OVERVIEW SCOPE OF WORK (SOW)

Transcription

1 Site Description The subject property is occupied by the former Parker Service Station, which contained a former Service Garage (now called Former Garage) and Filling Station Store (now called Storage Building) (SMS # ) operated from the 1920 s to The property is located at 1 South Street, within the Village of Middletown Springs (Figures 1 & 2, Attachment 3 CAP CD), in a mixed residential/commercial area of the village. The former Service Garage was located west of the former Storage Building. The former Storage Building is located adjacent to the eastern border of the property (Figure 3, Attachment 3 - CAP CD). The Site encompasses approximately 0.5 ± acres, on the corner of VT Route 133/140 and South Street, within the village. Prior to the construction of the former Storage Building and Service Garage, the site contained a brick house and store constructed in the 1830 s. The house and store were destroyed by fire in the 1920 s. Following the fire, the store s basement was filled with debris, presumably the brick building material and soil fill. After the basement backfilling, a concrete slab was poured over top and the former Filling Station Store (Storage Building) was built on the slab. In 2014, the Storage Buildings stick-built building was removed, leaving the slab in-place. The slab was recently removed and staged onsite allowing for full access to the filled-in basement. An asbestos inspector has confirmed the widespread presence of loose, friable asbestos in the soils in the northern half of the basement. Additionally, chemical contaminants such as poly-chlorinated biphenyls (PCBs) and total petroleum hydrocarbons (TPH) are present in the soils in the northern half of the basement. Disposal sampling for chemical contaminants has been completed and laboratory analysis results are included. The asbestos inspector completed a site walk through with three asbestos abatement contractors. Included in this bid are the names of the three abatement contractors as well as a copy of the asbestos abatement plan. Please select one of the three abatement contractors. The choice of three was done in the interest of time, as the funding has a sunset date. Additionally, the asbestos inspector is requiring six test pits be completed in the southern half of the basement. The inspector will be onsite to observe the soils for signs of asbestos during the test pitting. If it is deemed asbestos contaminated then it can be disposed of at the same facility as the known asbestos contaminated soils in the northern half of the basement. During the test pitting, Ross Environmental Associates, Inc. (R.E.A.) will collect chemical contaminant disposal samples from the soils. The Village would like to salvage the Storage Building s field stone and granite block foundation, if possible after they are properly washed. The Former Garage is located immediately west of the former Storage Building. In 2013, approximately five cubic yards of PCB and PAH contaminated soil was removed from an area formerly containing a hydraulic lift at the Former Garage. The lift extended to approximately six feet below ground surface (bgs). Confirmatory sampling, completed after the contaminant removal, indicated the presence of PCBs on the west sidewall location, as seen on the attached CD containing the 2013 PCB soil removal report completed by Ross Environmental Associates, Inc. (R.E.A.). This RFP requires the removal of additional PCB and PAH contaminated soil from area of the former hydraulic lift with the completion of confirmatory sampling after soil removal. All contaminated soils removed from the excavation will have to be disposed of at a TSCA approved disposal facility, such as Model City in New York, per Kim Tisa, the Regional EPA PCB Coordinator. The excavation should not be backfilled until the confirmatory sampling results indicate the removal of all contaminants, rush sample analysis will be completed by R.E.A.. The project has been presented as two separate phases of work. One phase is associated with the removal, transport, disposal and confirmatory sampling of PCB and PAH contaminated soils from the area of the hydraulic lift at the Former Garage (Item #4) and the second phase consists of the removal, transport and disposal of asbestos contaminated soil and ACM which includes an asbestos contaminated boiler, safe, brake pads and gaskets at the former Storage Building (Item #5). Additional chemical contamination is present in the soil including PCBs below the TSCA Hazardous Designation of 50 ppm and TPH above the VT DEC SSV for industrial soils. CONTRACTOR can submit bids on either or both of

2 the phases. The OWNER will decide on the best fit scenarios based on responses to the Request for Proposal (RFP). Due to the close proximity of the two phases, CONTRACTORS will need to coordinate the work to be completed. All plans and scope of work (SOW) should be completed to the level requested in the approved Leggett, Brashears and Graham, Inc. (LBG) CAP in conjunction with the R.E.A. PCB removal report, which are included on a CD. The CAP requirements take precedent over the requirements included in this RFP, if different. Project Overview The funding for the proposed work is through EPA grants and requires adherence to Federal Law, which includes Davis-Bacon prevailing wages, which must be included in the bid costs. A Phase I Environmental Site Assessment (ESA) for the site was completed by LBG in July The ESA identified evidence of Recognized Environmental Conditions (RECs) at the site. The RECs included: Past use of the service garage and filling station from the 1920 s to 2004, including floor drains, use of used oil onsite and a 1920 s gasoline pump north of the Former Garage. The ESA also identified Historical RECs (HRECs), including a 1974 spill of more than 5,000-gallons of gasoline, which affected two downgradient supply wells; a 1991 underground storage tank (UST) removal, which resulted in subsurface groundwater monitoring well installation; a hydraulic lift installed in 1955 and located in the Service Garage building and two out of service 6,000-gallon USTs. The Phase I ESA then recommended a Phase II ESA to further investigate the RECs. Details of the Phase I ESA are included in Appendix 1 on the CD. A Phase II ESA was completed by LBG in April The Phase II ESA included the completion of soil borings and the installation of additional groundwater monitoring wells. Additionally, on-site building materials were analyzed for the possible presence of lead and asbestos. Subsurface conditions at the site consisted of sand and gravel layers with building rubble (brick, slate, concrete) overlaying clayey silt and glacial till. The contents of the hydraulic cylinder were found to not contain PCBs or PAHs above laboratory method detection limits, but soils in the immediate vicinity were found to contain PAHs and PCBs above the EPA Regional Screening Levels (RSLs), with one soil sample exceeding the Toxic Substance Control Act (TSCA) of 50 parts-per-million (ppm). Additionally, sediment was sampled from the floor drain system and exhibited metals and PAH concentrations above the RSL. Groundwater was sampled in the vicinity of the floor drain and hydraulic cylinder and showed metals contamination exceeding the Vermont Groundwater Enforcement Standard (VGES). Bulk sampling of potential asbestos containing material (ACM) indicated the presence of chrysotile asbestos within the former Storage Building in window glazing as well as ACM brake pads and gaskets. Composite lead samples were collected from the former Storage Building paint, which failed the toxicity characteristic leaching potential (TCLP) analysis. A copy of the Phase II ESA is included in Appendix 1 on the CD. A supplemental site investigation (SSI) was complete by LBG in the Fall 2011, based on the findings of the Phase II ESA. Grid sampling was completed in the vicinity of the former hydraulic lift to determine the degree and extent of PAH and PCB contamination. PAH and PCB contamination was identified at the bottom of the cylinder excavation from five to six feet bgs, which extended to the north and east. Additionally, lead contamination in groundwater was confirmed. A copy of the SSI is included in Appendix 1 on the CD. In August 2013, R.E.A. completed the removal of PAH and PCB contaminated soils from the immediate vicinity of the former hydraulic lift as required by and in accordance with the CAP. The soil was to have been removed from the former cylinder hole from four to six feet bgs, which amounted to approximately 2.5 cubic yards (yds 3 ) of soil. As a precaution the excavation was completed to nine feet bgs and was over excavated horizontally by one foot in all directions. Following the removal of the soil, confirmatory sampling was completed. Soil was analyzed for the possible presence of PAHs and PCBs. Soil at approximately 5.5 feet bgs on the western wall of the excavation was found to contain PCBs at 9,300 ug/kg, which is above the corresponding VT DEC SSVs, but below the TSCA hazardous designation;

3 however, the soil is still under the TSCA non-dilution, non-contact clause and needs disposal at a TSCA approved facility, as the source was 75 ppm, which is above the TSCA Hazardous designation of 50 ppm. Additionally, the laboratory method detection limit was above the SSV for the PAH benzo(a)pyrene; therefore, the results for benzo(a)pyrene were inconclusive at that time. A copy of the LBG CAP and the R.E.A. PAH and PCB removal report have been provided on the CD and are referenced within this Request for Proposals (RFP). The CAP and R.E.A. report outline several Recognized Environmental Concerns (REC s) to be addressed. Residual PCB and PAH contaminated soils exist on-site in the vicinity of the former hydraulic lift, above the VT DEC SSV industrial cleanup criteria. Asbestos contaminated soil and asbestos containing material (furnace, safe, brake pads, gaskets) are present in the basement of the former Storage Building. Additional contaminants, such as PCBs and TPH are also present in the backfilled soils contained within the Service Garage basement. General & Site Work Requirements CONTRACTOR will adhere to all General Requirements, which includes submittals, Health & Safety Plan (HASP) and Soil Management Plans (Attachment 1, CAP) and the included asbestos abatement plan. CONTRACTOR will adhere to all Site Work requirements, which includes Proper Handling, Transportation and Off-site Disposal of asbestos contaminated soil and ACM; Proper Handling, Transportation and Off-Site Disposal of Excavated Material. The contaminated soil, ACM and debris services to be performed by the CONTRACTOR shall be as follows: 1. Mobilization / Demobilization CONTRACTOR shall mobilize and demobilize all equipment, materials, and personnel necessary to perform the SOW to the Site. All workers must have OSHA 40-hour HAZWOPER training/or be a licensed asbestos abatement contractor, and updated 8-hour refresher certification. CONTRACTOR shall ensure that only certified and licensed personnel complete asbestos related work (Attachment 3, CAP). R.E.A. will inform CONTRACTOR of environmental conditions at the Site, where known, and provide available chemical data for informational purposes (Appendix 1 & 2, CAP), but CONTRACTOR is responsible for preparing their own Health and Safety Plan (HASP) for use at the Site. Prior to commencing work, CONTRACTOR shall furnish R.E.A. with appropriate HAZWOPER and asbestos certification documentation for their employees, and provide a copy of their HASP. CONTRACTOR should assume at least one representative from R.E.A. will be on-site to independently document soil, debris and furnace removal procedures. CONTRACTOR will mark out subsurface utilities prior to commencing work, and will coordinate with DIGSAFE. 2. Dust, Erosion Prevention & Sediment Control CONTRACTOR will be responsible for temporary erosion control measures for the full construction period, to ensure that nearby contaminant free solids and waters are not affected by the completion of the work. Prior to the start of each section of the work, the CONTRACTOR shall ensure that appropriate silt fences and erosion controls are installed in the vicinity. Erosion control requirements are set forth in Figures C-1, C-2 & C-3 in the CAP and must be adhered to. Additionally, all asbestos contaminated soils shall be wetted prior to removal to ensure that asbestos fibers do not become airborne and pose a risk to nearby persons. 3. Disposal & Confirmatory Sampling & Analysis R.E.A. will be responsible for the collection and analysis of appropriate disposal and confirmatory samples from PCB and PAH contaminated soils from the area of the former Service Garage, and

4 PCB, PAH, TPH and VOC contaminated soil and debris from the former Storage Building. A town provided asbestos inspector will complete confirmatory sampling in accordance with regulations related to asbestos containing material. All excavations are to remain open until the results of the confirmatory sampling are received. Additional soil removal may be necessary, based on the confirmatory sampling analysis results. R.E.A. will complete all confirmatory sampling on a rush analysis basis, to ensure the project is completed in time. 4. Former Garage (Exhibit A) PCB and PAH contaminated soils exists in the immediate vicinity of a former hydraulic lift located beneath the former Service Station (Figure 3, Attachment 3, CAP). Prior to the commencement of the soil removal work, CONTRACTOR shall install appropriate erosion control measures, such as silt fences and sediment controls, to safeguard nearby clean surface soils and vegetation. CONTRACTOR can use PCB and PAH laboratory analysis results from the LB&G CAP for disposal. The CONTRACTOR shall dispose of the soils as a hazardous PCB (greater than 50 ppm), based on the original source (former hydraulic cylinder) at an approved TSCA facility, such as Model City in New York. The CONTRACTOR shall over excavate the area of the previous (29 August 2013) PCB and PAH contaminated soil removal at the former hydraulic lift location (R.E.A. Report, CD). The R.E.A. excavation was 5 x5 x9. Residual PCB contamination was detected in the western sidewall at approximately 5.5 feet bgs during confirmatory sampling completed by LGB after soil removal. Based on the Phase II ESA, the Supplemental Site Investigation and the CAP, all completed by LBG, the CONTRACTOR shall further excavate soils by a minimum of three feet horizontally on the western sidewall from five feet bgs to ten feet bgs, and the CONTRACTOR shall further excavate soils on the north, south and eastern sidewalls by a minimum of one foot from five feet bgs to ten feet bgs. Soils from the 2013 backfilling, within two feet eastward of the western sidewall, shall be removed and disposed of as hazardous PCB soils. The sum total of soil is expected to be removed is approximately 10 cubic yards. Following soil removal, R.E.A. shall collect one PCB and one benzo(a)pyrene sample from the western sidewall at approximately 5.5 feet bgs, and PAH samples for benzo(a)pyrene from the excavation bottom at ten feet bgs and from the three remaining sidewalls at approximately 5.5 feet bgs. The CONTRACTOR shall leave the excavation open until receipt of the laboratory analysis, which must show that contaminant concentrations are below the industrial concentration for PCBs and benzo(a)pyrene in the VT DEC SSV table. The contractor shall build a temporary OSHA approved fence around the open excavation during the wait for laboratory analysis results. Following confirmation of SSV requirements the CONTRACTOR shall backfill the excavation with clean fill and remove the fence. 5. Former Storage Building (Exhibit B) The basement of the former Storage Building was backfilled in the 1920 s, after the former store and house above burnt down. Based on available information, the store s basement was backfilled with debris from the buildings (bricks, wood, etc.) and fill. It is unknown the size of the basement that was backfilled. After the backfilling, a concrete pad was constructed over top (and may have extended beyond the basement) and a service garage was built on the slab. Based on available information, the building was used to repair vehicles and eventually for storage. The northern half of the area beneath the removed slab, contains obvious debris and asbestos. However, the southern half of the area beneath the slab contains no visible surface debris and may have had minimal fill placed over to create and even grade. The original stacked stone and granite block basement walls were part of the footer walls, which the Town of Middletown Springs would like to retain for future use, if possible. The CONTRACTOR shall stockpile field stone and granite blocks onsite after they have been washed for asbestos fibers. Based on a recent asbestos inspector site visit, the northern half of the basement contains loose friable asbestos contaminated soil and ACM including an old furnace, safe, brake pads and gaskets.

5 Additionally, the northern basement soils contain PCB Aroclors (1254 and 1260) above the VT DEC SSV for industrial soil, but below the TSCA hazardous designation of 50 ppm, and total petroleum hydrocarbons (TPH) in excess of the VT DEC industrial SSV of 1,000 mg/kg. The CONTRACTOR will dispose of the soils at a facility approved for both asbestos and chemical contaminant disposal. A copy of the laboratory analysis report is attached. The contractor shall wash debris for asbestos fibers in the excavation and separate out for landfill disposal. All chemical disposal and confirmatory sampling will be completed by R.E.A. The disposal samples will be analyzed on a normal time frame and confirmatory samples will be analyzed on a rush basis. The CONTRACTOR will leave the excavation open until the confirmatory sampling results are received and approval for backfilling is given by R.E.A. If the confirmatory sampling results indicate residual contamination remains, then the CONTRACTOR will be required to remove additional soils for transport and disposal. If a concrete slab is present at the bottom of the northern half of the basement then the slab will be tested for asbestos and chemical contamination. The outcome of the sampling will determine the fate of the concrete. If clean it may remain in the ground, but the town will make this decision. The CONTRACTOR shall excavate six test pits in the southern half of the former basement to eight feet bgs. An asbestos inspector will be onsite to determine if asbestos or ACM are present in the soils. R.E.A. will collect chemical disposal soil samples from the test pits to determine if the soil will require removal and off-site disposal or if it is clean and can stay in place. A limited portion of surface soils in the southwestern portion of the southern half of the former basement has TPH contamination above the VT DEC Industrial SSV. It is recommended that this soil be disposed of along with soils from the northern half of the basement. If the asbestos contractor or test pit disposal sampling determines that contamination exists, then the CONTRACTOR shall arrange for excavation, transport and disposal of the soils at the appropriate disposal facility. The CONTRACTOR shall complete the additional excavation, transport and disposal at the same cost presented on Exhibit B (2.0). Based on the dimensions of the basement, up to 463 cubic yards (yds 3 ) of contaminated soil/debris may need disposal by the CONTRACTOR. It is assumed that the excavation depth will be eight feet bgs, which is the likely basement depth below grade. The CONTRACTOR shall arrange to have the asbestos contaminated soil, ACMs including an old furnace, safe, brake pads and gaskets and PCB and TPH contaminated soils removed and disposed of by a qualified and certified asbestos contractor at an approved facility. The asbestos contractor shall comply with all State and Federal asbestos requirements included in abatement plan. Following soil and debris removal, the owner representative will collect confirmatory sampling from the sidewalls and bottom of the excavation. The CONTRACTOR shall to leave the excavation open until the sample results are received and approval is given by R.E.A. for backfilling.