Annex L - Wastewater Services (503).docx

Annex L Wastewater Services (503)

Annex L – Wastewater Services (503) (U)

TABLE OF CONTENTS

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GENERAL INFORMATION

Overview . The Fort Huachuca sanitary wastewater treatment and collection system collects and delivers sanitary wastewater to the wastewater treatment plants (WWTPs) by means of gravity sewer mains and laterals as well as pressurized force mains and approximately twenty-seven (27) lift stations. There are approximately 976,800 linear feet of sewer mains, or 185 linear miles, ranging from four (4) inches to twenty-four (24) inches in diameter, thirty-three (33) oil/water separators, and 950 manholes.

Components . Sanitary wastewater treatment and collection system components include, but are not limited to, electrical, electronic, and digital systems and controls, level controls, control panels, emergency generators, switches, metering devices, reuse basins, recharge basins, lift stations, wet wells, head works, tertiary treatment, biological reactors, pumps, motors, air compressors, filters, piping, indicator lights, mounting hardware, meters, valves, and fittings, and laboratory equipment and components.

Domestic sewage from both Fort Huachuca and Huachuca City is approximately 570,000 gallons per day. The Contractor's maintenance responsibility shall begin at the furthest building at Black Tower and at the boundary fence behind Huachuca City. Wastewater is collected throughout the fort and conveyed to WWTP #2 by means of an underground pipe network. The maintenance boundary begins where the line exits each building. The Contractor’s responsibility in the housing areas shall be limited to main lines and manholes.

The WWTP utilizes primary, secondary, and tertiary treatment. It is designed for ninety-seven (97) to ninety-nine (99) percent removal of Biochemical Oxygen Demand (BOD) and ninety-seven (97) percent removal of total suspended solids. Currently, the average flow is 0.570 million gallons per day (mgd). The WWTP-permitted design is 2.0 mgd and is intended to satisfy requirements of the current Aquifer Protection Permit (APP), No. P-100840, LTF93227, and Reuse Permit (R105690). A brief description of the major operational units in the WWTP can be found in the APP.

Work Management and Control

0. Reporting Requirements . The Contractor shall submit to the Contracting Officer’s Representative (COR)/Alternate COR (ACOR) for approval, a Sanitary Wastewater Treatment and Collection System Operations Plan for accomplishing the operations described in this Performance Work Statement (PWS) within thirty (30) calendar days of contract award.

The Contractor shall prepare and submit to the COR/ACOR by the tenth (10th) day of each month a copy of Department of the Army (DA) Form 4247, Facilities Engineering Operating Log (Sewage General), and DA Form 4178, Facilities Engineering Operating Log (Sewage Supplementary). The Contractor shall also maintain a daily operator's log that includes routine operational duties, unusual conditions, accidents, and complaints.

Certification . The Contractor shall provide certified operators in compliance with federal, Arizona Department of Environmental Quality, and environmental regulations. WWTP #2 is currently rated as a Grade 4 Treatment Faciality.

DESCRIPTION OF SERVICES

The Contractor shall operate the sanitary wastewater treatment and collection system and components in accordance with (IAW) Army Regulation (AR) 4201 – Army Facilities Management, Technical Manual (TM) 58141 – Sanitary and Industrial Wastewater Collection - Gravity Sewers and Appurtenances, TM 58142 – Sanitary and Industrial Wastewater Collection - Pumping Stations and Force Mains, Operations & Maintenance (O&M) manuals, and manufacturer’s specifications.

WWTP Operation . The Contractor shall operate the WWTPs twenty-four (24) hours per day, seven (7) days a week. Operations shall follow the APP permit and Reuse permit. Any violation of the APP permit or Reuse permit standards shall be reported to the COR/ACOR within two (2) hours of the incident with a detailed explanation of the noncompliance. Typical daily operating tasks shall include, but not be limited to, adjusting variable frequency drives, clarifier washing, wasting activated sludge, ultraviolet tube changing and cleaning, chemical feed and dosage rate adjustments, repacking of pumps, changing of charts, preparing sludge beds, coordinating with the Directorate of Public Works (DPW) for sludge removal, calibration, and adjustment of electric and electronic controls, etc.

Laboratory Testing . The Contractor shall operate and perform operational laboratory testing in the WWTP laboratory at Building 90718, IAW requirements established in the APP permit, along with additional standard plant operational analysis. Testing shall include, but not be limited to, suspended solids, BOD, Chemical Oxygen Demand, solids settling, pH, percent solids, volatile solids, Dissolved Oxygen, nitrite, nitrate, ammonia, chlorine residual, microscopic examination total nitrogen, and fecal coliform. The Contractor shall maintain laboratory worksheets (bench sheets), daily meter reads, and operating logs.

On-Site Operator . The Contractor shall provide an on-site certified operator twenty-four (24) hours a day, seven (7) days a week. The Contractor shall perform continuous WWTP operation IAW the most current edition of Standard Methods for the Examination of Water and Wastewater, O&M manuals, and manufacturer’s specifications.

Operational Tours . At the Government’s request, the Contractor shall perform operational tours to evaluate plant operation and lift stations.

WASTEWATER TREATMENT PLANT (WWTP)

Scope

Wastewater Collection System . The Contractor shall ensure the Wastewater Collection System is uninterrupted, reliable, continuous, and cost effective in the delivery of all generated wastewater leading from and throughout all buildings and structures, to the final outlet. The Contractor shall perform services that include inspection and maintenance of all Wastewater Collection System components.

Sewage Collection and Reclaimed Water Distribution System . The Contractor shall repair, replace, install, and maintain the sewage collection system including pipe and manholes, appurtenant structures, and building sewers to points of connection with the building drains.

The sewage collection system includes 712,108 linear feet of piping, 950 main sewer manholes, fifty (50) septic tanks, twenty-four (24) lift stations, and twenty-eight (28) oil/water separators.

The sewer collection system pipe and fittings range in size from two (2) inches to twenty-four (24) inches in diameter. Pipe and fitting materials include vitreous clay, asbestos cement, plastic (abs), PVC (polyvinylchloride), bituminous fiber, and cast-iron pipe. Tanks and containers range in capacity from twenty-five (25) gallons to 2,000 gallons.

The Contractor shall clear all sewer lines of debris, roots, sand, and other blockages. The Contractor shall repair all sewer line breaks, line sags, and lines invaded by roots, to include manholes, clean outs, and appurtenances leading to main or service lines, shall replace unrepairable components, and shall reroute and install lines, clean outs, and manholes, as required, on receipt of a valid work document and IAW Uniform Plumbing Code, current edition Wastewater Systems, Chapter 7.

The Contractor shall coordinate with the COR/ACOR to obtain the approval of the Government forester before removing any tree, bush, or any type of decorative vegetation that needs to be removed to facilitate access to an underground sewer line or to remedy a problem related to roots.

The Contractor shall, after rodding or cleaning sewer lines, remove all wastes and debris that surrounds the manhole or clean-out area. After debris has been cleaned and removed, the Contractor shall spray the area contaminated with raw sewage with a ten (10) percent solution of water and liquid household type chlorine (Hypochlorite) to sanitize.

The Contractor shall repair septic tanks, cesspools, grease traps, and holding tanks. Components include tanks, basins, piping, fittings, leach lines, and other associated equipment and materials. The Contractor shall pump out contents of septic tanks, when required, transport and dump waste in any existing collection system manhole that is located no less than two miles from the WWTP.

Reclaimed Water Distribution System . The Contractor shall perform all work to preclude cross connections and contamination with the existing potable water distribution system. The Contractor shall follow all federal, state, and local applicable regulations and in the event a cross connection occurs, the Contractor shall secure and treat the contaminated area IAW American Water Works Association (AWWA)-C-651-92 – Standards of Disinfecting Water Mains.

The Contractor shall follow all applicable safety procedures when performing work in the reclaimed water.

The reclaimed water distribution system includes 48,000 linear feet of piping, eleven (11) pumps, and ninety-four (94) valves.

The reclaimed water distribution system pipe and fittings range in size from two (2) inches to twelve (12) inches in diameter. Pipe and fitting made of various materials to include polyethylene pipe (PE), asbestos-cement, PVC, etc.

Wastewater Plant Operations . The Contractor shall operate and perform operations and operator's maintenance checks on the WWTP and the reclaimed water irrigation pumping system listed in TE 27 – Water and Wastewater IAW all applicable federal, state, and local codes, 40 CFR – Protection of the Environment, and the Operation and Maintenance Manual for Wastewater Treatment Plant Ft. Huachuca, AZ.

The Contractor shall use the Operation and Maintenance Manual for the Wastewater Treatment Plant Ft. Huachuca, AZ as a guide to operate and maintain the fort’s wastewater treatment and the reclaimed water irrigation system.

The Contractor shall perform operations and operator's maintenance checks twenty-four (24) hours per day, seven (7) days per week. Operations personnel shall only perform operations and hourly, daily, and weekly operational checks listed in TE 27 – Water and Wastewater and all other requirements listed in this PWS. The Contractor shall have two (2) operators performing operations during the normal eight (8)-hour workday. Operations personnel will not perform recurring maintenance or perform work on service orders. The Contractor shall check the operations of all effluent and sewage lift stations located on Fort Huachuca once per eight (8)-hour shift. To prevent contamination of the Fort Huachuca potable water supply, the Contractor shall use personnel to operate the water production systems independent of personnel used to operate wastewater treatment systems during the same shift. Similarly, the Contractor shall not utilize clothing, tools, and equipment on the water production systems that has been used on the wastewater treatment systems.

The Contractor shall maintain quality of treated effluent IAW AR 200-1 – Environmental Protection and Enhancement, Arizona Department of Environmental Quality, and the Operation and Maintenance Manual for the Wastewater Treatment Plant Ft. Huachuca, AZ.

The Contractor shall use bound ledger type logbooks and recurring maintenance checklists. The Contractor shall enter in each logbook any information that is related to operation, and all abnormalities encountered during operation, the action taken, and any remarks concerning standard or required procedures. The Contractor shall enter the date and time of the entry and the name of the person making the entry. The Contractor shall have the logbook at Building 90722 (WWTP #2).

The Contractor shall remove periodically or as needed the dried sludge after laboratory analysis confirm contaminant levels are below established parameters. The Contractor shall stockpile the dry sludge that has been confirmed safe to be used as fertilizer. The dry sludge that is confirmed not safe, shall be removed to the local landfill. The Contractor shall only remove sludge that is thoroughly dried.

The Contractor shall collect sewage samples to monitor the performance of the treatment process and analyze results and compare to the required parameters to comply with the applicable regulations. The Contractor shall follow federal, state, and local requirements for wastewater sampling and analyses.

The Contractor shall collect samples from the golf course irrigation system and from Chaffee field surge tank as required in TE 27 – Water and Wastewater to determine the fecal coli form count. The sample shall be collected in 100-ml bottles or bags containing sodium thiosulfate to neutralize the chlorine residual. The sample shall be labeled with date, time of collection, location, and initials of the operator collecting the sample. Sample shall be stored in a refrigerator until time of analysis IAW all applicable regulations.

The Contractor shall perform grab samples to determine the chlorine residual of the golf course irrigation system and Chaffee field surge tank and record results in the logbook in addition to other information. This is needed to verify if chlorination results are in accordance with the applicable regulations.

The Contractor shall record meter readings every twenty-four (24) hours, for all meters that produce a recording such as electric meters, water meters, totalizer meter, reclaimed water meters for the golf course and the Chaffee Field systems. A report of the previous month's meter recordings shall be furnished to the COR/ACOR by close of business on the fifth (5th) business day of each month. Refer to TE 28 – Water/Gas Meters for a post wide list of water/gas meters to be read monthly. The Contractor shall include in the report the consumption of all chemicals used to treat the influent.

Lift Stations . There are approximately thirty-three (33) lift stations located throughout the post. The Contractor shall have the operators check all lift stations that are listed in TE 27 – Water and Wastewater for proper operations at eight (8)-hour intervals.

Equalization Basins . Due to the variation in flow and the large amounts of suspended solids in the wastewater, equalization basins are provided at the treatment plant site for mixing, flow equalization, storm water storage, and fats, oils, and grease removal.

Chemical Gaseous Storage . The Contractor shall store no more than 2,400 pounds of the same type of gas in any facility. The Contractor shall keep records on bottle changes, dates, facility number, amounts in store and used, etc. These records shall be available to the Government upon request.

Components . WWTP equipment and components include but are not limited to mechanical bar screens and grit collection system, augurs, recirculating systems, chemical storage and pumping systems, channel, and gate bypass systems, pumping and distribution systems, electrical and digital control systems, alarm systems, valves, piping and fittings, controllers, and regulators. The WWTP is subject to compliance inspections at any time without prior notification. WWTP operations include, but are not limited to, checking, evaluating, adjusting, and maintaining operating pressures, levels, pump rates, temperatures, and process efficiencies based on environmental and fluctuating load conditions.

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