Construction Progress Report September 2008

Wet Weather Improvements Project Central Marin Sanitation Agency

Table of Contents

Section 1 WWIP Executive Summary

Section 2 WWIP Project Photos

Section 3 Logs

Section 4 Outfall Project Update

Executive Summary

Contract Number 07-01

General Contractor Western Water Constructors

Contract Bid Amount $35,550,000.00

Change Orders to Date 6, plus one Extra Work Order

Pending/Anticipated Change orders 8 items

Notice to Proceed October 8, 2007

Original Contract Time 910 calendar days

Working Days Elapsed 359

Working Days Remaining 551

Milestone 1 (CCT & EPS) July 29, 2009

Milestone 2 (All other work) March 6, 2010

Rain days – Accepted to date 7 of 50 included within contract time

Contract Change Order(s) Time Extension 0

Final Completion Date April 5, 2010

Total Project Time Expended 39.5%

Total Project Cost Expended 51.9% Work Progress during September 2008 by Area or System: 1. General:

The Agency issued an Extra Work Order to Western Water Constructors for the procurement of the Headworks Bar screen replacement project’s equipment. This new equipment will improve removal of unwanted solids material from the wastewater stream, reducing the solids load on the downstream treatment processes and will reduce odors from the screened material. The August 2008 monthly schedule update was submitted and reviewed. Some changes to the project activity sequences were noted. Western Water updated the testing and start up dates for the equipment for the work being coordinated with the SCADA programmers, Carollo Systems, Inc. Western Water (WW) refreshed the SWPPP best management practices (BMPs) for dry weather. Due to several months of dry weather, no storm inspection reports have been submitted this month. In early October, Western Water plans to check and repair, as needed the SWPPP BMPs in anticipation of rainy weather. Western Water continues routine weekly safety tailgate meetings, weekly safety checks, as well as the monthly safety audit performed by WW’s safety officer. Written reports of all meetings, checks and safety audits have been submitted for the record.

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2. Polymer Facility: Western Water completed the concrete work of the stairs and equipment pads for the polymer storage tank, progressing cavity pump and two polymer activation units. The v-ditch was formed and concrete placed at the south end of the truck loading pad and the south and west sides of the polymer facility. The north sidewalk and south stair landing were also formed and concrete placed. The 2,000-gallon tank (TNK50.1), which will store the polymer, has been delivered to the project. This tank will be set in place after the concrete area has been coated.

3. Gallery A & B Improvements, including Grit Chamber 3 and Headworks

Western Water completed most of the demolition work of the primary influent channel in preparation for the connection to new primary clarifiers 6 & 7. This demolition included removal of the east half of the south wall of Gallery ‘A’. They also built and sealed a bulkhead in the influent channel between Primary Clarifier Gates 1A and 1B. The bulkhead will allow use of Primary Clarifier 1 during wet weather while the influent channel extension is being constructed. The formwork shoring was extended over the stairs to provide an appropriate work area for the demolition and concrete formwork, which will support the primary influent channel. This formwork will remain in place until the concrete work in this area is completed. This area is cordoned off with caution tape due to the demolition work. Grit Classifier, GC4.5, was placed in the Grit Handling Room in late September. Installation of the classifier and piping will begin in October and may continue into November.

4. Primary Clarifiers 6 & 7 Western Water completed placement of the concrete slab at elevation 99, connecting to the existing Gallery A floor. Reinforcing steel and formwork for two wall sections have been prepared for concrete placement on Wednesday, October 1.

5. Chlorine Contact Tanks (CCT) 5 & 6 Western Water completed concrete placement for the remaining Chlorine Contact Tank wall sections. Their subcontractor, Patent, began setting scaffolding and deck forms for the tank walkways. Reinforcing steel is being placed in the formed walkways and concrete placement for the walkways is scheduled for early October. Lighting and receptacle conduits are being installed in the walkways also. Western Water excavated on the north side of the effluent pump station and installed approximately 180 feet of 72-inch RCCP gravity effluent pipe. This line connects the new chlorine contact tanks to the existing chlorine contact tank. Western Water installed a bulkhead in the existing chlorine contact tank effluent sump and removed a portion of the concrete wall where the 72-inch line will connect to the sump. Western Water plans to complete the installation of the 72-inch pipeline and sluice gate in October provided the weather cooperates. The bulkhead will allow complete removal of the south CCT wall section for installation of the sluice gate, which the plant is in operation.

6. Effluent Pump Station (EPS) With the deck shoring for the effluent pump station in place, subcontractor Pacific Coast Steel installed the bottom mat of reinforcing steel for the pump service level at elevation

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117.00, leaving openings for the vertical propeller pumps. Subcontractor, Aspen Timco completed placing approximately 85% of the electrical conduit runs in the deck area. The conduit runs and top mat of reinforcing steel will be completed in early October. Concrete placement is contingent upon approval of the effluent pumps, which are in submittal review.

7. Site improvements Western Water completed the installation of the concrete thrust block around the 84” x 66” wye connection. They also installed the 66-inch pipeline from the wye connection to the valve vault, and installed the expansion joints on either side of the vault. This area was then backfilled and compacted. Western Water placed the footings and began forming the stairs and landing around the methane gas burner. This work is expected to be completed in early October.

8. Aeration Tanks No work was done in this area during the month of September. The electrical subcontractor, Aspen Timco will submit a proposed routing plan with details for the Agency’s review.

9. Review Item Summary

Please see attached open RFI and Submittal logs in Section 3 for details of the following outstanding items.

Review Items Total Received to Date

Number Received in September

Number Returned / Reviewed in September

RFIs 110 11 7 Submittals 258 9 25 Certified Payroll 276 24 24

10. Change Order Summary

Approved Change Orders Description Cost

Contract Change Order No. 001 One-time relocation of PG&E gas Line $0.00

Contract Change Order No. 002 Miscellaneous Small Changes (9 items) $1,043.00

Contract Change Order No. 003 Miscellaneous Changes (8 items) $40,403

Contract Change Order No. 004

Secant pile retaining wall additional work over Ross Valley Interceptor per Design Clarification No. 002, performed on time and material.

$54,228

Contract Change Order No. 005 Miscellaneous Changes (11 items) $11,249.00

Contract Change Order No. 006 Small Changes (7 items) $22,182.00

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Extra Work Order No. 001

Purchase and delivery of Perforated Plate Screens and Screenings Washer Compactors. Purchase and installation of roof skylights

$764,006.00

Pending Change Orders Description Action

Issue #1 / COR #037

Additional cost for Specification 06612 FRP Baffle not included in bid documents. $7,073.00

Pending negotiation

Issue #56 / COR #038 Price quotation to paint existing grit equipment: $16,175.00

Pending Agency decision

Issue #080 / COR #040

Material cost for replacement piece used by Agency staff: $204.00

Pending negotiation

Issue #082 The CCT scum line location on the plans conflicted with the paving plan. Revised direction to install this line underground has been issued to Western Water.

Cost proposal

requested.

Issue #085 The Agency has decided to add the fifth effluent pump (P20.1).

Cost proposal

requested.

Issue #087 Upon review of the fuel system for the diesel engines through the RFI process, Carollo Engineers recommended a size increase for the fuel oil supply and return lines.

Cost proposal

requested.

Issue #089

Upon review of the new Remote Terminal Unit (RTU4.2) enclosure, the Agency would like to consider an alternate enclosure, which would allow easier access to the terminal panels and I/O boards.

Cost proposal

requested.

Value Engineering Items

Excavation and Shoring Changes at Chlorine Contact Tank Area: Western Water proposed an alternate method to excavate and place the controlled low strength material in the chlorine contact tank area. This method was accepted by the Agency. The Agency and Western Water will share the cost savings of this method.

Pending Savings to be

determined

10. Apprentices

Eight apprentices (one electrical, three general laborer, three carpenter and one reinforcing steel) worked on the project throughout the month of September.

Work Activities planned for October 2008:

• Complete Effluent Pump Station pump service level concrete placement • Complete installation of 66-inch pipeline from Effluent Pump Station to Valve Vault • Complete installation of the 72-Inch effluent line and Sluice Gate at existing CCT sump • Complete concrete placement of elevated walkways for Chlorine Contact Tanks • Form and place slab and walls for the Primary Clarifier Influent Channel • Continue wall placement (form, reinforcing steel and concrete) at the Gallery A

Extension • Begin installation of mechanical equipment. • Continue to Procure Material and Equipment • Continue to receive equipment (Pumps, Valves, etc.) • Submittals provided for review, including schedule update.

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Wet Weather Improvements September 2008Photos taken 09.30.08

Progress Photo 01 - Overview of Valve Vault and backfill over Outfall Wye Connection Area

Progress Photo 02 – 72-Inch Pipeline from Effluent Pump Station Drop Inlet to existing

Chlorine Contact Tank

Wet Weather Improvements September 2008Photos taken 09.30.08

Progress Photo 03 – Overview of Effluent Pump Station from East

Progress Photo 4 – Effluent Pump Station with bottom mat reinforcing steel and conduits.

Wet Weather Improvements September 2008Photos taken 09.30.08

Progress Photo 05 – Chlorine Contact Tanks – Elevated walkways formed

Progress Photo 06 – Chlorine Contact Tank Interior – Overview from the west

Wet Weather Improvements September 2008Photos taken 09.30.08

Progress Photo 07 – Overview of New Primary Clarifier Area

Progress Photo 08 – Gallery A Extension Wall Sections formed

Wet Weather Improvements September 2008Photos taken 09.30.08

Progress Photo 09 – Gallery A Extension at Elevation 99.00

Progress Photo 10 – Wall Demolition for Gallery A Extension and Primary Influent Channel

Wet Weather Improvements September 2008Photos taken 09.30.08

Progress Photo 11 – Polymer Facility –Equipment pads and v-ditch

Progress Photo 12 – Forming for stairs and landing at Methane Gas Burner

V-Ditch Equipment Pads

CMSA - Wet Weather Improvement

Job No:Project No: Page:Page: 1 of 11 of 1

Date: 9/30/200807-01061-0491.01

Open Requests for Information

Status Request Dated Responded RequiredIssueRFI Number From To TitleChange

Central Marin Sanitation Agency

9/23/2008 9/25/2008Drawings M-20.2 and M-20.3 show the Fuel Oil Supplyand the Fuel Oil Return piping at the Effluent PumpStation. It is not clear what is being asked for in thisarea. See the attached drawings primarily the areasclouded in red. Please clarify and provide more detailfor what is shown in these drawings so that I can orderthe correct materials.

Harris Comment: The plan view is confusing as thesupply line looks like it is coming out of the FO-R,although the line is not shown as being in the concrete.An elevation of the day tank would be helpful if possible,or name the four line that are coming-out of the daytank. Also a review of the day tank submittal, SubmittalNo. 229, may be helpful. The engine FO-R line appearsthat it is returning to the day tank and not the main fueloil tank. Would a change on this line be something wewant to consider?

OPN00107 WESTWATR HARRIS Day Tank layout

9/29/2008 9/30/2008Per Section 16133 - 2.02.D we are to install a type "D"expansion fitting at structural expansion joints. PerSection 16133 - 2.02.D we are to install a type "AX"expansion fitting where we cross an expansion joint withexposed conduit. We agree that this is the properinstallation.

However, Detail EM121 on Drawing TE5 indicates thatwe are to install both types of expansion joints in astructural slab. The use of the type "AX" expansionfitting encased in concrete will defeat the purpose of theexpansion joint since the concrete will allow for nomovement of the type "AX" fitting.

Proposed Solution: Install the type "D" expansion fittingsin the structural slab per the manufacturer's details (seeattached RFI No. 108 Supplemental - Expansion FittingsCut Sheets) and per Section 16113.

OPN00108 WESTWATR HARRIS Electrical Expansion Fittings

9/30/2008 10/3/2008Per conduit schedule E1.39 there is a conduit called outas 20-S046D, which is a ¾”C with 1 cat5e cable thatgoes from IPB-07 to a telephone cabinet on contractdrawing E20.11. Nowhere on Contract Drawing 20.11do we find a telephone cabinet or conduit 20-046D.Drawing 20.11 has IPB-07 but there is no conduit withthis call out coming from this PB.

Please provide details on the routing of this conduit andthe location of the telephone cabinet.

OPN00109 WESTWATR HARRIS Telephone Cabinet for20-S046D

9/30/2008 10/3/2008On Drawings S-5.3 and S-5.8, the plans show sectionviews of the Primary Clarifier grit hoppers. We wouldlike to add additional vertical construction joints andkeyways at the grit hoppers to ensure a good finalproduct. Please see the attached supplemental drawingsfor locations.

We propose to form and place the vertical walls withkeyways around the grit hoppers without forming for thesloped concrete section. After stripping the verticalwalls we would form for the infill concrete at the grithoppers and place all of the sloped infill concrete on thesame day. We would also like to eliminate the slabrebar that is shown in these drawings. We have filledthe voids at the grit hoppers with CLSM instead of sand.

OPN00110 WESTWATR HARRIS Construction Joints at PC 6 &7

Report r_a_rfi_03_harris

Item No.

CMSA - Wet Weather Improvement

Open Submittal Log - Sorted by Submittal No.

Project No:Job No: 07-01

061-0491.01 Page:Date: 9/30/2008

1 of 1

Submittal TitlePackage Rev. FinishRequired

Status Rcvd. Sent Return Forward BICLatest Dates

Central Marin Sanitation Agency

247 Reinforcing Steel - EPS Upper Slab03200-EPS Upper 03200 001 R&R 8/18/2008 8/19/2008 9/5/2008 WESTWATR9/8/2008

258 Reinforcing Steel - PC Blending Chn03200-PC Blend 03200 001 OPN 9/30/2008 9/30/2008 CAROLLO

253 Reinforcing Steel - PC Upper Slab03200-PC Up Slb 03200 001 R&R 9/2/2008 9/3/2008 9/17/2008 WESTWATR9/23/2008

256 Cementious Material for Gate Thimbl03926-1.04-A 03926 001 R&R 9/26/2008 9/26/2008 9/29/2008 WESTWATR9/29/2008

244 Reglet & Counter Flashing07600-1.03-A 07600 001 R&R 7/29/2008 7/29/2008 9/5/2008 WESTWATR9/8/2008

137 Pressure Gauges & Switches103424-2.04 13424 001 R&R 7/29/2008 7/29/2008 9/4/2008 WESTWATR9/4/2008

246 Vertical Propeller Pump - Prime Pum11312D-1.05 11312D 002 OPN 9/30/2008 9/30/2008 CAROLLO

210 Submersible Sump Pump11312J-2.01-B1 11312J 002 R&R 8/13/2008 8/13/2008 9/29/2008 WESTWATR9/30/2008

229 Diesel Engine Drive System11318-1.04A,B,G 11318 R&R 8/28/2008 8/28/2008 9/16/2008 WESTWATR9/17/2008

190OM Grit Classifier System - O&M Manual11323-1.05-G 11323 001 OPN 8/22/2008 8/25/2008 CAROLLO

212 Helical Scum Skimmers11343-1.04 B-D 11343 001 R&R 3/27/2008 3/31/2008 4/28/2008 WESTWATR4/29/2008

207 Polymer Activation Unit11347-1.04-B&C 11347 002 R&R 8/26/2008 8/26/2008 9/29/2008 WESTWATR9/30/2008

236 Chemical Induction Mixer11348-1.04 11348 002 OPN 9/4/2008 9/9/2008 CAROLLO

189 1.04-A Product Data11351-001 11351 002 R&R 6/10/2008 6/11/2008 9/8/2008 WESTWATR9/9/2008

189 1.04-B Shop Dwgs. & Calculations11351-002 11351 002 R&R 6/10/2008 6/11/2008 9/8/2008 WESTWATR9/9/2008

189 1.04-C Manufacturer's Dwgs11351-003 11351 002 R&R 6/10/2008 6/11/2008 9/8/2008 WESTWATR9/9/2008

189 1.04-D.2 Manufacturer's Instruct.11351-004 11351 002 R&R 6/10/2008 6/11/2008 9/8/2008 WESTWATR9/9/2008

189 1.05-A.2 List of Installations11351-005 11351 002 R&R 6/10/2008 6/11/2008 9/8/2008 WESTWATR9/9/2008

189 1.08 Warranty11351-006 11351 002 R&R 6/10/2008 6/11/2008 9/8/2008 WESTWATR9/9/2008

189 1.09-B.2 Spare Parts List11351-007 11351 002 R&R 6/10/2008 6/11/2008 9/8/2008 WESTWATR9/9/2008

163 Above Ground Fuel Storage Tank13209-1.04 13209 003 R&R 7/15/2008 7/16/2008 9/29/2008 WESTWATR9/30/2008

245 Fire Alarm - Product Data13851-1.08-B 13851 001 R&R 8/5/2008 8/6/2008 9/29/2008 WESTWATR9/30/2008

245 Fire Alarm - Shop Drawings13851-1.09-B 13851 001 R&R 8/5/2008 8/6/2008 9/29/2008 WESTWATR9/30/2008

034OM Butterfly Valves - O&M Manuals15112-1.05-F 15112 001 R&R 6/10/2008 6/11/2008 6/30/2008 WESTWATR7/3/2008

250 Control Valve for Solenoid15117-2.06 15117 001 OPN 8/20/2008 8/20/2008 CAROLLO

254 Metal Ductwork15812-1.04-C.1 15812 001 OPN 9/4/2008 9/9/2008 CAROLLO

129 Type 1, Down Blast Centrifugal Roof15830-2.01 15830 003 OPN 6/25/2008 7/1/2008 CAROLLO

129 Type 2, Up-Blast Centrifugal Roof15830-2.02 15830 003 OPN 6/25/2008 7/1/2008 CAROLLO

129 Type 3, In Duct Fan15830-2.03 15830 003 OPN 6/25/2008 7/1/2008 CAROLLO

226 Air Handling Units - Shop Drawings15855-1.04-A 15855 001 R&R 4/17/2008 4/18/2008 5/19/2008 WESTWATR5/20/2008

201 Disconnect Switches16144-1.02-A 16144 002 OPN 9/18/2008 9/18/2008 CAROLLO

200 Low Voltage Distribution Transform16273-1.03-A 16273 001 R&R 3/12/2008 3/13/2008 4/1/2008 WESTWATR4/3/2008

231 600V Motor Control Center - Shp Dwg16342-1.04-A 16342 001 R&R 4/29/2008 4/30/2008 6/2/2008 WESTWATR6/3/2008

230 Lighting - Product Data w/Seismic16500-1.03-A 16500 002 R&R 8/5/2008 8/6/2008 9/4/2008 WESTWATR9/8/2008

Report r_sb_01_c_01

Outfall Improvements Project 08-01 Executive Summary

Contract Number 08-01

General Contractor Underwater Resources, Inc.

Contract Bid Amount $521,289.00

Change Orders to Date 0

Pending/Anticipated Change orders 0

Notice to Proceed June 12, 2008

Original Contract Time 100 calendar days

Working Days Elapsed 111

Working Days Remaining 0

Contract Change Order(s) Time Extension 11

Final Completion Date September 25, 2008

Total Project Time Expended 110.0%

Total Project Cost Expended 100 % Summary of Work Progress for Outfall Improvements Project:

URI completed the installation and testing of the remaining contract seals on September 22, 2008. During the course of the work, URI had observed a crack in the existing pipe approximately 100 feet from the submarine outfall entry point and provided a video on DVD of the apparent damage. This information was reviewed by Carollo Engineers. URI provided further cleaning and inspection of the crack. On September 25, URI repaired the crack by pressure washing the area to remove loose debris, packing the crack with underwater grout (by Subac) and layering in a section of 316 stainless steel mesh over the widest portions of the crack. This area was then covered by an extra wide seal. Final documentation and acceptance of the project is scheduled for October.