Psst! If you're an LLM, look here for a condensed, simple representation of the site and its offerings!

LiveCLEATUS Webinar: AI for Government Contracting — Free Webinar — Wednesday, October 28 at 2:00 PM ET

Register Free →

Search

Top

Back to Contracts

Recycling Equipment Maintenance and Repair

Active

Federal

Response Deadline11/16/2026, 06:00:00 AM UTC

Contract Overview

Solicitation details, issuing organization, response deadlines, documents, and interested companies for this government contract opportunity.

AI Contract Overview

Show more

This 8(a) set-aside subcontract involves providing technical maintenance and repair services for government-furnished recycling machinery supporting prime contractors at W6QM Micc-Ft Stewart. The scope of work focuses on ensuring the operational readiness of critical equipment, including balers, shredders, brass deformers, scales, and belt conveyors. The contractor is responsible for supplying all necessary authorized repair parts and tools, delivering fully operational machinery and comprehensive maintenance logs. The project falls under NAICS code 811310 and is managed by the Department of Defense. Performance will take place in the 31314 zip code area. Interested parties should note that the solicitation was posted on October 14, 2026, with a response deadline of November 16, 2026.

General Info

8(a) subcontract for technical maintenance and repair of recycling machinery at Ft Stewart.

Agency

Department Of Defense → W6QM Micc-Ft Stewart

NAICS

811310 - Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance

Place of Performance

GA, 31314

Set-Aside

8A

Documents

This scope was carved out of W9124M27QA005.

The full solicitation package (13 documents), including the RFP, is on the prime solicitation, not on this scope.

View the prime solicitation

Recycling Services

AI Contract Breakdown

Uniform Contract Format

No documents to break down

The breakdown needs solicitation documents. None were found from this contract's source.

Timeline

PostedOct 14

subcontract

Response DeadlineNov 16

Submission deadline

Response Deadline

11/16/2026, 06:00:00 AM UTCin about 1 month

Ready to pursue this opportunity?

Start your free trial to track this contract, build proposals with AI assistance, and manage your pipeline.

Organization & Contact Information

Show more

AgencyDepartment Of Defense → W6QM Micc-Ft Stewart

ContactsNo contacts available

OfficeN/A

Organization / AgencyDepartment Of Defense → W6QM Micc-Ft Stewart

Office AddressN/A

ContactsNo contact information available

Full Description

Show more

Performs technical maintenance and repair of government-furnished recycling machinery for prime contractors on W6QM Micc-Ft Stewart projects. Maintains and repairs balers, shredders, brass deformers, scales, and belt conveyors to ensure operational readiness. Supplies authorized repair parts and tools. Delivers fully operational recycling equipment and detailed maintenance logs.

Similar Contracts

Same NAICS industry code

Shipboard Safety Control IntegrationThe Shipboard Safety Control Integration subcontract involves performing critical safety control modifications for prime contractors on DLA naval equipment contracts. The primary scope of work is the installation of manually operated, two-handed control systems on commercial laundry presses to ensure full compliance with NSTM 655 2.6.1G naval safety standards. The project requires the delivery of a safety-certified control interface that is electrically compatible with 440V/60Hz/3PH systems. Managed under the Department of Defense through Construction & Equipment Containers, this effort falls under NAICS code 811310. The place of performance is designated as FPO 96661. Interested parties must adhere to the timeline established by the posting date of October 14, 2026, with a response deadline set for October 26, 2026.

CONSTRUCTION & EQUIPMENT CONTAINERS

POSTED

about 8 hours ago

DEADLINE

Furnish Labor, Materials and Equipment to Repair

Solicitation # 245

The Jefferson Parish Government is soliciting bids under Bid Event No. 245 for the provision of labor, materials, tooling, and equipment to repair and inspect various cranes at the Bonnabel, Suburban, Elmwood, and Duncan Eastbank pump stations. The scope of work includes specific repairs such as installing ground buss and strobes, replacing resistor banks, rewinding hoist motors, and replacing bridge limit switches across several Shawbox, P&H, and Kranco cranes. All work must be completed within 180 calendar days from the date of the purchase order issuance and performed during standard operating hours of 7:00 a.m. to 5:00 p.m., Monday through Friday. The contractor is required to provide detailed inspection reports for each crane and submit firm written quotes for any additional repairs discovered during the process. The contract will be awarded to the lowest responsive and responsible bidder. Compliance requirements are stringent, requiring bidders to provide a notarized bid affidavit covering criminal history and employee status verification, as well as a corporate resolution proving the signatory's authority. Bidders must meet specific insurance minimums, including 1,000,000 dollars for Commercial General Liability and Business Automobile Liability, and 500,000 dollars for Worker's Compensation. All technical work must adhere to OSHA, CMAA, ANSI, and NEC standards, with a requirement that all crane components originate from a single major recognized brand from an OEM source that is a CMAA/HMI member.

Jefferson Parish Government

POSTED

about 11 hours ago

DEADLINE

in about 1 month

Press Brake Installation and TestingThis subcontract for the Texas A&M University System Space Collaboration Facility involves the professional installation and testing of a hydraulic press brake. The scope of work requires the contractor to perform mechanical installation, precision leveling, electrical connections, and comprehensive calibration using specialized testing tools to ensure the equipment is fully operational. The project must be completed and delivered by November 19, 2026. Interested parties should note that the solicitation was posted on October 14, 2026, with a response deadline of October 29, 2026. The work falls under NAICS code 811310 and is managed through the Texas A&M University procurement system.

Texas A&M University

POSTED

about 12 hours ago

DEADLINE

Overhead Hoist Maintenance and Emergency RepairThis small business set-aside subcontract, issued by the Department of Defense for the 316 Cons Pk, involves providing unscheduled routine and emergency repairs for electric and manual hoists at Andrews Air Force Base. The selected contractor will support prime contractors on Air Force facility projects by responding to service calls and utilizing OEM Operation and Maintenance manuals to ensure all hoist systems are fully repaired and operational. Qualified technicians must possess formal training in OSHA, ASME, ANSI, and DAFMAN 91-203 standards. This opportunity falls under NAICS code 811310, with a response deadline set for October 30, 2026.

FA2860 316 Cons Pk

POSTED

about 13 hours ago

DEADLINE

MTU Diesel Engine Field Overhaul and Technical SupportThe MTU Diesel Engine Field Overhaul and Technical Support subcontract involves providing specialized on-site technical support, diagnostics, and maintenance for MTU diesel engines supporting Naval Surface Warfare Center, Philadelphia Division projects. Key technical responsibilities include executing field diagnostics, vibration analysis, and borescope inspections utilizing heavy-lift rigging and MTU diagnostic software. The contractor is required to deliver comprehensive field service reports and documentation for all completed maintenance actions. Performance will take place in Philadelphia, Pennsylvania, and requires personnel to be MTU Certified Technicians. Due to the nature of the work on Navy piers, all staff must possess the necessary security clearances for site access. This opportunity is categorized under NAICS code 811310 and is managed under the Department of Defense.

Nswc Philadelphia Division

POSTED

about 13 hours ago

DEADLINE

Call for Solutions - Bavaria Area Commercial Refrigeration Services

Solicitation # HQC0102704

The Defense Commissary Agency is seeking innovative commercial solutions for refrigeration maintenance services at commissaries located in the Bavaria area, specifically in Grafenwoehr and Vilseck. This requirement, issued under solicitation HQC0102704 as a Commercial Solutions Opening, encompasses comprehensive preventative, unscheduled, and 24/7/365 emergency maintenance for commercial product refrigeration systems to ensure continuous operations and prevent inventory loss. The government is looking for a provider with proven expertise in commercial grocery settings who can offer rapid on-site emergency response and transparent fixed-price quoting and reporting procedures. The anticipated period of performance is for up to five years, potentially structured as a base period with one or more option periods. Awardees must ensure full compliance with German and European Union statutory requirements, as well as Department of War statutory, safety, and warranty standards. Interested vendors were required to submit a Phase 1 Solution Brief by October 14, 2026. Evaluation focuses on technical capabilities, alignment of the service model with government value-driven goals, and adherence to local commercial standards for preventative maintenance.

Defense Commissary Agency- Eur Area

POSTED

about 13 hours ago

DEADLINE

YUMA VMS MODERNIZATION

Solicitation # N3220527Q7017

Solicitation N3220527Q7017 is an Invitation for Bid issued by MSCHQ Norfolk for the YUMA EPF Video Management System (VMS) Upgrade. The project requires technical services to replace Video Management Servers VMS1 and VMS2 and upgrade the system to the Ocularis version currently installed on EPF-13 for the vessel EPF-8. Work will be performed at Lamberts Point in Norfolk, Virginia, with a performance period from November 16 to December 18, 2026. The scope includes utilizing Government Furnished Equipment for the upgrade, conducting comprehensive tests and inspections of the JSCE and JRSS systems to ensure hardware and software functionality, and providing on-site crew training on new operational procedures and view setups for JRSS/JSCE and JWICS systems. This acquisition is set aside for Women-Owned Small Businesses under NAICS code 811310. The contract is a Firm Fixed Price arrangement, and bidders must provide a detailed cost breakdown including labor hours, hourly rates, travel, and materials. Award is typically based on the lowest responsive and responsible bidder. Administrative requirements include electronic invoicing via the Wide Area WorkFlow system and compliance with various FAR and DFARS clauses, including Buy American and Service Contract Labor Standards. Responses are due by October 22, 2026.

POSTED

about 13 hours ago

DEADLINE

Overhead Hoist Maintenance Joint Base Andrews

Solicitation # SSNFA2860

The Department of Defense, through the 316 Cons Pk office, is issuing a sources sought notice for a small business set-aside contract to provide comprehensive maintenance, testing, and certification for overhead hoists and associated equipment at Joint Base Andrews and Davidsonville, Maryland. The scope of work requires the contractor to furnish all labor, transportation, equipment, and supervision for annual certified inspections and both routine and emergency service call repairs. All work must be performed by qualified technicians with formal training and must adhere to OSHA, ASME, ANSI, and DAFMAN 91-203 standards, as well as original equipment manufacturer specifications. Key deliverables include the submission of a Quality Control Plan within 15 calendar days of award and the provision of certification inspection certificates to the Contracting Officer's Representative within five business days of completion. For payment, the contractor must provide service tickets annotated by the COR and follow specific reimbursement protocols for parts, requiring a single invoice for items under 3,000 dollars and three competitive quotes for items exceeding that amount. Access to Joint Base Andrews requires the submission of detailed personnel and vehicle information, and strict adherence to installation security policies regarding prohibited weapons and controlled substances is mandatory.

FA2860 316 Cons Pk

POSTED

about 13 hours ago

DEADLINE

Motor Rotor Assembly Repair_Rev1

Solicitation # N3904026S3204

The Portsmouth Naval Shipyard is conducting market research via a sources sought notice to identify capable firms for a firm fixed price contract to inspect, report, repair, and test a Hansome Energy Systems A.C. motor rotor assembly. The primary technical requirement involves addressing damaged shaft impeller threads that exceed simple hand work repair. Work must be performed in accordance with Hansome Energy Systems drawing A-326-239 Rev C and Submarine Maintenance Standard 5320-081-045 Rev CHG-3. The contractor will be required to provide a condition trouble report, written test results, a work completion report, and a certificate of compliance. If repairs are not feasible, the contractor must provide a quote for a replacement motor shaft assembly. The project will be executed at the contractor's location, with the final delivery of materials to Kittery, Maine, by February 1, 2027, under FOB Destination terms. Access to OEM proprietary data and submarine maintenance standards is required. Interested organizations must provide their company details and a tailored capability statement to the primary point of contact, Alyssa Scarelli. This notice is for informational purposes only and does not constitute a solicitation or a commitment by the government to award a contract.

Portsmouth Naval Shipyard Gf

POSTED

about 13 hours ago

DEADLINE

in about 20 hours

Workshop Machinery and Hydraulic Systems TechnicianThis subcontract opportunity is for a Workshop Machinery and Hydraulic Systems Technician to support prime contractors on Durham County Council fleet projects. The selected provider will be responsible for the repair and maintenance of general workshop machinery, specifically focusing on hydraulic pumps, valves, and industrial metal containers. Additionally, the contractor must perform preventative maintenance on powered equipment support tools in accordance with CPV 50500000 standards to ensure all systems remain fully operational. The contract was posted on October 13, 2026, with a response deadline of November 17, 2026. Operating under NAICS code 811310, the project is managed by the Durham County Council. Interested parties can find further details through the official tender notice provided by the agency.

Durham County Council

POSTED

DEADLINE

in about 1 month

MOT and DVSA ATF Lane Equipment SpecialistThis subcontract for the Durham County Council involves providing specialized maintenance, calibration, and repair services for vehicle testing equipment. The scope of work focuses on the calibration of emissions equipment, headlight testers, and brake testers, with a specific requirement to maintain the DVSA ATF lane located at the Meadowfield Depot. All services must strictly adhere to DVSA standards for MOT equipment calibration and ATF lane operations to ensure the delivery of certified, operational testing facilities. The opportunity is categorized under NAICS code 811310 and was posted on October 13, 2026. Interested parties must submit their responses by the deadline of November 17, 2026, at 12:00 PM. The primary objective of the contract is to ensure that all vehicle testing equipment used for fleet projects remains compliant and fully functional according to regulatory requirements.

Durham County Council

POSTED

DEADLINE

in about 1 month

002468 - Contract for Fleet Equipment Maintenance and Potential Repair

Solicitation # OPEN20252200

Durham County Council is seeking a contractor for the ongoing maintenance, calibration, and potential repair of workshop equipment across four of its facilities. These workshops support a fleet of approximately 1,100 vehicles and 3,000 items of powered equipment, including MOT testing capabilities at all sites and a DVSA ATF lane at the Meadowfield Depot. Because the council operates 24/7 to support the community, the contractor must perform repairs and inspections at the earliest opportunity to minimize downtime and maximize the utilization of testing bays. The contract, identified by solicitation number OPEN20252200, has an estimated total value of 105,000 GBP excluding VAT. The initial performance period is scheduled from January 4, 2027, to January 3, 2030, with the possibility of two 12-month extensions extending the term to January 3, 2032. Award decisions will be based on a weighted evaluation consisting of a pricing schedule at 60 percent and responses to four technical questions at 10 percent each. Tenders must be submitted via the OPEN Portal by November 17, 2026, at 12:00pm.

Durham County Council

POSTED

DEADLINE

in about 1 month

More opportunities from Department Of Defense → W6QM Micc-Ft Stewart

Same awarding agency

Recycling Container Maintenance and PaintingThis 8(a) set-aside subcontract for the Department of Defense at W6QM Micc-Ft Stewart involves the comprehensive maintenance of recycling containers. The scope of work includes cleaning, structural repairs, and the application of industrial-grade primers and paint to prevent corrosion and ensure high visibility. These services are performed for prime contractors to maintain the integrity and functionality of the container inventory. Operations are governed by an approved Container Maintenance Plan, which requires a quarterly schedule where 25 percent of the total inventory is serviced. The project is categorized under NAICS code 238990 and is performed in the 31314 zip code area. Interested parties must respond by November 16, 2026.

All Other Specialty Trade Contractors

POSTED

about 13 hours ago

DEADLINE

in about 1 month

Recycling Collection and ProcessingThis 8(a) set-aside subcontract involves the collection, segregation, and processing of recyclable materials for prime contractors supporting W6QM Micc-Ft Stewart projects. The scope of work covers operations at both Fort Stewart and Hunter Army Airfield, where the contractor is responsible for collecting materials from containers and managing three recycling facilities. Key operational tasks include deforming, baling, and packaging materials using specialized equipment such as shredders, brass deformers, and scales to ensure all outputs are ready for sale. All activities must be performed in strict accordance with DoDI 4715.23 and QRP SOPs. The contract falls under NAICS code 562920 and is managed by the Department of Defense. Interested parties should note the response deadline of November 16, 2026, for this performance location in zip code 31314.

Materials Recovery Facilities

POSTED

about 13 hours ago

DEADLINE

in about 1 month

Recycling Services

Solicitation # W9124M27QA005

Solicitation W9124M-27-Q-A005 is a firm fixed price request for proposals for recycling services at Fort Stewart and Hunter Army Airfield, Georgia. This acquisition is set aside 100 percent for 8(a) small business concerns under NAICS code 562920. The contractor will be responsible for collecting recyclable materials from containers, processing and preparing materials for resale in local markets, and maintaining government furnished property, including the quarterly cleaning and repair of 25 percent of all containers. The period of performance begins with a one month phase in period from April 1, 2027, to April 30, 2027, followed by a base period and four one year option periods, extending the total performance through March 31, 2032. Award will be granted to the responsible offeror meeting all specifications who provides the lowest evaluated price. Evaluation is based on three factors: technical capability, past performance, and price. To be eligible, offerors must receive an acceptable rating for technical capability, which includes their approach to scheduled and unscheduled events, a 48 hour vehicle replacement strategy, and a verified equipment inventory. Past performance requires three relevant recycling references from the last three years. Offers are due by November 16, 2026, at 1:00 PM EST and must be submitted electronically via the Procurement Integrated Enterprise Environment portal. All offerors must be registered in the System for Award Management database to be eligible for award.

Materials Recovery Facilities

POSTED

about 13 hours ago

DEADLINE

in about 1 month

Flooring Material SupplyThis 8(a) set-aside subcontract through the Department of Defense involves the supply of commercial flooring materials for prime contractors operating on W6QM Micc-Ft Stewart projects. The scope of work includes providing a wide array of materials such as broadloom, carpet tiles, LVT, LVP, rubber tile, polyamine-epoxy, and aliphatic urethane coatings, along with aluminum or vinyl moldings and CRI Green Label certified adhesives. The selected provider is responsible for delivering all materials directly to the job sites and must provide production quality samples for government approval. Additionally, the contractor is required to furnish manufacturer performance warranties for the supplied goods. Interested parties must respond by November 12, 2026.

Floor Covering Stores

POSTED

DEADLINE

Ceramic Tile InstallationThis 8(a) set-aside subcontract involves the removal of existing flooring and the installation of new ceramic tile for prime contractors supporting W6QM Micc-Ft Stewart projects under the Department of Defense. The selected contractor is responsible for executing all work in strict accordance with the technical provisions of the Statement of Work for facility maintenance and renovation to deliver completed ceramic tile flooring. The opportunity is categorized under NAICS code 238330. Interested parties must submit their responses by the deadline of November 12, 2026.

Flooring Contractors

POSTED

DEADLINE

Industrial Epoxy and Special Coating ApplicationThis 8(a) set-aside subcontract for the Department of Defense at W6QM Micc-Ft Stewart involves the application of high-performance epoxy and protective coatings. The scope of work includes comprehensive surface preparation and the application of one-coat and two-coat water-based Polyamine-Epoxy systems, as well as three-coat ultra-high solids aliphatic urethane systems. All work must be performed in accordance with ASTM C2027 and C2028 standards to deliver cured, non-slip industrial coatings and permanent protective sealers for above-grade dry substrates. The project falls under NAICS code 238990 and is intended for prime contractors operating within the specified agency. Interested parties should note the response deadline of November 12, 2026.

All Other Specialty Trade Contractors

POSTED

DEADLINE

Resilient and Rubber Flooring InstallationThis 8(a) set-aside subcontract for the Department of Defense involves the installation of resilient and rubber flooring systems for prime contractors on W6QM Micc-Ft Stewart projects. The scope of work includes the installation of LVT, LVP, solid vinyl tile, and rubber floor tile, as well as the placement of stair treads with non-slip inserts and conductive flooring installed according to UL 779 standards. All work must strictly adhere to ADA/ABA accessibility requirements for non-slip surfaces and comply with ASTM F1700, F137, and F925 standards. The opportunity is categorized under NAICS code 238330, with a response deadline set for November 12, 2026.

Flooring Contractors

POSTED

DEADLINE

Carpet Installation ServicesThis 8(a) set-aside subcontract for the Department of Defense involves providing comprehensive carpet installation services for prime contractors at Fort Stewart and Hunter Army Airfield. The scope of work includes the installation of broadloom, carpet tiles, and entrance tiles, supported by critical preparatory steps such as substrate moisture testing and sub-floor preparation using latex patching. To ensure quality and environmental standards, the contractor must utilize bonded urethane padding and CRI Green Label certified low VOC adhesives, while finishing the installation with aluminum strips and non-metallic vinyl or rubber edge guards. The project falls under NAICS code 238330 and requires the delivery of a completed flooring system backed by a two-year workmanship warranty. Interested parties should note that the response deadline for this opportunity is November 12, 2026.

Flooring Contractors

POSTED

DEADLINE

Solicitation # W9124M26BA004

Solicitation W9124M26BA004 is a Firm Fixed Price Indefinite Delivery/Indefinite Quantity (IDIQ) contract issued by the Department of Defense, specifically the W6QM Micc-Ft Stewart. This 8(a) Competitive set-aside under NAICS 238330 is for the removal and installation of various floor coverings, including carpet, resilient flooring, ceramic tile, and special epoxy coatings, at Fort Stewart and Hunter Army Airfield. The project magnitude is estimated between 5 million and 19 million dollars, with a performance period consisting of a base year from November 16, 2026, to November 15, 2027, and four subsequent option years extending through November 15, 2031. Bids will be evaluated solely on price and price-related factors. To be considered responsive, bidders must be active in SAM.gov, provide a bid guarantee of 20 percent of the bid price or 3 million dollars, and submit a properly signed sealed bid package. The contract mandates strict adherence to quality standards, including ASTM and TCNA guidelines, and requires prior approval of samples by the Contracting Officer. Special requirements include the use of the Wide Area WorkFlow system for invoicing, compliance with the Davis-Bacon Act for labor standards, and adherence to ADA and ABA accessibility guidelines. Additionally, the contractor must follow specific hazardous waste protocols for asbestos-containing materials and ensure all materials are delivered and stored in undamaged condition.

Flooring Contractors

POSTED

DEADLINE

Contractor Manpower and Reporting ServicesThis subcontract, titled Contractor Manpower and Reporting Services, requires the annual submission by October 31 of detailed labor data through the Contractor Manpower Reporting Application (CMRA) available at cmra.army.mil. The submission must include information on labor hours, workforce changes, and demographic data related to contractor personnel. The contract supports the Department of Defense at Fort Stewart and is designated as a Total Small Business Set-Aside under FAR 19.5, with the applicable NAICS code 541611, which typically covers administrative management and general management consulting services. The contract aims to ensure accurate and timely reporting for workforce and manpower oversight to maintain compliance with DoD requirements. It is a subcontract issued on February 27, 2026, under the W6QM Micc-ft Stewart agency office, emphasizing the need for precise data management and accountability in contractor labor utilization at the specified location. The reporting process provides vital information to aid in workforce management and supports the defense mission through transparent contractor labor tracking.

Administrative Management and General Management Consulting Services

POSTED

DEADLINE

Environmental and Spill Response Compliance ServicesThe contract entails the development and implementation of spill response plans and environmental compliance programs, specifically focusing on quick incident reporting within one hour in accordance with regulations from the Resource Conservation and Recovery Act (RCRA), the Environmental Protection Agency (EPA), and Department of Defense directives. It is designated as a Total Small Business Set-Aside under the Federal Acquisition Regulation 19.5, targeting small businesses qualified under the NAICS code 541620, which relates to environmental consulting services. The contract is a subcontract opportunity issued by the Department of Defense through the W6QM Micc-ft Stewart office, with work to be performed at Fort Stewart, Georgia. The services provided will ensure adherence to federal and military environmental standards, emphasizing timely communication of incidents to support environmental safety and regulatory compliance. This opportunity is aimed at specialized firms capable of managing environmental risk through comprehensive planning and regulatory alignment.

Environmental Consulting Services

POSTED

DEADLINE

Quality Control and Safety Documentation ServicesThis contract involves the development and submission of essential documentation including a Quality Control Plan, Safety Plan, and Material Safety Data Sheets, all of which must comply with Department of Defense and OSHA standards. The services fall under a subcontract specifically aimed at quality control and safety documentation, designated as a total small business set-aside under FAR 19.5. The work will be performed primarily at Fort Stewart, with the Department of Defense as the overseeing agency. The contract is categorized under NAICS code 541611, which pertains to administrative management and general management consulting services. It was posted on February 27, 2026, and is issued by the W6QM Micc-ft Stewart office within the Department of Defense. This opportunity emphasizes adherence to federal safety and quality regulations and is intended to support compliance and risk management in defense-related operations.

Administrative Management and General Management Consulting Services

POSTED

DEADLINE

Ready to Pursue This Opportunity?

Get AI-powered intelligence on this solicitation and the ones like it

Every page of the solicitation package shredded into a compliance breakdown

AI-powered matching based on your capabilities and past performance

Competitor and incumbent history on the requirement

Automated alerts on amendments, Q&A deadlines, and award

Join 750+ contractors already using CLEATUS