B09_Q_A_YOSE_215363_Replace_TM_WWTP_20251222_R2_0004.xlsx
XLSX spreadsheet 46 KB Posted
- Attached to
- YOSE 215363 - Replace Tuolumne Meadows WWTP
- Solicitation number
- 140P2026R0001
About this file
The document is a Questions and Answers (Q&A) file for the Yosemite National Park (YOSE) 215363 project to replace the Tuolumne Meadows Wastewater Treatment Plant. The file contains 12 technical queries and responses addressing detailed specifications for the project, including piping materials, valve types, duct insulation, penetration methods for pre-cast structures, and pipe schedule clarifications. The responses provide specific guidance on material selections, such as confirming ductile iron for sanitary sewer pipes, PVC pipe specifications for different water systems, and insulation requirements for HVAC ductwork.
The contract opportunity is managed by the Department of the Interior National Park Service National Office, with the solicitation number 140P2026R0001. The project involves comprehensive replacement of the wastewater treatment system at Yosemite National Park in California, with the Q&A document serving to clarify technical specifications and ensure precise implementation of the construction and infrastructure requirements. The responses demonstrate a detailed approach to resolving potential ambiguities in the project's technical documentation, covering aspects ranging from pipe materials and valve types to insulation and penetration methods for various structures.
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Sheet1
| # | YOSE 215636 Replace Tuolumne Meadows Waste Water Treatment System RFI | ACTION | RESPONSE |
| 1 | Drawing 01G025 Piping Schedule appears to have several system and material details cut off or missing. Please provide the complete pipe schedule. | AE | A/E version of the drawing do not show any items missing or cut off. |
| 2 | 09 96 00 - Please confirm if rigid galvanized conduit is to be painted or coated. | AE | Refer to the Material Selection Table on Drawing 01G028 for RGC coating requirements for each type of area conduit is installed in. |
| 3 | Factor 4 states to submit schedule in MS Project Gantt Chart format. Would it be acceptable to submit the baseline schedule in Primavera? | DSC | Yes, but a PDF print out is required. |
| 4 | The Pipe Schedule calls out SS Sanitary Sewer Buried Pipe to be Ductile Iron, Bell and Spigot Joint that is Gravity. Per Specification section 33 41 01 Storm Drain Sanitary Sewer and Drainage Piping, it states for Pipe and Fittings to be specified in the Data Sheets following "End of Section" The data sheets call out to be Polyethylene (PE) Profile Wall (Spec Section 33 41 01.07). Please confirm what is the material of the Sanitary Sewer pipe. | AE | Ductile iron is the correct pipe material for SS service as indicated on piping schedule, see data sheet spec section 40 27 00.01, Cement Mortar and Ceramic-Epoxy-Lined Ductile Iron Pipe. Defer to spec section 33 41 01 for storm drain piping. |
| 5 | On Sheet 25D302 General note 2 States "ALL BELOW GRADE PIPES MUST BE ENCASED PER DETAIL 0330-016" Does this general note apply to all of the Pages? Please confirm if all Below grade pipes need encasement per Detail 0330-016. | AE | The note applies to all process pipes installed in Facility 25 that are located underneath the building. This note does not apply to pipes shown on plumbing drawings, however any plumbing pipes may be encased if desired by the Constructor. |
| 6 | On Sheet 04Y130, Key Note 9 calls out for 3 locations to be Restrained Ball Valves V300. The drawing symbol for the Valve is shown as a Gate Valve. Please confirm if this is a Ball Valve V300 or a Gate Valve. | AE | Provide valves as noted and listed in the drawing Keynotes. Provide threaded unions on upstream and downstream side of each ball valve. |
| 7 | On Sheet 10SD140, they show a 4" RW pipe from the RV Dump station that will go towards the Influent Pump Station. On the yard drawings such as Sheet 04Y130 it call's out the pipe to be a 4" SS. The same goes for the 12" SS from MH-7 to Influent Pump station which is called out as a 12" RW on 10D140. Please confirm correct pipe system, and material for the pipe. | AE | SS is the correct flow stream for the 4" piping between the RV dump station and the influent pump station, as well as for the 12" piping between MH-7 and the influent pump station. |
| 8 | Drawing 10D140 references Wall Pipe Penetration Details 4027-605 for the SST piping and 4027-607 for the PVC piping penetrating the pre-cast Influent Pump Station. Both of these details specify wall spools/sleeves with weep rings that are typically used in cast-in-place concrete structures. Since this structure is pre-cast, please provide an alternative detail, or guidance, for penetrations into pre-cast structures, such as utilizing a core-drilled penetration with a modular mechanical seal, or a core drilled penetration and grout as shown on detail 3305-730. Please confirm if either a core-drilled hole with link seal or a core-drilled hole with grout is acceptable for the pipe penetrations into the pre-cast Influent Pump Station structure. | AE | Provide link seal at wall pipe penetrations at the influent pump station per detail 4027-607, with the exception of the pipe sleeve with weep ring shown on exterior of link seal. All cored holes for penetrations shall be smooth-walled for link seal installation per manufacturer's direction and properly sized to match link seal outer diameter. |
| 9 | Note 1 of HVAC Drawing 50M130 says to internally line 18" round duct. Note callout is pointing to a duct that has a callout for 16x12 rectangular. Which size and type of duct is correct? | AE | Provide 16" x 12" rectangular duct. |
| 10 | Spec section 23 07 00 calls for mechanically cooled and heated duct to be insulated. Drawing 50M130 is unclear as to what type of insulation method is to be used particularly in the operations building outside of the process area. Please clarify if insulation is required, and if it is external or internal for supply and exhaust ductwork for all buildings with ductwork. | AE | Install Type D5 internal lined insulation, 1-1/2" thick, on air supply ducts in Facility 25 and Facility 40. Install Type D1 blanket insulation, 1" thick, on heated supply ducts in Facility 50 (electrical room and non-process areas). Insulation is not required on any other ducts. |
| 11 | Buried System W3 on the Pipe Schedule calls for the material to be PVC, SCH 80. The schedule also refers to specification Section 33 05 01 (Conveyance Piping - General). Specifications 33 05 01.09 for PVC call's out for PVC, C900 DR 18. Since W3 piping is 3" and smaller, please confirm that schedule 80 PVC will be utilized for buried W3 piping. | AE | Buried and encased piping (3" and smaller) should be sch. 80 PVC with solvent-welded joints. Defer to piping datasheet 40 27 00.10 instead of 33 05 01. |
| 12 | Buried W1 System on the Pipe Schedule calls out for ALL buried piping to be PVC, SCH 80 but refers to Specification Section 22 10 11. There is no Specification Section 22 10 11. Please confirm that the specification should be 40 27 00.10 and that the joint type should be solvent welded. | AE | Reference to section 22 10 11 is incorrect. Buried and encased W1 piping >=4" shall be C900 PVC (spec section 33 05 09.01). Buried and encased W1 piping <4" shall be solvent welded sch. 80 PVC (spec section 40 27 00.10). |
| 13 | Pipe Schedule calls out Buried and Encased SA Pipe to be Welded SST and to follow spec section 40 27 00.08. Spec section 40 27 00.08 describes pipe 1.5" and smaller to be threaded or flanged. Please confirm that either welded or threaded joints are acceptable for piping 1.5" and smaller. | AE | Confirmed, either welded or threaded joints are acceptable for the sample piping in question. |
| 14 | Refer to detail 4027-804. Please provide the thickness of the top bent plate (SST) for the Manual Screen that spans the 1'-6" channel of the Process Building. | AE | In lieu of standard detail 4027-804, the manual bar screen requirements will be specified under section 44 42 30 in the conformed set of documents. Furnish and install the manual bar screen in the influent channel where indicated on the Drawings. All materials of construction shall be type 304 stainless steel, including anchorage hardware. Bars shall have minimum 1" spacing between each, installed at a 60° angle relative to the bottom of the channel. Provide a 1'-6" square perforated plate at the top of the inclined bars to facilitate dewatering and drainage of raked solids. The top of bar screen and dewatering plate, must be securely anchored to the channel walls such that there is no interference with the specified grating covering the channel. |
| 15 | Refer to details 4027-804 and 0553-001. Manual Screen 20-BSCN-120 (sheet 20D133) spans a trench/channel that is indicated to have embedded angle grating support on both sides (Keynote 4 on Sheet 20S130). The embedded angle requires 2" of horizontal bearing (Note 12 Detail 0553-001). Detail 4027-804 shows anchors for Manual Bar Screen to be 1-1/4" away from the edge of the trench/channel, this anchor location will be in conflict with the embedded angle. Confirm that top bent plate needs to be lengthened and provide guidance on anchor clearance from embedded angle or provide required length of top bent plate. | AE | In lieu of standard detail 4027-804, the manual bar screen requirements will be specified under section 44 42 30 in the conformed set of documents. Furnish and install the manual bar screen in the influent channel where indicated on the Drawings. All materials of construction shall be type 304 stainless steel, including anchorage hardware. Bars shall have minimum 1" spacing between each, installed at a 60° angle relative to the bottom of the channel. Provide a 1'-6" square perforated plate at the top of the inclined bars to facilitate dewatering and drainage of raked solids. The top of bar screen and dewatering plate, must be securely anchored to the channel walls such that there is no interference with the specified grating covering the channel. |
| 16 | Refer to detail 0531-016. Provide dimension (width) for top (horizontal) 3/8" plate. | AE | 3" |
| 17 | Refer to detail 0531-016. Provide dimension (height) for vertical 3/8" plate on each side of the internal pre-cast wall. | AE | 8" MIN. Distance to the bolt hole will control. |
| 18 | Refer to detail 0531-016. Provide horizontal spacing for 3/4" DIA HDG through-bolts. | AE | 2'-0" OC |
| 19 | Refer to Section D - Sheet 50S302. Confirm that detail 0531-017 does not apply to notch in top of internal pre-cast wall panel for W8 ridge beam blocking. | AE | Closure plate will be required to prevent water/snow melt from infiltrating into room. This will be similar to detail 0531-017. |
| 20 | Refer to sheets 70S130 and 70S301. Please confirm that 0551-043 is the appropriate Standard Detail to apply for the Stair Landing Support with TOG EL 8614.50 at the Effluent Storage Tank. | AE | 0551-043 is the correct geometric configuration of the support. Material shall be aluminum instead of steel. |
| 21 | In order to ensure temp chlorine dosing system, Spray Field piping, & Force Main piping meet specs and maintains facility operation, please provide as-builts for the existing Pump House, chlorine system, & Utilities around the sewage ponds. | DSC | |
| 22 | Drawings 70Y131 - 70Y133 call out the existing SS Force Main as 6", however the provided as builts call the Force Main out as 4". Please confirm if the existing Force Main is 4" or 6". | AE | Record drawings show the existing SS Force Main across Tuolumne Meadows as 6" cast iron pipe. |
| 23 | Drawing 08N111 is missing information from the Bill of Materials for 50-LCP-01. Please provide an updated drawing with all Bill of Material information shown. | AE | Updated drawing has be provided. |
| 24 | Refer to sheet 20S140. The Drawing appears to indicate a ridge beam, with W8x31 outriggers 8” adjacent on both sides, between the outermost trusses and walls 1 and 5 at the East and West ends of the Process Building. None of the other buildings depict a ridge beam in that span. Please clarify whether these ridge beams between the outermost trusses and the walls are uniquely required for the Process Building Roof Framing. | AE | This ridge beam is not required. |
| 25 | Refer to Sheet 25S130. The aluminum stairs on the Upper Plan are drawn depicting 18 treads (19 risers), however the dimension/call-out states "14 TREADS @ 11" = 16' 10" - 15 EQL RISERS". 14 treads at 11" each yields a dimension of 12'-10", while 18 treads at 11" each would generate an overall dimension of 16'-6". Please clarify the number of treads, the span per tread, and overall horizontal dimension for these aluminum stairs. | AE | 18 treads, 19 risers, see drawing 25S130 for clarity. |
| 26 | Refer to sheet 01G011. The table in Concrete Reinforcing note #13 has 2 areas that are unreadable. Please provide updated readable table. | AE | A/E version of the drawing do not show any items missing or cut off. |
| 27 | Drawing 25S130 calls out the top of footing at elevation 8576.83. The section views on sheets 25S301 and 25S302 call out the top of footing at elevation 8574.83. Which elevation is correct? | AE | 8574.83 is the correct elevation. |
| 28 | Pdf page 79/84 regarding Project Experience states Offeror is to “Specifically describe experience with Activated Sludge Process (ASP) facilities, in municipal wastewater applications, with a design capacity of 10,000 to 60,000 gallons per day.” Will constructed projects with design capacity greater than 60,000 gallons per day be considered relevant? | DSC | Yes |
| 29 | Pdf page 79/84 regarding Project Experience states Offeror is to “Specifically describe experience with Activated Sludge Process (ASP) facilities, in municipal wastewater applications, with a design capacity of 10,000 to 60,000 gallons per day.” Does the 10,000 to 60,000 range refer to the WWTP capacity, or the ASP Facility capacity? | DSC | ASP Facility |
| 30 | Pdf Page 80/84 regarding past performance, states to “Complete Sections I and II only of the attached Past Performance Questionnaire and forward to your client reference. The reference shall be someone who was substantially involved with the project and can provide a complete, objective assessment of your performance. Direct them to complete and submit the survey to the address and point of contact in paragraph B above by the due date and time for proposal receipt.” If the Offeror has a previously completed PPQ on a form different than that provided, NAVFAC/USACE PAST PERFORMANCE QUESTIONNAIRE to be specific, must the Offeror request a new PPQ to be completed by its customer and submitted on the NPS form, or will the NAVFAC/USACE form be acceptable? | CO | I will accept the different form as long as it contains the same information |
| 31 | Pdf Page 80/84 regarding past performance, states to “Complete Sections I and II only of the attached Past Performance Questionnaire and forward to your client reference. The reference shall be someone who was substantially involved with the project and can provide a complete, objective assessment of your performance. Direct them to complete and submit the survey to the address and point of contact in paragraph B above by the due date and time for proposal receipt.” If the Offeror has previously completed PPQs, must the Offeror request a new PPQ to be completed by its customer and submitted to the address and point of contact in paragraph B, or may the Offeror include these PPQs with its proposal? | CO | As long as these previously completed PPQs cover the same information that is asked in the PPQ provided in the solicitation, that is acceptable. |
| 32 | Pdf Page 79/84, factor 2 directs the offeror to submit the provided “Project Experience” form with the requested information. May the Offeror expand this form, or must it be limited to the formatting and three (3) pages provided by NPS? | CO | The solictation is asking for a total of 3 relevant projects, n ot limiting the proposal factor to 3 pages. You may go beyond 3 pages in your proposal to fully capture these 3 relevant projects. |
| 33 | Pdf Page 80/84, Factor 4 directs the offeror to submit a schedule narrative and a GANTT Chart. Please confirm there is no page limitation associated with this factor. | CO | Confirmed, there is no page limitation to factor 4. |
| 34 | Pdf Page 80/84, Factor 4 states that the Offeror is to “assume access to the site will open on June 15th each year and end on October 15th each year”. Block 11 of the SF 1442 indicates all work to be complete within 2190 calendar days, which calculates to six (6) years. Please confirm it is the intent of this contract that all work be completed within six (6) four (4) month long construction seasons, for a total construction time of 24 months. | This is correct, weather dependent of course. Some years may have earlier access and later access some years shorter but on average those are the avaible access times | |
| 35 | Pdf Page 79/84, Factor 2 directs the Offeror to provide experience at “Construction at remote sites with difficult access, in extreme environmental conditions under limited construction seasons similar to the scope, magnitude, and complexity of this solicitation.” If the offeror does not have experience at remote sites with limited construction seasons, but meets all other experience criteria, will the Offeror’s proposal be evaluated? | CO | The proposal may be evaluated but may increase the RISK in that specific factor. |
| 36 | Pdf Page 80/84 Factor 5 requires the Offeror to submit resumes for key personnel, including Project Executive, Project Manager, Superintendent, On-site Quality Control Specialist, and On-site Safety Specialist. Specification 01 40 00, paragraph 1.5.B.2 details that the QC Supervisor is to ban an individual with a minimum of 5 years combined experience as Project Superintendent, QC Supervisor, Project Manager, Project Engineer or Construction Manager on similar size and type or construction Contracts, AND have at least 2 years experience as QC Supervisor. No resume / experience requirement for a On-Site Quality Control Specialist. Please confirm that the On-site Quality Control Specialist shall meet the same resume / experience requirements of the QC Supervisor. | DSC/CO | The on-site QC Specialist and the QC Supervisor are the same position. The specifications may also refer to this position as the QC Manager. |
| 37 | Pdf Page 18 / 84, Special Requirement 3: Key Personnel indicates the Offeror is to provide names for and assign to this project a Project Executive, Project Manager, Job Site Superintendent, Job Site Quality Control Manager, Job Site Safety Manager. Are these names to be furnished with our proposal, and if so within which volume? | CO | These resumes and key personnel shall be included in your Volume 1, Technical Proposal. |
| 38 | Pdf Page 18 / 84, Special Requirement 3: Key Personnel indicates the Offeror is to provide names for and assign to this project a Project Executive, Project Manager, Job Site Superintendent, Job Site Quality Control Manager, Job Site Safety Manager. These position titles differ from those listed under Factor 5 requiring resume submission with the Offerors Proposal. Please clarify if these are the same personnel, or if there are two sets of personnel to be identified. | CO | These are the same personnel. |
| 39 | Pdf Page 80/84 Factor 5 requires the Offeror to submit resumes for key personnel, including Project Executive, Project Manager, Superintendent, On-site Quality Control Specialist, and On-site Safety Specialist. Specification 01 35 23, paragraph 1.4.C details Qualifications of the Site Safety Supervisor. No resume / experience requirement for a On-Site Safety Specialist. Please confirm that the On-site Safety Specialist shall meet the same resume / experience requirements of the Site Safety Supervisor. | DSC/CO | The on-site QC Specialist and the QC Supervisor are the same position. The specifications may also refer to this position as the QC Manager. |
| 40 | Pdf Page 79/84, Factor 2 - Please confirm that for Offerors belonging to large firms with multiple departments, divisions or Sister Companies, the required Project Experience may be provided by these other departments, divisions and/or Sister companies as long as Offer clearly establishes how the other departments, divisions and/or Sister companies will have meaningful involvement in this project. | CO | Correct as long its clear in the proposal |
| 41 | For outrigger and blocking steel to truss connection Sheet 25S140 references Detail 0521-023 and Sheet 40S140 references Detail 0531-021. The roof framing plans for the other buildings do not reference either detail. Please clarify which detail callout is correct for all the buildings, and confirm that the detail is applicable not only to connections on the roof's slope, but also for the W8 ridge beam to top of truss connections as well. | AE | 0521-023 is the truss/joist bridging detail to attach to the precast panels. The final configuration is determined by the truss supplier. |
Detail 0531-021 is the correct outrigger to truss connection. The intent is to match joist/beam support weld. This detail should be used for all buildings.
Detail is valid for ridge beam to truss connection.
| 42 | Drawing 04C136 identifies the excavation zone affecting John Muir Trail and recommended safety buffer. Structure excavation for the proposed retaining wall may extend beyond these limits in order to maintain a safe slope. Is it allowable to extend beyond the limits, or is shoring required in this location? | PARK | Structure excavation must remain in the Excavation Zone. It is not allowable to extend excavation into the Recommend Safety Buffer Area. The use of shoring is a contractor means/methods. |
| 43 | Refer to Sheet 20S130. Note in middle of the page (North of the building between GL 3 and GL 4) reads "GS-3 ANGLE SUPPORTS PER DETAIL 0553-001 ON EACH FACE OF BAFFLE WALL". The leader from the note is pointing to the edge of the center pipe trench not a baffle wall location. Please clarify which grating support type is to be used for grating on the 3 pipe trenches. | AE | GS-1 (embed) is used at the trench. |
| 44 | On Sheet 20S302 Grating over Secondary Clarifier Basin is called out to be AL GRATING TYPE 'B' per detail 0553-001. On sheet 20S130 the dimension for the opening for the Secondary Clarifier basins is shown to be 5' 4" (in direction of the grating span). The table for Medium Duty Grating Type 'B' (Detail 0553-001 (Detail 4 of 4)) does not allow Aluminum Grating for spans greater than 5'. Keynote 4 (TYP) on Sheet 20S130 states "2-1/2" AL GRATING, TYPE 'B', SEE DETAIL 0553-001. INSTALL GS-1 SUPPORT AT PERIMETER OF CONCRETE WALL, SPAN DIRECTION AS SHOWN." Please confirm that grating spanning 5'-4" over Secondary Clarifier Basin is to be 2-1/2" AL Grating and that additional supports (perpendicular to span) are not needed. | AE | Revise all aluminum grating to SST 316 grating. |
| 45 | Keynote 4 (TYP) on Sheet 20S130 calls for grating to be 2-1/2" Aluminum Grating Type "B". Callout on Sheet 20S130 calls for GS-3 Angle Supports for grating on each face of the baffle walls per Detail 0553-001. Note 1 on Detail 0553-001 (Detail 2 of 4) states "USE GS-3 ONLY FOR LIGHT DUTY GRATING, TYPE 'A'. Please clarify if GS-3 angle supports are to be used to support Type 'B' grating at baffle walls. If GS-3 supports are to be utilized for Type 'B' grating, confirm angle size, anchor size, anchor spacing, and min anchor embedment as shown in Detail 0553-001. | AE | The intent of the GS-3 support is to bridge over locations with weirs/holes/openings. A smaller angle may be used at these locations and a GS-1 (embed) support may be used instead. See question 44 response. |
| 46 | There is no detail referenced for the ladder inside the 4' diameter manhole shown on Sheets 70D131 and 70D301. The only ladder detail provided in the standard detail is Detail 0551-101 LADDER - ALUMINUM - FLAT BAR UNDER COVER - TYPE 'A'. Specification Section 05 50 00 Metal Fabrications Section 2.15 B. Flat Bar Ladder calls for material to be hot-dip galvanize (after fabrication). Please clarify detail, material type, and ladder type. Clarify if ladder safety post is required for this ladder. | AE | Provide galvanized steel steps inside manhole in accordance with spec section 33 05 13, Manholes. Steps shall be cast into manhole sections by manhole manufacturer. Safety post is not required for this location. |
| 47 | Plans and Spec sections 07 41 13 and 07 62 00 do not show gutters and downspouts for the buildings. Please confirm gutters and downspouts are not required. | AE | Gutters and downspouts are not required at any of the facilities. |
| 48 | Specification 32 00 00 Section 1.03.B states all tree trimming, clearing and felling operations must be performed outside the dates of April1 through September 15. The new plant will require several trees to be removed. If Tioga Road is expected to close around October 31, there will only be 6 weeks of available time to work during the first season between when clearing can begin and the road closing. Can the tree operation dates be adjusted to allow full access to the work during the first season? | PARK | Tree trimming, clearing, and felling operations between April 1 and September 15 is allowable granted a Migratory Bird Survey is performed by qualified YOSE staff. After a Migratory Bird Survey is completed, the Contractor has one calendar week to perform tree trimming and felling activities. After that week has passed, a subsequent Migratory Bird Survey will need to be performed. Once the trees are felled, the Migratory Bird resource (nesting) has passed and ground activities such as stump removal and moving downed timber can be done without concern for the nesting. |
| 49 | Sheet 20S140 calls out for 6 each W8X31 outriggers equally spaced on each side of ridge and shows 6 each outriggers on each side of ridge. Sheet 25S140 calls out for 6 each W8X31 outriggers equally spaced on each side of ridge but shows 7 each outriggers on each side of ridge. Sheet 40S140 calls out for 3 each W8X31 outriggers equally spaced on each side of ridge but shows 4 each outriggers on each side of ridge. Sheet 50S140 calls out for 6 each W8X31 outriggers equally spaced on each side of ridge but shows 7 each outriggers on each side of ridge. Please clarify the correct number of outriggers to be equally spaced on each side of ridge for each building. | AE | An exact spacing cannot be provided as the precaster may elect to change joint spacing for the panels. The maximum spacing for the outriggers shall not exceed 4'-0". |
| 50 | Pdf Page 80/84, Factor 4 - Please confirm that the required GANTT Chart may be presented on 11"x17" pages | DSC | 11x17 PDFs are acceptable. However, Gantt Charts must be clear and legible, regardless of the page sizing. |
| 51 | Plan Sheet 34 (04C135) shows a “LIMIT OF GRADING” line to the south and east sides of the site where the new retaining wall shown on Plan Sheet 43 (04S201) is to be constructed. The Heel Width for the ‘B’ type retaining wall is shown in Det A/43 as 14’-0”, ending with a keyway under which “SUBGRADE PREPARATION” is shown to extend beyond the heel by 1’ minimum and then slope upwards at a 1:1 slope. This excavation will significantly exceed the limit of grading line. Please confirm it will be acceptable to follow Det A/43 and slope the excavation up and away from the heel of the retaining wall footing at a 1:1 slope to daylight at a ‘catch point’ with existing grades which will differ from the current limit of grading line. | AE | Yes, this is acceptable. See 04C136 for Buffer Areas for wall excavation |
| 52 | Specification Section 41 22 03.07 paragraph 2.02 A.1. identifies a requirement for two (2) Portable Davits with Davit Crane Bases identified in paragraph 3.a.4) to be mounted at the Influent Pump Station (Facility 10), and at the Effluent Storage Tank (Facility 70) should Bid OPTION A be awarded. Paragraph 2.02 B. is for Personnel Davits which appears to be a requirement in addition to the Portable Davits under 2.02 A. Paragraph 2.02 B.4.b. identifies Fixed Davit Bases to be installed in the following quantities and to “see the Drawings for specific locations.” Facility 10 Influent Pump Station shows to install 1, however there is only 1 davit crane base location identified on Plan Sheet 89 (10S130) which we understand is for the Portable Davit identified in 2.02A, and not a second davit crane base shown for a Personnel Davit. Facility 20 Process Building 1 shows to install 11 davit crane bases, but Plan Sheet 105 identified a quantity of 9. Facility 25 Process Building 2 shows to install 2 davit crane bases, but no locations have been found in the Facility 25 drawings. Facility 70 Effluent Storage Tank shows to install 1, however there is only 1 davit crane base location identified on Plan Sheets 252 (70S130) & 256 (70D131) which we understand is for the Portable Davit identified in 2.02A, and not a second davit crane base shown for a Personnel Davit. Please clarify quantities of Personnel Davit Cranes required, and quantities and locations of Davit Crane Bases to be installed. | AE | There are requirements for davit cranes under both 2.02.A and 2.02.B. At Facility 10, two davit cranes are required (one of which for personnel mounted to vertical face of concrete underneath hatch) in addition to the one shown on structrual and process plans. At Facility 20, sheet 10S130 is correct showing 9 locations for personnel davit bases. At Facility 25, two personnel davit crane bases are required and will be installed next to the ladder tie off locations. At Facility 70, 6 davit cranes are required (five of which for personnel mounted to vertical face of concrete underneath hatches) in addition to the one shown on structrual and process plans at hatch above spray field pumps. Locations of cranes will be added to conformed construction drawings issued prior to NTP. |
| 53 | “Keynote 11 on Plan Sheet 33 shows a 6’ Ornamental Aluminum Fence around the perimeter of the WWTP site, including where the WWTP site retaining wall is located. Detail A on Plan Sheet 43 shows the retaining wall extending 6’ minimum above the outer finish grade, which will provide access control and fall protection from the outside of the plant, and does not show a 6’ fence mounted on top of the wall. We believe the intent is to include the aluminum fencing on the west and north sides of the WWTP and not to include the aluminum fencing on the south and east sides of the WWTP site where the retaining wall already provides appropriate protections. Please clarify and confirm intent.” | AE | Note 11 is incorrect. The fence is only on the west and north face. The concrete wall is on the south and east face and extends 6' above grade. |
| 54 | Spec Section 01 19 14 - 3.10 A. EQUIPMENT AND SYSTEM SCHEDULE does not list any equipment or systems in the table. Please confirm. | AE | Revised Section 01 91 14, Total Building Commissioning, with updated table in article 3.10.A has been provided. |
| 55 | Drawings 20P130, 25P130, and 40P130 reference Floor Cleanout Detail 2213-140, however, Detail 2213-140 is not included in the Standard Detail package. Please provide the missing detail for this callout. | AE | Standard Detail 2213-140 will be provided |
| 56 | Drawing 50P130 references Detail 2205-180 for the 3" vent line, however, Detail 2205-180 is not included in the Standard Detail package. Please provide the detail for this callout. | AE | Standard Detail 2205-180 will be provided |
| 57 | 40. Spec Section 015728 - 3.09B calls to provide tap & piping in place to drain sewage from existing pipeline before it is cut and to capture contents that may drain out when pipe is cut. Please clarify if the existing Force Main & Spray Field piping fluids are considered sewage and provide a location(s) where the sewage can be discharged within the facility. | AE | The existing force main is considered sewage and must be discharged to the existing wastewater treament plant influent as required in 01 57 28, article 3.10.C. Alternately, sewage may be discharged into any sanitary sewer manhole within the sewer collection system. Any pipe downstream of the chlorine disinfection process that discharges to the spray field is not considered sewage and may be disposed of in the existing lagoon. |
| 58 | 41. Please provide the current sewage flow rates and percent of solids in order to provide the correct bypass pumping system to meet the sewage flow characteristics. | AE | Plant influent flow rates are highly variable. Flow rates for several design conditions are listed on Drawing 01G023. Typical solids concentration for raw wastewater is 0.1% as listed in Section 44 42 56.04, Supplement |
| 59 | 42. Drawing 20D133 specifies an 8" V405 valve mounted on the wall pipe in the Bioreactor Channels. Drawing 20D305, Section L calls out an 8" V150 valve for the same location. Please confirm the correct valve type intended for this location. | AE | 8" V405 is correct. |
| 60 | 43. The Piping Schedule indicates that Backwash Supply (BWS) piping is not to be insulated or heat traced. However, Specification 40 42 13 – Process Pipe Insulation, under the service and insulation thickness table, lists BWS as requiring insulation and heat tracing. Please confirm whether the Backwash Supply (BWS) piping is required to be insulated and heat traced. | AE | See Note 11 on Piping Schedule, as well as spec section 40 42 13, Process Piping Insulation, Supplement 1, Service and Insulation Thickness table. Note 1 on this supplement also states that the pipe services listed in the table only apply to Facilty 20 (Process Bldg. #1). |
| 61 | 44. General Note 6 on 70S130 indicates the installation of fall protection anchors, but Note 6 isn't called out on the drawing. Please clarify the location, or locations, requiring the set of (2) fall protection anchors in the Effluent Storage Tank Roof. | AE | Provide fall protection anchors each hatch. The anchor is to be installed in the middle of the stuctural slab (9" from top of slab). |
| 62 | 45. Drawing 70D131 specifies 6" V132, which is spec'd to be a Resilient Seated Gate Valve. However, the manufacturer is not indicated in Specification 40 27 02 Process Valves and Operators. Please provide the listed manufacturer for the specified valve to ensure compliance with project requirements. | AE | Any valve manufacturer that meets the requirements listed in the specifications are acceptable. |
| 63 | 1.04 A.21 We were under the impression that a checkpoint bioassay would not be required. Please confirm if one is needed and who is responsible for the costs associated with the bioassay | AE | Section 44 44 73, 1.04.A.21: Checkpoint bioassy will not be required. |
| 64 | 1.04 B.13&14 We were under the impression that a checkpoint bioassay would not be required. Please confirm if one is needed and who is responsible for the costs associated with the bioassay. If not required please remove this reference | AE | Checkpoint bioassy will not be required. As noted in 44 44 73, 1.04 A.21 these paragraphs apply only "if required," and it will not be required. |
| 65 | 2.04.G.1&2 Please confirm that the power will be provided by the contractor per section 1.01.D.1.k and that transformers are not to be provided by the UV manufacturer. | AE | Section 44 44 73, 2.04.G. Correct electrical service provided to all equipment is ultimately the responsibiltiy of the Constructor. Coordination between the Contructor and all subcontractors and equipment suppliers is the responsibility of the Constructor. |
| 66 | 2.05.A.4 Please note that the PDCs do not have PLCs to control the system. The system is controlled using a PCB board (the P40 control board developed by Trojan) | AE | Section 44 44 73, 2.05.A.4: Noted and accepted. |
| 67 | 2.05.B Same as 2.05.A.4. PDCs do not use PLCs | AE | Section 44 44 73, 2.05.A.4: Noted. Ultraviolet system supplier is responsible for providing program codes to allow operation of the UV system as intended. |
| 68 | 3.04.A This section was not provided for review. Please provide or remove the reference to this section | AE | Specification Section 09 90 00 is availabe from NPS or the prospective solicitors for review. |
| 69 | 3.05 D.2 This contradicts 1.01 A.21 and 1.04 B 13&14 earlier in thet spec. Please confirm a spot check is not required and if so please remove the requirements in 1.01 A.21 and 1.04 B 13&14 | AE | Section 44 44 73.3.05.D.2: Bioassy spot check will not be required. |
| 70 | 3.06.B.1.e This contradicts the 8 days Performance Test called in part B.1.f. Is it to be 8 or 15 days for performance testing. d combine with SU and operator training together for toal of 3 weeks | AE | In Section 44 44 73, 3.06 B.1.e, the correct duration is 15 total person-days as stated in 3.06 B.1.f. |
| 71 | 3.06.B.1.f 8 days or 15 days for PT? B.1.f contractics B.1.e. Please clarify | AE | 44 44 73, 3.06 B.1.f:15 person-days is correct. |
| 72 | Section M, paragraph 2.a Factor 2 describes project experience to evaluate the offerors capability to successfully complete relevant projects of similar scope and magnitude to this solicitation. Section L, Instructions, paragraph E.3, Factor 2 does not define a minimum or maximum project value to establish project magnitude. Block 10 of the SF 1442 identifies the magnitude of construction of this project as over $10,000,000. Please confirm that for all projects submitted under Factor 2 or 3, to be considered relevant, they shall be valued over $10,000,000. | DSC | This is correct. |
| 73 | 70S drawings for the Effluent Storage Tank do not indicate any rigid insulation over fluid-applied waterproofing at below grade walls. Please confirm if both are required. | AE | No insulation is required. |
| 74 | Please confirm if specification 06 20 00 Finish Carpentry is to be applied for the cement fiber board cladding shown on the retaining wall in Drawing 04S201/Section A. If so, indicate type of siding to be used in 2.01.B. | AE | Provide fiber-cement panel siding (06 20 00-2.01.B.1) with fiber-cement board battens (06 20 00-2.01.B.3). Provide fiber-cement trim (06 20 00-2.01.B.4) where required at wall terminations and transitions. |
| 75 | For exterior concrete pads (i.e. Trailer & Trash pads) is contractor to classify these concrete elements as "Building Structures" (Mix Design CMD-1), or "Curbs and Sidewalks" (Mix Design CMD-4)? | AE | CMD-4 is acceptable for this application. |
| 76 | Sheet 04C135 references Standard Detail 0330-065, however this detail is not provided. Please confirm it's acceptable to use 0330-056. | AE | Standard Detail 0330-056 is the correct detail to use |
| 77 | Sheet 10SD140 references Standard Detail 0559-026, which specifies interior bollard cast into 10" min. thickness slab. However, no slab is shown in the drawings. Please reference alternate detail or provide pad dimensions. | AE | Detail 3305-954 is the correct detail for this application. |
| 78 | Reference sheets 04C138 and 04C141. Point 167 is identified as FG Bollard on Sheet 04C141. On sheet 04C138 the leader for Point 167 appears to be cut off and is not pointing to a location that depicts a bollard. Please clarify where the bollard(s) for point 167 are located. | AE | There is no bollard at Point 167, The control is for the angle point in the road. Elevation is FG. |
| 79 | Per Standard Detail 0553-001 General Note 5 and Spec Section 05 53 00 2.06.D.1, supports for grating are to be same material as grating. Per Keynote 4 on Sheet 20S130 grating is 2-1/2" AL Grating, Type 'B'. Per callout on Sheet 20S130 grating is to be supported at each face of baffle walls with GS-3 angle supports (ledger). Per the standard detail and specifications the GS-3 supports for grating would be Aluminum. Note 7 on Sheet 20S130 identifies 3 locations where grating edge supports are to be 316 SST. Please confirm that supports at 3 each locations identified by Note 7 are to be 316 SST, and that locations on each face of the baffle walls (and inside pipe trenches) are to be Aluminum. | AE | See question 44 response. |
| 80 | With the anticipated Notice to Proceed (NTP) date being in June 15,2026, and the required final completion being within 2,190 Calendar Days of NTP, the Final Construction Milestone is estimated to be in June 15,2032. Per spec section 01 11 00 1.10 Special Construction Requirements, the average work window based on access to the site is from early June through late October. Coupling the anticipated final construction completion date of June 2032 and the average work window, the time from November 2031 through June 2032 is likely rendered non workable. Please confirm it is the NPS’s intent to have the Final Completion Milestone be in June 2032. | DSC | Confirmed |
| 81 | 2.02A Table 1 - The design criteria table specifies a backwash rate of 5-15 gpm/sq ft. Please confirm that the specified backwash method is air-followed-by-water backwash, and not combined air and water backwash. The backwash rate for air-followed-by-water is 15 gpm/sqft not, 5 gpm/sqft. | AE | Section 43 31 14, 2.02.A: If air-followed-by-water backwash is the supplier's backwash approach, use 15 gpm/sqft. If the supplier's backwash approach uses combined air and water backwash, use 5 gpm/sqft. |
| 82 | 2.02A Table 1 - The influent turbidity data is missing from the water quality table. Without the influent turbidity level, we may not be able to provide a performance guarantee for the effluent turbidity. | AE | Section 43 31 14, 2.02.A: Average Filter Effluent must achieve a total suspended solids concentration of either 5 mg/L or a 50-percent reduction of the influent total suspended solids concentration, whichever value is higher. Subparagraph 2.01.B.1.b states the range and average total suspended solids concentration at the filter influent. |
| 83 | 2.03 A.4.b – The effluent/backwash supply connection size needs to be 4 inches, the same as the influent flange size due to backwash flow rate. | AE | Section 43 31 14, 2.03.A.4.b: A 4-inch connection is acceptable and may be coordinated during the submittal process. |
| 84 | 2.03 A.7. c&h – Bullet point “c” indicates that a header-lateral underdrain is required. Bullet point “h” requires the underdrain to be installed prior to shipment; if that is the case, a flat-plate underdrain would be required. A header-lateral underdrain must be field-installed to avoid damage during shipping. Please remove either bullet point “c” or “h,” as they contradict each other. | AE | Section 43 31 14, 2.03.A.7.h: Filter undrain systems are not be required to be factory installed. |
| 85 | 2.03 A.13.e – The orifice plate locations and quantities are missing from the drawing. Please confirm both the locations and the quantities. | AE | Section 43 31 14, 2.03.A.13.e: If orifice plates are required for control of the filter system, follow the material and the use of gaskets as noted in paragraph 2.03 A.13.e. If orifice plates are not used for the selected filter system, they may be omitted. |
| 86 | Sheet 08N008: Airwash blower control (25-MS-170) – Please confirm if this is by contractor or filter supplier. WesTech assumes this is by contractor per spec section 43 31 14, 2.03 A.12.f. | AE | Per Specification Section 43 31 14, subsection 1.03.A, all equipment specified must be furnished by one supplier. |
| 87 | 44 45 16.01 / 2.01 - Please add language about acceptable manufacturers. Yosemite El Portal’s specification section listed INVENT ICBA Course Bubble System, which is what is going into the El Portal WWTP project currently (submittal being reviewed). Please see attached specification from that project. | AE | Any manufacturer that meets the requirements listed in the specifications are acceptable. |
| 88 | 44 45 16.01 / 2.05 A - Remove “Rubber duck-bill”. For consistency between plants, please reference section 2.06 in the attached specification from El Portal bid. | AE | The requirements listed in subsections 2.05.A, B, and C apply to the aerated WAS Tank systems. For the Bioreactor Re-aeration systems the diffuser shall be: A coarse bubble, nonclogging type, having no moving parts and providing full wide band aeration. Air shall be released uniformly along diffuser. Air exit ports shall be at or below the diffuser connector invert. A deflector shall be provided below each diffuser for the full length and width. The deflector shall be designed to direct the liquid being aerated along the diffuser so that air exits through the port and is sheared into small bubbles and distributed into the liquid. The deflector shall be integral with the diffuser and supported by the diffuser end caps. Open bottom diffusers allowing liquid and debris to enter the bottom of the diffuser will not be permitted. |
| 89 | Addenda #2 rescinded setting up a concrete batch plant as stated in Specification 01 11 00/1.5.B, p.3. Has an alternate location for an on-site batch plant been designated? | DSC | No. |
| 90 | Please confirm if the cement fiber board cladding shown on the retaining wall in Drawing 04S201/Section A is to be field painted. If so, provide Paint System Number and Color. | AE | Fiber cement board cladding on the retaining wall to match layout and color of siding with board battens on building wall assemblies. Refer to Architectural Schedules (Exterior Finish Schedule and Color List) on the Drawings. Field paint cladding with paint system number 118 in color W-3 (Federal Standard 10080 Seal Brown). |
| 91 | Refer to Sheet 40S130. The trench near the center of the building identifies the grating that goes over the trench as Type 'C' Heavy Duty HDG Grating. The other trench in the containment area of the building identifies the grating for the trench as Type 'A' Grating but does not state the material type for the grating. Please clarify the grating material type for the containment area trench. | AE | The grating material for the containment area is aluminum. |
| 92 | Please note that for Sch 80 PVC (listed for W1 as well as an unknown system appearing just above "DRAIN") are not available in PRJ and SDR35 PVC (as listed for system "SD") is not available in sizes smaller than 4". | AE | Solvent welded sch. 80 is acceptable. |
| 93 | Pipe Schedule on DWGs 01G025 & 26 is in such a poor condition that many systems are not visible and therefore we cannot determine their material and other requirements. | CO | in new amendment on sam |
| 94 | The controls described in spec section 44 42 30 are not applicable to the SLB equipment. | AE | A revised Section 44 42 30 will be provided with updated control requirements. |
| 95 | Section 46 76 27-2.01.F.2.d. outlines an E-Stop switch for the screw press. Is this to be a locally mounted E-Stop push button? If so, please confirm desired NEMA rating. | AE | The E-stop must be mounted on the control panel only, which must be NEMA 4X rated per 46 76 27, 2.01.F.1.d. |
| 96 | Section 40 90 00-1.08.C. outlines spare parts. Please confirm if these spare parts are to be included in the screw press manufacturer’s scope of supply. | AE | Specification Section 46 76 27, 2.01.F.1, states all instruments and controls must comply with the requirements of Section 40 99 90. Section 40 99 90 requires all control panels to meet the requirements of Section 40 90 00, which includes spare parts. |
| 97 | Section 40 92 01-2.08C outlines witnessed factory acceptance testing. Is witnessed testing required for the screw press provider for section 46 76 27? | AE | Specification Section 46 76 27, 2.01.F.1, states all instruments and controls must comply with the requirements of Section 40 99 90. Section 40 99 90 requires all control panels to meet the requirements of Section 40 92 01. Per Section 40 92 01, 2.08.C.2, the Contracting Officer reserves the right to participate in Factory Acceptace Tests. |
| 98 | Section 40 99 90-1.06.A outlines spare parts. Please confirm if these spare parts are to be included in the screw press manufacturer’s scope of supply. | AE | Specification Section 46 76 27, 2.01.F.1, states all instruments and controls must comply with the requirements of Section 40 99 90. Section 40 99 90 requires all control panels to meet the requirements of Section 40 99 90, which includes spare parts. |
| 99 | Section 40 99 90-2.06.A.5 outlines a licensed copy of A-B Studio 5000. Please confirm if this software license. | AE | This requirement is for a software license |
| 100 | Section 40 99 90-2.09.A.2 outlines a 12” A-B PanelView Plus 7 display. Is the standard model acceptable, or is the performance model required? | AE | The requirement of Section 40 99 90, 2.09.A.2 must be met. |
| 101 | Section 46 76 27 does not appear to directly reference division 26 for control requirements. It appears there are sections in Div. 26 that include control requirements. Is the supplier of section 46 76 27 required to meet control requirements from Div. 26? | AE | Specification Section 46 76 27, 2.01.F.1, states all instruments and controls must comply with the requirements of Section 40 99 90, which includes electrical requirments. |
| 102 | Drawing 20E131: Disconnect switches 20-DSW-370 and 20-DSW-380, along with their associated control stations, are shown on this drawing but do not appear on one-line drawing 05E700 or in the P&IDs. Please provide clarification and supporting information. | AE | The pumps associated with 20-DSW-370 and 20-DSW-380 are not required. Pump 20-P-360 is to be connected to 20-DSW-360 and 20-CS-360 but located where 20-DSW-370 and 20-CS-370 are currently shown on the Drawings |
| 103 | Drawing 20E131: The pumps associated with 20-DSW-370 and 20-DSW-380 are not identified anywhere in the drawing set. Please confirm the location and designation of these pumps. | AE | The pumps associated with 20-DSW-370 and 20-DSW-380 are not required. Pump 20-P-360 is to be connected to 20-DSW-360 and 20-CS-360 but located where 20-DSW-370 and 20-CS-370 are currently shown on the Drawings |
| 104 | Drawing 20E801: The cable and conduit schedule lists ¾" conduits with 3#12 and 1#12G between several disconnect switches and pumps, while the notes describe these as plug-and-cord connections. Please confirm whether the intent is for the electrical contractor to install ¾" conduit as a raceway for power cords feeding the pumps from the 4-pin disconnect receptacles. | AE | Plug and cord connections are for submersible pumps that are intended to be unpluged and removed durring winter. No conduit to be used between DSW and Pump. |
| 105 | Drawing 01G028: Note 3 references Drawing 01G032 for material selection designation by facility and area. Please provide Drawing 01G032. | AE | The information is inclued in the Area Classification Table on Drawing 01G027. |
| 106 | Site Drawing 05E134: DB-05 is shown running from the Operations Building to 20-MCC-01. Cable block diagrams 20E701 through 20E705 show some control conduits from 50-LCP-01 routed through junction boxes and others running directly to control devices. Please confirm whether these junction boxes are intended to be in ground pull boxes not shown on the site drawings, or above-grade boxes mounted within the process building. | AE | J boxes shown on cable block diagrams are to be installed in Facility 20 |
| 107 | Specification Section 40 27 01. 3.02 B. States for "Flexible Expansion Joints shall be provided to compensate for earth settlement at buried piping connections to structure wall pipes." Please confirm that flexible expansion joints will not be required for buried pipe connections to encasement concrete. | AE | Flexible joints used to compensate for settlement shall be installed beyond the termination of concrete encasement, for example where pipe encasement is not continuous between facilities. Flexible joints are not required on buried pipes that are fully encased between facilities. |
| 108 | Specification 40 27 01, section 2.04-Flexible Expansion Joint, describes a flexible expansion joint suitable for installation on Ductile Iron piping. If required for other pipe materials, please provide the Make and Model for flexible expansion joints for piping that is not Ductile Iron. | AE | PVC and HDPE: EBAA Iron, FB Flex-Tend Expansion Joint (or approved equal) |
SST: Victaulic, Dynamic Movement Joint Style 257 (or approved…
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