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DATE: March 26, 2010 ADDENDUM NUMBER: 1 MODIFYING: Specifications No. 1648 PROJECT: Robert B. Diemer Water Treatment Plant Fire and Potable Water Pump BID TIME AND DATE: 2:00 p.m., April 6, 2010 FROM: THE METROPOLITAN WATER DISTRICT OF SOUTHERN CALIFORNIA

700 North Alameda Street, Third Floor – Specifications Desk Los Angeles, California 90012 (213) 217-6515

TO: All prospective bidders This addendum forms a part of the contract documents. Use Specifications No. 1648 as originally issued to submit bids, in conjunction with this addendum, and acknowledge receipt of this addendum by completing Document 00420, “Bidder's General Information,” in the specifications. This addendum consists of 5 pages of text and 11 sheets of 11” x 17” drawings. CHANGES TO SPECIFICATIONS:

1. In Section 02922, “Erosion Control,” Paragraph 3.09A, in the last sentence delete the words “to determine if the Contractor ….. Section 02970”

2. In Section 02922, delete Paragraph 3.09B in its entirety 3. In Section 16110, “Raceways,” subparagraph 2.11A.1, change the words “as shown on the drawings” to read: as

shown on Sheet 6E-1. 4. In Section 16110, delete Paragraph 2.11B and replace with the following:

B. Manhole covers and frames shall be heavy-duty, suitable for AASHTO H-20 loading, either round cast iron with machined bearing surfaces or hinged-type square or rectangular covers, spring-loaded with recessed handle and safety catch as shown on Sheet 6E-1, Manhole Schedule

5. In Section 16110, delete subparagraphs 2.11B.1 through 2.11B.3 in their entirety.

CHANGES TO DRAWINGS:

6. The following reference drawings are being provided for information. Prints of the reference drawings are attached.

Reference No. Sheet No. Drawing No.

1. 1E-2 B-122499

2. 1E-4 B-122500

3. 1E-5 B-122501

4. 1E-6 B-122502

5. 1E-7 B-122503

6. 1E-11 B-122507

7. 1E-15 B-122511

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8. 1E-16 B-122512

9. 1E-17 B-122513

10. 1E-19 B-122515

11. 1E-20 B-122516

7. Metropolitan has made changes to the following drawings without issuing revised drawings at this time; however, Metropolitan will issue revised drawings showing these changes after the contract is awarded. Reference No.

Sheet No.

Drawing No.

Description of Changes

1. E-41 B-133023 In Detail 10 make the following changes:

1) Under SECTION, change “GROUND ROD (1” DIA. X 10’)” to read: GROUND ROD (3/4” DIA. X 10’)

2) Under SECTION, add ground cable from lower right conduit to ground loop in man hole/hand hole.

3) Under PLAN, change the words “WATERTIGHT HINGED HOT-DIPPED GALVANIZED STEEL TRAFFIC DUTY COVER AND FRAME HS-20 LOADING” to read: WATERTIGHT SPRING LOADED, HINGED, HOT-DIPPED GALVANIZED STEEL COVER. COVER AND FRAME SHALL MEET H-20 HEAVY DUTY TRAFFIC LOADING.

4) Under PLAN, change the words “INSCRIPTION AS REQUIRED SEE DWG B-” to read: INSCRIPTION AS REQUIRED. SEE MANHOLE SCHEDULE ON SHEET 6E-1

2. E-44 B-133026 In Detail 5 make the following changes:

1) Under PLAN, change “(SEE NOTE)” to “(SEE NOTE 1)” at two places

2) Under PLAN, change the words “4/0 AWG BARE COPPER GROUND CENTERED ON DUCT RUNS” to read: BARE COPPER GROUND CENTERED ON DUCT RUNS. SEE PLAN FOR SIZE.

3) Under PLAN, change the words “INSCRIPTION AS REQUIRED SEE DWG B-” to read: INSCRIPTION AS REQUIRED. SEE MANHOLE SCHEDULE ON SHEET 6E-1

4) Under SECTION A, change the words “TRAFFIC TYPE CAST IRON ROUND COVER W/BRONZE LOCKING BOLTS & SEALING RING” to read: SEE MANHOLE SCHEDULE FOR COVER TYPE & SIZE

5) Under SECTION A, change the words “GRADING RINGS AS REQUIRED” to read: GRADING SPACERS AS REQUIRED

6) Under SECTION A, change the words “GROUND ROD (3/4” X 10’)” to read: COPPER CLAD GROUND ROD (3/4” x 10’)

7) Under SECTION A, Grid E-5, change “4/0” to read: SEE PLAN FOR GROUND CABLE SIZE

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Reference No.

Sheet No.

Drawing No.

Description of Changes

3. E-44 B-133026 In Detail 6 make the following changes:

1) Change title “MANHOLE AND HANDHOLE GROUNDING” to “MANHOLE AND HANDHOLE INSTALLATION”

2) Add ground cable from lower right conduit to ground loop in manhole/handhole.

3) Under PLAN add callout pointing to the manhole cover that reads: WATERTIGHT SPRING-LOADED, HINGED, HOT-DIPPED GALVANIZED STEEL COVER. COVER AND FRAME SHALL MEET H-20 HEAVY DUTY TRAFFIC LOADING.

4) Under PLAN, change “INSCRIPTION AS REQUIRED SEE DWG B-” to read: INSCRIPTION AS REQUIRED. SEE MANHOLE /HANDHOLE SCHEDULE

4. E-44 B-133026 Under NOTES in Grid J-8, add number “1” in front of “MANHOLE & HANDHOLE REFER TO…”

5. C-2 B-132912 Under GENERAL CIVIL NOTES, add Note 15 as follows:

15. POTABLE WATER AND FIRE PROTECTION WATER PIPING SHALL BE HYDROTESTED AND APPROVED BY THE ENGINEER BEFORE CONNECTING TO EXISTING PIPING SYSTEMS.

6. C-5 B-132915 Under NOTES, add Notes 8 through 10 as follows:

8. AT LEAST 2 LANES OF TRAFFIC SHALL BE OPEN AT ALL TIMES.

9. CONTRACTOR SHALL INSTALL MFE 90-DEGREE BEND TO EXISTING VALVE

10. CONSTRUCT 6” CONCRETE SLAB WITH #5 @ 12” EW PER DETAIL 1, SHEET S3.13. CONCRETE SLAB SHALL BE 10’ X 5’. OBTAIN ENGINEER’S APPROVAL FOR EXACT LOCATION AND ELEVATION UNDER 36” VALVE

7. C-5 B-132915 In Grid D-4, add callout “SEE NOTE 8” pointing to the Plant Access Road.

8. C-5 B-132915 In Grid J-5, add callout “VPI STA 5+31.61, CENTERLINE El 720.12, MFE BEND, SEE NOTE 9” pointing to the 90-degree bend

9. C-5 B-132915 In Grid K-4/5, revise the callout to read: END 36” POTABLE WATER, STA 5+35.07, JOIN EXISTING 36” FLANGE OF VALVE, (CENTERLINE EL 720.12, SEE SHEET 6M-9)

10. 6M-5 B-132986 In Grid I-3, change valve symbol for 12”-V-109 from a ball valve to a gate valve (see Sheet I-2 for symbol)

11. 6M-9 B-132990 Grid G/H-2, add callout “TO BE INSTALLED AS PART OF THIS CONTRACT” pointing at the MFE 36”-90-degree elbow

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Reference No.

Sheet No.

Drawing No.

Description of Changes

12. 6E-1 B-133036 Add the following table to this sheet: MANHOLE SCHEDULE

DESIGNATION INSIDE DIMENSION

COVER MARKING COVER TYPE

MH C107 48” X 48” CONTROL - 120V SPRING-LOADED HINGED MH I107 48” X 48” INSTRUMENTATION SPRING-LOADED HINGED MH K107 72” X 48” POWER - 4.16kV ROUND CAST IRON MH P107 96” X 72” POWER - 480V ROUND CAST IRON

QUESTIONS AND CLARIFICATIONS:

Requests for clarification of details on the drawings or of provisions of the specifications have been identified. The questions with the appropriate Metropolitan responses are as follows:

(1) Question: Reference is made to Sheets C-4 (Construction Notes 16 and 18), 6S-1, and 6S-2 detail C. In Sheet C-4, Note 16 calls out for 6” thick concrete paving, but in Sheet 6S-2/C, plans call out for 12” thick concrete slab with deep section around retaining walls. Likewise, Note 18 in C-4 calls out for a 6” gravel surface, but 6S-1 calls out for 12”-thick concrete slab. Please clarify.

Answer: The structural drawings (Sheet 6S-1 and 6S-2) show the details for the structural slabs at the Potable Water Pumps and the Fire Water Pumps, as well as the outlines for the UPC, MCC foundations and retaining walls. The civil drawings show the grading and paving up to and around these areas.

(2) Question: Reference is made to Sheets 6S-1 and 6S-2 Retaining Wall Schedule. Based on the top of wall elevations and slab finish grade elevations, there are portions of the retaining wall that we cannot meet the H (max.) of the wall and the 1’-6” minimum of the concrete slab shown in Detail C in 6S-2. Should the bidder use the “Wall Type” dimensions shown, or the correct wall type based on the actual height of the wall?

Answer: Wall height can be met by using the actual height of wall to select wall dimensions from the schedule.

(3) Question: Can the ‘single source’ ready mix requirement, as specified in Section 03300, subparagraph 1.02A.1 be waived?

Answer: No. The “single source” requirement for ready-mixed concrete is enforced for the prime contractor; however, the subcontractors may choose different ready-mix vendors, and each will be allowed to receive deliveries from one source. As such, the Contractor and its subcontractors shall each receive ready-mix concrete from only one ready-mix vendor.

(4) Question: Can DI pipe and fittings be an acceptable alternate to fabricated steel piping on this project, above ground, below ground or both?

Answer: No. Ductile iron pipe and fittings shall not be used in lieu of fabricated steel.

(5) Question: A. Is power available from the pole across the street from the batch plant?

B. Could temporary power poles be installed up to the upper work and storage area?

Answer: A. No. SCE will not provide another meter at that or any other location on site. Any power required by the Contractor from that location must be coordinated and negotiated with DORP contractor.

B. No. Temporary power poles along the primary access road will not be allowed. There is some power available at the old scale house just west of Site H. There is a 240/120 volt panel being fed by a 5kVA transformer (at 240 volts it can be loaded up to a 20 Amp circuit max). The Contractor would be required to install a meter for reimbursing Metropolitan for the power

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used. Temporary power lines from the scale house must be underground (no overhead power lines across the road or chlorine blacktop area). Underground power line shall be installed below fire and potable water lines scheduled to be installed by DORP contractor.

(6) Question: Numerous sections of the specifications specify NSF 61 certification required for materials and/or equipment in contact with potable water. If we can’t find NSF 61 certified materials and/or equipment that meet the technical specifications, what should we provide for such materials and/or equipment?

Answer: If the materials and/or equipment are NSF 61 certified but do not meet all the technical specifications, they will not be approved for use on the project. In instances where no materials and/or equipment requiring NSF 61 certification is available, the Contractor shall provide documentation in their submittal supporting that fact, and shall propose only materials and/or equipment that meet the technical specifications for review and approval by the Engineer.

(7) Question: What is the correct material for the Horizontal Pipe on Sheet 6M-7, Section C, called out as E3? If you look at the plan view on Sheet 6M-4 the same pipe is connecting to A3 Material. Please confirm which is correct.

Answer: Stainless steel pipe is used on both sides of the flow meter 6FE-160, and the extent of stainless steel pipe used is shown by the dimension line with the letter “E” on the center on Sheet 6M-7, Section C. See Plan 1 on Sheet 6M-3 (Grid D-7) and Section C on Sheet 6M-7 (Grid B-2).

(8) Question: Sheet 6M-5, Plan 3 drawing indicates ball valve symbol with a callout for V-109, Gate Valve per Section 15100, page 28. Please confirm which is correct.

Answer: Valve V-109 is a gate valve. Valve symbol was incorrectly shown. Refer to Changes to Drawings in this addendum.

(9) Question: Sheet 6M-5, Plan 3 indicating 2” D-D Pipe. The drawing is calling out for Detail M-8, Det. 2 Clean Out. This detail is calling for 4” plug. Please confirm which is correct.

Answer: The 2” D-D pipe and 4” plug are correct as shown and are connected to the 8” D-D drain pipe. The Contractor shall provide reducers as required to connect the 4” cleanout and the 2” pipe to the 8” drain line.

(10) Question: Sheet 6M-3, Plan 1 has 8” DD-Drain Line with Note to see Sheet C-6 for continuation see Sheet C-6 which shows pipe called out as D-Pipe. One is PVC Pipe and the other is CPVC. Which is correct? There is also 8” pipe running north and south on Sheet 6M-3, Plan 1. Where is it going?

Answer: Both drawings call for “D” pipe, which is PVC pipe and fittings. On Sheet 6M-3, the callout in Grid D-5 reads 8”-D-D, that is PVC drain line, not 8”-DD. CPVC pipe is not specified on this project. For line designation standard, see Sheet I-2, Grid J-4. The continuation of the 8” pipe running north and south is shown on Sheet C-6.

(11) Question: Section 02922, Paragraph 3.09B, references Section 02970. Section 02970 was not included in the bid documents. If this information applies to this contract, please provide such

Answer: Section 02970 is not required, and the references to Section 02970 were deleted in this addendum under Changes to Specifications.

END OF ADDENDUM