PE Firm Registration No. 1151 PG Firm Registration No. 50103 RPLS Firm Registration No. 10011900

July 24, 2020

ACTON MUNICIPAL UTILITY DISTRICT GRANBURY, TEXAS

WASTEWATER TREATMENT PLANT NO. 1 IMPROVEMENTS

Addendum No. 3

Attention is called to the following modifications to the referenced Plans, Specification and Contract Documents for the above referenced project. The Acton Municipal Utility District (District) will receive bid forms and bid bonds for Wastewater Treatment Plant No. 1 Improvements at the District’s office, located at 6420 Lusk Branch Court, Granbury, TX 76049, until 2:00 p.m., local time on Tuesday, July 28, 2020, at which time the bids received will be publicly opened and read. We hereby modify the documents as follows:

DRAWINGS:

1. DELETE Sheet 06A-17 and REPLACE with the attached revised Sheet. The sheet has been revised to show the updated architectural details for the laboratory cabinets.

2. ADD Sheet 06A-18 with the attached Sheet. The sheet has been added to show the cabinetry of the Kitchen/Break Room Architectural Details.

3. DELETE Sheet 09E-03 and REPLACE with the attached revised Sheet. The sheet has been revised foradditional details for the generator installation.

SPECIFICATIONS:

1. Section 11401 “Biofiltration System”, 2.1.A: ADD the following approved manufacturers to the list:a. Anua.

2. Section 16280 “Low Voltage Active Harmonic Filter System”: ADD the specification included in thisaddendum.

CLARIFICATIONS:

1. Reserved.

This addendum consists of ten (10) pages and becomes a part of the referenced plans, specifications and contract documents and shall be acknowledged by the bidder and attached to the bid packet submitted.

By Joshua L. Berryhill, P.E. #100323 Project Engineer 7/24/2020

(V) (A)

15'-4 15/16"

1'-11 1/8"

VACUUM SERVICEVALVE, TYP.

AIR SERVICEVALVE, TYP.

DISHWASHER

36"SINKBASE

ICEMAKER

CHEMICAL RESISTANTPREFAB ROLL-TOPLAMINATE COUNTERWITH SPLASH GUARDCHEMICAL RESISTANTPREFAB ROLL-TOPLAMINATE COUNTERTOP ONLY, WITHSPLASH GUARD

1" x 2" SUPPORTSTRIP ANCHOREDTO WALL

1'-4"

2'-6"

1" x 2" SUPPORTSTRIP ANCHOREDTO WALLPIPE CHASE

DOUBLE BOWLSTN. STL. SINK

0'-6"2'-5"

0'-6"2'-7 3/8"

LABORATORY CABINET SOUTH ELEVATION DETAILSSCALE: 3/8" = 1'-0"

(V) (A)

24"SINGLE

24"SINGLE

24"SINGLE

1" x 2" SUPPORTSTRIP ANCHOREDTO WALL

PIPE CHASE

SERVICE VALVE

2 DEEPAND

1 SHALLOWDRAWER

2 DEEP AND1 SHALLOW

DRAWER

DRYINGOVEN

9'-3"3'-3"4'-0"2'-0"

MUFFLEFURNACE

HOOD

1'-4"

2'-6"

0'-6"2'-5"

CHEMICAL RESISTANTPREFAB ROLL-TOPLAMINATE COUNTERWITH SPLASH GUARD

5'-0"

2'-1

1"0'

-4"

LABORATORY CABINET SOUTH ELEVATION DETAILSSCALE: 3/8" = 1'-0"

SAFETYSHOWER /EYEWASH

REFRIGERATORBOD

INCUBATOR

0'-6"3'-0"

0'-4"3'-0"

LABORATORY CABINET WEST ELEVATION DETAILSSCALE: 3/8" = 1'-0"

GGFF

R

HH

-

6'-6"

RESTROOM WESTELEVATION DETAILS

SCALE: 3/8" = 1'-0"

CAP CROSSAND SPOUT

SHOWERHOSE TOBE 60" MIN.

SOAPDISH

ADASHOWER SEAT

FIBERGLASSSHOWER PANDOUBLE SEEP DRAINWITH VINYL MEMBRANEAT FLOOR, SEE DETAIL

4" x 4" CERAMIC TILE WITH1/2" BACKING BOARD

NOTE:SHOWER NOZZLE CONTROLAREA SHALL BE 48" TO CLABOVE SHOWER FLOOR

LOCKER ROOM SOUTHELEVATION DETAILS

SCALE: 3/8" = 1'-0"

LOCKERS

0'-4

"0'

-8"

6'-0

"

1'-6

"

TYPICAL DOOR DETAILSSCALE: 3/8" = 1'-0"

NOTES:1. PROVIDE / INSTALL STEEL FRAMES WITH DOORS REQUIRING GLAZING.

2. PROVIDE / INSTALL CLOSER (NORTON No. 8301 ALUMINUM FINISH). WITH ALLEXTERIOR DOORS.

3. PROVIDE / INSTALL NECESSARY JAMS, TRIM AND THRESHOLDS FOR ALL DOORS.

TYPE 2 TYPE 3 TYPE 6

2'-1

0"

1'-8"

2'-1

0"

1'-8"

1/4" WIRE GLASS18" MIN

24" PREFERREDPULL SIDE

60"

MIN

48"

MIN

XPUSH SIDE

DOOR SWINGCLEARANCES

NO SCALE

NOTE:

"X" = 12" IF DOOR HAS BOTHA CLOSER AND LATCH

LABORATORY CABINET EAST ELEVATION DETAILSSCALE: 3/8" = 1'-0"

4'-7

"

FIRECABINET

3'-7"2'-0"

6 3/

4"

3'-5

"

6'-1

1"11

"

2'-7 1/2"1'-4"

D

MUFFLEFURNACE

HOOD

5'-0"

HH

0'-6"

(V) (A)

24"SINGLE

24"SINGLE

24"SINGLE

2 DEEPAND

1 SHALLOWDRAWER

2 DEEP AND1 SHALLOW

DRAWER

6'-0"4'-0"2'-0"

2'-1

1"0'

-4"

0'-6"

CHEMICAL RESISTANTPREFAB ROLL-TOPLAMINATE COUNTERWITH SPLASH GUARD

2'-1

1"0'-4

"

PIPE CHASE

3'-7 9/16" 3'-7 9/16"2'-4 7/16" 3'-5 5/16"

WATER CLOSET: TO TOP OF SEATMAXIMUM HEIGHT FOR FLUSH VALVEGRAB BARS: TO CENTERLAVATORIESMINIMUM KNEE CLEARANCEMAXIMUM TO TOPMIRRORS: (ABOVE SINKS)

MINIMUM TO TOP OF MIRRORSHELVES AND DISPENSERS:

SWITCHES AND CONTROLS: MAXIMUM TO CENTERELECTRICAL AND COMMUNICATION RECEP.:

RESTROOMS:

MIN. FROM BOTTOM OF DEVICE TO FLOOR

ACCESSIBLE17" - 19"

34"

29"34"

40"

74"

48"

15"

FIXTURE MOUNTING HEIGHTS (ADULT)

44"

HANDICAP

SEE

CH

AR

T

SEE

CH

AR

TSE

E C

HA

RT

WATERCLOSET

LAVATORY

SEE

CH

AR

TSE

E C

HA

RT

SEE

CH

AR

T

SHELVESAND

DISPENSERS

MIRROR

SEE

CH

AR

T

SEE

CH

AR

TSEE

CH

AR

T

FINISHEDFLOOR

ELECTRICAL ANDCOMMUNICATIONRECEPTACLES

HANDICAP ACCESSIBLEFIXTURE HEIGHTS

NO SCALE

SWITCHESAND

CONTROLS

TOILET DETAILSSCALE: 3/8" = 1'-0"

HANDICAP ACCESSIBLETOILET STALL

PLAN VIEW

SIDE TOILETSTALL WALLELEVATION

12"

MA

X36

" M

AX

54"

MIN

18"36" MIN

FLUSH VALVELEVER TO DOORSIDE OF STALL

34"

17"

- 19"

15"

- 48"

12"MAX

36" MAX54" MIN

GRAB BARWHERESCHEDULED

TOILETPAPERHOLDER

2'-1"

2'-5

"2'-1

0"

MIRROR

3/4" PLYWOOD WITHPLASTIC LAMINATE

SINK, REFER TOPLUMBING PLANS

PLASTIC LAMINATEON TOP EDGE ANDBACKSPLASH

1-1/2"x1-1/2"x3/16"ANGLE BRACKETANCHORED TOWALL WITH LAGBOLTS @ 4'-0" O.C.MAX

FIXED PANEL ATEXPOSED ENDS

RESTROOM SINK ELEVATIONNO SCALE

3'-4

"

MAXIMUM DISTANCE FROM FINISHED FLOOR TO BOTTOMOF VIEWING SURFACE

MAXIMUM HL TO CONTROL DEVICE 48"MAXIMUM TOE CLEARANCE 25"MINIMUM TO FINISHED FLOOR 40"

60" MIN

12"24"

42"

MIN

.

9"MAX

INSTANTANEOUSWATER HEATER

A

REVISIONNO.

1DATE

2

B C D

4

3

5

A B C D

E F

J.B.H. / S.A.E.

DRAWN BY

CHECKED BY

DESIGNED BY

G

07/24/2020

DATE

SCALE

H I

1

2

E F G

3

4

H I

5

BAR IS ONE INCH ONORIGINAL DRAWING

IF NOT ONE INCH ONTHIS SHEET. ADJUST

SCALES ACCORDINGLY.

0 1

ACTON MUNICIPAL UTILITY DISTRICTTWDB CWSRF - WWTP NO. 1 IMPROVEMENTS

ENVIRONMENTAL AND CIVIL ENGINEERING402 Cedar Street325-698-5560 PE Firm Registration No. 1151

Abilene, Texas 79601

ENPROTEC/HIBBS & TODD, INC.

PG Firm Registration No. 50103RPLS Firm Registration No. 10011900

16-6633

SHEET No.

SEQUENCE No.

PROJECT NO.:

OF 184

ADDENDUM No. 33 07/24/2020

J.L.B.

J.L.B.

07/24/2020

3/8" = 1'-0"

06A-17ARCHITECTURAL DETAILS I

115

3

10'-4 7/8"

KITCHEN/BREAK ROOM CABINETSOUTH ELEVATION DETAILS

SCALE: 3/8" = 1'-0"

REFRIGERATOR

3'-0"

KITCHEN/BREAK ROOM CABINETWEST ELEVATION DETAILS

SCALE: 3/8" = 1'-0"

FF

R5'-9 5/8"

20"SINGLE

20"SINGLE

2 DEEP AND1 SHALLOW

DRAWER

6'-0"2'-6"

0'-6"

2'-1

1"0'

-4"

0'-1"

2'-1

1"0'-4

"

PIPE CHASE

4'-0"

2'-5"

0'-4" 1'-10 15/16"

1" x 2" SUPPORTSTRIP ANCHOREDTO WALL

24"SINGLE

2 DEEP AND1 SHALLOWDRAWER

2 DEEP AND1 SHALLOWDRAWER

14"SINGLE

0'-4"

36"SINKBASE

A

REVISIONNO.

1DATE

2

B C D

4

3

5

A B C D

E F

J.B.H. / S.A.E.

DRAWN BY

CHECKED BY

DESIGNED BY

G

07/24/2020

DATE

SCALE

H I

1

2

E F G

3

4

H I

5

BAR IS ONE INCH ONORIGINAL DRAWING

IF NOT ONE INCH ONTHIS SHEET. ADJUST

SCALES ACCORDINGLY.

0 1

ACTON MUNICIPAL UTILITY DISTRICTTWDB CWSRF - WWTP NO. 1 IMPROVEMENTS

ENVIRONMENTAL AND CIVIL ENGINEERING402 Cedar Street325-698-5560 PE Firm Registration No. 1151

Abilene, Texas 79601

ENPROTEC/HIBBS & TODD, INC.

PG Firm Registration No. 50103RPLS Firm Registration No. 10011900

16-6633

SHEET No.

SEQUENCE No.

PROJECT NO.:

OF 184

ADDENDUM No. 33 07/24/2020

J.L.B.

J.L.B.

07/24/2020

3/8" = 1'-0"

06A-18ARCHITECTURAL DETAILS II

116

A

REVISIONNO.

1

DATE

2

B C D

4

3

5

A B C D

E F

DRAWN BY

CHECKED BY

DESIGNED BY

G

07/24/2020

DATE

SCALE

H I

1

2

E F G

3

4

H I

5

BAR IS ONE INCH ONORIGINAL DRAWING

IF NOT ONE INCH ONTHIS SHEET. ADJUST

SCALES ACCORDINGLY.

0 1

ACTON MUNICIPAL UTILITY DISTRICTTWDB CWSRF - WWTP NO. 1 IMPROVEMENTS

ENVIRONMENTAL AND CIVIL ENGINEERING402 Cedar Street325-698-5560 PE Firm Registration No. 1151

Abilene, Texas 79601

ENPROTEC/HIBBS & TODD, INC.

PG Firm Registration No. 50103PE Firm Registration No. 1151PG Firm Registration No. 50103

RPLS Firm Registration Nos. 10011900

16-6633SEQUENCE No.

PROJECT NO.:

OF 184SHEET No.

TWDB SUBMITTAL SET1 02/20/2020

CONSTRUCTION SET2 06/12/2020

ADDENDUM NO. 33 07/24/2020

NO SCALE

09E-03ELECTRICAL DETAILS SHEET 3

180

Acton Municipal Utility District TWDB WWTP No. 1 Improvements LV Active Harmonic Filter Project No. 6633 16280 - 1 July 24, 2020

SECTION 16280

LOW VOLTAGE ACTIVE HARMONIC FILTER SYSTEM PART 1 GENERAL

1.1 SECTION INCLUDES:

A. This specification defines the requirements for active harmonic filter systems

to meet IEEE-519-2014 electrical system requirements for harmonic current limits. The active harmonic filter shall maintain power factor between 0.95 and 0.999 lagging when operated within limits.

1.2 REFERENCES: A. The active harmonic filter system shall be designed in accordance with the

applicable sections of the following documents: ANSI C62.16 surge protection IEEE 519-2014 UL 508 ARRA – American Recovery Investment Act. Manufactured in the USA. The products shall include third party approvals by cULus.

1.3 SYSTEM DESCRIPTION: A. System Description:

1. Voltage: 480/600 Volts, 60 Hz, 3 phase, 3 wire plus ground. 2. Current Rating: Provide the rated current as indicated on the drawings. 3. Current Transformers:

a. Two current transformers are required and mounted on phases

A & C.

b. Current transformers are an integral part of the active harmonic filter. When current transformers are installed external to the active harmonic filter equipment, the contractor shall be responsible for the installation of manufacturer provided current transformers.

c. Current ratings of the current transformers shall be according to full load current of the circuit on which installed. Primary rating or 500A, 1000A, 3000A, or 5000A with a secondary rating of 5A are acceptable.

d. Current transformers rated for 400 hertz shall be used.

e. The current transformers shall be placed as close as possible to the non-linear load to be conditioned, within manufacturer guidelines.

Acton Municipal Utility District TWDB WWTP No. 1 Improvements LV Active Harmonic Filter Project No. 6633 16280 - 2 July 24, 2020

B. Philosophy of Operation: The active harmonic filter shall electronically supply the non-fundamental current demanded by the non-linear load that results in a near sinusoidal current being drawn from the supply.

C. Performance Requirements: 1. Response Time:

a. In a steady state condition, the active harmonic filter shall have

a response time of less than one (1) line cycle.

b. In the event of a load change or transient condition, the response time shall be within three (3) line cycles.

D. Input Power: 1. Voltage: 480 Volt, 3 phase, 3 wire plus ground 2. Voltage Tolerance: +/- 10% of nominal 3. Frequency: automatically adapted to 60Hz, +/- 3% 4. Input Circuit Breaker: 65k AIC Rated

E. Output Performance:

1. Performance of the active harmonic filter shall be independent of the

impedance of the power source. All performance levels shall be attained whether on the AC lines, backup generator, or output of UPS.

2. Harmonic Correction: a. Limit the 2nd through 50th order harmonic current to <5%

TDD at each installed location indicated herein. Levels for individual harmonic orders shall comply with respective levels established in ANSI/IEEE std 519-1992, Table 10-3.

b. Limit the THD (V) added to the electrical system immediately upstream of the active line conditioner location(s) to less than or equal to 5%. The active harmonic filter shall not correct for utility supplied voltage distortion levels.

3. Reactive Current Compensation shall improve power factor to be to between 0.95 and 0.999 lagging.

1.4 ENVIRONMENTAL CONDITIONS: The active harmonic filter shall be able to withstand the following environmental conditions without damage or degradation of operating characteristics or life. A. Operating Ambient Temperature: 00C to 400C.

B. Storage Temperature: -400C to 650C.

Acton Municipal Utility District TWDB WWTP No. 1 Improvements LV Active Harmonic Filter Project No. 6633 16280 - 3 July 24, 2020

C. Relative Humidity: 0 to 95%, non-condensing.

D. Altitude: Operating to 1000 meters (3300 ft).

PART 2 PRODUCT

2.1 ENCLOSURE: A. Each filter shall be provided in a UL Type 12 rated enclosure.

B. All UL Type 12 enclosed units shall have means to prevent the door from being

opened when the unit is energized. This can be achieved by either: 1. A door-interlocked circuit breaker that provides power interruption

when the door is opened. The circuit breaker shall be lockable in the power-off position. Units shall be disconnected from the power source by a disconnect device or circuit breaker contained in the power distribution center as defined by local and national codes for branch circuit protection. OR

2. A mechanism that locks the door when the unit is energized.

C. Freestanding units shall include lifting provisions by forklift truck and lifting lugs. Wall mount units weighing more than 80 pounds shall be equipped with a means of lifting, such as lifting lugs.

D. Door Mounted Digital HMI Operator Interface.

E. All units shall be provided with a grounding lug. Grounding by the contractor is to be performed according to local and national electric code.

F. The paint shall be the manufacturer’s standard type and color.

G. All enclosed units shall have a door-interlocked disconnect for power interruption when the door is opened.

2.2 OPERATOR CONTROLS and INTERFACE: A. The active harmonic filter shall require minimal field programming.

B. The active harmonic filter shall contain a color touch screen display with the

following features: 1. A minimum display size of 5.6 inches, 65k colors, and LED backlight.

2. Easily navigable screens, including Home, Status, Fault and Setup

screens.

3. Display voltage and current waveform data along with RMS metering data.

Acton Municipal Utility District TWDB WWTP No. 1 Improvements LV Active Harmonic Filter Project No. 6633 16280 - 4 July 24, 2020

4. A gauge-based indicator of active filter current usage, from 0 to 100% of capacity. Dual state indications of nominal operation and “at capacity” operation.

5. An alarm history buffer saved in non-volatile. Buffer information shall persist between power outages, with a minimum of 128 event entries.

6. Ability to set the end user Line/Load CT ratio of the active harmonic filter system.

7. The Operator Interface shall show THD, Power Factor, RMS Current, RMS Voltage, and Fault History.

C. The active harmonic filter shall have the ability to operate in three (3) modes: i) harmonic correction only mode, ii) power factor correction only mode, or iii) combination harmonic and power factor mode. All three control modes shall be configurable from the local operator color touch screen display.

D. The active harmonic filter shall have a configurable relay-based run/stop command input in addition to the manual and auto run/stop commands. The active filter shall have a configurable relay-based fault output. Each contact shall be rated for 2.0 Amperes at 250 volts.

E. The filter shall have a configurable network-based run/stop command input in addition to the manual and auto run/stop commands.

F. The filter shall have the ability to load and save operational parameters in non-volatile persistent memory and the ability to revert to factory default parameter settings.

G. The filter shall possess an integrated industry standard serial TIA/EIA-485 / RS-485 fieldbus slave network connection such as Modbus RTU for remote monitoring and operation of the active filter.

H. The filter shall have the ability to communicate over a standard industrial Ethernet communications network such as Ethernet/IP Modbus TCP/IP if specified.

I. The unit shall automatically begin to correct harmonic currents after power up without the need for operator intervention.

J. The unit shall have the ability to display trend history data for line voltage, line current, filter current, current THD, filter bus voltage, and filter heatsink temperature.

2.3 DESIGN: A. All active harmonic filters shall be defined as power electronic devices which

consist of power semiconductors and a DC bus that acts to inject current into the AC line that will cancel undesirable harmonic currents drawn by the load. A DC bus shall store power for power semiconductor switching. A digital microcontroller shall control the operation of the power converter.

Acton Municipal Utility District TWDB WWTP No. 1 Improvements LV Active Harmonic Filter Project No. 6633 16280 - 5 July 24, 2020

B. The active harmonic filter shall feature fully digital synchronous frame controls for selected harmonics to enhance drive load compatibility.

C. The active harmonic filter shall feature a fully digital, broadband current regulator with progressive gains to eliminate system resonance tuning issues and simplify startup and commissioning.

D. The active harmonic filter shall feature single processor control of all power electronic devices per a single active filter to reduce fault response latency and harmonic correction loop times.

E. Each unit shall be designed with over-current and current limiting self-protection. Operation shall continue indefinitely at manufacturer defined safe operating levels without trip off or destruction of the active harmonic filter.

F. Large units (capacity>150A) shall have built in redundancy so at least one half of the corrective current capacity is available after a normal single point fault.

G. All inductive elements in the power circuit of active harmonic filter shall be coreless, in order to maintain constant inductance and avoid saturation at high current levels.

H. Units shall detect heatsink temperature and have the ability to fold back the current limit based on the temperature measurement.

I. Two distinct levels of faults shall be employed: Critical and Non-critical levels Non-critical level faults will provide automatic restart and a return to normal operation upon automatic fault clearance. Critical level faults stop the function of the unit and await operator action to restart. 1. Faults such as AC line power loss shall be automatically restarted upon

power restoration. Upon removal of these fault conditions, the active line conditioner shall restart without user action.

2. All other faults shall be considered critical faults and stop the active harmonic filter. The run relay shall be disabled and the fault relay enabled. User shall be required to initiate a power reset (cycle power off and on) to restart the active harmonic filter.

J. The logic of the active harmonic filter shall monitor the load current by utilizing two (2) current transformers (CTs) mounted on phases A and C to direct the function of the power electronic converter.

K. Multiple active harmonic filters may be installed in parallel to inject current. The units will function independently. If one unit is stopped or faulted, the remaining units will continue to operate normally.

L. Individual unit characteristics, including sample drawings, weight, and watts loss, can be found in the Installation, Operation, and Maintenance Manual.

Acton Municipal Utility District TWDB WWTP No. 1 Improvements LV Active Harmonic Filter Project No. 6633 16280 - 6 July 24, 2020

M. Approved Manufacturers: 1. TCI, LLC, Germantown, WI 2. Square-D 3. Eaton

END OF SECTION