PWS-2June2015_KKC_notes_6_16_15_(3).docx

Performance Work Statement (PWS)

Superfund Site 10th Street Remedial Action – Phase II Columbus, NE

I. SITE BACKGROUND PRIOR TO 2012

The 10th Street site consists of two operable units (OU). The actions associated with OU1 consisted of groundwater monitoring with institutional controls (IC) with a contingency for extraction and discharge to the Loup River if the groundwater monitoring results indicated unacceptable risks. At the time of the OU1 Record of Decision (ROD), dated February 1995, the source of the contamination was thought to be two small dry cleaners in the vicinity of the municipal well field.

Groundwater monitoring conducted after issuance of the OU1 ROD detected elevated concentrations of tetrachloroethylene (PCE) and trichloroethylene (TCE) in a monitoring well that had previously been considered a background well for the site. A subsequent investigation conducted in the fall of 1998 indicated a major source of PCE and TCE groundwater contamination emanating from a One Hour Martinizing (OHM) dry cleaning facility over one-half mile upgradient from the original area of contamination. The newly identified source resulted in the designation of OU2.

An Interim Action ROD for OU2 was signed in September 2001 to address the impending threat of the contaminated groundwater plume to the municipal water supply well field. The remedy consisted of an air sparging/soil vapor extraction (AS/SVE) system to address the OHM source area; a groundwater extraction and treatment (GET) system to control plume migration and protect the city municipal well field; and ICs to prevent exposure to the contaminants.

A final OU2 ROD was signed in September 2005 to finalize the site-wide remedy. It called for continuing source area treatment with AS/SVE, continuing plume control with the GET system, added in-situ chemical oxidation to reduce volatile organic compound mass upgradient of the GET system, and limited action (ICs) for the contaminated soils at the three source area properties.

The assessment in the 2010 Five-year Review (FYR) found the remedy was constructed in accordance with the requirements of the RODs. However, it was determined that the remedy, as it currently operates will not be capable of fully meeting the remedial goals. As a result of the 2010 FYR, an amendment to the September 2005 OU2 ROD was signed in December 2012.

The main focus and purpose of the amended remedy is to address soil and groundwater contamination in the three source areas, address groundwater at the former Jackson Services, and Liberty Cleaners source areas, and long-term response actions for the vapor mitigation systems that were installed in 2012, pursuant to a time-critical removal action (TCRA).

II. Current Site Location and Description of Remedial Action - Phase II

The 10th Street Superfund Site (Site) is assigned Comprehensive Environmental Response, Compensation, and Liability Information System (CERCLIS) identification number NED981713837 and is located in Columbus, Platte County, in east-central Nebraska. The Site is located in the south central portion of the City of Columbus in Platte County, Nebraska and is composed of two operable units (OUs).

OU1 includes an area generally south of the Union Pacific (UP) rail line that crosses the central portion of the city and includes the southern municipal well field where contamination was originally identified and the former Jackson Services and Liberty Cleaners source areas. OU2 includes the area north of the UP rail line to the former One Hour Martinizing (OHM) dry cleaning facility, now Prestige Dry Cleaning, located over ½ mile north of OU1. Although OHM became Prestige Dry Cleaning in 2009, it will be referred to as OHM for consistency with previous documents.

The amended remedy as described in the 2012 Amendment to the Record of Decision (ROD) (EPA 2012) is intended to be the final response action to address all contamination associated with the principal threats posed by the three source areas. The three source areas are the former OHM, located at 2262 25th Avenue; the former Jackson Services, located at 960 24th Avenue; and the former Liberty Cleaners, located at 1061 25th Avenue.

Specifically, the amended remedy addresses the source contamination in the unsaturated soils and residual groundwater contamination located at the source areas. The amended remedy for the source area soils is building demolition, excavation of contaminated soil and off-site disposal at all three source areas including demolition of the former warehouse at 1059 25th Avenue, which is adjacent to the former Liberty Cleaners. The alternatives will include placement of a chemical oxidant in the excavation prior to backfilling.

The amended remedy will permanently and significantly reduce the toxicity, mobility and volume of Site contaminants of concern (COCs) through above mentioned actions as well as in situ chemical oxidant (ISCO) and/or biological remediation of residual groundwater.

BASIS OF DESIGN

As described in the amended remedy, this remedial action includes the following elements:

-Building demolition, excavation and off-site disposal of contaminated soil at all three source areas.

-A chemical oxidant will be placed in the excavation prior to backfilling to address residual contaminants of concerns (COCs) in the vadose zone/capillary fringe.

-ISCO application to address contaminated direct-push technology (DPT) at all three source areas.

I. Contaminants

Tetrachloroethylene (PCE), which was used in the dry cleaning process, is the primary contaminant of concern (COC). The VOC contaminant plume consists of PCE, as well as trichloroethylene (TCE) and cis-1,2-dichloroethylene (cis-1,2-DCE) which are breakdown products of PCE. The plume figures in Attachment A show the shallow plume for PCE, TCE, and cis-1,2-DCE based on concentrations of these contaminants above the Maximum Contaminant Level (MCL). The shallow aquifer is historically where groundwater contamination has been most widespread.

II. General Conditions

The Contractor may work Monday through Friday 0700 to 1700 hours. The exception is for the Arby’s work effort, the Contractor may work every day 0700 to 1700 hours. The Contractor may be able to perform some activities during the evening for the Arby’s effort, but will have to request permission from COR; submit a Night Operations Plan and receive approval from the COR and the City of Columbus; and shall abide by the City of Columbus noise ordinance plan. Contractor may not work on Federal holidays. The Contractor is expected to clean-up the worksite at the end of the working day, including picking up trash. Contractor shall keep the city streets clear of mud, dirt, and other related construction debris. The Government will not be responsible for any loss or damage to the property of the Contractor.

III. Tasks

The contractor is required to provide all specified services, including all management, supervision, labor, equipment, tools, materials, supplies, services and any other costs incidental to performance of the tasks included herein. The tasks mentioned are not all inclusive of the contract, but they do represent the major features of work for this contract.

TASK 1 – COMPLIANCE REQUIREMENTS AND COSTS

The contractor shall procure all permits, licenses, utility clearances, and certificates that may be required by law as well as comply with all federal, state, and local laws, ordinances, rules, and regulations applicable to the performance of this PWS and contract plans & specifications.

All plans and reports shall be in compliance with applicable federal regulations.

Costs incidental to performance that contractor is required to pay will include lost business payments to Arby’s of $2500 per calendar day beginning on day 16, only in the event Arby’s drive through is closed for more than 15 calendar days (regardless of weather), unless the delay is caused by Arby’s or Arby’s contractor(s). The Government will not reimburse contractor for this expense.

TASK 2 – MOBILIZATION AND DEMOBILIZATION

Contractor shall mobilize to site within 30 days of approval of the Site Management Plan and Health and Safety Plan and provide sufficient personnel and field equipment to meet schedule requirements.

Contractor on-site personnel shall attend a safety briefing led by either the project manager or field site manager each day prior to beginning field work.

Contractor shall provide for logistics and establish equipment and materials lay-down and storage areas and support facilities.

Efforts include mobilization and demobilization of all necessary equipment to perform the work as outlined in the PWS and contract plans and specifications.

Power is not available at the site for use by the contractor. The contractor shall be responsible for acquiring necessary power where required.

Potable water is not available at the site for use by the contractor. The contractor shall provide a means of obtaining potable water from a source approved by the EPA COR and storing it, as needed.

Restroom facilities are not available at the site for use by the contractor.

TASK 3 – BUILDING DEMOLITION

The contractor shall demolish 4 separate buildings: Prestige cleaners, Jackson Services, Liberty Cleaners, and the old Ron’s Furniture building adjacent to Liberty cleaners in accordance with contract plans and specifications.

Contractor shall disconnect and abandon utilities in accordance with specification section 02 41 19. Water mains shall remain in service and be protected. Sanitary and storm sewer mains may remain in service or be by-passed.

Contractor shall demolish and remove buildings and foundations in accordance with specification section 02 41 19. Dispose of demolition debris in accordance with section 02 81 00. Contractor shall recycle building materials to the maximum extent practicable (i.e. metal walls, metal I-beams, bricks, etc).

Contractor shall protect wells to remain, per Table 4, sheet G-02.

AS/SVE building demolition: Contractor shall remove and salvage AS/SVE equipment per section 02 41 19. Contractor shall transport salvaged equipment to NDEQ’s Van Dorn facility in Lincoln, NE.

TASK 4– EXCAVATION

Contractor shall perform excavation in accordance with contract plans and specifications.

Contractor shall not excavate into or under Highway 30, along Prestige/OHM and Arby’s.

Contractor shall install the appropriate erosion and sediment control in accordance with section 31 25 00 prior to excavation activities. Erosion and sediment control shall be maintained until site restoration.

Initial excavation limits are maximum allowable without approval from the COR.

Contractor shall excavate to below 3 feet of the water table. Dewater material excavated below the water table in accordance with section 31 23 19.

Contractor shall coordinate brush and tree removal with COR. Typically, all trees with a diameter of 5” or larger will require COR approval prior to removal.

Contractor shall schedule and perform excavation work in Arby’s vicinity to coincide with Arby’s two-week shut-down (currently planned for approximately October of 2015, but this schedule may change). Contractor has 15 days to complete the Arby’s area effort.

Contractor shall provide temporary shoring per section 31 50 00. Shoring plan must be reviewed and approved by professional engineer prior to submitting to Government for approval.

TASK 5- DISPOSAL OF CONTAMINATED SOILS

Contractor shall perform confirmatory sampling per section 02 61 13 and as approved in Contractor’s approved sampling and analysis plan.

The highest concentration of contamination is anticipated to be Excavation Area B on Sheet C-04, in the vicinity of the old OHM/Prestige cleaners and Arby’s. All other excavation locations are anticipated not to be Hazardous waste and thus hauled to local landfill as non-hazardous, special waste.

Contractor shall excavate soil to the limit shown on the Contract drawings and as necessary to achieve the required clean-up levels in Table 02 61 13-1 and as directed by the COR.

Table 02 61 13-1 Cleanup Levels for Soil

Transport & Disposal of contaminated soil: Contractor shall not be permitted to transport materials off-site until all disposal facility documentation has been received, reviewed, and accepted by COR in accordance with section 02 81 00. Use only the haul routes as approved by COR. All hazardous waste must be hauled to Kimberly Nebraska. Non-Hazardous, special waste may be disposed in the local landfill.

TASK 6– CHEMICAL OXIDANT & BACKFILLING

Prior to backfilling any excavation, Contractor shall ensure, via sampling, that the cleanup levels for soil have been achieve per Table 02 61 13-1.

Contractor shall apply chemical oxidant to bottom of excavations prior to backfilling. The chemical oxidant shall be potassium permanganate (KMnO4), sodium permanganate (NaMnO4) (Carus Cemical REmoOx L) or an approved equivalent product.

Per specification 02 52 20, paragraph 3.3.1, Contractor shall mix the chemical oxidant to the volume and percentage solution referenced in Table 02 52 20-1 & Table 02 52 20-2.

Contractor shall supply clean backfill and meet the requirements of 31 23 23. Borrow area location to be selected by Contractor and approved by COR.

Contractor shall backfill and compact per section 31 23 23 – Earthwork. Backfill shall be placed in lifts not exceeding 8 inches. Each layer of backfill shall be compacted to at least 95 percent maximum dry density determined by ASTM D698.

TASK 7– SITE RESTORATION

Site restoration shall start only after excavation and backfill activities are completed as specified in section 02 61 13 and section 31 23 23.

The Contractor shall maintain all erosion and sedimentation controls previously installed as specified in section 31 25 00 during restoration activities.

Seeding shall be as specified in accordance with section 32 92 19.

Restoration around trees to be left in place, per COR approval, and per Table 2, exclusion Radii on sheet G-02. All trees greater than 5” diameter will require COR approval to remove.

TASK 8– MONITORING WELL

Contractor shall install a total of 20 monitoring wells.

Contractor shall install monitoring wells in accordance with section 33 29 10 and Sheet D-01. All monitoring wells shall have schedule 40 PVC for screen material and slot size of 0.02 inches.

TASK 9 – INSITU CHEMICAL INJECTIONS

The Contractor shall conduct one round of DPT chemical oxidant injections at the three source areas as shown on the contract plans: sheet C-08 for OHM, sheet C-14 Jackson Services, and sheet C-20 Liberty Cleaners.

Contractor shall perform DPT injections into Highway 30 and shall have adequate traffic control in place and approved by COR and City of Columbus.

Contractor shall perform DPT injections per Table 02 52 20-3 & Table 02 52 20-4.

Upon completion of each injection, the contractor shall seal each borehole with bentonite-cement slurry in accordance with NAC Title 178 and per section 02 52 20, paragraph 3.4.9.

Contractor shall restore disturbed areas in accordance with contract specifications.

Contractor shall perform groundwater monitoring at all 3 source areas 3 months and 6 months after the DPT injection event, per section 02 52 20, paragraph 1.1.3. Additional DPT injections may be authorized by EPA.

IV. SCHEDULE

The Contract duration is 270 calendar days from the time of contract award. The sequence of work is not specified by the Government with the exception of the Arby’s work effort. Currently, Arby’s will be performing an interior and exterior renovation and is shutting down business for 2 weeks both interior (dining room) and exterior (drive-through). This effort is anticipated to be in the first 2 weeks of October but that schedule may be modified by Arby’s. The EPA contractor is expected to coordinate with the Arby’s architect and parallel the Arby’s work portion to coincide with the Arby’s planned 2 week shut down.

V. CONTRACT DELIVERABLES

Contract Deliverables are all specified in the Submittal Register, located within the contract Specifications, the end of 01 330 00 section. The Submittal Register is also attached to the PWS.

Contractor shall submit approved Project Management Plan to Government, including Government comment’s within 30 days of Contract Award and prior to field work on site in Columbus, NE.

VI. PERSONNEL QUALIFICATIONS KEY PERSONNEL REQUIREMENTS

KEY PERSONNEL 1: PROJECT MANAGER

The Project Manager (PM) shall be the onsite contractor point of contact with the EPA Remedial Project Manager/Contracting Officer Representative (RPM/COR), and shall be responsible for the management and execution of all response actions. The PM does not have to be on site while work is progressing in the field.

The PM shall demonstrate the following minimum qualifications and experience:

Project Manager with a B.S. Degree or above

1) B.S. degree or above

2) A minimum of three (3) years (in the past five (5) years) of on-site field experience in the following:

a. any combination of earthmoving, demolition, and environmental hazardous/contaminated waste, but must have experience in all 3 areas to qualify as the PM.

b. OSHA 10-hour Construction Outreach training

c. 40 hour OSHA HAZWOPER training and be up to date on HAZWOPER 8 hour annual refreshers.

OR

Project Manager without a B.S. Degree

2) A minimum of five (5) years (in the past ten (10) years) of on-site field experience the following:

a. any combination of earthmoving, demolition, and environmental hazardous/contaminated waste, but must have experience in all 3 areas to qualify as the PM.

b. OSHA 10-hour Construction Outreach training

c. 40 hour OSHA HAZWOPER training and be up to date on HAZWOPER 8 hour annual refreshers.

KEY PERSONNEL 2: SITE SUPERINTENDENT

The Site Superintendent (SS) directs and oversees work activities at the direction of the PM and is required to be on-site throughout the project while work is occurring.

The SS shall demonstrate the following minimum qualifications and experience:

· At least 5 combined years of direct experience as a Superintendent in a combination of the following features: earth moving, demolition, and managing and supervising hazardous cleanup personnel. The Site Superintendent must have experience in multiple areas to qualify for the position. Years’ experience can occur concurrently.

· OSHA 10-hour Construction Outreach training.

· 40 hour OSHA HAZWOPER training and be up to date on HAZWOPER 8 hour annual refreshers

NON-KEY PERSONNEL REQUIREMENTS

All on site contractor personnel shall have completed Hazwopper training and/or be current with refresher course requirements.

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