Amendment W912WJ23Q0020-0003.pdf

W13G86231965050001

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

Amendment 0003 is to update the Statement of Work (SOW), upload individual draw ing sheets #2-#6 in larger format, and answ er three (3) questions from industry.

The closing due date remains January 18, 2023 at 5:00 pm.

All other terms and conditions remain unchanged.

1. CONTRACT ID CODE PAGE OF PAGES

1 14

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY 11-Jan-2023

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street , County, State and Zip Code) X W912WJ23Q0020

X 9B. DATED (SEE ITEM 11)

20-Dec-2022

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

11-Jan-2023

CODE

U S ARMY ENGR DISTRICT, NEW ENGLAND

696 VIRGINIA RD

CONCORD MA 01742-2751

W912WJ 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

Sheila.M.Winston@usace.army.milEMAIL:978-318-8159TEL:

SHEILA M WINSTONVINCUILLA / CHIEF, CONTRACTING DIVISION

W912WJ23Q0020

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION SF 30 - BLOCK 14 CONTINUATION PAGE

The following have been added by full text:

QUESTIONS AND ANSWERS

Question 1: We’re seeking clarification pertaining to the 2500 gallon septic tank. Looks like the written spec is calling for a monolithic structure, whereas the detail shows a two-part system. We are finding unilaterally from precast companies that it not feasible to produce due to the nature of the interior baffle wall. Can we go with the two piece structure as detailed?

Answer 1: A monolithic structure for the septic tank is not required. Provide a 2,500-gallon septic tank precast reinforced concrete two compartment structure in accordance with all other requirements in the statement of work.

Question 2: There are 3 trees in the vicinity of the leach field. May these trees be removed in order to maintain a safe excavation of the leach field?

Answer 2: Tree removal is permissible, however, the work is not required as per the Statement of Work. If tree removal is to occur, all work is still required to be in compliance with EM 385-1-1. Trees that are removed shall have their stump and root ball system removed or ground to 1’ below finish grade.

Question 3: Can you advise me of any possible penalty / L.D.’s associated with the referenced project after the 210 day contract duration?

Answer 3: Although LDs (liquidated damages) are not included, requests for extension in time will be evaluated and if necessary consideration (in the form of a reduction in price) will be requested in exchange for the extension.

SECTION C - DESCRIPTIONS AND SPECIFICATIONS

The following have been added by full text:

REVISED STATEMENT OF WORK

REPLACE SEPTIC SYSTEM

CAPE COD CANAL PROJECT

U.S. ARMY CORPS OF ENGINEERS

STATEMENT OF WORK

SANDWICH, MA

NOVEMBER 2022

I. General

1. Scope of work

Furnish all labor, equipment, and materials to replace the existing septic system for a public bathroom facility located on federal property at the Cape Cod Canal Project in Sandwich, MA. Work includes excavation and removal of the existing septic system that includes a septic tank, cast iron piping, distribution box, leach field with perforated pipe in trenches, and proper handling and disposal of approximately 725 cubic yards of leach field remediation waste (contaminated crush stone/soil). The replacement septic system shall match the dimensions and elevations of the existing system and be installed within the same footprint.

The new septic system shall include a 2,500-gallon precast concrete dual compartment septic tank, 4” PVC piping, concrete distribution box, leaching chambers, new leach field stone/sand, and other related items (to include, but not limited to repairing disturbed lawn, pavement, and curb areas back to original condition). All work shall be performed by a Massachusetts licensed septic system installer.

Work includes excavation within a park area that requires temporary fencing and restoring all disturbed areas to pre-existing conditions. Work includes trenching across existing paved areas that shall be patched. Contractor shall furnish all labor, equipment, materials, services, and tools necessary to replace and provide a fully functional septic system (See figures 1-10 and Photos 1-8). Attached drawings from 1976, sheets 2-6, show the as-built conditions of the existing septic system.

2. Locations

Sandwich Recreation Area is located at the end of 12 Freezer Road in Sandwich, MA 02563.

The work area is shown on Figures 1-4. There are Government maintained portable toilets located at the site that can be utilized by the contractor during field work. The public roads and parking areas are heavily used by the public. Work includes fencing, signage, barricades, and traffic control devices necessary to protect the general public from hazards within the work area.

3. Site Visits The project area is open to the public at any time. Interested vendors can inspect the existing conditions of the work area at any time. No extra payment will be allowed for perceived additional work caused by unfamiliarity with site conditions and requirements. A scheduled site visit will be provided for all interested vendors, with a date and time to be determined.

Contact the Technical Point of Contact to confirm attendance for site visit. The Technical Point of Contact (TPOC) for the project is Travis Germano (978) 318-8550 or (Travis.J.Germano@usace.army.mil).

4. Schedule

The work shall be completed within 210 days from notice to proceed. The project area will be open to the contractor Monday through Friday, with work hours form 0700-1800. All work must be completed within the period of performance established by the Contract. No work shall be done on weekends or Government holidays.

5. Safety Requirements

a. General: All work shall be conducted in accordance with the U.S. Army Corps of Engineers (USACE) Safety and Health Requirements Manual (EM 385-1-1, most recent edition), and all applicable Occupational Safety and Health Administration (OSHA), federal, state, and local safety and health requirements. Perform work in a safe manner that protects both workers and the general public from hazards. All equipment shall be in good working order with all safety features as recommended by the manufacturer. A copy of EM 385-1-1 can be accessed at the project office or electronically at the following link:

https://www.publications.usace.army.mil/Portals/76/Publications/EngineerManuals/EM_ 385-1-1.pdf

Project staff reserve the right to cease work at any time should the safety of employees, Contractors, and/or the public become jeopardized.

b. Accident Prevention Plan: The contractor shall prepare an Accident Prevention Plan

(APP) specific to the activities being performed, at a minimum it must meet the requirements of EM 385-1-1, Appendix A. It shall include Activity Hazard Analyses (AHAs) as described below.

A preparatory meeting shall be conducted by the Prime Contractor to discuss the APP contents with all effected onsite employees. The Prime Contractor is responsible for informing the subcontractors of the safety provisions under the terms of the contract, the penalties for noncompliance, and inspecting subcontractor operations to ensure that accident prevention responsibilities are being carried out. Weekly safety meetings shall be held and documented. Records shall be available to the Technical Point of Contact upon request.

c. Activity Hazard Analysis: An AHA shall be submitted for each major phase of work. A major phase of work is defined as an operation involving a type of work presenting hazards not experienced in previous operations or where a new subcontractor or work crew is to perform the work. The analysis shall define all activities to be performed, identify the sequence of work, the specific hazards anticipated, and the control measures to be implemented to eliminate or reduce each hazard to an acceptable level. The AHA shall be continuously reviewed and revised to address changing site conditions as appropriate.

d. Required Personnel: The contractor shall employ a minimum of one Competent Person (CP) at each project site to function as the Site Safety and Health Officer (SSHO). The SSHO shall be onsite at all times during construction. The SSHO is required to have related construction experience and have at a minimum completed a 10 Hour OSHA training.

e. Accident Reporting: All accidents and near misses shall be investigated by the contractor and reported to the Technical Point of Contact immediately.

f. Daily Reports: The contractor shall provide daily production and QC reports, employee work hours, and certified payrolls electronically to the Technical Point of Contact.

g. COVID-19 Precautions: As part of the APP and AHAs include site specific COVID-19 monitoring procedures which address, at a minimum, recommended protocols, and mandates in accordance with Centers for Disease Control and Prevention (CDC) guidelines. Employee training on the signs, symptoms, and protection measures in accordance with CDC guidelines.

6. Preconstruction Conference

Prior to the start of any work, the contractor and Technical Point of Contact will schedule and conduct a “Preconstruction Conference”. The contractor’s staff responsible for quality and safety on the job site will attend this meeting. No work may be performed under this contract prior to this conference. The purpose of the conference is to enable the Technical Point of Contact to outline the requirements in terms of safety, quality, communications, inspections, material storage, submittals, and payments.

7. Permits

The work site is located on federal property, therefore USACE is responsible for permit requirements with local Board of Health and MassDEP. The contractor shall, without additional expense to the Government, be responsible for obtaining Septic Disposal Installers License and Septage Hauler Permit. The contractor shall comply with any applicable federal, state, county, and municipal laws, codes, and regulations in connection with the performance of the work specified under this contract.

8. Security

The contractor will comply with all established security policies at Cape Cod Canal Field Office. Potential periods of heightened security may affect access to work areas. During periods of heightened security, the Government reserves the right, at any time, to close any property and reschedule work. The contractor shall be given at least 24-hour notice of any such closure.

9. Contractor Conduct

The work area is located on federal property on a service road open to the public for recreation activities. Contractor and employees must act in a safe and professional manner at all times. Alcohol and firearms are prohibited on project grounds.

10. Payment

Payment shall be made after final inspection and acceptance by the Government, the contractor must submit an invoice, utilizing Form ENG 93, to the Technical Point of Contact.

The invoice shall include the name of contractor (as per SAM registration), invoice date, contract number, description of work completed, and total amount due. For jobs greater than 30 days the contractor may request progress payments. Invoices may be mailed to:

US Army Corps of Engineers Cape Cod Canal Field Office P.O. Box 1555, Buzzards Bay, MA 02532 Attn: Travis Germano or email to travis.j.germano@usace.army.mil

II. Technical Requirements:

Part 1 General:

Contractor’s work includes all personnel, equipment, materials, supervision, and services necessary to replace the existing septic system as described herein. The new septic system shall be constructed to match the form, dimensions, grades, and functionality of the existing septic system. The system shall be installed by a licensed septic installer.

Requests for Information:

After Contract award, requests concerning the work of this project should be directed to the Technical Point of Contact at the Cape Cod Canal Office at (978) 318-8550 or travis.j.germano@usace.army.mil.

Submittals:

Contractor shall provide submittals that show pertinent details of proposed materials that allows confirmation the materials are in accordance with requirements listed in the materials section of this scope of work. Although the Government technically reviews submittals, the contractor’s work must be prosecuted using proper internal controls and review procedures. Contractor submittals must be reviewed and accepted by the government prior to the commencement of any field activities. Contractor shall provide required submittals to the Technical Point of Contact within 45 days of notice to proceed.

Required submittals include:

1. Accident Prevention Plan and Activity Hazard Analyses for all fieldwork.

2. Schedule

3. Work Plan and Traffic Control Plan – Provide a site plan with description of planned access points, storage of materials, and haul routes for trucks and equipment. Include description of signage, barriers, flashing barricade lights, traffic control devices and flaggers to protect the general public from hazards. Include the means and methods to control pedestrian, bike, and vehicular travel within the work areas.

4. Dewatering Work Plan

5. Septic Disposal Installers License and Septage Hauler Permit.

6. For all materials to be used on the project, the contractor shall provide the following information:

(1) Manufacturer’s name

(2) Catalog number

(3) Specifications

(4) Sieve analysis for all aggregates.

(4) Any other information necessary to approve the materials

(5) Safety Data Sheets (SDS) shall be submitted along with the product data for any potentially hazardous materials such as adhesives and flux materials.

7. Septic System Preliminary Drawing and As-Builts

Government Resources:

The contractor is responsible for providing all resources to complete the project. The Government will not provide any equipment or services.

Omissions:

This scope of work may not cover all specified activities, steps, and procedures required to supply the contract product. In case of omission, the normal industry, state, or federal standards, practices, specifications, and/or guides shall prevail. In no instance shall an omission be reason to produce less than an acceptable product.

Quality Control and Quality Assurance:

The contractor is responsible for the quality control of all work. The Government has the right to inspect and test all items called for by the contract, to the extent practicable at all times during the term of the contract.

Other Contracts:

The Government may undertake or award other contracts for additional work not related to this contract, the contractor shall fully cooperate with other contractors and Government employees.

The contractor shall not commit or permit any act, which will interfere with the performance of work by another contractor, or by Government employees.

Storage and Equipment Staging Areas:

Storage and equipment staging areas shall be coordinated with TPOC. The limits of the temporary work area are shown on Figure 3. Contractor is responsible to manage all storage of materials, dumpsters, and staging inside this work area. The contractor is responsible for receiving, unloading and movement of all materials. The contractor shall ensure that stored materials do not migrate into the waterway or onto roadways. Any materials that migrate into the waterway, roadways, sidewalks, bike paths, or recreation areas shall be cleaned up by the contractor daily. The Government is not responsible for damage or theft of contractor equipment or materials.

Clean Up:

The contractor shall practice good housekeeping to maintain a safe job site. The contractor shall keep the work area, including any storage areas, free from the accumulation of waste materials.

Upon completing work, the contractor shall remove all surplus excavation materials, broken pavement, old pipes, old manholes, tools, equipment, and materials, etc., that are not the property of the government and shall clean up the job site to the satisfaction of the government.

Contractor shall leave the entire site and areas adjacent in a neat and orderly condition.

Contractor shall clean up and properly dispose of debris off-site in accordance with federal, state and local ordinances and regulations

Sustainability:

EPA Designated: Under the Comprehensive Procurement Guidelines (CPG) program, the Environmental Protection Agency (EPA) designates products that are or can be made with recovered materials and recommends practices for buying these products. Any designated product that is being offered or supplied under this contract shall meet the minimum recommended content levels as identified under the CPG program. Visit https://www.epa.gov/smm/comprehensive-procurement-guideline-cpg-program for a complete list of designated products and the associated recommended contents levels. Offerors must be able to demonstrate that each offered products meets minimum content levels upon request.

Part 2 Materials:

1. Septic Tank - The septic tank shall be a 2,500-gallon monolithic precast reinforced concrete two compartment structure with inlet and outlet. The tank shall be watertight with embedded rubber seals and rated for H-20 loading. Inlet and outlet openings shall be provided with boot fittings to ensure watertight pipe installation with 4" PVC SCH 40 baffle tees. Provide an effluent filter on the outlet with minimum 1500 GPD, 1/16” slot size, 120 linear feet filtration, pipe size 4”, with floating ball. All precast/pipe construction joints and fittings shall be made watertight by parging with hydraulic cement. Tank, pipe openings, and risers shall be tested for watertightness. Septic tank shall have two watertight concrete manhole risers with cast iron frame and cover to grade. Septic tank construction and materials shall comply with MassDEP Title 5 regulations.

2. Distribution Box - Precast reinforced concrete distribution box with 5 outlets with embedded seals for 4” PVC pipe. Distribution box shall have one watertight concrete manhole riser with cast iron frame and cover to grade. All precast/pipe construction joints and fittings shall be made watertight by parging with hydraulic cement. Rated for H-20 loading.

3. Risers - Precast concrete manhole watertight riser sections.

4. Concrete – Shall be a minimum 4,000 psi compressive strength at 28 days.

5. Cast Iron Frame and Covers – Cast/Ductile Iron Manhole with “Sanitary” Badging

6. PVC Pipe Material - 4” diameter Schedule 40 PVC pipe with watertight cleaned and cemented joints.

7. Septic Leaching Chambers (5 trenches x 70’) – 12”x24” open-bottom, HDPE infiltration chamber that functions in permeable soils for subsurface leaching of septic effluent. Rated for H-10 loading.

8. Septic Leaching Chambers End Caps (10 Total/2 per trench) - HDPE infiltration chamber end cap. Connect ends with 4” SCH 40 PVC Pipe (Use top ports.)

9. Septic Leaching Chambers Observation Port (5 Total/1 per trench) - 10" round commercial grade irrigation valve box with round overlapping cover shall be a high-density structural foam polyethylene valve box and cover with UV inhibitors to prevent discoloration and cracking; box and cover color shall be green. Provide 4” Schedule 40 PVC Vertical Pipe w/ Screw in Cap connecting into HDPE infiltration chamber.

10. Leach Field Sand – Clean Title 5 PERC Sand. Clean granular sand, free from organic matter and deleterious substances. The contractor shall provide a sieve analysis of the Title 5 PERC Sand utilized for fill to verify that it meets the requirements of MA Sanitary Code 310 CMR

15.255 (3). Title 5 Sand fill shall comply with:

SIEVE SIZE PARTICAL SIZE % THAT MUST PASS SIEVE

#4 4.75 mm 100%

#50 0.30 mm 10% - 100% #100 0.15 mm 0% - 20% #200 0.075 mm 0% - 5%

11. Select Fill - Clean granular sand free from organic matter and any deleterious substances.

Fill shall not contain any material larger than two inches.

12. Stone - No 6 Stone Aggregate.

13. Geotextile Fabric –– Non-woven geotextile made of polypropylene fibers.

14. Hot Mix Asphalt - Bituminous material shall be Massot Class 1 Hot Asphalt Mix (HMA) from a MassDOT approved local asphalt processing plant. Cold applied anionic asphalt emulsion tack coat material must meet ASTM specification D977 for grade RS-1. Reclaimed asphalt pavement (RAP) shall be limited to not exceed 10 percent of the total asphalt content.

15. Pavement Patch Subbase Material - Subbase material shall be densely graded soil or crushed stone material that drains well and is free of organic material, silt, and clay. Material that complies with MASSDOT Standard Specifications – Section 400 Sub-Base, Base Courses.

Subbase materials shall not include recycled pulverized pavement.

16. Topsoil – 3/8” Screened Loan Topsoil shall be from a local source that is clean, and free of weeds, litter, and brush with appropriate organic matter suited for growing grass.

17. Seed Mix – Provide seed mix for shoulder area in accordance with MassDOT Standard Specifications Section M6.03.0.

Part 3 Execution:

1. All onsite work shall be coordinated with the Technical Point of Contact prior to start of mobilization. The work area is located within a public recreation area on federal property at the Cape Cod Canal Project.

2. Contractor shall provide, erect, and maintain all necessary fencing, signs, barriers, flashing barricade lights, and safeguards required for public safety. Work shall be performed in a safe manner that protects both workers and the public from hazards. The work area is used extensively by the public for recreational activities that occur 24 hours per day. At the end of each workday the contractor shall ensure that the work area is left secured from public access.

3. The contractor shall employ ample personnel and sufficient equipment to accomplish the work of this contract in the least amount of time and be sequenced to minimize impacts on the public recreation area. Once excavation starts, contractor shall maintain an active daily presence onsite, prosecuting work continuously, without delay, and shall not demobilize nor vacate the work site until the project is complete. Soil stockpiles shall not remain onsite greater than 60 days.

4. In cases where work is not specifically shown or specified, contract shall include miscellaneous items, appurtenances, devices, and materials obviously necessary for a sound, secure, and complete installation of a new fully functional septic system.

5. All work areas are considered environmentally sensitive. Contractor shall inspect all equipment and materials used to prevent the release of any contaminants to the environment.

Prevent any sediment laden runoff from entering waterbodies, drainage inlets, and drainage areas from the pavement. Sediment controls may include, but are not limited to, entrenched staked straw bales, entrenched sediment (silt) fence, or compost filter socks. Remove all temporary sediment controls during final clean-up and prior to demobilization.

6. Existing Conditions: Contractor shall verify that actual site conditions are consistent with the existing conditions depicted within this statement of work. Discrepancies, omissions, and errors shall be reported to the government prior to the start of construction. Contractor shall be responsible for the protection of all existing structures, equipment, and areas from damage during construction. Any items that are damaged or altered during construction shall be restored to their pre-construction condition at the contractor’s expense and verified as such by the Government TPOC. Any disturbed areas outside of the sites to include the access roads and public roads shall be restored to the minimum of pre-existing conditions.

7. Location of underground utilities shown are approximate only and not all underground utilities may be shown. The contractor shall protect all underground utilities from damage throughout the duration of construction and be fully responsible for any and all damages.

The contractor shall call dig safe at 811 or 1-888-dig-safe not less than 72 hours prior to the start of any excavation for verification of underground utility locations. Contractor shall "Dig Safe" the work area prior to any subsurface work. Physically verify underground utility locations, including utility depth, by hand digging using wood or fiberglass handled tools when any adjacent construction work is expected to come within 3 feet of the underground system. The existing sewer line crosses several existing utilities, such as, but not limited to, underground electric and storm sewer lines. No utilities may be interrupted unless approved by the Government TPOC.

8. No portions of the proposed system are located with 100’ of wetlands.

9. Contractor shall coordinate inspection times with the TPOC 24-Hours in advance of the following inspections:

a. After excavation of all unsuitable material from soil absorption area.

b. Water tightness test for tank, sewer line, and distribution box.

c. Prior to covering/backfilling the constructed system.

d. After system backfill and final grading.

10. A Massachusetts License Professional Land Surveyor - shall field stake the new septic system and shall set a stable temporary benchmark as needed by the contractor. At least 48 hours prior to requesting a final inspection of the constructed system the installer shall prepare and provide the government with a preliminary sketch (by hand or cad) showing the final layout, elevations, pipe lengths, and inverts for the completed septic system. If preliminary sketch is approved, a final inspection by the government will be arranged with the installer within 24 hours of preliminary sketch approval. The system shall not be backfilled without written approval from the government.

11. Within 7 days from the date of the final inspection, the contractor shall submit to the government as-built drawing(s) that has been prepared and stamped by a Massachusetts licensed professional land surveyor The contractor shall also submit to the government the electronic cad files for the as-built drawing(s). The as-built drawing(s) shall show complete horizontal and vertical locations of all system components for the completed septic system, both above and below grade, including rim and invert elevations. The as-built drawing(s) shall also show final grades over the entire system.

12. The leaching area shall be covered within 2 working days following government inspection and approval.

13. Contractor to install magnetic tape above all components of septic system at a depth of 12 inches.

14. Heavy equipment shall not be driven over the leaching system area.

15. If a part of this statement of work is to be altered, the government shall be notified in writing before construction.

16. All existing fill material shall be removed within footprint of the leaching trenches and 10 feet beyond edges of trenches. Use select fill as needed to replace fill material around system.

17. Contractor shall expect to encounter groundwater during excavation due to proximity of the canal. See attached “Form 11 – Soil Suitability Assessment for On-Site Sewage Disposal” report dated October 22, 2021, which indicates ground water table depth at elevation -8’ for test pit location 1 and elevation -11’ at test pit location 2. Contractor shall submit a dewatering work plan to complete the work in the dry.

18. Removal of the existing septic system and excavation - Contractor shall pump dry the existing septic tank and distribution box. Contractor shall remove and dispose of the existing 2,500-gallon concrete septic tank, subsurface cast iron pipe, concrete distribution box, three existing cast iron manholes and risers, leach field of perforated pipe, and leach field soil from the site in accordance with MassDEP Title 5 regulations. The trench required to remove the existing cast iron sewer line crosses a wood guardrail, paved parking lot, and granite stone curbing. The existing sewer line crosses several existing utilities, such as, but not limited to, underground electric and storm sewer lines. If the sewer line goes beneath any utility, contractor shall provide a temporary shoring of utility line prior to excavating. Contractor shall acquire TPOC approval of temporary shoring prior to proceeding. The contractor shall saw cut full depth all edges of the pavement for the trench. The wood railing and granite curbing shall be removed and re-installed to the form, fit and function of the pre-existing conditions after installation of new PVC sewer line. The existing leach field is 70’ long x 30’ wide with five trenches of 4” perforated pipe spaced 6’ apart. The five trenches are approximately 6 feet below the surface elevation. The contractor may use the excavated material above the existing leaching field for backfill to the maximum extent possible.

Contractor shall excavate and dispose of approximately 725 cubic yards of the existing contaminated leaching field crushed stone/soil from elevation -5’ to -11’ for area 80’ long x 40’ wide (10’ wider than existing footprint). The edges of all excavations shall be properly sloped, benched, and/or use a trench box for worker safety. Contractor shall ensure complete removal of the existing contaminated crushed stone/soil in leach field. All stones exceeding 2” in diameter, all loam, or foreign material encountered during excavation are to be removed from the leaching excavation area. Topsoil and general fill material that must be excavated above the system can be staged and reused or replaced with in-kind materials to backfill areas. All excavated waste materials to include the concrete tanks, piping and contaminated stone materials shall be properly handled by a licensed septage hauler and transported to an approved disposal location.

19. Install new septic tank - The new septic system shall be constructed to match the dimensions and elevation of the existing system. The new 2,500-gallon concrete septic tank shall have inlet and outlet pipe invert elevation of 12.50 feet and 12.25 feet respectively.

Tank shall be transit leveled with 6” of compacted crushed stone underneath. Contractor shall verify all invert elevations prior to backfilling. Septic tank shall be watertight with proper installation of butyl resin seals in joints of the tank (See figure 5). Backfill and compact granular fill in 6” lifts around the new installed tank and sewer line. Tie into existing 4” cast iron building sewer line within 2’ of building foundation wall with a watertight 4” cast iron to PVC flexible rubber connection coupling. Between the building and septic tank, install a 4” cleanout to grade with cast iron frame and cover (See figure 10).

20. Install new PVC pipe sewer line - The contractor shall install the new 4” PVC pipe to match the dimensions and elevations of the existing cast iron piping. A trench box shall be used in all trenches greater than 5 feet in depth. All pipes shall be laid on a firm base with all connections and joints mechanically sound and watertight. All piping shall be installed without any internal obstructions. Backfill and compact fill in 6” lifts. Magnetic marking tape shall be installed in the backfill material above the pipe at 12” below grade. The new sewer line pipe from the septic tank to distribution box shall be a minimum 1% slope.

Provide No. 6 crushed stone aggregate backfill around the new PVC pipe (See figure 7). C

21. Install new distribution box - The contractor shall install the new concrete distribution box to match the function and elevation of the existing distribution box. The inlet pipe invert elevation shall be 10.50 feet with five outlet pipes from the box. Box shall be transit leveled with 6” of compacted crushed stone underneath. Contractor shall verify the invert elevation prior to backfilling. Five new PVC outlet pipes shall be installed level from the distribution box to new leach field chambers (See figure 6).

22. Install new cast iron man-holes - Install 4 manholes with precast risers materials and cast-iron frame and covers. Three manhole locations at the septic tank and one at the distribution box. Manhole structures shall be installed complete, so covers are flush with finished grade elevation. Frame shall be set in full mortar bed (See figure 6 and 7).

23. Perform Water Tightness Test – Perform a hydrostatic water tightness test on the septic tank, sewer line, and distribution box.

Hydrostatic Testing Steps

a. Prior to backfill, seal the empty tank.

b. Seal access openings, risers, and inlet and outlet pipes.

c. Fill the empty tank with water to a point 2” below the top of the manhole riser. Let the tank stand for 1 hour. If there is a measurable drop in the water surface elevation, refill the tank and let the tank stand for 1 hour. The tank passes the water-tightness test once the water level is held for 1 hour without any measurable loss.

d. When leakage occurs and the tank can be repaired, the water-tightness test shall be made on the tank after repairs have been completed.

e. Repeat the process for the sewer line and distribution box.

f. The septic tank, sewer line, and distribution box must be inspected and certified as being water-tight by the TPOC.

24. Install new leach field - The contractor shall install the new leach field to match the function and dimensions of the existing 70-foot by 30-foot leach field. The new field shall include five trenches of HDPE Leaching Chambers spaced 6’ apart. Connect leaching chamber cap ends with 4” SCH 40 PVC Pipe. Provide 12” of No. 6 stone from the base to the top of the leaching chambers, wrapped in filter fabric (See figure 8). Provide one chamber observation port per leaching chamber trench (See figure 9). Provide approximately 125 cubic yards of No.6 stone aggregate backfill around the leaching chambers from elevation -5’ to -6’ for area 80’ long x 40’ wide (10’ wider than existing footprint). Provide approximately 600 cubic yards of clean sand for the new leaching field from elevation -6’ to -11’ for area 80’ long x 40’ wide (10’ wider than existing footprint). The contractor shall use the excavated material above the existing leaching field for backfill to the maximum extent possible.

25. Restore disturbed pavement areas – Provide a hot mix asphalt from a local source to patch the trench excavation across the paved parking area. Provide 6” of well compacted gravel base material under all pavement patch areas. A tack coat of liquid bituminous material shall be furnished and applied immediately prior to placement of the pavement. The transition from new asphalt pavement to the existing asphalt pavement shall be smooth. Pavement shall be compacted by rolling to a density of not less than 95% of the maximum density.

Pavement shall be minimum 3” thick after compaction. Hand compact in areas inaccessible to rolling equipment. Any depressions in pavement patches caused by settlement shall be corrected by the contractor at no additional cost to the Government.

26. Restore disturbed areas –All excavation areas shall be backfilled with compaction in layers. Restore areas to pre-existing conditions. Provide 4” of topsoil graded smooth and raked. Apply 5 lbs. of seed mix per 1,000 SF. Finished surface above the leaching area shall be graded to assure water runoff (2% minimum slope).

27. All workmanship shall be of the highest quality, and any excess of spilled sealant shall be removed from the pavement by approved methods and discarded. Any workmanship determined to be below the high standards of the particular craft involved will not be accepted and will be corrected and/or replaced as required by the Owner.

28. Disposal: Local regulations regarding hauling and disposal shall apply. Contractor shall dispose of all debris resulting from the construction work. Contractor shall leave the entire site of the work in a neat and orderly condition. Debris, rubbish, non-hazardous waste, and non-usable material resulting from the work under this contract shall be disposed of by the contractor at his expense off Government property. Segregate and maximize recycling of all waste generated. Debris shall be removed and transported in such a manner that prevents damage to local roads and spillage.

29. Closeout Procedures: Contractor shall coordinate with the TPOC for the following at the completion of the project:

a. A final inspection walkthrough of the project, at which time, the contractor shall demonstrate to the TPOC that the work and system is fully operational and in compliance with the Statement of Work.

b. As-built drawings

c. Complete Final Payment Forms and Certifications.

(End of Summary of Changes)