SOIL MANAGEMENT PLAN

Transcription

1 SOIL MANAGEMENT PLAN BELFAST BOATYARD 39 & 41 FRONT STREET BELFAST, MAINE Prepared by: Ransom Consulting, Inc. 400 Commercial Street, Suite 404 Portland, Maine (207) March 22, 2013

2 1.0 INTRODUCTION The Belfast Boatyard property, located at 39 and 41 Front Street in the City of Belfast, Waldo County, Maine (the Site ), has been entered into the Maine Department of Environmental Protection (MEDEP) Voluntary Response Action Program (VRAP). As part of the MEDEP VRAP process, a Declaration of Environmental Covenant (DEC) will be filed with the Waldo County Registry of Deeds, as part of a deed restriction for the property. As mandated by the MEDEP, the conditions of the DEC are: 1. Property use shall remain commercial in nature. Change in use requires prior written approval by the MEDEP. 2. Any building constructed on the Property designed for human occupancy will be constructed with a vapor barrier and/or vapor extraction system to prevent the possible migration of petroleum vapors into the building. 3. The installation of a drinking water well, or the extraction of groundwater, is prohibited. 4. Any future earth work on the Property will be in compliance with a MEDEP approved Soil Management Plan (SMP) for the site. The SMP will describe procedures for all on-site excavations, segregation, soil testing and/or disposal determinations. In accordance with Condition 4 above and on behalf of the property owner, Ransom Consulting, Inc. (Ransom) has prepared the following Soil Management Plan (SMP), describing the procedures for all on-site excavations, segregation, soil testing, and/or disposal determinations. Ransom Project Page 1

3 2.0 SITE LOCATION AND BACKGROUND 2.1 Site Location & History The Site is known as the Belfast Boatyard located at 39 and 41 Front Street in the City of Belfast, Waldo County, Maine, identified as Lot 137 on Tax Map 11. A Site Location Map and a Site Plan are provided as Figures 1 and 2, respectively. The Site has been utilized as a waterfront wharf, since at least Historic uses include the storage of such commodities as coal, grain, guano, flour, hay, fertilizer, and livestock feed. Boat maintenance/repair activities, recently conducted at the Site, involve the use, storage, and disposal of hazardous substances including various paints, solvents, and engine fluids. The Site is bordered to the south by properties historically utilized by the Belfast and Moosehead Lake Rail Road. Municipal sewer and water utilities are available to the Site and surrounding area. 2.2 Previous Environmental Investigations In July and August 2012, Ransom completed Phase I and Phase II Environmental Site Assessments (ESAs) for the Site. Ransom s Phase I ESA identified Recognized Environmental Conditions (RECs) associated with the Site s current use as a boatyard facility utilizing hazardous materials, including various paints, solvents, and engine fluids at the Site. Surficial soil staining, indicative of a release of oil or hazardous materials (OHM), was observed on certain portions of the property during our reconnaissance. In addition, the historic industrial use of the Site and vicinity including ship building, railroad, bulk fuel storage, and other industries with historic destructive fires occurring along the waterfront of Belfast throughout the years were also identified as RECs. The Phase II ESA identified apparent urban fill throughout surficial and subsurface soils at the Site. Concentrations of polycyclic-aromatic hydrocarbons (PAHs) and metals (specifically arsenic) detected in surficial and subsurface soils exceeded their respective 2010 MEDEP Remedial Action Guidelines (RAGs) for the Outdoor Commercial Worker scenario. PAHs were not detected at concentrations exceeding their corresponding MEDEP RAGs for Excavation/Construction Worker scenario, with the exception of benzo(a)pyrene, which was detected in a soil sample collected from boring B102 at a depth of 8 to 10 feet below grade. Based on the depth of this sample, the concentration of benzo(a)pyrene was determined not to represent an exposure risk to Site employees or visitors. Arsenic was also detected in surficial soils at the Site at concentrations ranging from 13 to 18 milligrams per kilogram (mg/kg), which slightly exceeds the site-specific background concentration of 12 mg/kg. However, considering the commercial use of the Site as a boatyard for the foreseeable future, the arsenic concentrations in surficial soils are not anticipated to represent an exposure risk to Site employees or visitors. Laboratory analytical results for groundwater samples collected at the Site do not suggest that groundwater has been significantly impacted by Site activities or contaminant migration from off-site sources. The soil vapor sample collected from within the Site boundaries indicated low concentrations of VOCs and certain petroleum compounds; however the detected concentrations are not expected to represent an exposure risk, considering the current and proposed future use of the Site. Ransom Project Page 2

4 2.3 Contaminants of Concern and Applicable Guidelines The Contaminants of Concern (COC) at this Site are polycyclic aromatic hydrocarbons (PAHs) and arsenic. Based on our conversations with the MEDEP, the DRAFT 2012 RAGs will serve as applicable guidelines for this Soil Management Plan. Concentrations of COCs at the surface do not represent a direct contact exposure risk to current Site workers. However, these contaminants may represent an exposure risk to residents or the general public, if these soils were to be transported for offsite reuse. The surficial soils at the Site currently act as an effective cover or barrier to prevent contact with contaminated subsurface soils (deeper than 2 feet below grade), which contain contaminant concentrations above their respective DRAFT 2012 RAGs for Excavation/Construction Worker scenarios. If the surficial soils are disturbed or removed, additional remediation or mitigation measures may be required to prevent exposure to the more contaminated subsurface soils. Ransom Project Page 3

5 3.0 SOIL MANAGEMENT PLAN This Soil Management Plan will be implemented to assist owners, earthwork contractors, and/or other parties that may potentially disturb Site soils.. As part of the Soil Management Plan, the selected earthwork contractor or other parties potentially disturbing Site soils will be informed of the presence of contamination at the Site and the possibility that pockets of elevated contaminants may be encountered during the course of construction. The Soil Management Plan will require implementation under the following conditions: When contaminated soils at the Site are displaced and will be reused on-site; and When contaminated soils at the Site are displaced and will require off-site transport and disposal. 3.1 MEDEP VRAP Notification The property owner shall notify the MEDEP, prior to earthwork activities, for the following conditions: When excess soils will be generated that cannot be reused on-site. When subsurface soils (soils at depths greater than two feet below grade) will be excavated and reused on site or transported off-site for reuse or disposal. Minor disturbances of surficial soils for landscaping, surface regarding, paving, or other lowimpact activities at the ground surface do not require MEDEP notification. Contaminants at the Site are anticipated to be associated with historic boatyard and/or railroad operations or urban fill materials. In the event that contaminants from other sources are encountered (i.e. underground tanks, buried drums, free-phase petroleum product, etc.) the earthwork contractor shall notify the property owner, who will notify the MEDEP. 3.2 Environmental Professional Consultation An Environmental Professional ( EP ) must be retained to assist in planning the excavation, monitoring work practices and site conditions, and documenting activities performed at the site. The EP will provide guidance to the contractor and coordinate with the MEDEP. 3.3 Development of a Health & Safety Plan The EP will be responsible for conducting a health and safety meeting prior to construction activities. During the health and safety meeting, the types of contaminants likely to be encountered and routes of exposure will be discussed, as well as the mechanisms for distinguishing the general conditions from isolated pockets of elevated contaminants. In addition to the information provided by the environmental professional, the earthwork contractor will be responsible for developing their own site-specific Health & Safety Plan outlining the basic health and safety procedures which will be implemented to protect their workers and the general public. Ransom Project Page 4

6 3.4 Contamination Identification Based on previous Site investigations, soils at the Site are expected to contain contaminant concentrations which are unsuitable for reuse in residential or park use scenarios. The EP will conduct field screening for metals and other hazardous materials, and will direct the contractor accordingly. Any soils to be transported off-site will require laboratory analysis to further characterize the soil and determine an appropriate reuse or disposal scenario. All soils greater than 2 feet bgs are expected to contain fill material and concentrations of PAH compounds and metals (specifically arsenic) exceeding the 2012 DRAFT Outdoor Commercial Worker RAGs. As such, these soils are to be stockpiled and properly managed on the Site (Section 3.6), or disposed of at an appropriate off-site disposal facility (Section 3.8). 3.5 Soil Excavation Surficial soils (soils at depths less than two feet below grade) currently located at the Site are not considered to represent an exposure risk to future Outdoor Commercial Workers at the Site. Therefore, these soils may be disturbed and reused on-site without the need for additional remediation or mitigation efforts. However, subsurface soils (soils at depths greater than two feet below grade) at the Site contain concentrations of contaminants, which may present an exposure risk to Outdoor Commercial Workers. The surficial soils currently act as a cover system, preventing contact with the contaminated subsurface soils. If the subsurface soils are exposed by removal of the surficial soils, an alternate MEDEP-approved cover system must be installed to prevent exposure to the contaminated subsurface soils. cceptable cover systems include gravel and loam cover systems, asphalt paved cover systems, concrete building foundation cover systems, and landscaped cover systems. Specific types and locations of cover systems will be determined based on proposed work, reuse, and final approvals by the MEDEP. If contaminated soils cannot be relocated on-site beneath a cover system, soils may be reused or disposed of off-site under certain conditions. Before selecting an off-site reuse or disposal option, written or verbal approval from the MEDEP is required. The property owner will be responsible for notifying the MEDEP of any off-site reuse or disposal of soil potentially containing elevated levels of contaminants. 3.6 Material Stockpiling or Storage If earthwork activities result in excess soils that cannot be reused on Site, then the following actions should be taken: 1. Soils expected to contain elevated contaminant concentrations (soil with visible staining, coal ash, coal fragments, odors, or elevated field screening detections) should be segregated from soils that represent background conditions, and should be stockpiled separately for waste characterization by confirmatory laboratory chemical analysis; 2. Soils that cannot be reused on-site must be temporarily stockpiled, stored in roll-off disposal bins, or 55-gallon drums. If excess soils are stored in stockpiles, these soil stockpiles must be placed on top of one layer of at least 6-mil polyethylene sheeting or plastic tarp, and covered with similar sheeting or tarp to prevent runoff. Roll-off containers should be securely covered during temporary storage. 55-gallon drums Ransom Project Page 5

7 generated at the Site should be labeled with regard to the disposition of the soil, the date of generation, hazards associated with the soil, and a contact name; and 3. Soils to be disposed of off-site will be transported to an appropriate facility based on the results of waste characterization analysis. Waste characterization soil analysis is addressed in Section Soil Stockpile Maintenance Contaminated soil stockpiles should be evaluated daily by the earthwork contractor. Tears or punctures observed in the polyethylene sheeting should be repaired or the sheeting replaced. The evaluation will also confirm that, to the extent possible, storm water runoff is diverted away from the piles. If storm water runoff is expected or observed to be impacted by the stockpiled soil, the soil stockpiles will be surrounded by hay bales or silt fencing to minimize impacts to storm water runoff. 3.8 Analysis Required for Off-Site Disposal In order to assess applicable options for soil requiring off-site disposal, if necessary, waste characterization sample(s) will be collected for disposal characterization/waste profiling as required by the selected disposal facility. The waste material will be transported to the disposal facility by a licensed transporter. At a minimum, the soil samples will be analyzed for one or more of the following waste characterization parameters: Total petroleum hydrocarbons (TPH) by a modified U.S. EPA Method 8100; PAHs by U.S. EPA Method 8270C; VOCs by U.S. EPA Method 8260B; RCRA metals by various EPA methodologies; Flashpoint by U.S. EPA Method 1010; PCBs by U.S. EPA Method 8082; Corrosivity (ph) by U.S. EPA Method 9045; and Reactivity by U.S. EPA Methods and Upon receipt of the results of laboratory analysis, an appropriate method of disposal will be determined. If not proposed for reuse on-site, soils with contaminant concentrations above MEDEP RAGs will be disposed of at an approved disposal/treatment facility and will be transported off-site under a Bill of Lading or Uniform Hazardous Waste Manifest. Soils with contaminant concentrations below MEDEP RAGs can either be re-used on-site or transported off-site for disposal using a material shipping log. Ransom Project Page 6

8 4.0 CONTACTS Contact information for the Site: John Holmes (Owner) 101 Front Street Belfast, ME (207) Ms. Tracy W. Kelly Maine Department of Environmental Protection Division of Remediation 17 State House Station, Augusta, ME (207) Peter Sherr or Erik Phenix (Environmental Professional) Ransom Consulting, Inc. 400 Commercial Street, Suite 404, Portland, ME (207) Once an earthwork contractor has been selected to complete any proposed on-site excavation activities, installation of cover systems, and/or other soil management activities, their contact information, including the Project Foreman and Health and Safety Officer, should be added to this section. Ransom Project Page 7

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10 1. SITE PLAN BASED ON OBSERVATIONS MADE BY RANSOM CONSULTING, INC. ON MAY 23, AERIAL IMAGE PROVIDED BY GOOGLE EARTH. 2. SOME FEATURES ARE APPROXIMATE IN LOCATION AND SCALE. 3. THIS PLAN HAS BEEN PREPARED FOR THE CITY OF BELFAST. ALL OTHER USES ARE NOT AUTHORIZED, UNLESS WRITTEN PERMISSION IS OBTAINED FROM RANSOM CONSULTING, INC.