Q and A.pdf

CUI#

SOW/RFTP

Reference Question Answer

SOW Phase 1, 1.a.i.2

The specification requires 99% removal of free and dispersed hydrocarbons larger than 20 microns. Please confirm the basis for the 20-micron threshold. The assumption is that this number is pulled from UL 2215. Is this derived from UFC 3-240-01, the facility NPDES permit, or a site-specific discharge requirement? The standard API 421 compliance threshold is 60 microns. The distinction materially affects separator sizing, plate pack configuration, and cost. IT IS CRITICALLY IMPORTANT TO DETERMINE IF EVALUATION

WILL INCLUDE REVIEW OF LONG HAND REMOVAL EFFICIENCY CALCULATIONS, OR IF

“STATED” VALUES WILL BE ACCEPTED.

20 micron requirement is derived from the effective limit of fixed media coalescers. The current site specific requirement driving this project forward is the observed presence of oils directly downstream of this facility. This has caused oil to travel through the wastewater system and caused disruptions at the wastewater treatment plant causing disruptions in the treatment process and the disruption of class A reuse wastewater.

SOW Phase 1, 1.a.i.3

The SOW specifies gravitational and coalescing plate separation. Will the Government accept an OWS design that achieves 20-micron removal through coalescing plate technology alone (without supplemental filtration or media polishing), provided the separation efficiency is validated through engineering calculations demonstrating compliance with Stokes Law for the specified flow rate, fluid properties, and temperature conditions?

The government is open to any contractor proposed solutions that are expected to meet requirements.

SOW Phase 4, 1.c

The SOW references EPA Method 1664 for oil separation testing with the qualifier "IF APPLICABLE." Please clarify: (a) Is Method 1664 (HEM/SGT-HEM) testing required for commissioning acceptance, or is flow rate and visual/sensor-based separation validation sufficient? (b) If required, what pass/fail threshold applies to the effluent (mg/L)?

The government requires verification/validation that the installed oil water separator is functioning correctly. The government will accept other recognized test methods such as published ASTM test methods.

RFTP

Background;

SOW

General

What is the characterization of the influent wastewater? Specifically: (a) What hydrocarbon types are expected (JP-8, hydraulic fluid MIL-PRF-83282, lubricants MIL-PRF- 7808/MIL-PRF-23699, or mixed)? (b) What is the expected concentration range of hydrocarbons (ppm)? (c) What is the expected influent temperature range (annual min/max)? (d) Are emulsified hydrocarbons (from detergents, soaps, or pressure washing) expected in the waste stream? Proper OWS sizing requires viscosity and density corrections based on actual fluid properties and temperature, per Stokes Law.

a) Jet A fuel is what is expected

b) Concentrations are unknown and vary wildly depending on facility users

c) Expected water temp ~60F

d) Government is trying to capture free oil, and mechanical emulsions (dispersed oil)

SOW Phase 1, 1.a.i.1

Is the 300 GPM flow rate a peak design capacity, a sustained average, or a surge condition? For a gravity-fed system, please provide: (a) the elevation of the inlet connection point relative to grade, (b) the available hydraulic head from the facility drain to the proposed OWS location, and (c) whether flow equalization or surge attenuation is required upstream of the separator.

Peak capacity

a) estimated ~3ft must be field verified

b) estimated ~5ft must be field verified

c) Not required

SOW Phase 3, 2.a.i

The SOW requires piping capable of withstanding JP-8, JP-10, hydraulic fluids, grease, oils, soaps, and detergents. Does the facility currently use soaps or detergents in wash operations that discharge to this waste stream? If so, please identify the products.

Surfactants create emulsions that reduce gravity separation efficiency and may require different treatment approaches.

Currently unable to get relevant technical orders on cleaning requirements. Government is only concerned with removal of free oil and mechanical emulsions (dispersed oil)

# CUI

Attachment 4 (Utility Map)

The utility area map shows an electrical transformer and underground primary power lines in proximity to the estimated excavation area. Please provide: (a) the minimum horizontal clearance required from the transformer and underground primary lines during excavation, (b) whether the underground primary lines are direct-buried or in conduit, and

(c) whether a de-energization or isolation protocol will be required during excavation operations.

a) Min transformer clearance 5ft horizontal

b) Transformer high side in conduit based on utilities data.

c) Not required unless transformer must be moved to accommodate

OWS

SOW Phase 2, 2.a

With MHAFB frost depth at 32 inches and the SOW requiring 48 inches of clearance below the frost line, the OWS tank bottom will be approximately 80 inches (6.7 feet) below finished grade. Given the proximity to the Hush House foundation and existing utilities: (a) Is geotechnical boring data available for the excavation area? (b) What is the known water table depth? (c) Are there any known subsurface obstructions (abandoned utilities, previous foundations)?

a) Two closest boreholes from when Hush House was constructed show bedrock at 5.5' and over 10' from ground surface elevation.

Approximately 40' and 60' from proposed excavation area respectively.

b) Water table depth is approximately 400' from ground surface.

c) All known subsurface obstructions are shown on map.

RFTP Factor 5;

Attachment

The utility map shows storm water gravity lines and sewer gravity service in the project area. Please confirm: (a) The exact tie-in point for OWS effluent discharge. (b) Whether the effluent discharges to the sanitary sewer or to a separate industrial waste line. (c) What is the invert elevation of the receiving line at the connection point? This determines whether the OWS can be fully gravity-fed or if an effluent pump is required.

a) Exact tie in point will have to be field verified during the project.

B) Effluent discharges to sanitary sewer.

C) Unknown will have to be field verified/measured.

SOW Phase 1, 1.a.ii

The SOW requires integrated sensors for real-time detection of oil accumulation beyond 15% tank volume threshold. Please clarify: (a) Is the 15% threshold measured as a percentage of total tank volume or as a sump/collection chamber level? (b) What communication protocol is required for the smart alert system (4-20mA, Modbus, BACnet, or other)? (c) Is integration with an existing building management system (BMS) or SCADA required? Or is this in line oil in water monitoring to ensure compliance?

A) Collection chamber level B) Based on discussions no nearby interfaces for communications and alert system will only require a visual component to alert Air Force personnel performing regular checks on oil water separator. Will revise statement of work to match.

C) No longer required, and not needed for compliance purposes. Will revise statement of work to match.

SOW Phase 1, 1.a.ii.4-5;

Phase 3, 3.c.iii

The SOW requires vapor-phase carbon adsorption and explosion-proof venting. Please provide: (a) Expected VOC constituents and concentrations. (b) Whether continuous VOC monitoring is required or periodic sampling is acceptable. (c) Whether the explosion-proof venting must comply with API 2000 or another specific standard. This information is necessary to size the carbon bed and determine replacement frequency.

Vapor-phase carbon adsorption requirement is not needed. Will revise statement of work to match.

C) Upon inspection of applicable documents requirement for explosion proof venting will be removed and adjusted to reference UL 2085 and NFPA 30 for vent sizing/requirements.

SOW Phase 1, 1.a.ii.3

The SOW specifies scheduled solids extraction and a dewatering system to prevent sludge overloading. Please clarify: (a) Is this an automated mechanical system (screw conveyor, vacuum extraction) or a manual process with scheduled maintenance? (b) What is the expected solids loading rate? (c) Where will extracted solids be staged for disposal, given FOD restrictions on the airfield?

a) scheduled maintenance

b) unknown

c) government personnel will remove solids from flightline and dispose of with hazmart if necessary.

RFTP

Technical Criteria;

SOW

Technical Criteria

The RFTP references UFC 3-240-01 and the SOW references UFC 3-240-04A. These are different documents (3-240-01 covers wastewater collection broadly; 3-240-04A covers OWS design specifically). Please confirm which UFC governs the OWS design requirements for this project. UFC 3-240-01 superseded UFC 3-240-04A. Will revise SOW to remove erroneous references.

SOW Phase 4, 2.b

The SOW requires securing state-level discharge permits "if applicable." Has the Government determined whether an Idaho DEQ individual discharge permit or coverage under a general permit is required for this OWS effluent, or is that determination the contractor's responsibility? Not applicable will revise SOW to remove ambiguous language

SOW Phase 4, 3.c

The SOW requires a 1-year no-limit commercial warranty. Please define the scope of "no-limit": (a) Does this include consumables (coalescing plates, filter media, carbon media, gaskets, sensors)? (b) Does this include performance degradation below the 99% / 20-micron threshold if caused by changes in influent characteristics (e.g., introduction of new cleaning chemicals)? (c) Does warranty coverage require use of OEM replacement parts?

a) Not consumable items unless premature failure caused by manufacturing defects, or poor workmanship during installation.

b) No

c) Warranty work would be expected to replace faulty/defective parts with approved parts from the manufacturer.

SOW Phase 3, 2.b; RFTP Background

The RFTP states the system is gravity-fed. The SOW specifies automatic inlet flow restrictors and emergency shutoff valves. For a gravity-fed system with no pumped influent: (a) What triggers the emergency shutoff (high oil level, high flow, spill detection)?

(b) Is the shutoff an electrically actuated valve on the inlet, or a different mechanism? (c) Should the system include a bypass for the OWS to prevent facility flooding if the OWS is taken offline for maintenance?

a) Spill Detection

b) Preferred electrically actuated valve on inlet

c) Manual bypass not needed

SOW Phase 3, 2.b; RFTP Background

The RFTP states the system is gravity-fed. The SOW specifies automatic inlet flow restrictors and emergency shutoff valves. For a gravity-fed system with no pumped influent: (a) What triggers the emergency shutoff (high oil level, high flow, spill detection)?

(b) Is the shutoff an electrically actuated valve on the inlet, or a different mechanism? (c) Should the system include a bypass for the OWS to prevent facility flooding if the OWS is taken offline for maintenance?

a) Spill Detection

b) Preferred electrically actuated valve on inlet

c) Manual bypass not needed

Can you confirm the discharge path for the OWS (sanitary sewer vs. other), and identify who owns and regulates the receiving system (base vs. city utility)?

Sanitary sewer.

Base owned and maintained.

Is there an existing industrial discharge permit or agreement for this facility, and will this project require new or modified approval from the receiving utility or regulator?

No existing discharge permit and will not require new permit.

Is the facility currently covered under any NPDES permit, and if so, will this project require modification or additional coordination with the Environmental Protection Agency or Idaho Department of Environmental Quality? No.

Has any prior coordination been completed with regulatory agencies (EPA, state, or local utility), and are there known discharge limits or requirements (e.g., oil & grease limits, flow restrictions, monitoring)? No, and no known discharge requirements.

Does Mountain Home AFB own all sewer infrastructure and project area, or will this project require off-base coordination and approvals with a city or other entity? Mountain Home AFB owns all sewer infrastructure downstream including wastewater treatment plant.

Are all utility lines shown in Attachment 4 existing, and what is the quality/accuracy level of available utility data (location, size, material)?

Yes and accuracy is spotty. Government expects deviations from shown lines and field verification is needed.

Is there an existing topographic survey available for the site, and are there any known utility conflicts or site constraints in the proposed OWS area? Are the elevations of the existing sewer and other utilities known and can be provided?

Government can provide rough topographic data for site.

Stormwater sewer pipe runs through proposed area, but exact alignment is unknown.

Existing elevations are unknown and require field verification.

Can you confirm the intended tie-in location (e.g., upstream of the sewer pump) and that no modifications to the pump station or downstream system are anticipated? Government expects OWS to be placed upstream of lift station with no downstream modification.

Is continuous operation of the existing sewer system required during tie-in, or are outages/shutdowns allowable?

Scheduled outages are allowable, but require coordination with base mission partners.

Does the project scope include updating the base’s Spill Prevention, Control, and Countermeasure (SPCC) Plan per 40 CFR Part 112? No

Are there any additional base-specific environmental review processes or permitting requirements (including electrical/fire hazard compliance) that must be completed beyond what is listed in the SOW?

Base specific environmental requirements listed in "Attachment 1 - 01 57 19 Temporary Environmental Controls_MHAFB Env Spec 20220614"

29 Will personnel that drive on the exterior of the structure need flight line training?

Personnel driving on the airfield will require contractor airfield training

Is it the Government’s intent that the contractor will construct from the 90% drawings and submit as-builts for final record drawings?

The government intent was to receive manufacturer cut sheet of off the shelf oil water separator, manufacturer installation instructions, specifications for installation, testing plan, and as-built/redline drawings of installed OWS.

What level of design is required, i.e. full plans and specifications, or can specifications be included on a plan sheet in lieu of a full specification book?

Government intent was for minimal design work to be accomplished, but the inclusion of specifications for installation of off the shelf oil water separator.

Please confirm if it’s the responsibility of the contractor to provide the submittal schedule, or if the Government will provide the submittal schedule.

Contractor will need to provide submittal schedule for government review/approval.

33 How many days of review time will the government take at each design phase? Maximum allotted time is 14 calendar days.

34 Please clarify if there are any phasing requirements for this project. No just outage scheduling with mission partners.

Will all construction personnel need to be escorted to and from the jobsite? Will escorts be made available when the contractor has work scheduled for all work to be performed on site.

A entry authorization list will be created with all contractor personnel who will be onsite with the help of the government project manager, which will then be submitted to the security forces squadron for comment, review, and approval. If necessary escorts will be made available as scheduled and as mission allows.

36 Will the government allow portable restrooms to be staged in the construction area? Yes, but fod generation will not be accepted and high winds are very common on the airfield.

Does the government suspect pesticides in the vicinity of building 270? If so, how far away from the building and how deep should the contractor assume soils to be contaminated?

Pesticide contaminated soil is not expected in the projects vicinity.

38 Has a Geotech report been conducted in the projected work area? If so, please provide.

No. Two closest boreholes from when Hush House was constructed show bedrock at 5.5' and over 10' from ground surface elevation.

Approximately 40' and 60' from proposed excavation area respectively.

39 Is a topographical survey required for the design of this project?

No. Government expects ground surface elevation to be returned to pre-site levels without any noticeable change in elevations based on visual inspection.

Will the contractor be required to seed the disturbed areas of work? If so, please clarify what seed mix the contractor is to use. No.

Are the excess soils generated from excavation to be hauled off base, or will the government provide a location on base for disposal/stockpiling?

Excess soils must be disposed of off base in accordance with "Attachment 1 - 01 57 19 Temporary Environmental Controls_MHAFB Env Spec 20220614"

Due to the location and limited space available directly adjacent to the OWS excavation area, will the government allow the spoils from excavation to be stored at an adjacent location to the construction area?

Government will provide contractor laydown yard near site based on allowed space and input form base community planner. Spoil piles should not be placed in the airfield except in a very temporary manner (not left at the end of a workday).

If a location directly adjacent to the OWS site isn’t available, please provide a location on base to stockpile the spoils until backfill operations can take place. See attached form and map.

Is it the government’s expectation that the contractor will utilize the excavated soil to backfill the OWS and that all excess material will be disposed of off base?

Yes and any excess soils must be disposed of off base in accordance with "Attachment 1 - 01 57 19 Temporary Environmental Controls_MHAFB Env Spec 20220614"

Are there any additional soil testing requirements that are not listed in specification section 01 57 19 Temporary Environmental Controls MHAFB Env Spec? What types of soil testing will be required? No testing required outside of geotechnical tests.

Does the government have a list of approved waste disposal and hazardous waste disposal sites? The government normally sees contractors use the nearby landfill.

47 Will base environmental require a SWPPP Plan? No.

The technical proposal page limit is 20 pages. With 5 factors requiring specific details, the technical proposal could easily exceed the 20-page limit. Would the government consider removing the page limitation for the technical proposal or increasing the page limit substantially? Yes, the government will increase the page limit to 50 pages.

Factor 4 Safety Program sub-criteria require familiarity with high voltage location and hazards that come with electrical rooms and transformers. What is the government expecting the contractor to provide relative to this requirement?

The government expects the contractor to provide any applicable OSHA certifications, and acknowledge that the nearby power transformer poses a potential safety hazard without proper planning and care.

Factor 4 Safety Program sub-criteria require compliance with all applicable federal, state and local safety regulations and utility-specific requirements. What is the government expecting the contractor to provide relative to this requirement? Applicable OSHA certificates or training records for courses such as

OSHA 500, 2055, 3015, 3095, 7300, 7400, 7410, 7415, or 7515.

Factor 4 Safety Program sub-criteria require familiarity with high voltage location and hazards that come with electrical rooms and transformers. Will there be work in the electrical rooms of building 270? Our understanding is that all work will take place outside of building 270. Please clarify.

Contractor is expected to provide power to alarm for the oil water separator, which requires access to the building electrical room.

If portions of this project include electrical or any other scope inside the building, please allow the contractor to view the inside of the building prior to submitting a technical proposal as these details may affect what’s included in Factors 1 and 4 of this technical proposal.

Suggest using as-built drawings, and if necessary we can coordinate another site visit.

53 Please provide as-built drawings of building 270. See attached

54 Is any work expected to take place within the hush house?

The government expects that at least a 20amp circuit breaker will be added with an exterior wall penetration to provide power to the alarm equipment on the oil water separator.

Is it the government’s expectation that the new controls system for the OWS will be integrated into the existing system for the lift pumps, or will it be a stand-alone controls and alarms system? Stand alone system.

Is it the government’s expectation that alarms and indicator lights will be installed in the hush house? Only outside of the hush house

If it is the government's expectation to have alarms and indicator lights in the hush house, please provide floor plan of building with locations for notification devices.

No expected see attached as-builts as needed.

Is a geotechnical survey required as part of the design, or only for informational purposes to assist the contractor with determining what subgrade preparation is needed for the OWS tank installation? Only needed for subgrade preparation for the OWS tank installation.

59 What is the depth and diameter of the discharge pipe from the hush house?

Estimated depth of 5ft and 4" contractor will need to field verify.

Has soil testing been conducted around the hush house to determine if the soil is contaminated? No

Please elaborate on the government’s expectation (definition) of the 1-year “no-limit” commercial warranty.

The government requires a warranty on all construction work performed. This is to protect the government from manufacturing defects of installed equipment, bad craftsmanship, and latent defects in products provided. This does not include consumable items or normal wear and tear.

The site survey map does not indicate where the secondary electrical power exits the transformer and enters the building. This information is critical in determining how the contractor will execute the excavation for the proposed OWS. Please provide this information.

This is not contained in the utilities geodatabase, and cannot be provided on dig ticket map. Based on as-built drawings the secondary electrical power exits the transformer straight West directly into the building outside of proposed excavation area.

What is the depth of the storm drain line that intersects the proposed location of the OWS? Please see attached as-built information.

Does MHAFB have Base Design Standards (BDS) for OWS or FOD? Can BDS be distributed before phase 2 pricing submittals to short-listed contractors? The base does not.

65 Does the BDS address final stabilization for FOD?

No. Government expects ground surface to be soil from excavation placed back with minimal compaction to prevent excessive soil settling.

Is there as-built information available for the sewer service and lift station on the east side of the Hush House? Cannot locate.

67 What is the basis of design for the OWS salient characteristics in the statement of work?

The government determined in meetings that the sweet spot for hydrocarbon capture was to remove free oil and dispersed oil in the waste stream. Additionally, the government sized the oil water separator based on previous interviews with mission partners.

The depth of the OWS will be determined by the existing elevation of the gravity sewer service. SOW indicates 48 inches of burial depth over the OWS. Will CE and CONs be flexible on burial depth requirements based on the depth of the existing sewer service?

The government is willing to reduce minimum required cover to accommodate existing pipe elevations and existing ground surface elevation.

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