbed by construction back to a condition equal to or better than that which existed before construction.



February 24, 2015

C-UG-1100


Trenches for Conduit (continued) Trenching Near Trees

What to do Where trenching work will be conducted near trees, the trees should be removed. If this is not possible, follow these practices:

For trees measuring less than 20 inches in diameter at 4.5 feet above grade.

• When space allows, trenching will be routed outside the drip line of existing tree(s).

• When tree roots 2 inches in diameter, or larger, are accidentally or unavoidably cut, they will be sawed flush on the tree side of the trench.

• Whenever possible, soil from a trench will be piled on the side of the trench farthest from the tree(s).

412 ft

Drip Line

Drip Line

Under 20"

• Trenches will be back filled in a timely manner and compacted to no more than

their original firmness when possible. • Backfill will be kept clean of trash, chemicals or any other waste or debris.



February 24, 2015

C-UG-1100


Trenches for Conduit (continued) Trenching Near Trees (continued)

Large trees

A large tree is defined as one being 20 inches or greater in diameter measured at 4.5 feet above grade. When trenching near a large tree:

• Tunneling under the tree roots at a depth of at least 36 inches below grade is the preferred method when possible.

• If tunneling is not possible, maintain a minimum distance of 15 feet from the trunk of the tree to the trench.

For more information Contact a Certified Arborist at Tacoma Power.

Conduit Encased in Concrete, CDF or FTB Installed • The conduits shall have a maximum cover of 3 inches in every direction. Anything

higher becomes an underground wall for water or other utilities. There may be exceptions where underground obstructions require a higher limit.

• Where conduit transitions above-grade, the elbow shall be Sch. 80 PVC (or Steel if required by the local permitting jurisdiction).

Spacers and Hold Downs

• Conduit spacers shall be used in all encased conduit applications.

• Conduits and spacer assemblies are to be firmly secured and tied down. Hold down methods shall be used to control floating of conduits during the encasement process.

• The backfill material installed in trenches containing conduit spacers shall not contain rocks that exceed the edge-to-edge separation distance between conduits.

• The minimum space between conduits shall be 2 inches.

• Concrete is to be hand-worked to completely fill all voids between conduits and earth or forms.

412 ft

20" or greater

36"

15'

Tunneling



February 24, 2015

C-UG-1100


Conduit Encased in Concrete, CDF or FTB (continued) Concrete Specification

Concrete for conduit encasement shall be Class “B” (3,000 psi at 28 days- 5 ¾ sack), as specified in Section 6-02.3(2) of the latest revision to the State of Washington Standard Specifications for Road, Bridge, and Municipal Construction. Surfaces upon which concrete is to be placed shall be free of standing water, mud, and debris. Absorptive surfaces against concrete to be placed shall be moistened.

Cold Joint Construction

When it is necessary to make cold joints in the concrete encasement, they shall be made on a uniformly sloping plane at the angle of repose of the fresh concrete and shall be roughened. Before beginning the next pour, the surface of previously placed concrete shall be thoroughly cleaned.

Concrete Reinforcing

• Systems of up to 6 conduits shall be reinforced with a minimum of two No.4 reinforcing bars placed in the bottom of the conduit line.

• All reinforcing bars shall have a minimum concrete cover of 3 inches on the bottom and 2 inches on the sides.

• Special conditions such as extremely heavy wheel loads in soft soils, or conduit lines composed of more than 6 conduits, will necessitate special reinforcing requirements detailed by the Tacoma Power Engineer.

• Reinforcing steel shall be in accordance with the latest revision to the State of Washington Standard Specifications for Road, Bridge, and Municipal Construction, except that reinforcing steel shall conform to the requirements of ASTM Designation A-615, Billet Steel Bars for Concrete Reinforcement, including supplementary requirements 51, Grade 40.

Controlled Density Fill (CDF) Specification

• CDF mix shall consist of Portland cement, water, fine aggregate and, if required by the engineer, accelerating admixtures. The proportions of the CDF shall conform to a mix design that shall be submitted with test results to the engineer for approval.

• CDF shall have a 28 day unconfined compressive strength from a minimum of 50 psi to a maximum of 150 psi and have a consistency that will result in a flowable product at the time of placement which does not require manual means to move it into place. CDF shall have a slump, as tested by ASTM C 43, of not more than 10 inches.

• Fine aggregate shall be sand meeting the requirements of the State of Washington Standard Specifications for Road and Bridge Construction, “Fine Aggregate for Portland Cement Concrete”, 9.03.1(2).

Flowable Thermal Backfill (FTB) Specification

For FTB requirements, see standard C-UG-2050 “Customer Requirements, Thermal Backfill for UG Power Cable Installations”.



February 24, 2015

C-UG-1100


Conduit Installation General • All conduits shall be installed in accordance with the manufacturer's

recommendations. This includes adequate glue and seating ends into couplings or bell ends to their full depth.

• Curves in an otherwise straight conduit run must be approved by Tacoma Power.

• Conduits shall be placed so that they are on firm bearing for the length of the installation and shall be laid on as uniform a slope as possible.

• Provide adequate support on each side of conduit when conduit crosses over another utility, to prevent load transference onto other utilities.

Into Vaults All conduits entering a vault shall follow the requirements of the following standards:

Vault Type See Customer Requirements Standard…

Junction Box C-UG-1500, Primary Junction Box Installation

Transformer Vault C-UG-1700, Transformer Vault Installation

Precast Concrete SSB C-SV-3200, Commercial Secondary Service

Separation from Other Utilities Typical Separation from Tacoma Power conduits and other utilities is detailed in NESC

320.B, “Separation From Other Underground Installations”. Typical separation is a minimum of 12 inches of earth, but lesser distances may be used where the parties agree.

Water Mains Conduits crossing under a water main should have some protection in the event the main breaks.

Ownership All conduits in the right of way will revert to Tacoma Power's ownership after

construction on the site has been completed, inspected, and approved by the Tacoma Power Construction Inspector.

References • National Electric Safety Code (NESC), Section 32, Underground Conduit

Systems

• “Trenching and Tunneling Near Trees: A Field Guide for Qualified Utility Workers” by Dr. James R. Fazio

C-UG-1100



Custom Vault Installations

September 28, 2005

C-UG-1150


Scope This standard details Tacoma Power’s requirements for custom

underground vaults that are constructed and installed by the Customer, but will be owned and maintained by Tacoma Power. All detail design work and system layout drawings are the responsibility of the Customer.

Inspection • After having completed the necessary prior arrangements with

Tacoma Power's Engineering Section, the Customer shall contact Tacoma Power’s Construction Inspector at least 24 hours in advance of beginning construction. Construction work performed without prior notice to the Inspector will be subject to rejection.

• Materials or workmanship failing to meet this Standard's requirements, or any such special requirements, will be rejected. If required by the Inspector, the Customer must remove the rejected material and furnish and install, at Customer's expense, approved material and/or workmanship.

• No work shall be backfilled, embedded in concrete, covered or concealed until it has been inspected and approved by the Inspector.

• Materials delivered to the job site shall be subject to inspection by the Inspector. Damaged or imperfect materials shall not be used in the work.

Vault Requirements Strength Vaults shall be designed to sustain all expected loads that may be

imposed upon the structure including dead load, live load, equipment load, impact, load due to water table, frost, and any other load expected to be imposed upon the structure, to occur adjacent to the structure, or both. This shall include loads imposed by construction at the site. The structure shall sustain the combination of vertical and lateral loading that produces the maximum shear and bending moments in the structure.

Pulling eyes There shall be a pulling eye installed opposite each duct line entering a manhole or vault and in direct line with the cable pull. Pulling eyes shall be installed with a safety factor of 2 based on the expected applied load.



September 28, 2005

C-UG-1150


Vault Requirements (continued) Manhole access

openings

The minimum size of a manhole shall be designated by the Engineer. 1. Round access openings in a manhole containing supply cable shall

not be less than 36 inches in diameter. A 36" x 36" spring loaded diamond plate cover may be used in place of the steel round cover in light-vehicular traffic areas, and approved by the Tacoma Power Engineer.

2. Openings shall be free of protrusions that will injure personnel or prevent a quick exit.

Manhole Covers

1. Manhole covers shall be weighted or designed so they cannot be easily removed without tools.

2. Covers shall be designed to not fall into manholes or protrude into manholes sufficiently far to contact cable or equipment.

3. Cover strength and their supporting structure shall be sufficient to sustain all applied loads.

4. Covers shall have a utility identifying of "TACOMA POWER" in 2" minimum height block letters.

Access Vault or manhole openings shall be located so that safe access can be

provided. When in the highway, they should be located outside of the paved roadway when practical. They should be located outside the area of street intersections and crosswalks whenever practical to reduce the traffic hazards to the people working at these locations. Manholes should be located so they are not directly over cables or equipment. Where these openings interfere with curbs, etc., they can be located over the cable if one of the following is provided:

• A conspicuous warning sign • A protective barrier over the cable • A fixed ladder

Access doors

Where accessible to the public, access doors to utility tunnels and vaults shall be locked unless qualified persons are in attendance. Such doors are provided to prevent entry by unqualified persons. EXCEPTION: This rule does not apply where the only means of locking is by padlock and the latching system is so arranged that the padlock can be closed on the latching system to prevent locking from the outside.



September 28, 2005

C-UG-1150


Vault Requirements (continued) Ladders Fixed ladders shall be corrosion resistant.

Drainage Where drainage is into sewers, suitable traps or other means should be

provided to prevent entrance of sewer gases into manholes, vaults, or tunnels.

Ventilation Adequate ventilation to open air shall be provided for manholes, vaults, and tunnels having an opening into enclosed areas used by the public. In some cases, a forced air system may be required.

Conduit Entrance

Conduit entering a vault will be required to enter at a 90˚ angle to the wall. In no case will a conduit be allowed to enter a structure at other than perpendicular from horizontal or vertical. Standard end bells shall be installed and grouted at each conduit entrance into the structure. Where standard knockout slabs are not available, the Customer will be required to core-drill into the structure.

Typical Installations

Installation consists of the following: 1. Each vault shall be set on a minimum of 9 inches 5/8” crushed rock. 2. A sump of 18 inches in diameter by 24 inches deep inside

dimensions shall be furnished by the Customer. The Customer shall also be responsible for ensuring water-tightness of all structures.

3. The exterior surface of the vault shall be given two coats of dehydatine #4 per Federal Specification SS-A-701, manufactured by A.C. Horne, Inc. Coating shall be applied in accordance with manufacturer's recommendations and shall be cured before backfilling.

4. The Customer shall afford Tacoma Power the option of performing water tests. The cost to remove any water from the structures, if defective, shall be borne by the Customer.

5. The Customer also shall make all necessary repairs of defective structures to make them water-tight at their expense.

6. After a 30-day concrete curing time, the Customer shall paint the interior surfaces of the structures, excluding the floor, with one coat of Parker's Epo Tilt (#9145) or approved equal, and one coat of Kelly-Moore (#1680) Dura-Poxy+ acrylic enamel, or approved equal. All paint shall be applied in accordance with manufacturer's recommendations.



September 28, 2005

C-UG-1150


Scope This standard details Tacoma Power’s requirements for custom

underground vaults that are constructed and installed by the Customer, but will be owned and maintained by Tacoma Power. All detail design work and system layout drawings are the responsibility of the Customer.

Inspection • After having completed the necessary prior arrangements with

Tacoma Power's Engineering Section, the Customer shall contact Tacoma Power’s Construction Inspector at least 24 hours in advance of beginning construction. Construction work performed without prior notice to the Inspector will be subject to rejection.

• Materials or workmanship failing to meet this Standard's requirements, or any such special requirements, will be rejected. If required by the Inspector, the Customer must remove the rejected material and furnish and install, at Customer's expense, approved material and/or workmanship.

• No work shall be backfilled, embedded in concrete, covered or concealed until it has been inspected and approved by the Inspector.

• Materials delivered to the job site shall be subject to inspection by the Inspector. Damaged or imperfect materials shall not be used in the work.

Vault Requirements Strength Vaults shall be designed to sustain all expected loads that may be

imposed upon the structure including dead load, live load, equipment load, impact, load due to water table, frost, and any other load expected to be imposed upon the structure, to occur adjacent to the structure, or both. This shall include loads imposed by construction at the site. The structure shall sustain the combination of vertical and lateral loading that produces the maximum shear and bending moments in the structure.

Pulling eyes There shall be a pulling eye installed opposite each duct line entering a manhole or vault and in direct line with the cable pull. Pulling eyes shall be installed with a safety factor of 2 based on the expected applied load.



September 28, 2005

C-UG-1150


Vault Requirements (continued) Manhole access

openings

The minimum size of a manhole shall be designated by the Engineer. 1. Round access openings in a manhole containing supply cable shall

not be less than 36 inches in diameter. A 36" x 36" spring loaded diamond plate cover may be used in place of the steel round cover in light-vehicular traffic areas, and approved by the Tacoma Power Engineer.

2. Openings shall be free of protrusions that will injure personnel or prevent a quick exit.

Manhole Covers

1. Manhole covers shall be weighted or designed so they cannot be easily removed without tools.

2. Covers shall be designed to not fall into manholes or protrude into manholes sufficiently far to contact cable or equipment.

3. Cover strength and their supporting structure shall be sufficient to sustain all applied loads.

4. Covers shall have a utility identifying of "TACOMA POWER" in 2" minimum height block letters.

Access Vault or manhole openings shall be located so that safe access can be

provided. When in the highway, they should be located outside of the paved roadway when practical. They should be located outside the area of street intersections and crosswalks whenever practical to reduce the traffic hazards to the people working at these locations. Manholes should be located so they are not directly over cables or equipment. Where these openings interfere with curbs, etc., they can be located over the cable if one of the following is provided:

• A conspicuous warning sign • A protective barrier over the cable • A fixed ladder

Access doors

Where accessible to the public, access doors to utility tunnels and vaults shall be locked unless qualified persons are in attendance. Such doors are provided to prevent entry by unqualified persons. EXCEPTION: This rule does not apply where the only means of locking is by padlock and the latching system is so arranged that the padlock can be closed on the latching system to prevent locking from the outside.



September 28, 2005

C-UG-1150


Vault Requirements (continued) Ladders Fixed ladders shall be corrosion resistant.

Drainage Where drainage is into sewers, suitable traps or other means should be

provided to prevent entrance of sewer gases into manholes, vaults, or tunnels.

Ventilation Adequate ventilation to open air shall be provided for manholes, vaults, and tunnels having an opening into enclosed areas used by the public. In some cases, a forced air system may be required.

Conduit Entrance

Conduit entering a vault will be required to enter at a 90˚ angle to the wall. In no case will a conduit be allowed to enter a structure at other than perpendicular from horizontal or vertical. Standard end bells shall be installed and grouted at each conduit entrance into the structure. Where standard knockout slabs are not available, the Customer will be required to core-drill into the structure.

Typical Installations

Installation consists of the following: 1. Each vault shall be set on a minimum of 9 inches 5/8” crushed rock. 2. A sump of 18 inches in diameter by 24 inches deep inside

dimensions shall be furnished by the Customer. The Customer shall also be responsible for ensuring water-tightness of all structures.

3. The exterior surface of the vault shall be given two coats of dehydatine #4 per Federal Specification SS-A-701, manufactured by A.C. Horne, Inc. Coating shall be applied in accordance with manufacturer's recommendations and shall be cured before backfilling.

4. The Customer shall afford Tacoma Power the option of performing water tests. The cost to remove any water from the structures, if defective, shall be borne by the Customer.

5. The Customer also shall make all necessary repairs of defective structures to make them water-tight at their expense.

6. After a 30-day concrete curing time, the Customer shall paint the interior surfaces of the structures, excluding the floor, with one coat of Parker's Epo Tilt (#9145) or approved equal, and one coat of Kelly-Moore (#1680) Dura-Poxy+ acrylic enamel, or approved equal. All paint shall be applied in accordance with manufacturer's recommendations.



September 28, 2005

C-UG-1150


Vault Requirements (continued) Grounding • Vaults that are an integral part of the customer’s building, or buried

under hard surface such as asphalt or concrete, shall have a bare 4/0 Cu wire that extends from the vault ground grid into the trench line a distance of 40 feet.

• Four 1½” plastic sleeves, one at each corner, shall be installed through the floor of vault (except buried type) for the purpose of ground rod insertion. They shall be located a minimum of 6 inches out from each wall and shall protrude through all slabs or footings by 1 inch.

• Grounding shall be as noted below. Figure A Grounding Requirements



September 28, 2005

C-UG-1150


Vault Requirements (continued) Grounding • Vaults that are an integral part of the customer’s building, or buried

under hard surface such as asphalt or concrete, shall have a bare 4/0 Cu wire that extends from the vault ground grid into the trench line a distance of 40 feet.

• Four 1½” plastic sleeves, one at each corner, shall be installed through the floor of vault (except buried type) for the purpose of ground rod insertion. They shall be located a minimum of 6 inches out from each wall and shall protrude through all slabs or footings by 1 inch.

• Grounding shall be as noted below. Figure A Grounding Requirements



September 28, 2005

C-UG-1150


Ownership All conduit, vaults, and equipment in the right of way will revert to Tacoma Power's ownership after all construction on the site has been completed. Customer-provided utility system vault rooms on private property will be owned by the Customer but provided for the exclusive use of Tacoma Power.

Sources N.E.S.C. section 323, “Manholes, Handholes, and Vaults”

Tacoma Power standards: A-UG-011/S630.2201 B-UG-426/S630.2201 B-UG-427/S630.2202 B-UG-409/D5.4002

Customer Requirements Pad-Mount Equipment

Guard Posts Installation

January 2, 2002

C-UG-1400


Scope This standard establishes the requirements for the installation guard

posts around padmounted electrical equipment by the customer.

In This Standard This standard contains the following topics

Topic See Page Scope 1 Application 1 Definitions 2 Responsibilities 2 Inspection Requirements 2 Guard Post Requirements 3 Installation of Guard Posts 5 Placement of Guard Posts 7

Single Phase Transformers 8 Three Phase Transformers 9 Padmounted Switchgear 10 Primary Metering Enclosures 11

Revision Note 11 Effective Date 11

Application Guard posts are installed to protect padmounted electrical equipment

from damage caused by vehicles, trailers, or other motorized devices such as forklifts.



January 2, 2002

C-UG-1400


Terms These are definitions of terms used in this standard

Term Definition

Customer Owner and/or developer responsible for the installation and maintenance of the guard posts.

Equipment Padmounted devices and enclosures such as transformers, switchgear, metering enclosures, secondary pedestals or enclosures, etc.

Responsibilities The responsibilities of installing guard posts are listed below:

Issue Requirement Identifying the placement of guard posts

Tacoma Power Construction Office will determine the location of guard posts.

Installation of guard posts The customer will install the guard posts per this standard under the direction of the Tacoma Power Construction Office.

Maintenance of the guard posts The customer will maintain and replace the guard posts as required.

Inspection Requirements Installation of guard posts is determined by the Tacoma Power

Construction Office. Final placement and installation must be inspected and approved by this office.



January 2, 2002

C-UG-1400


Guard Post Requirements Guard posts required for Residential/Multi-Family applications are

different from Commercial/Switchgear applications. This is due to the size and value of the equipment to be protected and the typical vehicular traffic around it. Refer to Figure #1.

Residential / Multi-Family

The following are the approved guard posts for installations within residential and multi-family areas:

Steel Pipe Concrete

Length 7 feet 7 feet Diameter 6 inches, minimum 8 inches, minimum Construction The pipe shall be

schedule 40 steel and filled with concrete.

Reinforced with rebar cage.

Lifting Eye For removable posts a 1" lifting eye is part of a steel cap.

A 1" lifting hole approximately 8" from the top of the post.

Color Primed and painted Hi-Way Yellow.

Primed and painted Hi-Way Yellow.

Commercial / Switchgear

The following are the approved guard posts for installations within commercial areas and for padmounted switchgear:

Steel Pipe Concrete

Length 8 feet 8 feet Diameter 8 inches, minimum 9 inches, minimum Construction The pipe shall be

schedule 40 steel and filled with concrete.

Reinforced with rebar cage.

Lifting Eye For removable posts a 1" lifting eye is part of a steel cap.

A 1" lifting hole approximately 8" from the top of the post.

Color Primed and painted Hi-Way Yellow.

Primed and painted Hi-Way Yellow.



January 2, 2002

C-UG-1400


Figure #1 Guard Posts

GUARD POSTS

COMMERCIAL

RESIDENTIAL

7'

8'

9"

Sch. 40 Steel (Concrete

Filled)

Concrete Sch. 40 Steel (Concrete

Filled) Concrete

6" 8" min.

8"

Lifting eyes required for removable guard posts



January 2, 2002

C-UG-1400


Installation of Guard Posts The guard posts shall be installed as described below. Refer to Figure

#2 and Figure #3.

Permanent Guard Posts

Guard posts that are permanently installed and will not be removed shall be installed as described and shown below.

Residential Guard posts for residential / multi-family

applications shall be set as follows. Setting Depth Diameter of Concrete

Encasement

42" Steel Concrete 12" 14"

Commercial Guard posts for commercial and switchgear applications shall be set as follows.

Setting Depth Diameter of Concrete Encasement

48" 24" encasement

Figure #2 Guard Post Installation PERMANENT GUARD POSTS

14" Concrete

Posts

42" 24" 48"

Residential Application: Steel vs. Concrete Post Commercial Application:

Steel or Concrete Post

12" Steel Posts



January 2, 2002

C-UG-1400


Removable Guard Posts

The requirements for setting depth and diameter of concrete encasement are the same for removable guard posts as for permanent guard posts. Removable guard posts shall also include a minimum schedule 40 steel sleeve as described below. The sleeves shall allow for easy removal of posts and keep posts vertical in appearance.

Residential Guard post sleeves for residential / multi-family applications shall be as follows:

Length Inside Diameter of Sleeve Steel Post Concrete Post 42" 8" 10"

Commercial Guard post sleeves for commercial and switchgear applications shall be as follows:

Length Inside Diameter of Sleeve Steel Post Concrete Post 48" 10" 11"

Figure #3 Guard Post Installation

REMOVABLE GUARD POSTS

Residential Application

12"

8"

42" 14"

10"

24"

10" or 11"

48"

Commercial Application Steel or Concrete Post

Steel Post Concrete Post



January 2, 2002

C-UG-1400


Placement of Guard Posts General Requirements

The general requirements for the placement of guard posts are described as follows. These requirements are the foundation for the specific installations detailed in this standard. Refer to figure #4. Actual requirements will be specified by the Tacoma Power Construction Office.

Issue Requirement Sides of equipment requiring guard posts

Those sides of equipment adjacent to vehicular traffic or parking.

Maximum spacing between guard posts

72"

Location of guard posts From edge of pad From corner of pad from concrete pad 30" 42" Requirement for removable guard posts

On equipment access sides that allow doors to open 110o.

Figure #4 General Guard Post Placement Requirements

110°

42" 30" 72" Max.

Removable Guard Post

“Keep Clear” Area

Center Between Corner

Posts

Pavement Curb or Edge



January 2, 2002

C-UG-1400


Single Phase Transformers

The placement of guard posts for single phase transformers shall be as shown in Figure #5.

Figure #5 Single phase transformer guard post placement

Three Phase Transformers

The placement of guard posts for three phase transformers shall be as shown below:

kVA of Transformer Figure Number

45 through 300 Figure #6 500 through 750 Figure #7 1000 through 2500 Figure #8

30" 42" Transformer Footprint


Centered between corner posts

Centered between corner

posts



January 2, 2002

C-UG-1400


Figure #6 45 through 300 kVA three phase padmount transformers


30" 42"

Transformer Footprint


58"

30"

64"

42"



78"

78"



January 2, 2002

C-UG-1400



Padmounted Switchgear

The placement of guard posts for padmounted switchgear shall be as shown below. Refer to figure #9

Figure #9 Padmount switchgear

30" 42"



30"

78"

Switchgear Footprint



42"

60"



January 2, 2002

C-UG-1400


Padmounted Metering Enclosures

The placement of guard posts for padmounted metering enclosures shall be as shown below. Refer to figure #10

Figure #10 Padmount metering enclosures



Metering Enclosure Footprint

30"

42"

64"

58"


Primary Junction Box Installation

October 9, 2015

C-UG-1500


Application

Installation requirements of precast concrete junction box vaults and associated conduit installations. All excavation work required by this standard shall conform to the safety requirements of WAC 296-155 Part N (Excavation, Trenching, and Shoring) and any other applicable regulations.

In this Standard

Topic Page Terms 1 Inspection Requirements 1 Vault and Cover Requirements 1 Installation of Vault and Cover 2-3

Foundation and Backfill for Vault 2 Construction Notes 3

Installation of Conduit 4-5 Trench 4 Conduit Size and Type 5 Conduit Entry 5 Conduit Terminations 5

Terms Term Definition

Construction Inspector Representative from Tacoma Power T&D Construction Staff. A pre-construction meeting with the Construction Inspector must happen prior to any construction. Call 253-381-3023.

New Services Engineer Tacoma Power engineering staff that provide design, cost estimates, and coordination of the commercial project.

Inspection Requirements The Construction Inspector will inspect all electrical contractor construction of

primary junction boxes and associated conduit installations.

Vault and Cover Requirements Single Phase Precast Concrete Vault and Cover

Max. of 4 Primary (15kV) Cables

Tacoma Power Vault 444 with Junction Box Cover #2

Vault 4’-0” x 4’-0” x 3’-6”

Cover 4’-0” x 4’-0” x 6”

Three Phase Precast Concrete Vault and Cover

5 to 12 Primary (15kV) Cables

Tacoma Power Vault 554 with Junction Box Cover #3

Vault 4’-8” x 4’-8” x 3’-6”

Cover 4’-8” x 4’-8” x 6”



October 9, 2015

C-UG-1500


Installation of Vault and Cover

Figure 1 Vault Foundation and Backfill Foundation and Backfill for Vault

The foundation shall be prepared as follows, as directed by the Construction Inspector. See Figure 1.

Issue Action

Excavation for Vault The Construction Inspector will direct the excavation requirements.

Vault Foundation Vault foundation shall be minimum of 9 inches of 5/8” minus crushed rock, well compacted, extending a minimum of 12 inches beyond the edge of the vault in all directions.

Backfill Material Clean fill or better as directed by the Construction Inspector.

Compaction at Subgrade

Compaction requirements will be determined by the Construction Inspector.

Final Grade

The elevation difference between the top of the vault cover and final grade shall be:

Type of final surface Difference (inches) Landscaped 6 Paved Surface flush



October 9, 2015

C-UG-1500


Installation of Vault and Cover (continued) Figure 2 Sloping Installations

For junction box vaults installed on a slope, the minimum dimensions for clearances are:

• Front clearance = 8 feet • Side clearance = 8 feet

Construction Notes

• The junction box vault must be kept clear of any obstructions, such as: o fences, mail boxes, rockeries, berms, and vegetation. o bark, sod, ground cover mulch, and rocks, etc., on any part of the

structure. o trees and bushes extending into the clearance area.

• Phone and TV pedestals must be installed behind the vault on back corners as shown above.

• The clearance area grade shall be level and a retaining wall shall be provided when required by the Tacoma Power Engineer.

o A wooden, concrete or rockery wall shall have 1 to 4 maximum allowable slope to the property line.

• Typical structures are located in a utility easement, or on a public right-of-way, not on private property.



October 9, 2015

C-UG-1500


Installation of Conduit

Figure 3 General Conduit Layout Into Vault

Trench The depth of trench and backfill for primary conduit is listed below:

Issue Action

Depth A minimum of 36 inches of cover is required over the primary conduit. With prior approval, exceptions may be granted by the New Services Engineer.

Backfill The trench shall be backfilled with clean fill or better as directed by the Construction Inspector.

VAULTJUNCTION BOX

Left-SideKnockouts

Groutaround

knockouts

Electrical Primary90°

4"

Electrical Primary90°

4" Left-SideKnockouts

Grout aroundknockouts

TOP VIEW

Conduit Termination as Directed by Construction Inspector



October 9, 2015

C-UG-1500


Installation of Conduit (continued) Conduit Size & Type

The conduit shall be installed per the requirements listed below unless otherwise directed by the New Services Engineer:

Issue Action

Size of Conduit Single Phase 2.5 inch

Three Phase 4 inch

Color and Minimum Grade of Acceptable Conduit Gray, Sch. 40 PVC

Conduit Entry Conduit entering the vault shall consistently enter the left side knockouts on all sides. This is for the training of cable in the vault to be in the same direction. The Construction Inspector may approve exceptions on a site-by-site basis only. In any case, all conduit entry into the vault shall allow all cables to be trained in the same clockwise or counter-clockwise direction (see Figure 3).

Conduit Terminations

Conduit shall be terminated as detailed below:

Issue Action

Termination of Conduit Inside the Vault

The conduit into the junction box vault shall:

• be perpendicular to the vault wall.

• extend 4 inches into the vault.

• have bell ends on the conduit ends. Do not glue bell ends.

• be sealed into the vault with grout around the knockouts.

Termination of Conduit “stubs” Beyond the Vault (when required)

The conduit ends shall:

• be terminated 5 feet minimum beyond the vault.

• install conduit coupling and cap prior to backfill in order to prevent the backfill material from entering the conduit.

• be marked with a length of 2.5” Sch. 40 PVC conduit extending vertically a minimum of 4 feet above grade with a “Call Before You Dig” sticker.

C-UG-1500


Customer Requirements Precast Concrete Vaults

Approved Vendors

June 10, 2015

C-UG-2000


Application

List of approved vault vendors and their material identification (MID) numbers for vaults used in Tacoma Power underground construction.

Oldcastle Precast 2808 A Street S.E. Auburn, WA 98002 (800) 892-1538

H2 Pre-Cast Inc. 3835 N. Clemons Street East Wenatchee, WA 98802 (509) 884-6644

Description Tacoma Power MID#

Oldcastle Precast MID# H2 Pre-Cast MID#

233 Base 35057 233-LA VB-TP233 233 Cover (standard) 34669 23-2436 VL-TP233-2436 233 Cover (nonskid) 34671 23-2436-NS VL-TP233-2436SN 233 6in Riser 39828 23R-6 VR-TP233-6 444 Base 21163 444-TPU VB-TP444 444 Transformer Cover #1 19451 44-1228 VL-TP4401228 444 Junction Box Cover #2 (standard) 19447 44-USF-DP VL-TP440-13 444 Junction Box Cover #2 (nonskid) 19449 44-USF-NS VL-TP440-13SN 444 6in Riser 39970 44R-6 VR-TP440-6 444 12in Riser 43252 44R-12 VR-TP440-12 554 Base 21165 504-TPU VB554-TP 554 Transformer Cover #1 (1Φ) 19457 55-1228 TPTP-55-1228 554 Transformer Cover #2 (3Φ) 19459 56-2044 TPTP5666-2044 554 Junction Box Cover #3 (standard) 19453 55-USF-DP VL550-13-TP 554 Junction Box Cover #3 (nonskid) 19455 55-USF-NS VL550-13-TPSN

554 Junction Box Cover #4 (manhole) 64807 55-36 COVER TPU cast in flush BLTP550-36C

554 6in Riser 39972 55R-6 VR-TP550-6 554 12in Riser 43254 55R-12 VR-TP550-12 684 Base 21169 684-BASE VB-TP687 684 Cover (standard)) 63355 684-USF-DP VL-TP687-23 684 Cover (nonskid) 21171 684-USF-NS VL-TP687-23SN 687 Base 39978 687-BASE VB-TP687 687 Cover 63356 687-TOP VT-TP687-02 Manhole Frame/Cover, 36in dia. 20558 36” F&C TPU CCRC36-FC Manhole Cover only, 36in dia. 19426 36” COVER TPU CCRC36-C Manhole 4in Riser, 36in dia. 39976 3606 MAR36-4

Manhole Frame/Cover, 42in dia. 67978 EJCO#00184510 & #00184395

CCRC722-TP-R & CCRC722-TP-C

Manhole Cover only, 42in dia. 67979 EJCO#00184395 CCRC722-TP-C Manhole 4in Riser, 42in dia. 68010 4204 MAR42-4

Customer Requirements Precast Concrete Vaults

Approved Vendors

June 10, 2015

C-UG-2000


Description Tacoma Power MID#

Oldcastle Precast MID# H2 Pre-Cast MID#

774 Base 21167 774-TPU VB774-TP 774 Transformer/Meter Cabinet Cover #1 19461 88-2060 TPTP88-2060 774 Transformer/Meter Cabinet Cover #2 19463 810-2060 TPTP810-2060 774 Secondary Service Cabinet Cover #3 50893 88-TPU#3 TPTP88-2436-3642 774 SSB Cover #4 (standard) 67541 77-2-332P 770-23 774 SSB Cover #4 (nonskid) 67540 77-2-332P-NS 770-23SN 774 6in Riser 39974 77R6 VR770-6 774 12in Riser 43256 77R12 VRTP770-12 810 Base 60564 810BL/ML VBTP810 810 Switchgear Cover (standard) 63354 810-SW-DP VLTP810-13-7076 810 Switchgear Cover (nonskid) 60566 810-SW-NS VLTP810-13-7076SN 810 Splice Vault Cover (nonskid) 39980 810-TPU-NS VLTP8103654-23 810 Riser/Reducer for Type 10 Switch 70489 n/a 7676-6050 5106 Vault (nonskid) 48250 5106-TPU VBTP5106 814 Vault 48256 814-TPU VTP814-02 818 Vault 48387 818-TPU VTP818-02 10X20 Panel Vault 48257 PANEL VAULT VBTP1020PV

C-UG-2000


Pollution and Erosion Control Plan (PECP) Page 1 Specification PG17-0059F

POLLUTION and EROSION CONTROL PLAN (PECP)

- 2 – PECP

Taylor Substation March 2017

TABLE OF CONTENTS

SECTION 1: ESTABLISH PROJECT BOUNDARY AND CLEARING LIMITS ................... 3 SECTION 2: CONSTRUCTION SITE STABILIZATION AND PROTECTION..................... 4 A. Silt Fences: ..................................................................................................................... 4 B. Coir Wattles: .................................................................................................................... 4 C. Emergency Erosion Control Supplies: .......................................................................... 4 D. Construction Entrance: ................................................................................................ 5 E. Vehicle and Equipment Staging: ...................................................................................... 5 SECTION 3: CONSTRUCTION PHASE ............................................................................. 6 A. Vehicles and Heavy Equipment: ...................................................................................... 6 B. Conservation of Native Materials: .................................................................................... 6 C. Spill Containment and Control Plan: ............................................................................ 6 D. Earthwork: ................................................................................................................... 7 E. Waste Concrete: .............................................................................................................. 7 F. Temporary Access Roads: .............................................................................................. 7 G. Additional Erosion and Sediment Controls: .................................................................. 7 H. Cessation of Work: ....................................................................................................... 8 SECTION 4: INSPECTION OF EROSION CONTROLS ..................................................... 9 A. Erosion Control Log Sheet:.............................................................................................. 9 B. Replacement of Ineffective Controls: ............................................................................... 9 C. Sediment Removal: ...................................................................................................... 9 SECTION 5: PERMANENT STABILIZATION MEASURES ..............................................10 A. Removal of Temporary Measures: ..................................................................................10 B. Seeding: .........................................................................................................................10 C. Mulch: .........................................................................................................................10 D. Plastic Sheeting: .........................................................................................................10 APPENDIX A-1 Daily Vehicle Inspection Sheet .................................................................. 1 APPENDIX A-3 Spill Containment and Control Plan ........................................................... 1 APPENDIX A-7 Erosion Control Inspection Log Sheet ....................................................... 1 APPENDIX A-8 Approved Seed Mixes for Various Locations ............................................. 1 APPENDIX B Construction Practices Plan .......................................................................... 1

NOTE: Not all Appendixes will be included in certain plans but their numbering sequence will remain for ease of referencing.

- 3 – PECP


SECTION 1: ESTABLISH PROJECT BOUNDARY AND CLEARING LIMITS The following actions shall be completed prior to any significant alterations to project area:

A. Tacoma Power will clearly flag all boundary and clearing limits associated with the site access and overall construction to prevent ground disturbance of critical riparian vegetation, wetlands and other sensitive sites beyond project’s boundary

B. Construction activity or movement of equipment into existing vegetated areas shall not occur until the limits are clearly marked.

C. The contractor shall ensure all construction personnel understand the boundary limits and they shall not operate any equipment outside of the established area or conduct any activities that will disturb the surrounding area.

- 4 – PECP


SECTION 2: CONSTRUCTION SITE STABILIZATION AND PROTECTION Prior to major earth disturbing activities, one or more of the following Best Management Practices (BMPs) shall be established by the contractor at all locations where water runoff may be expected to leave the site:

A. Silt Fences: (i.) Install down slope of all exposed areas where stormwater runoff may occur. (ii.) Silt fencing shall be purchased in continuous rolls and cut to avoid the use of

joints. When joints are necessary, the filter cloth shall be spliced together only at a support post, with a minimum 6-inch overlap and securely fastened at both ends to overlapping posts.

(iii.) Posts shall be spaced a maximum of 6-feet apart and driven securely into the ground.

(iv.) A trench shall be excavated approximately 8-inches wide and 12-inches deep along the line of posts and upslope from the barrier. The bottom flap of filter fabric shall be placed into trench and the trench backfilled with washed gravel.

(v.) If standard strength filter fabric is used, a wire mesh support fence shall be included between the fabric and the posts.

(vi.) Filter fabric shall not be stapled to existing trees. (vii.) The filter fabric shall be attached to the posts with heavy-duty staples that

are at least 1-inch long, tie wires or hog rings. (viii.) Silt fencing shall not be removed until the upslope area has been

permanently stabilized. (ix.) All silt fencing shall be inspected immediately after each rainfall and at least

daily during prolonged rainfall events with all required repairs immediately completed.

(x.) Silt fencing shall be installed parallel to any slope contours. (xi.) The contributing length of exposed soil to a fence line shall not be greater

than 100-feet. (xii.) Do not install below an outlet pipe or weir. (xiii.) Do not drive over or fill up against the silt fencing.

B. Coir Wattles: (i.) Coir wattles shall be placed in a single row, lengthwise, on the contour, with

ends of adjacent Coir wattles tightly abutting one another. (ii.) All Coir wattles shall be mesh enclosed. (iii.) Each Coir wattles shall be anchored by at least two (2) stakes driven

through the Coir wattles. The first stake in each shall be driven towards the previously laid Coir wattles in order to force the Coir wattles together. NOTE: At Contractor’s option, a pair of stakes may be provided on each end (one – 1 on each side) and wattle be tied down between the stakes.

C. Emergency Erosion Control Supplies: As a minimum, the contractor shall maintain the following materials on-site for emergency erosion control needs. (i.) 10-percent of the total quantity of erosion control material initially used to

establish the site. (ii.) Silt fence and/or straw Coir wattles. (iii.) Oil-Absorbing pads. (iv.) These items are in addition to the contractor’s standard Spill Prevention and

Control Plan.

- 5 – PECP


D. Construction Entrance: All construction sites will have a construction entrance identified and if necessary stabilized with quarry spalls and/or other crushed rock to reduce erosion and prevent sediment from being tracked onto existing roadways. (i.) If a new construction access is constructed, it shall consist of approximately

10-inches of 4-inch to 8-inch quarry spalls topped with 2-inch to 3-inch of crushed rock for a total pad thickness of 12-inches.

(ii.) The construction access shall be the full width of the vehicle ingress and egress area and up to 50-feet long depending on the size of the overall project and the soil conditions.

(iii.) Whenever possible, the construction access shall be placed on firm, compacted subgrade.

(iv.) Additional crushed rock shall be added as necessary to maintain the proper function of the construction access.

(v.) The overall site condition shall be monitored throughout the project and crushed rock added as necessary to ensure that it does not become overly muddy or dusty depending on the weather conditions.

E. Vehicle and Equipment Staging: (i.) The contractor shall document these Daily Vehicle Inspections on the

attached “Daily Vehicle Inspection Sheet” included as Appendix A-1 and submit these inspection sheets to the City weekly to become part of the project file.

(ii.) If while operating the equipment, repairs become necessary, the machinery will be returned to the staging area for the required maintenance unless doing so will result in the release of additional pollutants or hazardous materials.

- 6 – PECP


SECTION 3: CONSTRUCTION PHASE The following activities shall be followed throughout the construction phase:

A. Vehicles and Heavy Equipment: Vehicles and heavy equipment selected shall have the least adverse impacts on the environment as possible. Specific criteria include but are not limited to minimum size and lowest ground pressure.

B. Conservation of Native Materials: (i.) If possible, native materials shall be left where they were found. (ii.) If materials are moved, damaged or destroyed, they shall be replaced with a

functional equivalent during site rehabilitation. (iii.) Large woody debris, native vegetation, weed-free topsoil and native channel

material displaced by the construction activity shall be stockpiled, protected from erosion, and used during the final site rehabilitation.

(iv.) Vegetation that must be removed will be clearly identified within the clearing limits.

(v.) Attempts will be made to leave the root nodes in place from all trees or bushes that are cut down during the clearing operation.

C. Spill Containment and Control Plan: (i.) The spill containment and control plan is attached as Appendix A-3. (ii.) This plan contains the specific cleanup and disposal instructions for known

regulated or hazardous products, the quick response containment and cleanup measures that will be available on the site and their storage location; proposed methods for disposal of spilled materials; and employee training for spill containment.

(iii.) The contractor shall update this plan upon award of the contract and whenever additional regulated or hazardous materials are delivered to the project site and shall immediately submit this revised list to the Project Lead.

(iv.) Fuel hoses, oil drums, oil or fuel transfer valves and fittings shall be checked regularly for drips or leaks and shall be maintained and stored properly to prevent spills.

(v.) In the event of a discharge of oil, fuel, or chemicals into a stream, water body or wetland or onto land with a potential for entry into these state waters, containment and cleanup efforts shall begin immediately and be completed as soon as possible, taking precedence over normal work. Cleanup shall include proper disposal of any spilled material and used cleanup materials

(vi.) The following is a list of agencies that shall be notified by the contractor in the event of a hazardous product or material spill:

Spill Circumstance Agency

Release of hazardous product or material into the soil or water.

Washington State Department of Ecology, SWRO Spill Response Team, 360-407-6300.

Petroleum products released into the water.

National Response Center, 800-424-8802.

- 7 – PECP


Any spill requiring the notification of an outside agency.

Tacoma Power, Project Lead

(vii.) In the event that the contractor is unable to contain and clean-up the spill or release, they shall immediately contact: Cowlitz Clean Sweep, 888-423-6319 or another preapproved response contractor with the name and contact information submitted to Tacoma Power by the general contractor.

D. Earthwork: Earthwork (including drilling, excavation, dredging, filling and compacting) shall be completed as quickly as possible. Also refer to the Construction Specification, Section 02200. (i.) Excavation:

Material removed during excavation shall only be placed in locations where it cannot enter sensitive aquatic resources. Whenever topsoil is removed, it must be stored and reused on site to the greatest extent possible.

E. Waste Concrete: Practices to confine, remove and dispose of excess concrete, cement and other mortars or bonding agents including measures for washout facilities. (i.) Concrete truck chutes, pumps and internals shall only be washed out into

pre-established and dedicated infiltration ponds sized to provide full containment of the wash water. These dedicated ponds shall be located immediately adjacent to the location of the pour.

(ii.) Unused concrete remaining in the truck and/or pump shall be returned to the originating batch plant for recycling.

(iii.) Hand tools including, but not limited to, screeds, shovels, rakes, floats and trowels shall be washed off only into the pre-established infiltration pond.

(iv.) Any equipment that cannot be easily moved shall only be washed in areas that do not directly drain to natural or constructed stormwater conveyances.

(v.) Hardened concrete residue from the wash out operation shall be broken up and used as backfill or transported to an approved disposal site.

F. Temporary Access Roads: (i.) Temporary roads shall not be built across the mid-slope or on slopes

steeper than 30-percent. (ii.) Minimize soil disturbances and compaction:

• When feasible, low-impact, tracked equipment will be walked to the project site to eliminate the need for a temporary access road.

• Clearing and grubbing of vegetation shall be limited to the minimum amount necessary to complete the project.

G. Additional Erosion and Sediment Controls: Control measures used during construction or extended work stoppages. (i.) A copy of the approved stormwater plans shall be maintained on the job site

whenever construction is in progress. (ii.) Should the erosion and sedimentation control measures initially installed

prove to be inadequate, the contractor shall immediately install additional facilities as necessary to protect adjacent properties, sensitive areas, natural watercourses and/or storm drainage systems. Deficiencies and corrections or improvements will be noted on the Erosion Control Inspection Log Sheet.

(iii.) All exposed and unworked soils shall be stabilized by effective measures to protect the soil from the impact forces of raindrops, flowing water and/or wind.

- 8 – PECP


(iv.) From October 1 through April 30, no soil shall remain exposed and unworked for more than 2 consecutive days. From May 1 through September 30, no soil shall remain exposed and unworked for more than 7 consecutive days. This condition applies to all soils on site, whether at final grade or not.

• The project lead reserves the right to waive this condition on a case-by-case basis for projects or portions of projects where the existing slopes are less than 5-percent and the soil conditions are such that offsite erosion will not occur. If this condition is waived, it will be so noted in the final report.

• If site conditions later change and offsite erosion could occur, then the contractor shall immediately adopt all appropriate temporary erosion and sediment control measures.

(v.) Applicable practices include, but are not limited to, temporary and/or permanent seeding, placing sod, mulch, plastic covering, soil application of polyacrylamide (PAM), or the early application of gravel base on areas to be paved or treated for dust control.

(vi.) Soil stabilization measures shall be appropriate for the time of year, site conditions, estimated duration of use, and potential water quality impacts that stabilization agents may have on downstream waters and ground water.

(vii.) Soil stockpiles must be stabilized and protected with sediment trapping measures.

(viii.) If plastic sheeting is used, it shall have a minimum thickness of 6 mils and shall meet the requirements of the Washington State Standard Specifications for Road, Bridge and Municipal Construction.

(ix.) Plastic coverings shall be installed and maintained tightly in place by using sandbags with maximum 10-foot grid spacing in all directions. All seams shall be taped or weighted down along their full length and there shall be at least a 12-inch overlap.

(x.) Cut and fill slopes shall be designed and constructed in a manner to minimize erosion.

(xi.) Runoff velocities shall be reduced by limiting the continuous length of slope with terracing and diversions, reduce slope steepness and roughening of the slope surface.

H. Cessation of Work: Project operations will cease under high flow conditions that may result in inundation of the project area, except for efforts to avoid or minimize resource damage. All materials, equipment, and fuel must be removed if flooding in the area is expected to occur within 24-hours.

- 9 – PECP


SECTION 4: INSPECTION OF EROSION CONTROLS During construction, the contractor shall inspect all erosion control facilities and monitor in-stream turbidity daily during the rainy season and weekly during the dry season or after any major storm event that produces runoff to ensure the controls are working adequately. (Mandatory Activity)

A. Erosion Control Log Sheet: The contractor shall record these inspections on the Erosion Control Inspection Log Sheet attached as Appendix A-7 and submit a copy of these to the Project Lead weekly during the rainy season and monthly during the dry season and/or at the end of the project.

B. Replacement of Ineffective Controls: If monitoring or inspections show that the erosion controls are ineffective the contractor shall immediately mobilize work crews to make the necessary repairs, install replacement structures and/or install additional controls as necessary. Ineffective controls and replacements or improvements will be noted on the Erosion Control Inspection Log Sheet.

C. Sediment Removal: Sediment from the erosion control facilities shall be removed once it has reached one-third of the exposed height of the control structure.

- 10 – PECP


SECTION 5: PERMANENT STABILIZATION MEASURES A. Removal of Temporary Measures:

All temporary erosion and sediment control facilities shall be removed within 30 days after the final site stabilization is achieved or after the temporary facilities are no longer needed.

B. Seeding: Also refer to the Contract Specification, Section 02900. (i.) Seed mixture shall vary depending on the actual site conditions. Refer to

Appendix A-8 for pre-approved seed mixes. (ii.) The seed mixture shall be applied at a rate of at least 140 lb / Acre. (iii.) Seedbeds planted between May 1 and October 31 will require irrigation and

other maintenance as necessary to foster and protect the root structure. (iv.) Seedbeds planted between November 1 and April 30 shall be protected with

geotextile, erosion control blankets, jute mat or clear plastic coverings until the plants are fully established.

(v.) Planting shall not be done during windy weather or when the ground is frozen, excessively wet or the weather is otherwise non-conducive to satisfactory growth.

(vi.) When hydroseeding, the seed and fertilizer may be applied in one application provided that the fertilizer is placed into the tank no more than 30 minutes prior to application.

(vii.) Before seeding, install necessary surface control runoff measures such as gradient terraces, interceptor dikes and swales, level spreaders and sediment basins.

(viii.) Following initial surface roughening, the seedbed shall be firm with a fairly fine surface. Perform all operations across or at right angles to the slope.

C. Mulch: (i.) Mulch materials shall be long length wood fiber applied at the rate of 1500 to

2000 lbs/acre or straw mulch applied 2-inches to 3-inches deep. (ii.) Mulches shall be applied in all areas with an exposed slope greater than 2:1. (iii.) Mulching shall be applied immediately after seeding and in all areas, which

cannot be seeded because of inclement weather conditions. D. Plastic Sheeting:

The following BMPs are in addition to those previously listed under Section 3, “Construction Phase, Additional Erosion and Sediment Control Measures” and are intended for use while permanently stabilizing the site. (i.) Clear plastic sheeting shall be installed immediately on areas seeded

between November 1 and March 31 and remain until the vegetation is firmly established.

(ii.) Clear plastic sheeting shall be secured in the same manner as when used as a temporary erosion control measure.

(iii.) When the plastic covering is used on un-seeded slopes, it shall be kept in place until the next seeding period.

(iv.) Plastic covering sheets shall be buried (up to two feet) at the top of slopes in order to prevent surface water from flowing beneath the sheets.

1

APPENDIX A-1 Daily Vehicle Inspection Sheet

Project Name: All vehicles and equipment on site have been inspected for fluid leaks and fueled prior to leaving the staging area. All necessary repairs have been performed. Oil-absorption diapers around stationary equipment are in good condition, functional and secured. Any required maintenance related to fluid leaks is recorded under the “Notes” column.

Date: Printed Name: Signature: Notes:

1

APPENDIX A-3 Spill Containment and Control Plan

Project Name: The following spill containment and control plan shall be completed by the contractor and submitted to the Project Lead prior to work beginning on site. This plan shall be updated by the contractor and submitted to the Project Lead whenever additional regulated or hazardous materials are delivered to the project site. In the event of a spill the contractor shall notify the following agencies: Spill Circumstance: Agency: Release of Hazardous Product or material into soil or water.

Washington State Department of Ecology, SWRO Spill Response Team, 360-407-6300

Release of Petroleum Product into the water.

National Response Center, 800-424-8802

Any spill requiring the notification of an outside agency

Tacoma Power, Project Lead

In the event that the contractor is unable to contain and clean-up the spill or release, they shall immediately contact: Cowlitz Clean Sweep, 888-423-6319 or another preapproved response contractor with the name and contact information submitted to Tacoma Power by the general contractor. Instructions: Complete the following table by including the necessary information. Add additional lines and paragraphs as necessary. 1. PRODUCT OR MATERIAL:

A. Notification and Emergency Response Procedures:

B. Specific Clean-up and Disposal Instructions:

C. Clean-up Measures to be Available On-Site Including Their Storage Location:

D. Approved Disposal Methods of Spilled Materials:

E. Employee Training for Spill Containment:

1

APPENDIX A-7 Erosion Control Inspection Log Sheet

Project Name: All erosion control structures and facilities have been inspected and are operational. All required maintenance was performed and is noted below on the appropriate date. Date: Printed Name: Signature: Notes:

1

APPENDIX A-8 Approved Seed Mixes For Various Locations

Temporary Erosion Control Seed Mix

Percent Weight

Percent Purity

Percent Germination

Chewings or Blue Grass 40 98 90 Perennial Rye 50 98 90 Redtop or Colonial Bentgrass 5 92 85 White Dutch Clover 5 98 90 Landscaping Seed Mix

Percent Weight

Percent Purity

Percent Germination

Perennial Rye Blend 70 98 90 Chewings and Red Fescue Blend

30

98

90

Low-Growing Turf Seed Mix

Percent Weight

Percent Purity

Percent Germination

Dwarf Tall Fescue 45 98 90 Dwarf Perennial Rye (Barclay)

30

98

90

Red Fescue 20 98 90 Colonial Bentgrass 5 98 90 Bioswale Seed Mix

Percent Weight

Percent Purity

Percent Germination

Tall or Meadow Fescue 75-80 98 90 Seaside/Creeping Bentgrass 10-15 92 85 Redtop Bentgrass 5-10 90 80 Wet Area Seed Mix

Percent Weight

Percent Purity

Percent Germination

Tall or Meadow Fescue 60-70 98 90 Seaside/Creeping Bentgrass 10-15 92 85 Meadow Foxtail 10-15 90 80 Alsike clover 1-6 98 90 Redtop Bentgrass 1-6 92 85 Meadow Seed Mix

Percent Weight

Percent Purity

Percent Germination

Redtop or Oregon Bentgrass 20 92 85 Red Fescue 70 98 90 White Dutch Clover 10 98 90

1

APPENDIX B CONSTRUCTION PRACTICES PLAN

MONITORING REPORT FORMAT

Tacoma Power will submit a monitoring report to the Federal Energy Regulatory Commission (FERC) within 120-days of the project completion describing the success in meeting the Reasonable and Prudent Measures (RPMs) and the associated terms and conditions of the Biological Opinion and the attached Plan. This report will contain the following applicable information:

Project Identification:

(xiv.) Project name and detailed description of the project. (xv.) Project Lead’s name. (xvi.) Project location by the Hydrologic Unit Code (HUC) and by latitude and longitude as

determined from the appropriate United States Geologic Survey (USGS) 7-minute quadrangle map.

(xvii.) Starting and ending dates of the completed work

Photo Documentation:

Photo documentation of habitat conditions at the project site before, during and after project completion. (i.) Include general views and close-ups showing details of the project and project area,

including pre- and post-construction. (ii.) Label each photo with date, time, project name, photographer’s name and

documentation of the specific activity.

Additional Data:

Additional project-specific data for the individual project that may be included: (i.) Work cessation: Dates work ceased because of high flows, if any.

Pollution and Erosion Control Plan:

A summary of pollution and erosion control inspections, including any erosion control failures, contaminant releases and correction efforts.

Site Rehabilitation: Photo or other documentation that the site rehabilitation performance standards were met.

Documents

Taylor Substation – Civil Construction - Tacomacms.cityoftacoma.org/Purchasing/FormalBids/PG17-0059F Addendum_… · Taylor Substation – Civil ... H126P007 Taylor Substation Structural