Y--CAVE 332397 ¿ Replace Main Distribution System

Amendment / Modification

This amendment (0002) to solicitation 140P2026R0007, effective 11/07/2025, provides the location and map for the site walk.

• Item 14: Description of Amendment/Modification

• No changes to proposal deadlines or submission requirements are indicated.

Other / Unclassified

This document provides information regarding the pre-bid meeting location for an unspecified opportunity. It includes images of directional signs, a map with a highlighted route, and specific meeting instructions.

Potential bidders should note the following details for the pre-bid meeting:

• Location: Meet outside the Facilities Maintenance Building parking lot.
• Time: 9:00 am MST.
• Directions: The approximate grid coordinates for a left turn are 32.180083, -104.443746. Bidders should look for signs, including those indicating "Caverns" and "Maintenance," as well as a "Service Road Employees Only" sign.

Form / Attachment / Pricing Sheet

This document is a map illustrating the layout of Park Housing Units at Carlsbad Caverns National Park, New Mexico. It provides directions to the housing area and a legend to identify different types of buildings.

• Map Layout: Depicts various housing units, offices/workspaces, maintenance yard, fitness room, mailboxes, and a housing office.
• Legend: Differentiates between 'Other Buildings', 'Offices/Workspaces', 'Permanent Housing', 'Seasonal Housing', and 'Researcher Housing' using color coding.
• Directions: Provides step-by-step driving instructions to reach the housing area from US Hwy 62/180.
• Contact Information: Includes a phone number (605-891-1372) and handwritten notes referencing 'Rattlesnake Springs House #22' with associated numbers (PMIS 163363, 219696).
• Production Information: States it was produced by P. Lindstrom, Resource Stewardship & Science, in June 2009.

This map is relevant for bidders who may need to understand the physical layout of facilities, including housing and office spaces, within Carlsbad Caverns National Park. It can help in visualizing the location of potential work sites or accommodations if the opportunity involves operations or personnel within the park.

Amendment / Modification

This amendment modifies solicitation 140P2026R0007, effective November 7, 2025.

• Purpose: To provide information for a second site visit.
• Site Visit Details: The site visit is scheduled for Wednesday, December 17, 2025, at 08:30 MT Standard.
• RSVP: Potential attendees must RSVP by email to Edwin Berry (edwin_berry@nps.gov) and Brian Baugh (brian_baugh@contractor.nps.gov) by December 01, 2025, no later than 14:00 MT Standard.

This amendment pertains to the solicitation itself, not a modification of an existing contract/order.

This amendment provides information for a site visit and includes RSVP instructions and deadlines. It does not appear to change the proposal submission deadline or evaluation factors, but bidders should confirm any impact on their offer preparation.

Specifications

This document contains specifications for various components and systems related to the "Modernize Sewer System, BFD Lift Station, and 8" Watermain" project at Carlsbad Caverns National Park. It details requirements for:

• General Requirements: Includes definitions, submittals, quality assurance, and coordination procedures.

• Existing Conditions: Outlines procedures for maintaining existing conditions, including protection of survey markers, pavement restoration, and handling of existing utilities.

• Demolition and Salvage: Specifies the removal of existing structures and materials, including the bat flight draw lift station, sewer pipes, manholes, asphalt, concrete, rock, stair railings, fire hydrant, and vegetation. It also details material ownership and disposal.

• Concrete for Site Improvements: Covers requirements for patching concrete sidewalks, including materials, composition, proportioning, mixing, placing, curing, and weather protection.

• Concrete Finishing for Sidewalks: Details the forming, finishing, and jointing of sidewalks, curbs, and concrete asphalt.

• Utility Line Marking: Specifies the use of marking tape and tracer wire for buried utilities.

• Trench Excavation and Backfill: Outlines procedures for excavation, trenching, backfilling, dewatering, and protection of existing properties.

• Flowable Fill: Details the use of flowable fill (CLSM/CDF) as backfill material.

• Tree Protection: Specifies requirements for protecting trees and shrubs within construction limits.

• Aggregate Sub-Base Course & Base Course: Covers the furnishing and placement of aggregate materials for pavement preparation.

• Asphalt Concrete Pavement: Details the production, placement, and testing of asphalt concrete pavement.

• Water Distribution Systems: Includes specifications for water main pipe, fittings, valves, fire hydrants, and tracer wire.

• Sanitary Sewer Collection Systems: Outlines requirements for gravity sewer pipe, force main pipe, manholes, and bypass pumping.

• Onsite Wastewater Lift Station: Specifies requirements for the lift station, including pumps, controls, wet well, valve vault, and electrical components.

• Electrical Systems: Covers low-voltage electrical power conductors and cables, grounding and bonding, enclosed switches and circuit breakers, surge protection, raceway and boxes, and identification.

• Closeout Procedures: Details requirements for project record drawings, closeout submittals, final inspection, and warranties.

• Operation and Maintenance Data: Specifies requirements for preparing operation and maintenance manuals.

• Modernization of the sewer system, bat flight draw lift station, and 8" watermain.

• Demolition and replacement of existing sewer infrastructure.

• Installation of new HDPE force main and water main.

• Protection and preservation of historic structures and natural resources.

• Compliance with all applicable federal, state, and local regulations.

• Detailed submittal requirements for materials, shop drawings, and plans.

• Specific testing and quality assurance procedures for all systems.

• The document is dated June 2024 and includes specifications for various construction elements.

• Submittals are required for product data, shop drawings, qualification data, and test reports.

• Quality assurance measures are detailed throughout the document, emphasizing compliance with industry standards and regulations.

• Not specified in this document.

• This document serves as a comprehensive set of specifications for the "Modernize Sewer System, BFD Lift Station, and 8" Watermain" project.

Solicitation / RFP / RFQ

This solicitation is for the "Replace Main Water Distribution" project at Carlsbad Caverns National Park, New Mexico. The existing water system, installed between 1932 and 1964, is aging and has been repeatedly patched. This project aims to replace the entire system to ensure the integrity of the park's primary resource (the Caverns) by preventing leaks. It will also address non-compliant fire hydrants and modernize the park's water infrastructure to ensure a sustainable water supply for employees and visitors.

• Replacement of the aged water distribution system in the historic area.

• Installation of a Master Meter Pit.

• Relocation of the Bat Flight Draw Lift Station.

• Replacement of the 8" water transmission line in Bat Cave Draw.

• Work includes tasks such as clearing, demolition, rock trenching, piping, bypass and temporary waterlines, rock crushing, and hardscape/landscape repair.

• Fire hydrants must meet NFPA Fire code.

• Contract Type: Firm-Fixed-Price (FFP)

• Period of Performance: Not explicitly stated, but completion of work is required no later than 390 calendar days from the notice to proceed.

• Liquidated Damages: $1,498 per calendar day of delay.

• Proposals must conform to the solicitation documents with pricing for Base line items and all option line items.

• Failure to provide pricing for Attachment 09 Contract Price Schedule may render the proposal unacceptable.

• Evaluation will be based on a Best Value Continuum Tradeoff Process, considering non-price factors (Project Experience, Technical and Management Approach, Schedule, Key Personnel Experience, Past Performance, Small Business Participation) and Price. Non-price factors are of equal importance and collectively are approximately equal to price.

• Proposals must be submitted via email by the due date and time specified.

• Not explicitly stated in the provided sections, but standard FAR clauses related to small business representations apply.

• Specifications and drawings are attached and incorporated by reference (Section J).

• A preconstruction conference may be conducted.

• Offerors are responsible for site visits and understanding all conditions.

• Specific clauses regarding Buy American, labor standards, and payment processing (e.g., Invoice Processing Platform - IPP) are included.

Form / Attachment / Pricing Sheet

This document is a geophysical survey report for the Carlsbad Caverns National Park, detailing the findings of electrical resistivity (ER) tomography and ground penetrating radar (GPR) surveys. The primary objective was to detect subsurface voids along the proposed alignment for a new electrical duct bank and to identify existing utilities within a 30-foot corridor of this alignment.

• Methodology: Utilized Electrical Resistivity Tomography (ER) and Ground Penetrating Radar (GPR) to identify subsurface anomalies, and an RD8000 Locator and GPS for utility mapping and coordinate control.
• Scope: Surveyed areas included the electrical substation access, Visitor's Center parking lot, park offices, and residential buildings.
• Findings: The report details identified anomalies, including potential voids and existing utilities. Specific ER and GPR anomalies are mapped and described, with coordinates provided for interpreted voids.
• Appendices: Includes detailed data and interpretations for ER surveys (Appendix B), GPR surveys (Appendix C), and utility mapping results (Appendix D).

This report provides critical subsurface information relevant to any construction or excavation activities planned along the proposed electrical duct bank alignment. Bidders can use this data to understand potential geological challenges (voids) and the existing utility landscape, which will inform project planning, risk assessment, and cost estimation.

Form / Attachment / Pricing Sheet

This document is a template for reporting on the "Limitations on Subcontracting" clause, required for small business set-aside service contracts (including construction) priced at or above $150,000. It serves as a tool for prime contractors to track and report their compliance with subcontracting requirements.

• Contract Information: Fields for Contract Number, Prime Contractor, Current Total Contract Price, Type of Set Aside, and Period of Performance.
• Type of Service (Required Participation): Checkboxes to indicate the applicable subcontracting limitation percentage based on the type of service (Services, General Construction, Construction by Special Trade).
• Participation Calculation: Sections to detail amounts invoiced by the prime contractor, amounts paid to Similarly Situated Subcontractors (SSS), and amounts paid to Non-Similarly Situated Subcontractors (NSS). It includes fields for calculating the Prime & SSS Participation % and the % subcontracted to NSS.
• Definitions: Clarifies what constitutes a "Similarly Situated Subcontractor (SSS)".
• Corrective Action Plan: A section for the prime contractor to provide a written plan if the subcontracting percentages are not in compliance.

Bidders, particularly small businesses, should review this template to understand the reporting requirements related to subcontracting limitations. This document helps clarify the expected subcontracting percentages for different contract types and the method for calculating compliance. It highlights the importance of tracking SSS and NSS participation and the potential need for a corrective action plan if compliance is not met.

Form / Attachment / Pricing Sheet

This document is an attachment to a SAM.gov opportunity record, specifically a geophysical investigative report. It details the findings of Ground Penetrating Radar (GPR) and Frequency Domain Electromagnetic (FDEM) surveys conducted in various areas (Area 1, Area 2, Area 3, and Area 4) of Carlsbad Caverns National Park.

• GPR Scanlines: Presents radar profiles showing subsurface anomalies, interpreted as potential fractured rock, voids, or utility trenches.
• FDEM Results: Displays apparent conductivity maps indicating areas of low conductivity, which may suggest fractured rock, vugs, or near-surface voiding, increasing the potential for karst features.
• ERT Anomalies: Presents Electrical Resistivity Tomography (ERT) data, identifying highly resistive zones that could indicate competent limestone or air-filled karst features, and low resistivity zones potentially related to weathered limestone or clay-filled solution zones.
• Geographic Data: Includes coordinate systems (New Mexico East, ftUS) and detailed maps showing the locations of survey lines and identified anomalies.

This report provides critical subsurface geological and hydrological information for the surveyed areas. Bidders involved in construction, environmental assessment, or infrastructure projects within or near these areas of Carlsbad Caverns National Park would find this data highly relevant for understanding potential ground conditions, risks associated with karst topography, and the presence of subsurface utilities. The detailed anomaly maps and interpretations can inform site suitability, risk assessment, and planning for any ground-disturbing activities.

Form / Attachment / Pricing Sheet

This document is a General Decision Number (GDN) for minimum wage rates applicable to heavy construction projects in specific counties within New Mexico. It serves as a mandatory attachment for federal contracts to ensure compliance with labor standards.

• Applicable Executive Orders: Details the applicability of Executive Order 14026 and Executive Order 13658 for contracts entered into or renewed on or after January 30, 2022, and for contracts awarded between January 1, 2015, and January 29, 2022, respectively.
• Minimum Wage Rates: Provides specific minimum hourly wage rates and fringe benefits for various construction trades (e.g., Electrician, Ironworker, Carpenter, Laborer, Operator, Plumber, Pipefitter, Truck Driver) across different counties and zones within New Mexico.
• Geographic Scope: Covers heavy construction projects in De Baca, Eddy, Grant, Hidalgo, Lea, Lincoln, Luna, Roosevelt, Sierra, and Socorro Counties.
• Zone Definitions: For some trades, wage rates vary based on mileage from a main post office, with defined zones and percentage increases.
• Executive Order 13706 (Paid Sick Leave): Notes that this EO applies to contracts awarded on or after January 1, 2017, requiring contractors to provide paid sick leave.
• Wage Determination Appeals Process: Outlines the procedures for appealing wage determination decisions.

Bidders must review these wage determinations to accurately estimate labor costs for their proposals. Failure to comply with the specified minimum wage rates and fringe benefits can lead to contract non-compliance. The document is crucial for understanding the labor cost component of the opportunity and ensuring competitive and compliant bidding.

Form / Attachment / Pricing Sheet

This document, "Section_J_Attachment_9_Contract_Price_Schedule.xlsx", provides the detailed breakdown of CLINs (Contract Line Item Numbers) and associated costs for the "CAVE WATER AND SEWER" project, identified by PMIS 332397-313146-317759. It includes a base CLIN and three option CLINs.

CLIN 1: REPLACE AGED WATER DISTRIBUTION SYSTEM IN HISTORIC AREA

• Borings - Ground Truth Specified Zones
• Clearing, Trenching, & Demolition (Pipe, Hydrants, Trench to Rock)
• Rock Trenching
• Water Distribution Piping & Appurtenances
• Hardscape & Landscape Repair
• Bypass and Temporary Waterlines
• Rock Crushing

OPTION 1: MASTER METER PIT

OPTION 2: RELOCATE BAT FLIGHT DRAW LIFT STATION

• Clear & Demo (Lift Station, Pipe, Trench to Rock)
• Bypass Pumping
• Rock Trenching
• Conveyance Piping, Manhole Modifications, and Comfort Station Modification
• Lift Station, Pumps, Controls, & Electrical
• Shade Structure and Pump Hoist
• Hardscape and Landscape Repair

OPTION 3: REPLACE 8" WATER TRANSMISSION LINE IN BAT CAVE DRAW

• Borings - Ground Truth Specified Zones
• Rock Trenching
• Conveyance Piping & Appurtenances
• Hardscape & Landscape Repair

Both sheets indicate a Grand Total of $0.0 for all CLINs and Options, suggesting that pricing details are to be filled in by the bidder or are provided in a separate document.

Bidders must use this schedule to understand the scope of work associated with each CLIN and Option. They will need to provide unit prices and calculate total prices for each line item to complete their proposal. The structure of this schedule will dictate how pricing information must be presented.

Solicitation / RFP / RFQ

This solicitation is for a full and open competition for construction services related to the "Replace Main Distribution" project (CAVE 332397). The North American Industrial Classification System (NAICS) code and associated small business size standard are detailed in section K. The estimated magnitude of construction is more than $10,000,000.

• The document references "sections B through J" and attachments for detailed information and requirements.

• Offerors must include all Federal, state, and local taxes in their proposals, as the project is not tax-exempt.

• The performance period is 390 calendar days after receipt of a notice to proceed.

• A pre-proposal site visit is mentioned in section L.

• Proposal submittal requirements are detailed in section L.

• Offerors must submit proposals and questions, and acknowledge solicitation amendments as stated in section L.

• Offers must be valid for at least 90 calendar days after the due date.

• Offers are due by 1400 local time on January 7, 2026.

• Offers must be submitted in original and [number not specified] copies.

• Offer guarantees are required.

• This acquisition is being conducted as a "full and open competition."

• Offerors should refer to section K for NAICS code and small business size standard.

• Offerors must acknowledge solicitation amendments.

• Performance and payment bonds are mandatory.

Form / Attachment / Pricing Sheet

This document, "Section J Attachment 6d 2022 CAVE Geophysical Investigative Report," is an attachment to a SAM.gov opportunity. It details the findings of geophysical surveys conducted in various areas (Area 4, Area 5, and Area 6) within Carlsbad Caverns National Park.

• Geophysical Survey Methods: The report utilizes Ground Penetrating Radar (GPR) and Frequency Domain Electromagnetic (FDEM) methods to investigate subsurface conditions.
• Areas Surveyed: Specific areas within the park (Area 4, Area 5 North, Area 5 South, and Area 6) were surveyed.
• Data Presentation: Results are presented through maps showing apparent conductivity and resistivity, as well as cross-sections illustrating subsurface anomalies.
• Interpretation: The report interprets anomalies as potential indicators of fractured rock, vugs, voids, or areas of interference from subsurface infrastructure. It also notes areas of lower data quality.

This report provides critical subsurface information relevant to any opportunity requiring work within these surveyed areas of Carlsbad Caverns National Park. Bidders should review the geophysical findings to understand potential subsurface conditions, risks, and complexities that may impact project planning, execution, and cost. Specifically, the presence and location of identified anomalies (potential voids, fractured rock, or infrastructure) are key considerations for site assessment and work planning.

Form / Attachment / Pricing Sheet

This document contains construction drawings for the "Modernize Sewer System, Bat Flight Draw Lift Station, and 8" Watermain" project at Carlsbad Caverns National Park. It provides detailed plans, profiles, and specifications for the proposed upgrades.

• Cover Sheet (Sheet 1 of 42): Project title, location, park name, region, county, drawing number, PMIS/PKG numbers, and revision history.
• General Notes (Sheet 2 of 42): Outlines contractor responsibilities regarding utility protection, site conditions, storm water management, invasive plant prevention, archaeological monitoring, and site restoration.
• Sheet Index (Sheets 2-42): Lists all drawings included in the set, detailing the scope of each sheet (e.g., General Notes, Legend, Site Maps, Watermain Plans, Sewer Plans, Lift Station Details, Electrical Plans).
• Legends and Abbreviations (Sheet 3 of 42): Defines symbols and abbreviations used throughout the drawings for existing and proposed conditions.
• Site Maps (Sheets 4-7): Includes Existing Conditions Map, Geophysical Site Map, Staging Area Overview Map, and Staging Area Maps, providing topographical and risk assessment information.
• Watermain Plans (Sheets 8-12): Details the proposed 8-inch watermain replacement, including site overview, plan and profiles, and specific water details.
• Sanitary Sewer System Plans (Sheets 11-26): Covers the site overview, demolition maps, bypass pumping plans, and detailed plan and profiles for the sanitary sewer system upgrades, including dual containment piping.
• Lift Station Details (Sheets 25-34): Provides detailed plans, profiles, and specifications for the new Bat Flight Draw Lift Station, including structure details, control panel information, and site photos.
• Electrical Plans (Sheets 36-51): Includes electrical cover sheets, power plans, one-line diagrams, and detailed control panel wiring and details for the lift station and associated systems.

These drawings are critical for bidders to understand the full scope of work, including the extent of demolition, new construction, specific materials, site constraints (e.g., historic features, existing utilities), and required safety and environmental protocols. They form the basis for estimating costs, developing construction methodologies, and ensuring compliance with project requirements.

Form / Attachment / Pricing Sheet

This document contains construction drawings for the "Replace Aged and Failing Water System" project at Carlsbad Caverns National Park. It details the existing conditions, proposed water system layout, demolition plans, natural resource protection measures, staging areas, and specific construction details.

• Sheet Index: Provides a comprehensive list of all drawings included in the set.
• General Notes: Outlines critical project requirements, responsibilities, and procedures for the contractor.
• Site Overview & Layout: Illustrates the overall project area and the proposed water system.
• Demolition & Restoration Details: Specifies how existing infrastructure is to be removed and the site restored.
• Water System Details: Includes specific details for various components such as fire hydrants, valves, meter vaults, and pipe connections.
• Natural Resource Protection: Details measures to protect local flora and fauna during construction.
• Staging Areas: Identifies designated areas for construction materials and equipment.

These drawings are essential for bidders to understand the full scope of work, including the extent of demolition, new installations, site constraints, and environmental considerations. They provide the technical specifications required for accurate bidding and project execution.

Form / Attachment / Pricing Sheet

This document is a "Hydrant Test Report" form. It is intended to be used in conjunction with a hydrant location map to record the results of hydrant testing. The testing is to be performed in accordance with the American Water Works Association Manual of Water Supply Practices M17.

• Fields for Manufacturer & Date, and Report Number.
• A table with columns for: Date, Time, Nozzle Size, Coeff., Pressure (Static, Residual, Pitot), Flow (gpm), Flow (20 psi), Time (minutes), and Water Used (gal).
• A note specifying that the report should be used with the hydrant location map and that testing must follow AWWA M17 standards.

This form is likely an attachment to a solicitation or SOW related to the maintenance, testing, or inspection of fire hydrants. Bidders may be required to use this specific form to document their testing activities as part of their proposal or as a deliverable under a contract. It outlines the specific data points and standards required for hydrant testing.

Specifications

This document contains specifications for the "Replace Aged and Failing Water System Administration and Housing Area" project at Carlsbad Caverns National Park. It details various technical requirements for construction, including:

• General Requirements (Division 01): Covers administrative and procedural aspects such as submittals, project management, construction schedules, safety, quality control, and waste management.

• Existing Conditions (Division 02): Outlines procedures for maintaining existing conditions, demolition, and salvage.

• Concrete (Division 03): Specifies requirements for concrete for site improvements, including sidewalks and precast concrete vaults.

• Masonry (Division 04): Details procedures for masonry mortaring, specifically for historic stone masonry.

• Earthwork (Division 31): Includes specifications for site clearing, rock excavation, trench excavation and backfill, soil erosion and sediment control.

• Exterior Improvements (Division 32): Covers tree protection, aggregate sub-base course, aggregate base course, asphalt concrete pavement, and revegetation.

• Utilities (Division 33): Includes disinfection of water utility piping systems, utility line marking, water distribution system appurtenances, and fusible high-density polyethylene pipe and fittings.

• Water System Replacement: The core of the project involves replacing aged and failing water mains and service lines in the Housing and Administrative area.

• Materials: Specifications detail requirements for concrete, masonry, earthwork, asphalt, revegetation, and various utility components (pipe, fittings, hydrants, valves, meters).

• Environmental and Safety: Emphasis is placed on protecting archaeological resources, historic properties, natural resources (trees, vegetation), managing noise, controlling storm water pollution, and maintaining a safe work environment.

• Project Management: Requirements for construction schedules, submittals, quality assurance, waste management, and closeout procedures are outlined.

• Project Location: Carlsbad Caverns National Park (CAVE), Carlsbad, New Mexico.

• PMIS Number: 332397

• Specifications Date: March 2025 (Project Manual), with various specification sections dated 02/28/2025.

• Bidders must adhere to all specified requirements, including submittals, quality assurance, and safety protocols.

• Specific attention should be paid to historic preservation, archaeological protection, and environmental regulations.

• Not explicitly stated in this document, but adherence to NPS regulations and standards is required.

• The document is extensive, covering numerous technical specifications for various construction trades and project management aspects.

Form / Attachment / Pricing Sheet

This document is a Geophysical Investigative Report for CAVE Geophysical Survey Services at Carlsbad Caverns National Park. It details the methods, results, and conclusions of geophysical surveys conducted to assess and map the risk of voids and karst features in the shallow subsurface. The primary goal was to support the National Park Service's Facilities Management program for future below-grade utility work.

• Methods Used: Ground Penetrating Radar (GPR), Frequency Domain Electromagnetics (FDEM), and Electrical Resistivity Tomography (ERT).
• Survey Areas: Six distinct areas within the park were surveyed.
• Objectives: To identify karst features and voids, with specific targets for features 6 feet in diameter or larger down to 20 feet below ground surface, and voids larger than 50 feet in diameter down to 50 feet below ground surface.
• Results: Interpretation of geophysical anomalies indicating potential for near-surface karst, including open voids. Risk assessment maps were developed for each area.
• Conclusions: The report provides conclusions based on the integrated geophysical interpretations and site observations.

This report provides critical subsurface information relevant to any potential bidder involved in future underground utility work or construction within the surveyed areas of Carlsbad Caverns National Park. Understanding the identified risks of voids and karst features is essential for accurate project planning, risk assessment, and cost estimation. The detailed methodologies and results can inform bidders about the site's geological conditions and potential subsurface challenges.

Form / Attachment / Pricing Sheet

This document, "Section J Attachment 6b 2022 CAVE Geophysical Investigative Report," presents the findings of geophysical surveys conducted at Carlsbad Caverns National Park. Its primary purpose is to identify and map potential subsurface voids and karst features to inform future utility improvements and shallow excavation plans. This information is critical for potential bidders to assess risks and plan their work.

• Geophysical Survey Data: Utilized Ground Penetrating Radar (GPR), Frequency Domain Electromagnetics (FDEM), and Electrical Resistivity Tomography (ERT) to assess shallow subsurface conditions.
• Risk Assessment: Presents "Combined Risk Maps" for six surveyed areas, categorizing zones into "Interpreted High Risk" and "Interpreted Moderate Risk." These maps indicate the potential for karst features, open voids, and dissolution.
• Definitions of Risk: High Risk areas suggest significant potential for karst features and open voids (features >6ft diameter within upper 20ft), while Moderate Risk areas indicate minor/moderate anomalies with potential for smaller or deeper features.
• Digital Deliverables: Geospatially referenced risk zone polygons were delivered in AutoCAD (.dwg, .dxf) and Esri Shapefiles (.shp) formats.
• Anomalies Identified: Includes data on GPR anomalies (high amplitude reflections/diffractions) and ERT anomalies (highly resistive zones), indicative of potential near-surface karst features and voiding.
• Subsurface Utilities: Maps showing the location of existing and proposed subsurface utilities are included.
• Methodology & References: Details the geophysical methods used and references relevant geological and geophysical literature.

This report is crucial for bidders to understand the subsurface conditions and potential geological hazards at Carlsbad Caverns National Park. The risk zone maps and anomaly data directly inform bidders about areas requiring careful consideration due to potential karst features, which could impact construction, design, operations, safety, costs, and timelines. Reviewing this report is essential for developing accurate proposals and project plans.