Addendum No 1 CIPP.pdf

Public Works

1370 W Black Bear Road, PO Box 397

Telluride, CO 81435

Addendum No. 1

2024/2025 CIPP Project

Town of Telluride, Colorado

1. Email Address of those that requested / accepted virtual Pre-Bid meeting invitation:

In person: Tracy Flint with C&L Solutions, and Mike with Iron Woman

Telluride, CO 81435

2. Bid Submittal: Public Works will not hold a public bid opening. Do not enter Bid into BidNet and refer to Advertisement and Invitation with respect to emailing Tara Ogren (togren@telluride-co.gov) your bid.

3. Bypass Pumping: Page 106 of pdf Bid Package (Section 3.6) shall be read as “BYPASS PUMPING – TO

BE PERFORMED BY THE CONTRACTOR.” Contractor shall be responsible for bypass pumping. Note that unit quantity has been changed from linear feet to days. Also bypass pumping line items are broken out for larger diameter and smaller diameter pipes.

Downstream Valley Floor 18-inch (plan sheets 2 & 3) peak flow conditions would be about 420 gpm.

Data taken from flowmeter in MH No. 5: Maximum day (between Aug 1 – Nov 31, 2023) was

September 16, 2023 at 401,000 gpd = 280 gpm x 1.5 = 420 gpm.

Upstream interceptor flows would comprise about half of downstream valley floor flows from Aug 1

– Nov 31. Higher flows are experienced December – March (ski season), and June – July (Festival

Season). For example, the upstream 18-inch interceptor (sheet 11 of plan set) was observed at approximately 20% full or 300 gpm on March 19, 2024, and at 150 gpm on September 11, 2024.

Bypass Pumping clarified submittal requirements are provided in Addendum No. 1.

4. Valley Floor Accessibility: The Valley Floor is most accessible August – mid late November (after monsoon Season and before snow accumulation). The Valley Floor is too wet and muddy for access during the Spring / early Summer. Coordination with Town Public Works and Town Open Space team is required to move CIPP equipment onto the Valley Floor. It is possible to coordinate early summer access (weather & access permitting); however Fall is the preferred timeframe.

5. Acceptable Manufacturers: On the condition that manufacturers and installers meet the criteria outlined on pages 20, 89, 90, 98, and 109 of the pdf Bid Package, then potential acceptable installers

(and manufacturers) to be interviewed and vetted prior to award would be United Felts EnviroCure, Pipelology, LLC, SAK Construction, LLC of Missouri, and BLD Services LLC.

6. Lateral Liners have been broken out for larger diameter and smaller diameter mainline connections.

Page 94 of pdf Bid Package (Section B: Liner Length 1 & 2) shall be read as “length of lateral liners shall be 24 to 36 inches.”

7. Warranty: page 109 of the pdf Bid Package (Section 3.13) shall include lateral liners. Additional cost for extended warranty shall be itemized upon Bid Award.

8. Force Account Line Item: Increased to $200,000

Telluride, CO 81435

9. Submittals: Submittals for Traffic Control and Bypass Pumping shall be coordinated and provided to

Public Works prior to the Notice to Proceed.

10. Outstanding Questions:

a. Is the bid alternate for laterals to be added to the total or separated from the total bid amount? Bid Add Alternate line items are optional. They are added separately as their own subtotal, then added to the Grand Total.

b. Is there any heavy cleaning anticipated? If so, can a line item be added? At the contractor’s recommendation and submittal of heavy cleaning equipment it is possible some areas of the DIP 18-inch pi

c. pe along the Valley Floor should receive additional cleaning; however, these lines were deep cleaned using a special mill machine in 2023 & 2024. If additional deep cleaning is recommended, demonstrated, and acceptable under the project contract, then this service will be paid under existing unit quantities and the “force account minor contract revisions” line item.

d. It mentions “2 separate hand delivered proposals” but wanted to verify 1 proposal via email is acceptable? correct

e. Can you clarify the bypass pumping requirement? Bypass is a requirement for every line segment to be lined but the quantity called out doesn’t cover the total footage. In addition, it mentions in the specs that the town will handle the bypass. Contractor shall handle all bypass pumping requirements. Bypass pumping on low flow 8-inch residential lines shall be evaluated versus simply plugging the line and notifying homeowners of shut-off period.

f. Is any specialty traffic control required such as flaggers or message boards? Message boards are not necessary. A traffic control plan for each zone will be required before start of work.

The contractor may employ flaggers temporarily if needed and in coordination with Public Works.

g. Ground water appears to be a huge concern on this project mainly on the 18”. Can a line item for chemical grout injection be added to address this concern as it could be a large added cost? A bid item example would be chemical grout injection per joint and per manhole. This would have to be evaluated as a change order request.

h. For the lateral liners, it sounds like the main concern is ground water. If heavy ground water is present, they will need to be chemically grouted before hand to stop infiltration. Would the town consider adding a line item for grouting laterals? From the CCTVs I have viewed there are trickles of water infiltrating into the joint at the lateral to main connection (not heavy). We are not likely to approve chemical grouting for the lateral liner.

i. During a site walk, some of the 18” manholes are fully in the water. Are there any environmental requirements or concerns with accessing these manholes? You have to access them from the bikepath. The environment here is a protected wetland, refer to the Bid Package for water pollution and environmental quality standards.

j. A transition liner from 8” to 10” isn’t typical. Would the town consider replacing the 8” with 10” so the entire pipe can be lined with 10”? If this is a proven method elsewhere and has passed the warranty period the Town will evaluate.

Telluride, CO 81435

k. Do we need to include costs to assume grout removal on Sheet 8 or will this be handled after the bid is awarded? If the awarded to contractor can not provide a method for removing the grout, then these segments (approximately 2 segments) will be eliminated from the contract.

l. Does the contractor need to include costs for specialty business coordination assuming that businesses are tapped into various line segments throughout town? The Bid Package addresses this question.

m. Are there any “no work” dates outside of the bluegrass festival? There are no “no work” dates specifically called out; however, a detailed project schedule must be coordinated with Public Work prior to start of work. There are residential parts of Town that the contractor could continue to work during Bluegrass Festival; however, work along the Valley Floor and areas of Town that are busier would not be approved during this busy 10-day long period.

n. Can quantity of lateral connections be added to the line segments per segment or listed?

Service connections are shown in the included CCTV Reports in the Bid Package. The laterals on the south side of Town and in groundwater would be prioritized if the Add Alternate is awarded.

o. Can you verify the length the lateral liner needs to extend into the service? Addressed above.

p. Do the lateral liners need to adhere to ASTM2561? ASTM F2561-11 references several complementing standards; one of which is ASTM F1216. The ASTM F1216 standard is referenced for purposes of tube design considerations for a CIPP. ASTM F1216 is not a lateral pipe standard and is not applicable to the sealing of lateral connections to mainline pipe and a branch pipe using CIPP. While ASTM F2561 is the industry standard for renewing lateral pipes and main/lateral connections with CIPP and pre-molded compression gaskets;

evaluation of acceptable manufacturers/installers will also include performance on previous projects, satisfactory references, and ability to meet the warranty requirements.

q. Can you please send the 18” videos to the dropbox link provided: yes, and see link to view only:

https://www.dropbox.com/scl/fo/wa1ocnj8plcxx3u6dwte7/ANdMwo3hBomYZH1EIbyPEmI?

rlkey=1v9l88o041vvuihquuuh7xat2&st=nowhlksb&dl=0

r. The condition of the asphalt is poor in some areas. Will the contractor be responsible for asphalt replacement or damage on the trail? Only if heavy equipment damages asphalt placed within the last 8 years will the contractor be responsible for asphalt replacement. Areas with poor condition asphalt will not require replacement if damaged during installation.

s. Please confirm contractor is allowed to release filtered water removed during the pipe vacuuming process back into the sanitary system? The filtered water or “decant” can be released back to the sewer with proper coordination with Public Works. Greasy lines from downtown restaurant area will have to be cleaned utilizing a plug or other method of grease capture (sheets 10-12 of plan set). Public Works facilitates jet cleaning and vacuuming twice a year of these areas, so extensive grease build-up is mitigated. Public Works can coordinate on a local dump site for grit (PW Facility) or excessively greasy decant water (frac tank at TRWWTP). No fees would be expected for utilizing Public Works’ dump sites if needed.

t. IF THERE IS STEAM or HOT WATER CURED CIPP LINING, also ask: Are there any well water areas, wetland areas, ground water or other sensitive environments proximate to the work area? If so, are there specific controls required to protect these areas such as “pre-liners”?

The Valley Floor 18-inch pipe section to be lined is in a protected wetland. If the contractor

Telluride, CO 81435 supplies the necessary submittals and formal recommendation to install a pre-liner, this may be evaluated using the force account line item and or a change order as necessary.

u. How is the CIPP LF to be measured for payment? From center of manhole to center of manhole is typical. That is acceptable.

v. Pre-Inspection and Cleaning is typically measured in the same manner as CIPP. Can this be clarified as well? Same answer for “v” above.

w. Will traffic control and permits for bypass be provided by the Town or does the contractor need to account for these costs? Public Works will require ROW Obstruction Permits for portions of the work. These will be no additional cost to the contractor (free).

x. If contractor is to include the cost of traffic control, please specify traffic control plan and duration for each planned site. Traffic control expectations are defined in the Bid Package.

y. Tube thickness design parameters and referenced specifications are provided. There is also a reference to the minimum thickness being 6 MM. Is the 6 MM thickness a reference to the cured/finished thickness or the nominal thickness of the liner prior to installation. Cured tubes of the same nominal thickness vary with installation circumstances. Often the thickness minimum refers to the nominal thickness of the tube with the acceptable finished thickness equal to or thicker than the design minimum. Please clarify. See page 92. Tubes shall be designed to achieve a finished minimum wall thickness of 6 mm. Any variation can be evaluated on a case-by-case basis.

Tara Ogren, P.E., CFM Town Engineer | Public Works 1370 Black Bear Rd., Telluride, CO 81435 Direct: 970-728-2169

Submittal Requirements and Special Specification for:

Bypass Pumping

1. DESCRIPTION

The work covered by this Item consists of bypass pumping operations to temporarily reroute sewer flows to prevent a sanitary sewage overflow (SSO) and to always provide adequate and reliable sewer flow during construction, while the tasked scope of work is executed. This Item includes all requirements for implementing a temporary pumping system for diverting sewage flow around any construction-related activity to an approved reintroduction point within the sanitary sewer system. Minimize the health, safety, and regulatory risks by taking all reasonable measures to avoid an SSO. Manage the flow of wastewater in a planned and proactive manner.

The flow data provided in the plans at each bypass pumping location provide the best-known sewer system flow information from which to develop the required bypass pumping plan (BPP). Depending on the complexity of the subject project, all available bypass pumping data are described in the construction documents, showing the possible connection or one or more impact locations for each bypass pumping area. The data must include:

wastewater flow information;

upstream and downstream manhole locations and depths, invert elevations, manhole and pipe diameters and materials, and any affected laterals; and a description of possible bypass pumping options and constraints.

Confirm that the bypass pumping flow data shown in the construction documents remain applicable by including updated flow information in the BPP. Provide monitored flow data back to the Public Works and the Engineer for analysis, using a technique first deemed acceptable to the Public Works and the Engineer. The monitoring flow data must be obtained before the actual bypass work that accommodates the identified scope of work reflected in the Contract documents.

Do not proceed with any work until the Public Works and the Engineer have reviewed and commented on the measured flow data. In the absence of any flow data furnished in the construction documents, the submitted monitored flow data are the only means to incorporate the to-be-submitted BPP for review and acknowledgment.

2. SUBMITTALS

Submit manufacturer’s product data, instructions, recommendations, shop drawings, and necessary certifications for the proposed BPP to be reviewed and acknowledged.

For each area requiring bypass pumping, prepare and submit a BPP. The BPP must be submitted at least 4 weeks before beginning any portion of the proposed scope of work.

The following must be submitted as part of the BPP.

A cover letter containing the following information.

• The project name and job number.

• The name and address of the Contractor.

• Contact information of the project manager, superintendent, foreperson

(supervisor), and safety professional.

• A description and location of the planned bypass pumping work to be performed.

• Emergency (“24/7”) contact information for the bypass pumping subcontractor, if applicable. Include the name, telephone number, and title of the person or persons onsite responsible for the bypass pumping operation.

The name, telephone number, title, and signature of the person preparing the BPP.

A description of how the maximum amount of sewer flows to be bypassed was obtained (including all flow measurement devices, calculations, equipment, or other sources of how data were obtained).

Descriptions of all proposed bypass pumping components to be used. If applicable, describe all various bypass pumping phases. Include bypass pump size and capacity, as well as the size and capacity of the suction and discharge piping. The description must also include manhole or structure depth and size used during the bypass pumping operation; sewer plugging method and type of plugs used; flowmeter installation locations; staging area for pumps; and calculations of static lift, friction, and flow velocity.

The date and time the bypass pumping is expected to begin and be completed.

Indicate whether bypass pumping is outside normal workhours (8 A.M.–5 P.M.).

The pump curves, showing operating range. This information must include the proposed system curve, addressing the pump operation in relation to the suction and discharge piping alignments with respect to restriction and elevations. Also include back-up pump, power, and piping equipment.

Suction and discharge piping material and capacity used for the bypass pumping operation, including the material for any bends and valves used.

A sketch showing the location of the pump or pumps and the route of the suction and discharge pumping. If the route is different from what is shown in the construction documents, the new sketch must be dimensioned with all-inclusive Public Works manhole numbers used for suction and discharge operations. If any other structure is used for suction or discharge operations, then the nearest manhole or manholes must be labeled. The sketch must include the name of any streets and major intersections in the area. All features possibly affected by the alignment of the BPP’s components (e.g., driveways, vehicular traffic, and residential or commercial dwellings [due to noise]) must likewise be addressed.

Sections showing suction and discharge, pipe depth, embedment, select fill, and special backfill if buried.

Clear photographs of manhole interiors used for the bypass pumping operation.

Temporary pipe supports and anchoring, thrust and restraint block sizes and location, and sewer plugging method and types of plugs.

A traffic control plan pertinent solely to the bypass pumping operations. This plan may differ from the project’s traffic control plan for the overall scope of work. Maintain pedestrian and vehicular traffic and comply with Americans with Disabilities Act regulations for access to all residential and commercial property unless written approval is otherwise obtained from the property owner allowing for reduced access. The Engineer primarily requires a review and approval of this plan.

An emergency plan detailing procedures to be followed if any portion of the bypass operation fails and causes either surcharging or an actual SSO.

Contractor is herein advised that any surcharging of the sewer flows during bypass pumping operations will be deemed a failure of BPP, and the Contractor must repropose an improvement to their BPP for review and acknowledgment. A sanitary sewer surcharge is herein defined as any bypassed flows entering the manhole or structure (above the crown of the pipe), due to lapses in the Contractor’s BPP.

Method of noise control for each pump and generator. Noise generated by the pumps and equipment must be limited to at most 70 decibels A-weighted average when measured at 30 ft. from the pumps and equipment running at 50% of full-throttle power.

3. EQUIPMENT AND MATERIALS

Provide all necessary pumping equipment, piping, and all other necessary appurtenances to maintain adequate and reliable sanitary sewer flow in the sewer system during construction. All materials and equipment must be in good condition, and should not have visible damage such as cracks, holes, foreign material, or blisters.

3.1. Piping. Discharge and suction piping must be approved by the Public Works and Engineer. Discharge piping is determined based on bypass flow calculations and system operation calculations. Suction piping is determined based on pump size, bypass flow, and manhole depth.

High-density polyethylene (HDPE) must be homogenous throughout, free of visible cracks, discoloration, pitting, varying wall thickness, blisters, or other defects.

HDPE pipe must be assembled and joined using couplings, flanges, or fusion welding to provide a leakproof joint. Follow manufacturer’s instructions and ASTM D2657.

HDPE fusion welding must be performed by personnel certified as fusion technicians by the manufacturer of HDPE pipe or fusing equipment.

BPP must indicate the proposed dimensional ratio of the pipe used.

Pipe material other than HDPE must be submitted to the Engineer for approval.

Neither “irrigation-type” pipe nor glued polyvinyl chloride pipe is permitted.

3.2. Plugs. Plugs must be selected and installed according to the size of the line plugged. An additional plug must be onsite and ready to be installed if a plug fails or becomes dislodged. Plugs will be reviewed by the Inspector for defects that might lead to failure before being installed. Notify the Inspector at the completion of the work to verify that all plugs have been removed from the system.

3.3. Pumps. Pumps must be fully automatic self-priming units that do not require the use of foot valves or vacuum pumps to prime the system. No electric pumps are allowed; all pumps must be diesel-powered. The primary pump must be a grinder or chopper pump, to reduce the potential for debris to complicate the safe operation of the pumps. Have one backup pump, equal in capacity to the largest pump in the system, connected to the bypass pumping system, and ready for operation in case any of the primary pumps fail. The backup pump must not be used in Contractor’s calculations for determining the pumping capacity requirements for the stated flow conditions above. Sound-attenuated pump enclosures are required on all bypass pumping operations.

4. TESTING (QUALITY CONTROL)

Prove to the owner that the equipment, materials, and all operational aspects and appurtenances related to the BPP are in good condition before commencing the bypass pumping operation. Failure to do so will result in not being permitted to continue with any construction work requiring bypass pumping operations. Notify the Public Works representative 48 hr. before beginning any testing. Any flows surcharging the sanitary sewer system during the test or during actual bypass periods will deem the BPP to be unacceptable and must be revised and resubmitted for approval. There will be no separate pay item if this condition occurs during the timeframe in which bypass pumping test or operations are underway during the project.

Discharge piping, joints, and all accessories will be required to be either air- or hydrostatic-tested. If hydrostatic testing is proposed, all piping, joints, and accessories must be able to withstand at least twice the maximum system pressure or at least 50 psi, whichever is greater.

For any bypass operations proposed to be conducted during normal business hours only (8 A.M.–5 P.M.), a test run of at least 2 hr. must be satisfactorily performed, before beginning any construction work. For a bypass pumping operation that will be required to run continuously (24 hr.) and over multiple days, a 24-hr. test run must be satisfactorily performed before beginning any construction work. In both cases, the Inspector must provide acknowledgment first. Provide a strobe-light type high-level alarm, as well as alarm notification to cell phones, and other appointed personnel identified by the Public Works, and ensure adequate alarm notification is attained before actual startup of the test period.

During the testing period, install a float monitoring system in the upstream manhole or pipe to confirm that the bypass pumping flow data shown in their BPP remain applicable. The float monitoring system must remain in the manhole or pipe throughout the bypass operation. The data collected during the test and duration of the bypass operation must be provided to the Public Works for evaluation and recording. Have personnel remain onsite at the flow monitoring system to continuously record (every 30 min.) the flows during the test and actual bypass pumping periods.

Any failure of equipment, or activities associated with the bypass pumping operations contributing to either a surcharge or SSO, will be deemed a failed test.

The test will then be stopped and any necessary cleanup or reporting efforts performed. The BPP will need to be revised, resubmitted, and acknowledged before the test initiating again. Any effort by the Public Works or other third parties to mitigate damages resulting from any surcharging or SSOs must be the direct and sole responsibility of the Contractor, including any related fines, penalties, or damages.

5. CONSTRUCTION

During construction, the Contractor is responsible for always maintaining a safe and secure environment. All provisions and requirements of the BPP must be followed throughout any bypass flow operations. Notify the Public Works representative 72 hr. before beginning the bypass pumping operations.

Have full-time (24-hr.), onsite qualified pump personnel, including supervision, for monitoring the entire bypass installation while it is in operation. The entire length of bypass piping will be walked and inspected hourly to monitor for leaks. High-level alarm notification to cell phones will not eliminate this requirement.

Before installing any plugs, inspect the existing pipe for imperfections that might cause damage to the plug, cause the plug to not seal and function properly, or compromise the integrity of the pipe when the plug is inflated. The results of this inspection will directly impact the planned plugging location or locations. Afford the Inspector an opportunity to confirm that the plug location is acceptable.

Lines inserted into any manholes or structures must be constructed with elbows, or be otherwise angled, to direct discharge along the most efficient path for entry into the downstream line without causing unnecessary turbulence of flow. The termination point of the discharge piping must extend to the crown of the pipe housed within the manhole or structure receiving the bypassed flows.

Provide continuous-supply onsite fuel storage for 24-hr. operation of the bypass pumping installation.

Protect all components of the bypass operations from vandalism and vehicular damage by making the site secure.

Minimize sewer odors by using lids, shroud covers, or any method approved by the Inspector or Engineer.

Be solely responsible for all damages to private or public property caused by, or during, the installation, operation, and removal of the bypass pumping system.

Once all work is completed and the bypass pumping operation is no longer required, drain the entire sewer system flow into an existing City sanitary sewer manhole before disassembly and removal of the system from the construction site. The intent is to prevent spillage of sewage.

6. MEASUREMENT

This Item will be measured per day for each bypass pumping location.

7. PAYMENT

The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Bypass Pumping.” This price is full compensation for furnishing materials and for any preparation; for hauling, placing, and joining of pipes and fittings; for maintenance and subsequent removal of the bypass system; and for other materials, labor, equipment, tools, and incidentals.

Per-day payment bid for bypass pumping will be in accordance with the following.

Any effort for per-setup location and operation will be included in the per-day price per each bypass location.

When initial setup and operation of the bypass pumping system begin

(including flow monitoring, successful test, and installation of traffic controls if needed), 20% of the per-day cost will be paid.

Sixty percent of the per-day cost will be paid over equal monthly payments (estimated from the BPP or other documentation approved by the Inspector) during bypass pumping operation.

Twenty percent of the remaining per-day cost will be paid upon an acceptable removal or disassembly of all components of the BPP, including site cleanup.

Any damages and repairs to private or public property will not be considered for any additional payment.