draft final gowanus canal superfund site brooklyn, new

GOWANUS CANAL DRAFT FINAL PHASE 3 RI TECHNICAL APPROACH AND SCOPE

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DRAFT FINAL

Gowanus Canal Superfund Site Brooklyn, New York

Phase 3 Remedial Investigation

Technical Approach

May 2010


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Table of Contents Introduction Site Description Background Phase 3 Field Investigation Activities Ecological and Human Health Risk Assessment Sampling Upland Investigation Attachment 1 Target Analyte List for Tissue Samples Target Analyte List for Air Samples Figures

Proposed Surface Sediment and Surface Water Sample Locations Proposed Surface Sediment and Surface Water Reference Locations Proposed Surface Sediment and Surface Water Reference Locations (zoomed to reference locations) Proposed Tissue Sampling Areas Proposed Air Monitoring Locations Proposed Monitoring Well Locations

Tables

Summary of Phase 3 sampling program Detailed list of Phase 3 samples Phase 3 - Monitoring Well Installation - Approximate screen depths for

intermediate monitoring wells


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Introduction

This document describes the Phase 3 remedial investigation (RI) activities at the Gowanus Canal Superfund Site (Site). Phase 1 of the RI activities was completed in December 2009 and January 2010 and included reviewing available information to identify the data needs for completing the remedial investigation/feasibility study (RI/FS) for the Site, developing a data collection approach for the RI, and performing a bathymetry survey of the canal. Phase 2 of the RI activities was completed in March and April 2010 and included performing a sediment coring investigation in the canal. Phase 3 of the RI activities is planned to begin in May 2010 and will include sampling of multiple media and an assessment of groundwater contributions to the canal. Planning activities to be completed during Phase 3 include project administration; review of any new background materials that become available; revision of the Quality Assurance Project Plan developed for the Phase 2 activities to include the Phase 3 activities, revision of the Health and Safety Plan, and revision of the Site Management Plan; and RI/FS field activities. Phase 3 field activities include subcontract procurement and management; sampling of surface water, surface sediments, and tissue; sampling of outdoor air; installation and sampling of groundwater monitoring wells; sampling of Combined Sewer Overflows (CSOs); and tracking and review for completeness of the received data. The results of all three phases of activities in combination with previously collected data will serve as the informational foundation for developing, evaluating, and selecting a remedy to eliminate, reduce, or manage risks to human health and the environment associated with the canal. The goal of the RI activities is to expeditiously develop the minimum amount of data and information necessary to proceed with this assessment and support the selection of an approach for site remediation and a well-supported Record of Decision (ROD).

Site Description

The Gowanus Canal Site is a 100-foot wide, 1.8 mile long canal located in the New York City borough of Brooklyn, Kings County, New York. The canal study area is shown in Figure 1. Connected to the Gowanus Bay in Upper New York Bay, the canal borders several residential neighborhoods including Park Slope, Cobble Hill, Carroll Gardens and Red Hook. The adjacent waterfront is primarily commercial and industrial, currently consisting of concrete plants, warehouses, and parking lots. There are five east-west bridge crossings over the canal, located at Union Street, Carroll Street, Third Street, Ninth Street, and Hamilton Avenue. The Gowanus Expressway and an aboveground section of the subway system pass overhead.


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Background

The Gowanus Canal, completed in the 1860s, was built to allow water access for industrial needs by bulkheading and dredging a tidal creek and wetland that was previously fished for oysters. The canal quickly became one of the nation’s busiest industrial waterways and was home to heavy industry such as gas works, coal yards, cement makers, soap makers, tanneries, paint and ink factories, machine shops, chemical plants, and oil refineries. It was also used as a repository of untreated industrial wastes, raw sewage, and surface water runoff for many decades causing it to become one of New York’s most polluted waterways. Although much of the industrial activity along the canal has stopped, high contaminant levels remain in the sediments. Despite ongoing pollution problems, some city dwellers use the Gowanus Canal for recreational purposes such as canoeing and diving, while others catch and eat fish. The City built a “Flushing Tunnel” in 1911 to replace stagnant canal water with fresh, oxygen-rich water to improve water quality. The tunnel was in operation until the 1960s when a mechanical failure caused it to shut down and the canal became stagnant and thus polluted once again. The City’s Department of Environmental Protection (NYCDEP) has subsequently restored water flow through the tunnel, which now operates 24 hours a day, seven days a week, bringing fresh water into the canal. The canal is part of the New York-New Jersey Estuary, which the EPA has designated an Estuary of National Significance.

Phase 3 Field Investigation Activities

The Phase 3 field investigation includes the following:

• Ecological and human health risk assessment sampling

• Upland investigation

Ecological and Human Health Risk Assessment Sampling

Attachment 1 contains the following figures showing the following:

• Locations where surface water and sediment samples are planned within the canal

• Reference locations in Gowanus Bay for surface water and sediment sampling

• Locations where air samples will be collected along the length of the canal and at reference locations removed from the canal

• The reaches in which the canal will be divided for the purpose of fish and shellfish tissue sampling (although if sufficient samples are not obtained, fish and shellfish tissue collection may become more opportunistic)

Also included in Attachment 1 are the following two tables:

• Summary of Phase 3 sampling program


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• Detailed list of Phase 3 samples The final locations may be adjusted / refined from those shown in Attachment 1 before the start of the field activities or during the field effort based on further observations of conditions in the canal. It should be noted that several of the sampling events included in this phase of investigation are driven by weather conditions. Wet weather sampling can occur only when at least 1/10 of an inch of rainfall occurs with low tide conditions and needs to begin shortly (3-6 hours) after the start of the rain event. Dry weather sampling needs to occur a minimum of 2-3 days after a rain event. Weather conditions will be monitored closely to ensure that samples are collected under the appropriate weather conditions.

Surface sediment

• Samples will be collected from 27 locations within the Gowanus Canal and from 10 reference locations in New York Harbor, outside the mouth of the canal.

• The 10 reference locations were initially selected to provide an approximate grid with increased spacing with increasing distance from the mouth of the canal. The locations were then adjusted to be situated in areas where organisms are expected to occur (i.e., locations 330, 331, 332, 333, 334 were adjusted to be located on a shoal rather than in the deep channel). Adjustments were also made so that the locations are not in shipping channels to allow for practical collection of the samples. The coordinates of the selected reference locations have been established and will be used by the field team to position at the target locations using a GPS. Final adjustments may be needed in the field based on observed conditions. The field teams will record the reasons for the adjustments and the coordinates of the adjusted locations in the field log book.

• Samples will be collected using an appropriate grab sampling device (e.g., ponar, VanVeen, modified VanVeen, or clam shell type grab sampler).

• Samples will be collected when there are no discharges from CSOs into the canal.

• Sediment samples will be described with respect to gross grain size, color, odor and any other notable observations during field collection.

• Samples will be collected from the top approximately 0.5 feet of sediment and will be analyzed for the following parameters: TCL Organics, TAL Metals (including Mercury), Cyanide, TOC, AVS/SEM, and grain size. Sediment samples for the AVS/SEM analysis are proposed for collection from the same depth (0 to 6 inches) as samples for the sediment bioassay and chemical analytical testing. Collecting samples from the same depth for all analyses will facilitate the interpretation of the outcomes provided by each interrelated data set and support the weight-of-evidence data evaluation and interpretation.

• A total of 11 field samples (8 from locations in the canal and 3 from reference locations) will also be collected for PCB congeners analysis. The locations in the canal that will be sampled for PCB congeners are: 301, 305, 307A, 308A, 308B, 312, 320, and 325 (note that locations 308A and B are situated on the two ends of the canoe launching area). These


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locations were selected to 1) provide data for areas with the greatest potential for human exposure (i.e., the canoe launch); 2) provide data in areas where high PCB concentrations were previously measured in sediment, and 3) to provide spatial coverage throughout the canal. The reference locations that will be sampled for PCB congeners are 326, 330, and 333.

• Additional sample volume will be collected at all sampling locations and archived for future analysis if needed.

• In all cases, the analyses that will provide the lowest detection limits will be requested and adjustments to higher detection limits, if necessary, made by the laboratory based on the level of contamination noted in each sample.

• A total of 16 sediment samples (from 11 locations within the Gowanus Canal and 5 reference locations) will be collected for sediment toxicity tests.

− The locations in the canal where the toxicity test samples will be collected are: 303, 307A, 309, 310, 313, 314, 315, 318, 319, 321, and 324. The reference locations where the toxicity test samples will be collected are: 326, 328, 329, 330, and 333.

− The toxicity testing will be performed using two species: amphipod (L. plumulosus) and a polycheate (Nereis).

− The measurement endpoints for the L. plumulosus test will be survival, growth, and reproduction, while the endpoints for the Nereis test will be survival and growth.

Surface water

• Samples will be collected from the same 27 locations within the Gowanus Canal and 10 reference locations where surface sediment samples will be collected.

• Samples will be collected during one wet weather and one dry weather event for a total of 74 field samples.

• Samples will be analyzed for TCL Organics, TAL Metals (total and dissolved including Mercury), Cyanide, and Total Suspended Solids (TSS).

• Field measurements of Salinity, pH, Specific conductance, Dissolved Oxygen, Oxidation Reduction Potential (ORP), Temperature, and Turbidity will be taken at each location.

• Surface water samples will be collected from approximately 6 inches below the water surface using a discrete depth sampling device such as a Kemmerer or VanDorn bottle or equivalent to collect volume for preserved samples. Bottles for unpreserved analyses will be filled directly by submerging the sampling container and removing the cap at the desired depth.

• Water quality data for non-contaminant stressors, including measurements of dissolved oxygen, temperature, and salinity, at up to 7 locations throughout the Gowanus Canal and Bay will be evaluated and considered as part of the ecological risk assessment. It is assumed that existing data will be obtained from the NYCDEP Harbor Survey Monitoring Program.


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Fish and shellfish tissue

• Fish and shellfish (crab) tissue samples will be collected within the Gowanus Canal and from reference area(s).

• The collection of fish and crab samples will be an iterative process that will need to be modified depending upon what can be collected at each of the selected sample locations. The field sampling team will therefore need to maintain regular communications with the ecological risk assessment technical lead throughout the course of the field tissue collection. Check-in calls between the field team and the ecological risk assessment technical lead will be conducted at least twice a day during the field sample event to provide updates about the sample effort (e.g., sample methods and locations) and resulting catch. The ecological risk assessment lead will in turn communicate with the USEPA on the species captured and whether any modifications are needed to the developed approach.

• The tissue sampling is anticipated to begin in mid June 2010 and continue for up to 15 days. Both target species and alternate species for the sampling have been identified. It should be noted that reasonable attempts will be made to collect the targeted organisms, however, if the organisms are not present in a given reach of the Canal, the attempts made will be documented and samples may not be able to be acquired. If sufficient numbers of organisms of the alternate species are captured, those organisms may be submitted for analyses.

• The target species for this event and alternate species, if target species are not available, include the following:

Small Prey Fish Target Species – Mummichog Alternate Species - Killifish

Crab Target Species – Blue crab Alternate Species – Determine onsite (collected crab needs to be large enough to allow tissue to be picked)

Larger Fish Species Target Species – Striped bass, white perch Alternate Species - American eel, cunner (i.e. bergall, choggie, ocean perch), tautog (i.e. blackfish), winter flounder

During at least the first two days of the sampling event, all potential target species and alternate species that are captured will be retained on ice for possible use. With the exception of crab, all species that are not target species and not alternate species, captured during this initial period will be quantified and released. All crabs that are large enough for tissue to be picked will be retained for possible use.

• During at least the first two days of the sampling event, all sizes of target and alternative species that are captured will be retained on ice for possible use. Depending on the initial catch, preference for Larger Fish Species (see above) and for Crab (blue crab) may be given to individuals that fall within existing legal size limits for recreational fishing if individuals within these sizes are available. If individuals within the existing legal size


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are not available, a determination will be made in consultation with the USEPA on the sizes to retain. Legal size limits for recreational fishing are identified below.

Striped Bass: 28” - 40”

Tautog: 14”

American Eel: 6”

Winter Flounder: 12”

Blue Crab: 4.5” (hard shell)

Small prey fish (mummichog/killifish) will be evaluated only in the ecological risk assessment and all sizes of these fish can be retained for use. Small fish not needed for the human health risk assessment (i.e., small striped bass, white perch, or alternate species) may be retained for whole body tissue analysis for possible use in the ecological risk assessment.

• Tissue sampling within the Canal will consist of the following:

− Mummichog

− 6 sampling locations selected to provide coverage of the Canal (e.g., using the bridges to divide the Canal into 6 reaches - 401 through 406 – please refer to figure in Attachment 1)

− 1 composite tissue sample per location will be targeted

− Samples will be whole body

− Minnow traps will be used for mummichog collection

− The traps will be initially set at locations where sediment samples for toxicity testing were collected within each reach. The traps may need to be moved if sufficient species are not captured to make the needed sample volume for analysis.

− Blue Crab

− 6 sampling locations as described above

− 2 composite tissue samples per location will be targeted

− 1 edible tissue composite

− 1 hepatopancreas tissue composite

− Crab pots will be used for blue crab collection

− The pots will be initially set at locations where sediment samples for toxicity testing were collected within each reach. The traps may need to be moved if sufficient species are not captured to make the needed sample volume for analysis.

− Striped Bass and White Perch

− Fish will be caught along the length of the Canal where ever found

− For each species, target is 6 composite fillet tissue samples and 6 composite samples of the rest of the carcass (total of 12 samples for each species)

− Fillet data will be used in HHRA, and fillet plus carcass data will be combined to represent whole fish concentrations


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− The larger sport fish will be collected using fyke or hoop nets, seines or gill nets, or angling. The collection of sport fish may require a combination of all three sampling methods in order to collect sufficient organisms.

− Reference samples for each tissue type, will be collected from 5 reference sites situated at the mouth of the Gowanus Canal and into the Gowanus Bay. The general area where the reference tissue samples will be collected is referred to reach 407. All of the selected reference surface water and sediment samples are situated within reach 407.

− The reference sites for the mummichog and blue crab within reach 407 will be initially set at locations 326, 328, 329, 330, and 333 where reference sediment samples for toxicity testing are planned. From there, the traps / pots may need to be moved to other locations within reach 407 if sufficient species are not captured at the initial locations to make the needed sample volume for analysis.

− The reference samples for the larger fish will be obtained in the general area of reach 407 where the surface water and sediment reference samples are situated.

• The analytical scheme for the tissue samples is identified below. The targeted list of analytes was selected based on the constituents detected in shallow sediments (0-3’) during the previous investigations that are also known to be bioaccumulative. If insufficient tissue mass for all chemical analyses is recovered after attempting various recovery schemes, then analyses will be performed in the order shown below. PAHs, PCBs and metals are expected to be the primary constituents of concern based on review of existing data. PAHs will be analyzed in crab tissue only because PAHs do not bioaccumulate in fish. If insufficient tissue mass is available for both PCBs and metals analysis, then a final decision about analytical parameters will be made in consultation with EPA.

− Blue crab: 1. PAHs (TCL-SVOCs) 2. PCB congeners and TAL metals (including mercury) 3. Pesticides (TCL-Pest)

− Mummichog, striped bass, and white perch: 1. PCB congeners and TAL metals (including mercury) 2. Pesticides (TCL-Pest)

− All samples will be analyzed for percent moisture and lipid content The target analyte list for tissue samples is provided in Attachment 1.

Ambient air

• Air samples will be collected from 10 locations along the canal and from 3 locations selected taking into consideration the predominant wind direction.

• The background locations were placed upwind from the canal based on predominant


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wind direction. The locations will be finalized following site reconnaissance to accommodate location logistics considerations.

• Two rounds are planned – one before and one after the start of the canal oxygenation system being installed by New York City. Air sampling will occur 2-3 days following a rain event.

• At each location along the canal, two samples are planned – one at canoe level and one at street level. The samplers at the canoe level and some of the samples at the street level will need to be installed from the water.

• A total of 46 field air samples will be collected.

Samples will be 24-hour composite samples. All samples will be analyzed for VOCs and PAHs. One sample collected at street level (location 506 at the street level) will be analyzed for PCBs. Samples for VOC analysis will be collected using Summa canisters. Samples for analyses for PAHs will be collected using low-volume samplers. The sample for PCB analysis will be collected using high-volume sampler and was selected at a location where it can be secured and an electrical drop line provided for the operation of the sampler.

The target analyte list for the air samples is provided in Attachment 1.

Combined Sewer Overflows (CSOs) to the Canal - water and sediment

• Water and sediment samples will be collected from the following 10 CSOs discharging to the canal:

RH-031Bond-Lorraine Sewer relief at Lorraine and Smith Streets RH-0034 Gowanus Pump Station RH-033 Regulator R-25 at Nevins and Douglass Streets RH-035 Bond-Lorraine Sewer relief at Bond and 4th Streets RH-037 Regulator R-23 at Nevins and Sackett Streets RH-036 Regulator R-22 at Nevins and President Streets RH-038 Regulator R-24 at Nevins and Degraw Streets OH-005 3rd Avenue sewer relief at 3rd Ave. and Carroll St. OH-006 3rd Avenue sewer relief at 3rd Ave. and 19th St. OH-007 2nd Avenue Pump Station at 3rd Ave. and 7th St.

A map of the CSO sampling locations will be prepared and superimposed on a map showing the CSO discharge points into the Canal after the final sampling points are selected.

• Water samples will be collected during one dry and three wet weather events for a total of 40 field samples. Wet weather sampling will occur only when at least 1/10 of an inch of rainfall occurs with low tide conditions and will begin shortly (3-6 hours) after the start of the rain event. Dry weather sampling will occur a minimum of 2-3 days after a rain event. At one location (the Gowanus Pump Station), the sample will be collected using an auto sampling device. At the remaining nine locations, grab samples will be collected from manholes where regulators/relieve valves are located upstream of the CSO discharge into the canal. Samples from these manholes are expected not to include backflow (tidal intrusion) from the canal and represent the flow discharging through the


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CSOs into the canal. The dry weather event will be conducted first and used to assess sampling protocols. The CSO has sanitary and street runoff components. Dry weather sampling will indicate whether there are sanitary sources of contaminants in the CSO discharges that may be contributing to conditions in the canal.. The dry weather sampling event will include the collection of both water and sediment samples. Wet weather samples will be used to assess the combined flow discharging through the CSOs into the canal. The wet weather sampling events will include the collection of water samples.

• A field reconnaissance site visit will be performed at the start of the field activities to verify sampling locations and conditions and make arrangements for dry and wet weather sampling. This will require entering the Gowanus Pump Station to identify a suitable location for the installation of an automatic sampler with a flow or hydrostatic sensor that will trigger sampling when a wet weather event begins. The field team will also inspect monitoring locations in the streets around the Canal to verify manhole or regulator access locations, and suitability for sampling.

• The following analyses are planned:

− Water samples - TCL Organics, TAL Metals (total and dissolved including Mercury), Cyanide, and TSS. Field measurements of Salinity, pH, Specific conductance, Dissolved Oxygen, Oxidation Reduction Potential (ORP), Temperature, and Turbidity will be taken at each location.

− Sediment samples - TCL Organics, TAL Metals (including Mercury), Cyanide, TOC and grain size. Sediment samples will be described with respect to gross grain size, color, odor and any other notable observations during field collection. Sediment samples will be composites of the sediments that are brought to the surface (except for the sample for VOC analysis which will be collected from the area of highest PID response or evidence of contamination based on visual observations of the sediments brought to the surface).

Other activities

During the field activities, the following will be performed by the field team and reviewed by the project technical leads:

• Case reports.

• Field sample management using FORMS II Lite and shipping samples to laboratories

• Daily quantities tracking and reconciliation.

• Daily review of logs and other information for technical decisions and to verify completeness and accuracy.

• Weekly downloading of GPS information (note: GPS coordinates for sampling locations also will be recorded in the field log book and on field forms at the time of sampling).

• Weekly downloading of photographic documentation.

• Weekly creation of photographic log.

• Assembling field documentation (i.e., field log book and sediment core logs).

• Prepare weekly status reports to EPA on completed activities

• Incorporate sampling locations into GIS.


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• Prepare draft sampling location maps, field-collected data tables, and sediment sample summary tables.

Samples will be collected using appropriately-sized boats. Sample location coordinates (locations as shown in the figures in Attachment 1) were established as part of the project planning and data needs definition phase. The sampling teams will position / target these locations using a GPS. Final adjustments may need to be made in the field based on observed conditions. The teams will record the reasons for these adjustments and the coordinates of the adjusted locations in the field log book. Field collection details will be recorded on the applicable sampling logs. Samples will be periodically transported to shore for processing at the field office. Disposable sample processing equipment will be used to minimize the potential for sample cross-contamination. The appropriate sample jars will be filled and delivered to the sample custodians. After each sample is processed, the excess sample material and used sampling equipment will be collected and placed in the designated waste storage container(s), and the work area will be cleaned in preparation for the next sample.

Upland Investigation

The upland investigation includes the installation of 39 monitoring well pairs (shallow and intermediate) and 3 intermediate single monitoring wells along approximately 3 miles of canal frontage (east and west side of canal). This results in a total of 81 monitoring wells being installed along the length of the canal. The newly installed monitoring wells will be used together with selected existing monitoring wells to evaluate groundwater to surface water interaction (GSI) and the potential for groundwater contributions to the Canal as well as general contamination conditions along the length of the canal. Monitoring wells will be installed and sampled by different entities but follow the construction details and sampling procedures established for the investigation in order to meet the established objectives. Other activities include:

• Sampling of soils in select monitoring wells

• Synoptic water elevation measurements

• Continuous water elevation data logging in select wells and canal

• One round of groundwater samples and surface water samples at selected locations along the length of the canal for the purpose of evaluating GSI

Installation and development of monitoring wells

Attachment 1 contains a figure showing the planned monitoring well locations and a table describing the sampling program including the number of samples to be collected. The selected monitoring well locations may be adjusted / refined before the start of the field activities based on further observations and access conditions.

Subsurface utilities will be delineated at each proposed drilling location.


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Appropriate traffic control measures will be provided at the work locations throughout the duration of investigation activities. Road closures are not anticipated but lane restrictions may be necessary in some work locations. Appropriate warning signs, cones, barricades, and other protective devices will be utilized. It is assumed that police escort is not required as part of the traffic control measures.

RotaSonic (Sonic) drilling will be performed using two complete drilling crews simultaneously. At least one of the two drill rigs will be a “Mini-Sonic” or track mounted rig that is suited for congested work areas.

Appropriate permits, licenses, and registrations required to complete the work will be obtained including but not limited to federal, state, and/or local/city government requirements including drilling registrations, and local road opening/drilling/traffic control permits.

Technical details of the drilling program include the following:

1) Sonic drill tooling of 8-inch diameter override casing and 4-inch diameter core barrels will be used.

2) All soil boring locations will be continuously soil cored using 4-inch diameter core barrels to the terminal depth of the boring for observation and logging of lithology. The lithology of the soil cores will be logged and each core will be screened utilizing a photoionization detector (PID) and visually observed for signs of contamination. Photographs of soil cores will be collected as needed. The maximum estimated depth of the borings is approximately 50 feet below grade.

3) Soil sampling will be performed during installation of select monitoring wells. Continuous soil sampling will be performed over the full length of the soil boring for analyses for TCL Organics, TAL Metals (including Mercury), and Cyanide. Composite samples will be collected over discrete 5-foot intervals for all analyses except for the VOC constituents which will be a grab-sample biased to the 6-inch interval within the 5-foot composite that shows the highest PID readings or visual indication of contamination. If uniform conditions are observed in the 5-foot interval, then the VOC sample will be collected from the middle of the interval.

4) All soil boring locations will be converted to monitoring wells. Borings will be completed as nested well pairs where two unique wells will be installed within one large diameter borehole.

5) The “shallow” wells will be installed straddling the water table which is estimated from previous work as occurring between 6 to 10 feet below ground surface (bgs) near the canal and 15 to 18 ft bgs further inland. The shallow wells will be constructed with a 10-foot long screen.

6) The “intermediate” depth wells (i.e. the deeper of the two nested wells) will be designed on a case-by-case basis depending on local ground surface elevation and depth of the canal bottom (i.e. the elevation of the top of the native sediments underlying the canal as opposed to the top of the soft “mucky” accumulated recent sediments). The intermediate wells will be designed so that the top of the 5-foot long screen is positioned approximately 5 feet below the top of the native sediment at the bottom of the canal. The top of the well screen for the intermediate depth wells is


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estimated to range from 25 to 40 ft bgs. The depth of the native sediments in the canal will be determined based on the results of the Phase 2 sediment coring investigation in the canal and the depth of the individual wells pre-determined before the start of the drilling activities.

The additional objectives of the shallow wells (to straddle the water table) and intermediate wells (evaluating groundwater below the base of the canal) limit the flexibility in well screen depth interval selection. Recent evaluation of ground surface elevations and elevations of the contact between native sediments and overlying soft sediments in the canal, however, indicate that at least a 10-foot separation is anticipated between the shallow and intermediate screen intervals. This notwithstanding, a vertical separation between the base of the shallow and base of the intermediate screens of at least 3 feet is desirable as a measureable vertical distance between the screen elevations and is required for calculation of a meaningful gradient. Note that the well clusters will be installed within the same large diameter borehole so variations in the lateral distances of the wells from the canal will not be an influencing factor for the vertical gradient calculations.

7) Monitoring wells will be constructed of 2-inch diameter Schedule 40 PVC well casing with machine slotted screen with 0.01-inch diameter (10-slot) slotting. Well riser pipe will be flush threaded with O-ring seals. The well will be fitted with a bottom plug and locking water-tight compression expansion cap. Keyed-alike locks will be installed on each well.

8) The “shallow” wells will be constructed with a 10-foot long screen and the “intermediate” wells will be constructed with a 5-foot long screen.

9) The wells will be finished using 10-inch diameter flush-mount manhole completions with a 12-inch steel skirt/collar. The manhole will be set in a 2-foot x 2-foot x 1-foot deep concrete pad.

10) Materials will be pre-cleaned and individually wrapped by the manufacturer. Materials in damaged packaging will be pressure washed and decontaminated prior to use.

11) The two nested wells (shallow & intermediate) will be constructed within the same large diameter borehole using alternating sequences of well gravel, transition sand and bentonite to fill the annular space. In general, construction of the wells will consist of #1 well gravel (or equivalent appropriately sized to a 10-slot screen) to 2 feet above the “intermediate” screen, certified acetone free bentonite chips to 4 feet below the bottom of the “shallow” well screen, # 1 well gravel to 2 feet above the top of the “shallow” well screen, and hydrated bentonite chips to ground surface. Specific well construction will be determined on a case-by-case basis in the field by the field geologist based on observed occurrence of the water table and the target depth of the Intermediate well.

12) Sand and bentonite materials for completion of the annular space will be gravity fed into the borehole at a sufficiently slow pace to prevent ‘bridging’ of the annular space with continuous sounding of the material depths using a weighted tape.

13) Monitoring wells will be developed no sooner than 24 hours after construction.


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14) Development will be performed using a combination of a surge block and submersible pump. Pumping will commence at the bottom of the well. The submersible pump will be raised in increments to develop the entire well screen interval. Polyethylene tubing will be replaced between drilling locations and the equipment decontaminated.

15) Development will continue until one of the following conditions are met and the sediment thickness remaining in the well is less than five percent of the screen length (e.g.; 6 inches of sediment in a 10-foot screen):

− Stabilization of water quality parameters. Stabilization is defined as less than 10 percent variance between the removal of two successive well volumes. Turbidity measurements are critical development criteria, with a target level of 15 NTUs or lower.

− Five well volumes have been purged from each well (including the saturated filter material in the annulus) plus the volume of water added during the drilling processes (if any) have been removed from the well, regardless of stabilization of the water quality parameters

16) Before the onset of drilling, after each hole, and before leaving the site, any part of the drilling equipment that has been in contact with the soil (including work platforms of the rig) will be decontaminated using a phosphate-free detergent (Alconox/Liquinox) solution scrub and high-pressure hot water until visible contamination is removed.

17) The monitoring wells will be surveyed (location and elevation) and incorporated onto the overall site plan. In addition to the monitoring wells, one reference measurement point benchmark will be installed on each property on the bulkhead at the Canal. The reference point will be surveyed (location and elevation) and used as a staff gauge benchmark to collect water level measurements from the canal at the same time that groundwater elevations are measured in the monitoring wells.

Table 3 contains the screen interval target depths for the Phase 3 intermediate monitoring wells. The top of screen depth was calculated by determining the elevation of the native sediment layer at the bottom of the canal observed in nearby sediment cores, adjusting to the ground elevation at each location, and placing the top of each screen at 5 feet below the top of the native sediment layer.

Hydrogeologic Evaluation and Groundwater Sampling

The following will be performed:

• Synoptic water elevation measurements

• Continuous water elevation data logging in select wells and canal

• One round of groundwater samples and surface water samples at selected locations along the length of the canal for the purpose of evaluating GSI

Technical details include the following:

• Six rounds of monthly synoptic water elevation surveys. Measurements will be collected in installed monitoring wells and from the staff gauge reference points in the canal. Each of the six synoptic surveys will be completed within a 3-hour period to


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minimize tidal influences. Monthly events will be scheduled such that measurements are collected during different stages of tidal cycles.

• Continuous water elevation data logging will be performed in 22 wells (shallow and intermediate) spatially distributed across the study area and at 6 locations within the canal (plus one barometric transducer) to evaluate tidal influences on the groundwater / surface water system. The monitoring well pairs where the continuous monitoring will be performed were selected to provide full coverage of the length of the canal and include the following monitoring wells listed in the order of their occurrence from the head to the mouth of the canal: 33, 3, 4, 25, 26, 20, 21, 13, 14, 15, 16.

• One round of groundwater samples will be collected from all monitoring wells for the following analyses:

− Samples from all wells for TCL Organics and TAL Metals (total and dissolved including Mercury), and Cyanide.

− Samples from 12 of the monitoring well pairs (24 wells) (and surface water from the adjacent canal, 9 locations) for the following water quality parameters: Alkalinity, Ammonia, Calcium, Chlorides, Iron – Total, Iron – Dissolved, Magnesium, Manganese – Total, Manganese – Dissolved, Aluminum, Nitrates, TKN, Organic Carbon – dissolved, Organic Carbon – Total, Potassium, Phosphate, Total Hardness, Silica, Sodium, Sulfates, Total Dissolved solids (TDS), and Total Suspended Solids (TSS). The samples from the canal will be collected from the land and will target the 6 inches of water above the bottom of the canal. The samples will be collected during dry weather and during low tide as close as possible to the end of the groundwater sampling event.

− The monitoring well pairs (shallow and intermediate) that will be sampled for water quality parameters (listed in the order of occurrence from the head to the mouth of the canal and also identified in Attachment 1) are: 2, 3, 4, 9, 11, 12, 15, 16, 18, 31, 37, and 39. These locations were selected to provide full coverage of the length of the canal for assessing groundwater contributions to the canal. The locations of surface water in the canal that will be sampled will be near monitoring well locations 2,3,9,11,15,18,31,37, and 39.

− Field measurements of the following water quality parameters will also be collected during groundwater sampling and from the surface water sampling locations: Salinity, pH, Specific conductance, Dissolved Oxygen, Oxidation Reduction Potential (ORP), Temperature, and Turbidity. In addition, field measurement of Ferrous (+II) Iron will be conducted in the 8 monitoring well pairs and surface water samples sampled for water quality parameters.

− Water quality analyses will characterize the chemistry of canal water and groundwater across the breadth of the site including cation/anions composition, oxidation/reduction potential, the presence of nutrients, biological activity, and native acidity. In concert with the evaluation of water levels, these analyses can help determine the bulk and spatial, contribution of groundwater to the canal. A suite of tools will be utilized including ternary diagrams, water quality mapping, phase diagrams, and geochemical modeling to evaluate the water quality data


17

− The sampling will be performed a minimum of two weeks following installation and development of the new monitoring wells. Sampling will be performed using submersible pumps following USEPA’s low-flow groundwater sampling procedures.

Other activities

During the field activities, the following will be performed by the field team and reviewed by the project technical leads:

• Case reports.

• Field sample management using FORMS II Lite and shipping samples to laboratories

• Daily quantities tracking and reconciliation.

• Daily review of logs and other information for technical decisions and to verify completeness and accuracy.

• Weekly downloading of GPS information (note: GPS coordinates for sampling locations also will be recorded in the field log book and on field forms at the time of sampling).

• Weekly downloading of photographic documentation.

• Weekly creation of photographic log.

• Assembling field documentation (i.e., field log book and sediment core logs).

• Prepare weekly status reports to EPA on completed activities

• Incorporate sampling locations into GIS.

• Prepare draft sampling location maps, field-collected data tables, and sediment sample summary tables.


18

Attachment 1


19

Target Analyte List for Tissue Samples

Metals

Arsenic

Cadmium Chromium CLP does not analyze for Cr VI, will use these

results as indication of Cr VI

Copper

Lead

Mercury Results for mercury in fish tissue will be considered as representative of the presence of methylmercury

Nickel

Selenium

Silver

Zinc

PAHs

Acenaphthylene

Acenaphthene

Anthracene

Fluorene

Phenanthrene

Benzo(a)anthracene

Benzo(a)pyrene

Benzo(b)fluoranthene

Benzo(k)fluoranthene

Benzo(g,h,i)perylene

Chrysene

Dibenz(a,h)anthracene

Fluoranthene

Indeno(1,2,3-cd)pyrene

Pyrene

Pesticides

alpha-BHC

beta-BHC

delta-BHC

gamma-BHC (Lindane)

Heptachlor

Aldrin

Heptachlor epoxide

Dieldrin

4,4'-DDE

Endrin

Endosulfan II

4,4'-DDD

Endosulfan sulfate Not on the list of bioaccumulators, included because endosulfan is on the list

4,4'-DDT


20

Methoxychlor

Endrin ketone Same

Endrin aldehyde Same

alpha-Chlordane Same

gamma-Chlordane Same

PCBs

Congeners

Basis for inclusion on target list: Compounds included are those that were detected

in shallow sediments and have bioaccumulating potential. Note that this results in a

target list that is reduced from the TCL and TAL list. Because of matrix

considerations, this reduced list will be requested for analyses to minimize potential

for interferences. Compounds can be reported by SOM01 or ILM05. Included all

metals.


21

Target Analyte List for Air Samples

VOCs

Acetone

Benzene

Bromodichloromethane

Bromoform

Carbon Disulfide

Chloroform

Chlorobenzene

Chloromethane

Dibromochloromethane

Ethylbenzene

Methylene Chloride

Methyl-tert-butyl ether (MTBE)

2-Butanone

Styrene

Toluene

Trichloroethylene

Xylene, total

PCBs

Aroclor 1016

Aroclor 1221

Aroclor 1232

Aroclor 1242

Aroclor 1248

Aroclor 1254

Aroclor 1260

PAHs

Acenaphthene

Anthracene

Benz[a]anthracene

Benzo[a]pyrene

Benzo[b]fluoranthene

Benzo[k]fluoranthene

Chrysene

Dibenz[a,h]anthracene

Fluoranthene

Fluorene

Indeno[1,2,3-cd]pyrene

Naphthalene

Pyrene

Acenaphthylene

Phenanthrene

Benzo(g,h,i) perylene

Basis for inclusion on target list: Compounds included on above list are those that were detected in shallow sediments.

18TH ST

3RD ST

1 ST

PRESIDENT ST

YCKOFF ST

CO

LUM

BIA

TOM

PKIN

S P

3RD

AVE

9TH ST

4TH

AVE

14TH ST

15TH ST

3RD ST

SMIT

H ST

CO

UR

T ST 2N

D AV

E

12TH ST

13TH ST

UNION ST

10TH ST11TH ST

5TH

AVE

7TH ST

8TH ST

HO

YT S

T

SACKETT ST

16TH ST

2ND ST

BOND

ST

1 PL

2 PL

19TH ST

4 PL

CLI

NTO

N S

T

3 PL

HEN

RY

ST DE GRAW ST

17TH ST

HIC

KS S

T

W 9TH ST

BALTIC ST

4TH ST

1ST ST

DOUGLASS ST

NEVI

NS S

T

LUQUER ST

BUTLER ST

LORRAINE ST

BAY ST

BUSH ST

PROSPECT AVE

NELSON ST

20TH ST

CENTRE ST

HUNTINGTON ST

CREAMER ST

GARNET ST

CARROLL ST

BRYANT ST

PRESIDENT ST

HAM

ILTO

N PL

SUMMIT ST

RAPELYE ST

WOODHULL ST

HALLECK ST

DEN

NET

T PL

COLES ST

4TH

AVE

HEN

RY S

T

CARROLL ST

2 ST

CARROLL ST

5TH ST

BAY ST

BUTLER ST

PRESIDENT ST

BQE

PRESIDENT ST

CARROLL ST

HAM

ILTON AVE

NELSON ST

PROSPECT EXPRESSWAY

CO

UR

T ST

CEN

TRE

MAL

L

CO

UR

T ST

6TH ST

HAMILTO

N AVE / G

OW

ANU

S EXPRESSWAY

9TH ST

5TH ST

UNION ST

W 9TH ST

307B

308B313

315

324325

323

321

309

305

320

308A

322

318

319

317

312

314

311

316310

307A

306

304303

302

301

0 500 1,000Feet

´

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LegendSurface Sediment and Surface Water Sample Location

Study Area

FIGURE 1Surface Sediment and Surface Water Sample Location

335

334

333

332

331

330

329

328

327

326

313315

324325

323

321

309

305

320

322

318319

317

312

314316310

307A 306

304303302

308B

307B308A

301

311

0 1,500 3,000Feet

´

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Study Area

FIGURE 2Proposed Surface Sedimentand Surface Water Sample

Reference Locations

335

334

333

332

331

330

329

328

327

326

0 1,000 2,000Feet

´

\\PERSEUS\PROJ\USARMYCORPSOFENGINEE\395863GOWANUS\GIS\MAPFILES\FIGURE_2A_PROPOSEDSURFSED_SW_LOCATIONS_ZOOMED_IN.MXD MARTESE 4/27/2010 17:10:30


FIGURE 2aProposed Surface Sedimentand Surface Water Sample

Reference Locations

18TH ST

3RD ST

1 ST

PRESIDENT ST

YCKOFF ST

CO

LUM

BIA

TOM

PKIN

S P

3RD

AVE

9TH ST

4TH

AVE

14TH ST

15TH ST

3RD ST

SMIT

H ST

CO

UR

T ST 2N

D AV

E

12TH ST

13TH ST

UNION ST

10TH ST11TH ST

5TH

AVE

7TH ST

8TH ST

HO

YT S

T

SACKETT ST

16TH ST

2ND ST

BOND

ST

1 PL

2 PL

19TH ST

4 PL

CLI

NTO

N S

T

3 PL

HEN

RY

ST DE GRAW ST

17TH ST

HIC

KS S

T

W 9TH ST

BALTIC ST

4TH ST

1ST ST

DOUGLASS ST

NEVI

NS S

T

LUQUER ST

BUTLER ST

LORRAINE ST

BAY ST

BUSH ST

PROSPECT AVE

NELSON ST

20TH ST

CENTRE ST

HUNTINGTON ST

CREAMER ST

GARNET ST

CARROLL ST

BRYANT ST

PRESIDENT ST

HAM

ILTO

N PL

SUMMIT ST

RAPELYE ST

WOODHULL ST

HALLECK ST

DEN

NET

T PL

COLES ST

4TH

AVE

HEN

RY S

T

CARROLL ST

2 ST

CARROLL ST

5TH ST

BAY ST

BUTLER ST

PRESIDENT ST

BQE

PRESIDENT ST

CARROLL ST

HAM

ILTON AVE

NELSON ST

PROSPECT EXPRESSWAY

CO

UR

T ST

CEN

TRE

MAL

L

CO

UR

T ST

6TH ST

HAMILTO

N AVE / G

OW

ANU

S EXPRESSWAY

9TH ST

5TH ST

UNION ST

W 9TH ST

0 500 1,000Feet

´

\\PERSEUS\PROJ\USARMYCORPSOFENGINEE\395863GOWANUS\GIS\MAPFILES\FIGURE3_PROPOSED_TISSUE_SAMPLING_AREAS.MXD FCAIN 4/27/2010 12:53:43

Legend

Canal Reach Boundary

Study Area

FIGURE 3Proposed Tissue Sampling Areas

406

405

404

403

402

401

406 Canal Reach ID

407

18TH ST

3RD ST

1 ST

PRESIDENT ST

WYCKOFF STC

OLU

MBI

A ST

TOM

PKIN

S P

L

3RD

AVE

9TH ST

4TH

AVE

14TH ST

15TH ST

3RD STSM

ITH

ST

CO

UR

T ST 2N

D AV

E

12TH ST

13TH ST

UNION ST

10TH ST11TH ST

5TH

AVE

7TH ST

8TH ST

HO

YT S

T

SACKETT ST

16TH ST

2ND ST

BOND

ST

1 PL

2 PL

19TH ST

4 PL

CLI

NTO

N S

T

3 PL

HEN

RY

ST DE GRAW ST

17TH ST

HIC

KS S

T

W 9TH ST

BALTIC ST

4TH ST

1ST ST

DOUGLASS ST

NEVI

NS S

T

LUQUER ST

BUTLER ST

LORRAINE ST

BAY ST

BUSH ST

PROSPECT AVE

NELSON ST

20TH ST

CENTRE ST

HUNTINGTON ST

CREAMER ST

GARNET ST

CARROLL ST

BRYANT ST

PRESIDENT ST

HAM

ILTO

N PL

SUMMIT ST

RAPELYE ST

WOODHULL ST

HALLECK ST

DEN

NET

T PL

COLES ST

4TH

AVE

HEN

RY S

T

CARROLL ST

2 ST

CARROLL ST

5TH ST

BAY ST

BUTLER ST

PRESIDENT ST

BQE

PRESIDENT ST

CARROLL ST

HAM

ILTON AVE

NELSON ST

PROSPECT EXPRESSWAY

CO

UR

T ST

CEN

TRE

MAL

L

CO

UR

T ST

6TH ST

HAMILTO

N AVE / G

OW

ANU

S EXPRESSW

AY

9TH ST

5TH ST

UNION ST

W 9TH ST

509

508

506505

504

503

502

501

507

513

512

511

510

0 500 1,000Feet

´

\\PERSEUS\PROJ\USARMYCORPSOFENGINEE\395863GOWANUS\GIS\MAPFILES\FIGURE4_PROPOSED_AIR_MONITORING_LOCATIONS.MXD FCAIN 4/27/2010 12:55:11

Legend

Proposed Air Monitoring Locations

Proposed Background Air Monitoring Locations

Study Area

Figure 4Proposed Air Monitoring Locations

18TH ST

3RD ST

1 ST

PRESIDENT ST

WYCKOFF ST

CO

LUM

BIA

ST

TOM

PKIN

S PL

3RD

AVE

9TH ST

4TH

AVE

14TH ST

15TH ST

3RD ST

SMIT

H ST

CO

UR

T ST 2N

D AV

E

12TH ST

13TH ST

UNION ST

10TH ST11TH ST

5TH

AVE

7TH ST

8TH ST

HOYT

ST

SACKETT ST

16TH ST

2ND ST

BON

D ST

1 PL

2 PL

19TH ST

4 PL

CLI

NTO

N S

T

3 PL

HE

NRY

ST DE GRAW ST

17TH ST

HIC

KS S

T

W 9TH ST

BALTIC ST

4TH ST

1ST ST

DOUGLASS ST

NEVI

NS

ST

LUQUER ST

BUTLER ST

LORRAINE ST

BAY ST

BUSH ST

PROSPECT AVE

NELSON ST

20TH ST

CENTRE ST

HUNTINGTON ST

CREAMER ST

GARNET ST

CARROLL ST

BRYANT ST

PRESIDENT ST

HAM

ILTON

PL

SUMMIT ST

RAPELYE ST

WOODHULL ST

HALLECK ST

DEN

NET

T PL

COLES ST

4TH

AVE

HEN

RY

ST

CARROLL ST

2 ST

CARROLL ST

5TH ST

BAY ST

BUTLER ST

PRESIDENT ST

BQE

PRESIDENT ST

CARROLL ST

HAMILTO

N AVE

NELSON ST

PROSPECT EXPRESSWAY

COU

RT

ST

CEN

TRE

MA

LL

CO

UR

T ST

6TH ST

HAMILTO

N AVE / G

OW

ANUS EXPRE

SSWAY

9TH ST

5TH ST

UNION ST

W 9TH ST

A

METROPOLITANFORMER MGP SITE

FULTON FORMERMGP SITECARROLL GARDENS/

PUBLIC PLACEFORMER CITIZENSGAS WORKS MGP SITE

USEEXISTING

WELLS

USEEXISTING

WELLS

USEEXISTING

WELLS

7

8

9

56

4

3

1

2

43

45

44

42

4140

39

38

37

36

35

34

2928

21

20

16

15

1918

17

1314

24

22

23

1112

10

2625

27

30

31

32

33

0 550 1,100Feet

´

\\PERSEUS\PROJ\USARMYCORPSOFENGINEE\395863GOWANUS\GIS\MAPFILES\FIGURE_5_PROPOSED_MONITORING_WELL_LOCATIONS.MXD MARTESE 5/4/2010 15:42:08

LegendProposed Well Pair Locationinstalled by NYCProposed Intermediate Well Location installed by National Grid (Supplements Existing Shallow Well)Proposed Well Pair Location installed by USEPA

Former MGP Site

City of NY Site

Con Edison 3rd Ave. Service Yard

Former U.S. Navy

Other Facilities

Figure 5Proposed Monitoring Well Locations

TA

L M

eta

ls +

Hg

Fil

tere

d T

AL

Met

als

+ H

g

Cyan

ide

TC

L V

OC

s

TC

L S

VO

Cs

TC

L P

CB

s

TC

L P

esti

cid

es

PC

B C

on

gen

ers

(4)

TO

C

Gra

in s

ize

AV

S/S

EM

TS

S

Geo

chem

istr

y

(3)

TO

-15

VO

Cs

TO

-13

A P

CB

s

TO

-14

LM

W-

PA

Hs

Bio

ass

ay

/

tox

icit

y

% m

ois

ture

Lip

id c

on

ten

t

Dry weather 37 37 37 37 37 37 37 37

Wet weather 37 37 37 37 37 37 37 37

Surface Sediment (1) No CSO discharges into canal 37 37 37 37 37 37 11 37 37 37

Sediment Toxicity

testing

No CSO discharges into canal 16

Mummichug 11 11 11 11 11

Blue crab 22 22 22 22 22 22

Striped bass 22 22 22 22 22

White perch 22 22 22 22 22

Subsurface soil (1) NA 80 80 80 80 80 80

Groundwater samples NA 81 81 81 81 81 81 81 16

Surface water During grundwater sampling event 5

CSO - sediment Dry weather 10 10 10 10 10 10 10 10

Dry weather event 10 10 10 10 10 10 10 10

Wet weather event 1 10 10 10 10 10 10 10 10



Air Samples Dry weather before start of aeration 23 1 23

Dry weather after start of aeration 23 1 23

(1) Sample volume will be archived for future analyses. (3) Includes TSS. Analyses through subcontracted laboratories, costs included.

(2) Number of samples do not include QA/QC samples. (4) SMO will subcontract directly for these analyses.

Table 1

Summary of Phase 3 Sampling Program

Gowanus Canal RI/FS

Brooklyn, New York

CSO - water

Media Sampling comments Number of Analyses Required (2)

Tissue Samples

Surface Water

Page 1 of 7

TA

L M

eta

ls +

Hg

TA

L M

eta

ls +

Hg

Filte

red

Cy

an

ide

TC

L V

OC

s

TC

L S

VO

Cs

TC

L P

CB

s

TC

L P

es

tic

ide

s

PC

B C

on

ge

ne

rs

TO

C

Gra

in s

ize

Arc

hiv

e

AV

S/S

EM

TS

S

Ge

oc

he

mis

try

pa

ram

ete

rs

TO

-15

VO

Cs

TO

-4A

PC

Bs

TO

-13

LM

W-

PA

Hs

Bio

as

sa

y /

tox

icit

y

% m

ois

ture

Lip

id c

on

ten

t

GC-SW301-0.5-DW

GC-SW301-0.5-WW

GC-SW302-0.5-DW

GC-SW302-0.5-WW

GC-SW303-0.5-DW

GC-SW303-0.5-WW

GC-SW304-0.5-DW

GC-SW304-0.5-WW

GC-SW305-0.5-DW

GC-SW305-0.5-WW

GC-SW306-0.5-DW

GC-SW306-0.5-WW

GC-SW307A-0.5-DW

GC-SW307A-0.5-WW

GC-SW307B-0.5-DW

GC-SW307B-0.5-WW

GC-SW308A-0.5-DW

GC-SW308A-0.5-WW

GC-SW308B-0.5-DW

GC-SW308B-0.5-WW

GC-SW309-0.5-DW

GC-SW309-0.5-WW

GC-SW310-0.5-DW

GC-SW310-0.5-WW

GC-SW311-0.5-DW

GC-SW311-0.5-WW

GC-SW312-0.5-DW

GC-SW312-0.5-WW

GC-SW313-0.5-DW

GC-SW313-0.5-WW

GC-SW314-0.5-DW

GC-SW314-0.5-WW

GC-SW315-0.5-DW

GC-SW315-0.5-WW

GC-SW316-0.5-DW

GC-SW316-0.5-WW

GC-SW317-0.5-DW

GC-SW317-0.5-WW

GC-SW318-0.5-DW

GC-SW318-0.5-WW

GC-SW319-0.5-DW

GC-SW319-0.5-WW

GC-SW320-0.5-DW

GC-SW320-0.5-WW

GC-SW321-0.5-DW

GC-SW321-0.5-WW

GC-SW322-0.5-DW

GC-SW322-0.5-WW

GC-SW323-0.5-DW

GC-SW323-0.5-WW

GC-SW324-0.5-DW

GC-SW324-0.5-WW

GC-SW325-0.5-DW

GC-SW325-0.5-WW

GC-SW326-0.5-DW

GC-SW326-0.5-WW

GC-SW327-0.5-DW

GC-SW327-0.5-WW

GC-SW328-0.5-DW

GC-SW328-0.5-WW

GC-SW329-0.5-DW

GC-SW329-0.5-WW

GC-SW330-0.5-DW

GC-SW330-0.5-WW

GC-SW331-0.5-DW

GC-SW331-0.5-WW

GC-SW332-0.5-DW

Rationale Analyses Required

Northing Easting

Surface Water (2

rounds)2

301 673636.97 634433.56 CSO (RH-034)

Table 2

Detailed Description of Phase 3 Sampling Program

Gowanus Canal RI/FS

Brooklyn, New York

Location Type Location ID Sample ID Coordinates 1 Description

302 673300.31 634273.62 CSO (RH-038) CSO; spatial coverage X X

XX XHead of canal; thick sediment mound from CSO

discharges; exposed sediment at low tide (note: area

targeted for dredging by NYCDEP for CSO abatement)

X X X X X

303 673198.13 634233.98 Former Fulton MGP site

XX X X X X

XX XNear former MGP site; high surface sediment PAH

concentrations for evaluation in BERA

X X X X X

305 672782.28 633995.68 Union St. bridge crossing

XX X X X X304 673070.09 634156.56 CSO (RH-037) CSO; spatial coverage X X

XX XHuman health exposure point X X X X X

307A 672302.69 633815.12 CSO (OH-005) and Carroll St. bridge crossing

XX X X X X306 672597.43 633915.40 CSO (RH-036) CSO; spatial coverage X X

XX XCSO; human health exposure point X X X X X

308A Based on

observations

Based on

observations

Canoe launch - north next to steps from exposed sediment

XX X X X X307B Based on

observations

Based on

observations

Pipe discharge in the canal, exposed sediment Human health exposure point X X


309 671562.74 633478.87 3rd

St. bridge crossing

XX X X X X308B Based on

observations

Based on

observations

Canoe launch - south section from exposed sediment Human health exposure point X X


311 671417.16 633287.31 CSO (OH-007)

XX X X X X310 671035.17 633836.47 4th

Street Basin Potential for exposed sediment at low tide X X

XX XCSO; spatial coverage X X X X X

313 671566.97 632297.41 Carroll Gardens/Public Place

XX X X X X312 671571.77 632886.87 CSO (RH-035) CSO; spatial coverage; Upstream of CG/PP former MGP

site

X X

XX XFormer MGP site X X X X X

315 671285.67 632011.79 Carroll Gardens/Public Place

XX X X X X314 671128.04 632928.61 6th

St. Basin Potential for exposed sediment at low tide X X

XX XFormer MGP site X X X X X

317 670951.79 631864.91 Storm sewer outfalls (RH-008 and RH-032) and 9th

St.

bridge crossing

XX X X X X316 670990.44 632450.87 7th

St. Basin Potential for exposed sediment at low tide X X

XX XCSO; human health exposure point X X X X X

319 670310.16 631481.48 Former Metro. MGP site

XX X X X X318 670344.18 631686.67 11th

St. Basin, former Metro. MGP site Former Metropolitan MGP site; Potential for exposed

sediment at low tide

X X

XX XFormer Metropolitan MGP site; High surface sediment

PAH concentrations for evaluation in BERA

X X X X X

321 669038.58 631033.49 Downstream of Gowanus Expressway

XX X X X X320 669869.83 631129.57 CSO (RH-031) and Hamilton Avenue crossing CSO; spatial coverage; Human health exposure point X X

XX XSpatial coverage of Gowanus Creek Channel X X X X X

323 668512.32 630633.28 CSO (OH-006)

XX X X X X322 668781.09 630852.22 Downstream of Gowanus Expressway Spatial coverage of Gowanus Creek Channel X X

XX XCSO; spatial coverage X X X X X

325 668818.18 630216.52 Downstream of Gowanus Expressway

XX X X X X324 668978.22 630523.81 Downstream of Gowanus Expressway Spatial coverage of Gowanus Creek Channel X X

XX XSpatial coverage of Gowanus Creek Channel X X X X X

327 667359.60 626903.80 Reference location

XX X X X X326 667743.80 628773.60 Reference location Surface sediment/surface water reference location

sutuated downstream from mouth of canal

X X

XX XSurface sediment/surface water reference location


X X X X X

329 665396.99 625264.11 Reference location

XX X X X X328 668675.58 625711.19 Reference location Surface sediment/surface water reference location


X X



X X X X X

331 670519.80 624165.04 Reference location (situated on mudflat)

XX X X X X330 667222.57 624612.12 Reference location (situated on mudflat) Surface sediment/surface water reference location


X X



X X X X X

XX X X X X332 664372.42 622376.71 Reference location (situated on mudflat) Surface sediment/surface water reference location


X X

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Surface Water (2 301 673636.97 634433.56 CSO (RH-034)


XX XHead of canal; thick sediment mound from CSO X X X X XGC-SW332-0.5-WW

GC-SW33-0.5-DW

GC-SW33-0.5-WW

GC-SW334-0.5-DW

GC-SW334-0.5-WW

GC-SW335-0.5-DW

GC-SW335-0.5-WW

301 GC-SD301-0.0-0.5 673636.97 634433.56 CSO (RH-034) Head of canal; thick sediment mound from CSO X X X X X X X X X X X

302 GC-SD302-0.0-0.5 673300.31 634273.62 CSO (RH-038) CSO; spatial coverage X X X X X X X X X X

303 GC-SD303-0.0-0.5 673198.13 634233.98 Former Fulton MGP site Near former MGP site; high surface sediment PAH X X X X X X X X X X X


305 GC-SD305-0.0-0.5 672782.28 633995.68 Union St. bridge crossing Human health exposure point X X X X X X X X X X X


307A GC-SD307A-0.0-0.5 672302.69 633815.12 CSO (OH-005) and Carroll St. bridge crossing CSO; human health exposure point X X X X X X X X X X X X

307B GC-SD307B-0.0-0.5 Based on

observations

Based on

observations

Pipe discharge in the canal, exposed sediment Human health exposure point X X X X X X X X X X X

308A GC-SD308A-0.0-0.5 Based on

observations

Based on

observations

Canoe launch - north next to steps from exposed sediment Human health exposure point X X X X X X X X X X X

308B GC-SD308B-0.0-0.5 Based on

observations

Based on

observations

Canoe launch - south section from exposed sediment Human health exposure point X X X X X X X X X X X

309 GC-SD309-0.0-0.5 671562.74 633478.87 3rd

St. bridge crossing Human health exposure point X X X X X X X X X X X

310 GC-SD310-0.0-0.5 670974.98 633786.69 4th

Street Basin Potential for exposed sediment at low tide X X X X X X X X X X X

311 GC-SD311-0.0-0.5 671417.16 633287.31 CSO (OH-007) CSO; spatial coverage X X X X X X X X X X

312 GC-SD312-0.0-0.5 671571.77 632886.87 CSO (RH-035) CSO; spatial coverage; Upstream of CG/PP former MGP X X X X X X X X X X X

313 GC-SD313-0.0-0.5 671566.97 632297.41 Carroll Gardens/Public Place Former MGP site X X X X X X X X X X X

314 GC-SD314-0.0-0.5 671128.04 632928.61 6th

St. Basin Potential for exposed sediment at low tide X X X X X X X X X X X

315 GC-SD315-0.0-0.5 671285.67 632011.79 Carroll Gardens/Public Place Former MGP site X X X X X X X X X X X

316 GC-SD316-0.0-0.5 670990.44 632450.87 7th

St. Basin Potential for exposed sediment at low tide X X X X X X X X X X

317 GC-SD317-0.0-0.5 670951.79 631864.91 Storm sewer outfalls (RH-008 and RH-032) and 9th

St. CSO; human health exposure point X X X X X X X X X X

318 GC-SD318-0.0-0.5 670344.18 631686.67 11th

St. Basin, former Metro. MGP site Former Metropolitan MGP site; Potential for exposed X X X X X X X X X X X

319 GC-SD319-0.0-0.5 670310.16 631481.48 Former Metro. MGP site Former Metropolitan MGP site; High surface sediment X X X X X X X X X X X

320 GC-SD320-0.0-0.5 669869.83 631129.57 CSO (RH-031) and Hamilton Avenue crossing CSO; spatial coverage; Human health exposure point X X X X X X X X X X X

321 GC-SD321-0.0-0.5 669038.58 631033.49 Downstream of Gowanus Expressway Spatial coverage of Gowanus Creek Channel X X X X X X X X X X X

322 GC-SD322-0.0-0.5 668781.09 630852.22 Downstream of Gowanus Expressway Spatial coverage of Gowanus Creek Channel X X X X X X X X X X

323 GC-SD323-0.0-0.5 668512.32 630633.28 CSO (OH-006) CSO; spatial coverage X X X X X X X X X X



326 GC-SD326-0.0-0.5 667743.80 628773.60 Reference location Surface sediment/surface water reference location X X X X X X X X X X X X

327 GC-SD327-0.0-0.5 667359.60 626903.80 Reference location Surface sediment/surface water reference location X X X X X X X X X X

328 GC-SD328-0.0-0.5 668675.58 625711.19 Reference location Surface sediment/surface water reference location X X X X X X X X X X X

329 GC-SD329-0.0-0.5 665396.99 625264.11 Reference location Surface sediment/surface water reference location X X X X X X X X X X X

330 GC-SD330-0.0-0.5 667222.57 624612.12 Reference location (situated on mudflat) Surface sediment/surface water reference location X X X X X X X X X X X X

331 GC-SD331-0.0-0.5 670519.80 624165.04 Reference location (situated on mudflat) Surface sediment/surface water reference location X X X X X X X X X X


333 GC-SD33-0.0-0.5 667166.68 622190.43 Reference location (situated on mudflat) Surface sediment/surface water reference location X X X X X X X X X X X X


335 GC-SD335-0.0-0.5 674375.88 623699.33 Reference location Surface sediment/surface water reference location X X X X X X X X X X

GC-TI401-MCG-WB 673676.865 634443.3842 X X X X X

672609.343 633907.1705

GC-TI402-MCG-WB 672609.343 633907.1705 X X X X X

671560.4708 633474.7483

GC-TI403-MCG-WB 671560.4708 633474.7483 X X X X X

671507.6577 632279.0675

GC-TI404-MCG-WB 671507.6577 632279.0675 X X X X X

670965.2733 631855.0662

GC-TI405-MCG-WB 670965.2733 631855.0662 X X X X X

669829.6991 631156.0336

GC-TI406-MCG-WB 669829.6991 631156.0336 X X X X X

668375.4678 630223.005

407A GC-TI407A-MCG-WB 667297.082 627629.919 Trap will be initally set at sediment location 326. Biological tissue reference location X X X X X

407B GC-TI407B-MCG-WB 668675.584 625711.194 Trap will be initally set at sediment location 328. Biological tissue reference location X X X X X

407C GC-TI407C-MCG-WB 665396.985 625264.112 Trap will be initally set at sediment location 329. Biological tissue reference location X X X X X

407D GC-TI407D-MCG-WB 667222.569 624612.118 Trap will be initally set at sediment location 330. Biological tissue reference location X X X X X

407E GC-TI407E-MCG-WB 667166.684 622190.425 Trap will be initally set at sediment location 333. Biological tissue reference location X X X X X

GC-TI401-BC-ED 673676.865 634443.3842 X X X X X X

333 667166.68 622190.43 Reference location (situated on mudflat)


334 662490.95 619805.99 Reference location (situated on mudflat) Surface sediment/surface water reference location


X X



X X X X X

Surface sediment/surface water reference location


X X X X X335 674375.88 623699.33 Reference location

XX X X X X

404 South of the turning basin between 5th and 6th Streets to

the 9th Street Bridge. This reach encompasses surface

water and sediment sampling stations 313-317.

Spatial coverage of Gowanus Canal

to

405 9th Street Bridge to Gowanus Expressway; this sampling

reach encompasses surface water and sediment sampling

locations 317-320.


to


to

403 3rd Street Bridge through and including the turning basin

between 5th and 6th Street. This reach also includes the

5th Street turning basin; the surface water and sediment

sampling locations encompassed in this reach include 309-


to

Surface

Sediment

Tissue Samples -

Mummichog3. 4

(Note a split for each

location for archiving)

401 Head of canal to President Street (half way between Union

and Carrol Street Bridges). This encompasses sediment

and surface water locations 301-306.


to

402 President Street to 3rd Street Bridge ; this reach

encompasses sediment and surface water locations 306-

309.

XX X

406 Downstream of Gowanus Expressway; this sampling reach

encompasses surface water and sediment sampling

locations 320-325.


to

Tissue Samples 3. 4 (Note




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XX XHead of canal; thick sediment mound from CSO X X X X XGC-TI402-BC-HP X X X X X X

672609.343 633907.1705

GC-TI402-BC-ED 672609.343 633907.1705 X X X X X X

GC-TI402-BC-HP X X X X X X

671560.4708 633474.7483

GC-TI403-BC-ED 671560.4708 633474.7483 X X X X X X


671507.6577 632279.0675

GC-TI404-BC-ED 671507.6577 632279.0675 X X X X X X


670965.2733 631855.0662

GC-TI405-BC-ED 670965.2733 631855.0662 X X X X X X


669829.6991 631156.0336

GC-TI406-BC-ED 669829.6991 631156.0336 X X X X X X


668375.4678 630223.005

GC-TI407A-BC-ED X X X X X X

GC-TI407A-BC-HP X X X X X X

GC-TI407B-BC-ED X X X X X X

GC-TI407B-BC-HP X X X X X X

GC-TI407C-BC-ED X X X X X X

GC-TI407C-BC-HP X X X X X X

GC-TI407D-BC-ED X X X X X X

GC-TI407D-BC-HP X X X X X X

GC-TI407E-BC-ED X X X X X X

GC-TI407E-BC-HP X X X X X X

GC-TI401-SB-ED 673676.865 634443.3842 X X X X X

GC-TI401-SB-WB X X X X X

672609.343 633907.1705

GC-TI402-SB-ED 672609.343 633907.1705 X X X X X


671560.4708 633474.7483

GC-TI403-SB-ED 671560.4708 633474.7483 X X X X X


671507.6577 632279.0675

GC-TI404-SB-ED 671507.6577 632279.0675 X X X X X


670965.2733 631855.0662

GC-TI405-SB-ED 670965.2733 631855.0662 X X X X X


669829.6991 631156.0336

GC-TI406-SB-ED 669829.6991 631156.0336 X X X X X


668375.4678 630223.005

GC-TI407A-SB-ED X X X X X

GC-TI407A-SB-WB X X X X X

GC-TI407B-SB-ED X X X X X

GC-TI407B-SB-WB X X X X X

GC-TI407C-SB-ED X X X X X

GC-TI407C-SB-WB X X X X X

GC-TI407D-SB-ED X X X X X

GC-TI407D-SB-WB X X X XX X

GC-TI407E-SB-ED X X X X X

GC-TI407E-SB-WB X X X X X

GC-TI401-WP-ED 673676.865 634443.3842 X X X X X

GC-TI401-WP-WB X X X X X

672609.343 633907.1705

GC-TI402-WP-ED 672609.343 633907.1705 X X X X X


671560.4708 633474.7483

GC-TI403-WP-ED 671560.4708 633474.7483 X X X X X


671507.6577 632279.0675

GC-TI404-WP-ED 671507.6577 632279.0675 X X X X X


670965.2733 631855.0662

GC-TI405-WP-ED 670965.2733 631855.0662 X X X X X


669829.6991 631156.0336

President Street to 3rd Street Bridge ; this reach


309.


to






to

Blue Crab3. 4 (Note

a split for each location

for archiving)


and surface water locations 301-306.to

402



locations 320-325.


to

407A 667297.082 627629.919 Trap will be initally set at sediment location 326. Biological tissue reference location





to



locations 317-320.


to

407D 667222.569 624612.118 Trap will be initally set at sediment location 330. Biological tissue reference location

407E 667166.684 622190.425 Trap will be initally set at sediment location 333. Biological tissue reference location

407B 668675.584 625711.194 Trap will be initally set at sediment location 328. Biological tissue reference location

407C 665396.985 625264.112 Trap will be initally set at sediment location 329. Biological tissue reference location



locations 317-320.


to



locations 320-325.


to

3rd Street Bridge through and including the turning basin





to





to

Tissue Samples

Striped Bass3. 4







to



309.


to

403

407C NA NA Fishing will occur in the area where the surface water and

sediment locations were selected

Biological tissue reference location

407D NA NA Fishing will occur in the area where the surface water and



407A NA NA Fishing will occur in the area where the surface water and



407B NA NA Fishing will occur in the area where the surface water and





309.


to





314)


to

407E NA NA Fishing will occur in the area where the surface water and



Tissue Samples

White Perch3. 4







to





to



locations 317-320.


to

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XX XHead of canal; thick sediment mound from CSO X X X X XGC-TI406-WP-ED 669829.6991 631156.0336 X X X X X


668375.4678 630223.005

GC-TI407-WP-ED X X X X X


GC-TI407B-WP-ED X X X X X

GC-TI407B-WP-WB X X X X X

GC-TI407C-WP-ED X X X X X

GC-TI407C-WP-WB X X X X X

GC-TI407D-WP-ED X X X X X

GC-TI407D-WP-WB X X X X X

GC-TI407E-WP-ED X X X X X

GC-TI407E-WP-WB X X X X X

MW-1 GC-MW1S

GC-MW1I

MW-2 GC-MW2S

GC-MW2I

MW-3 GC-MW3S

GC-MW3I

MW-4 GC-MW4S

GC-MW4I

MW-5 GC-MW5S

GC-MW5I

MW-6 GC-MW6S

GC-MW6I

MW-7 GC-MW7S

GC-MW7I

MW-8 GC-MW8S

GC-MW8I

MW-9 GC-MW9S

GC-MW9I

MW-10 GC-MW10S

GC-MW10I

MW-11 GC-MW11S

GC-MW11I

MW-12 GC-MW12S

GC-MW12I

MW-13 GC-MW13S

GC-MW13I

MW-14 GC-MW14S

GC-MW14I

MW-15 GC-MW15S

GC-MW15I

MW-16 GC-MW16S

GC-MW16I

MW-17 GC-MW17S

GC-MW17I

MW-18 GC-MW18S

GC-MW18I

MW-19 GC-MW19S

GC-MW19I

MW-20 GC-MW20S

GC-MW20I

MW-21 GC-MW21S

GC-MW21I

MW-22 GC-MW22S

GC-MW22I

MW-23 GC-MW23S

GC-MW23I

MW-24 GC-MW24S

GC-MW24I

MW-25 GC-MW25S

GC-MW25I

MW-26 GC-MW26S

GC-MW26I

MW-27 GC-MW27S

GC-MW27I

MW-28 GC-MW28S

GC-MW28I

MW-29 GC-MW29S

GC-MW29I

MW-30 GC-MW30I Monitoring well - shallow and intermediate. Assess groundwater conncetion to the canal. X X X X X X X



locations 320-325.


to

407A NA NA Fishin will occur in the area where the surface water and



407D NA NA Fishin will occur in the area where the surface water and



407E NA NA Fishin will occur in the area where the surface water and



407B NA NA Fishin will occur in the area where the surface water and



407C NA NA Fishin will occur in the area where the surface water and



Monitoring well - shallow and intermediate. Assess groundwater conncetion to the canal. X X

X X X X XMonitoring well - shallow and intermediate. Assess groundwater conncetion to the canal. X X

XX X X X X


XX X X X XMonitoring well - shallow and intermediate. Assess groundwater conncetion to the canal. X X

XX X X X X



X X X X X



X X X X X



X X X X X



XX X X X X



X X X X X



XX X X X X



XX X X X X



X X X X X



X X X X X



X X X X X



X X X X X



X X X X X


Ground Water

(66 wells will be

sampled for TCL

& TAL and 8

pairs or 16 wells

will be sampled

for geochemistry

parameters as

part of this Work

Plan)

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XX XHead of canal; thick sediment mound from CSO X X X X XMW-31 GC-MW31I Monitoring well - shallow and intermediate. Assess groundwater conncetion to the canal. X X X X X X X X

MW-32 GC-MW32I Monitoring well - shallow and intermediate. Assess groundwater conncetion to the canal. X X X X X X X

MW-33 GC-MW33S

GC-MW33I

MW-34 GC-MW34S

GC-MW34I

MW-35 GC-MW35S

GC-MW35I

MW-36 GC-MW36S

GC-MW36I

MW-37 GC-MW37S

GC-MW37I

MW-38 GC-MW38S

GC-MW38I

MW-39 GC-MW39S

GC-MW39I

MW-40 GC-MW40S

GC-MW40I

MW-41 GC-MW41S

GC-MW41I

MW-42 GC-MW42S

GC-MW42I

MW-2 GC-SWMW2 Water in the canal along bulkhead by identified well Groundwater / surface water interractions X









GC-SBMW??I-0-5 Soil boring installed for the purpose of installing Assess soil conditions at locations X X X X X X X




GC-SBMW??I-20-25 Soil boring installed for the purpose of installing

intermediate well

Assess soil conditions at locations X X X X X X X


GC-SBMW??I-30-35 Soil boring installed for the purpose of installing

intermediate well

Assess soil conditions at locations X X X X X X X




GC-SWRH031-DW-1 CSO discharge

GC-SWRH031-WW-1

through 3


GC-SWRH0034-WW-1

through 3


GC-SWRH033-WW-1

through 3


GC-SWRH035-WW-1

through 3


GC-SWRH037-WW-1

through 3


GC-SWRH036-WW-1

through 3


GC-SWRH038-WW-1

through 3

GC-SW0H005-DW-1 CSO discharge

GC-SWOH005-WW-1

through 3


GC-SWOH006-WW-1

through 3


Monitoring well - shallow and intermediate. Assess groundwater conncetion to the canal. X X X X X X X



X X X X X



XX X X X X



XX X X X X




X X X X X

Subsurface soil MW-?

Locations to be

determined

CSO Surface

water samples 1

dry and 3 wet

rounds)

RH-031

Surface water for

geochemistry

evaluation (5

locations to be

sampled as part

of this Work

Plan)

X X X X X

RH-0034

XX X XCSO X X X X

RH-033 CSO

XX X X X XCSO X X

RH-035 CSO X X X X

XXX X X X X X

XX X X X XRH-037 CSO X X

XX X X

X X X X X XRH-036 CSO

XX X X

XX X X X X

RH-038 CSO X X X X

XX

OH-005 CSO X X

XXX X X X X XOH-006 CSO

XX X XOH-007 CSO X X X X

Page 6 of 7

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XX XHead of canal; thick sediment mound from CSO X X X X XGC-SWOH007-WW-1

through 3

RH-031 GC-SDRH031 CSO CSO discharge X X X X X X X X







OH-005 GC-SDRH005 CSO CSO discharge X X X X X X X X

OH-006 GC-SD0H006 CSO CSO discharge X X X X X X X X

OH-007 GC-SD0H007 CSO CSO discharge X X X X X X X X

501 GC-AS501-C East side of canal at DeGraw Street-canoe level Measure breathing zone for boaters within canal; spatial X X

501 GC-AS501-S East side of canal at DeGraw Street-street level Measure breathing zone at street level; spatial coverage X X

502 GC-AS502-C West side of canal at Union Street Bridge-canoe level Measure breathing zone for boaters within canal; spatial X X

502 GC-AS502-S West side of canal at Union Street Bridge-street level Measure breathing zone at street level; spatial coverage X X

503 GC-AS503-C East side of canal at Carroll Street Bridge-canoe level Measure breathing zone for boaters within canal; spatial X X

503 GC-AS503-S East side of canal at Carroll Street Bridge-street level Measure breathing zone at street level; spatial coverage X X

504 GC-AS504-C 2nd street, at canoe launch and in front of property planned Measure breathing zone for boaters within canal; spatial X X

504 GC-AS504-S 2nd street, at canoe launch and in front of property planned Measure breathing zone at street level; spatial coverage X X

505 GC-AS505-C East side of canal at 3rd Street Bridge-canoe level Measure breathing zone for boaters within canal; spatial X X

505 GC-AS505-S East side of canal at 3rd Street Bridge-street level Measure breathing zone at street level; spatial coverage X X

506 GC-AS506-C West side of canal between 4th and 5th street-canoe level Measure breathing zone for boaters within canal; spatial X X

506 GC-AS506-S West side of canal between 4th and 5th street-street level Measure breathing zone at street level; spatial coverage X X X

507 GC-AS507-C West of the canal on Huntington Street Measure breathing zone for boaters within canal; spatial X X

507 GC-AS507-S West of the canal on Huntington Street Measure breathing zone at street level; spatial coverage X X

508 GC-AS508-C East side of canal north of 11th Street turning basin-canoe Measure breathing zone for boaters within canal; spatial X X

508 GC-AS508-S East side of canal north of 11th Street turning basin-street Measure breathing zone at street level; spatial coverage X X

509 GC-AS509-C East side of canal north of Gowanus Expressway-canoe Measure breathing zone for boaters within canal; spatial X X

509 GC-AS509-S East side of canal north of Gowanus Expressway-street Measure breathing zone at street level; spatial coverage X X

510 GC-AS510-C West side of canal south of Gowanus Expressway-canoe Measure breathing zone for boaters within canal; spatial X X

510 GC-AS510-S West side of canal south of Gowanus Expressway-street Measure breathing zone at street level; spatial coverage X X

511 GC-AS511-S Intersection of Carroll and Hoyt Streets-street level Air reference location 1 X X

512 GC-AS511-S Near intersection Baltic and Hoyt Street-street level Air reference location 2 X X

513 GC-AS513-S TBD Air reference location 3 X X

Notes:1 New York State Plane East Zone NAD83

2 Surface water will be collected during wet (-W) and dry (-D) events

4 Coordinates for tissue sample reaches are from the mid-point of the canal on from the upper and lower extent of the reaches.

Legend:

Bioacc Bioaccumulative

TAL Target Analyte List

TCL Target Compound List includes:

volatile organic compounds, semi-volatile organic compounds, pesticides, and PCBs

VOC Volatile Organic Compound

SVOC Semi-Volatile Organic Compound

PEST Pesticides

PCB Polychlorinated biphenyls

TSS Total suspended solids

Hg Mercury

TOC Total organic carbon

AVS/SEM Acid volatile sulfide/simultaneously extracted metals

The composites consist of edible protion (-ED), whole body (-WB), and a composite of edible meat and the hepatopancreas (- HP, for blue crab only).

Geochemistry parameters include: Alkalinity, Ammonia, Calcium, Chlorides, Iron – Total, Iron – Dissolved, Magnesium, Manganese – Total, Manganese –

Dissolved, Aluminum, Nitrates, TKN, Organic Carbon – dissolved, Organic Carbon – Total, Potassium, Phosphate, Total Hardness, Silica, Sodium, Sulfates, Total

Dissolved solids (TDS), and Total Dissolved Solids (TSS).

CSO Sediment

samples

Air Samples (2

rounds)

3 Tissue samples are identified by the reach ID, species and composite type. Species as follows: mummichog (MCG), striped bass (SB), white perch (WP), and blue crab (BC).

Page 7 of 7

Table 3

Phase 3 - Monitoring Well Installation - Approximate screen depths for intermediate monitoring wells

Gowanus Canal RI/FS, Brooklyn, NY

Monitoring

Well

Location ID

Ground Surface

Elevation at

Monitoring Well

Location (NAVD88

- ft) 1

Closest EPA

Sediment Core

to MW w/

Native Material

Top of Soft

Sediment

Elevation

(NAVD88 - ft) 2

Total Core

Penetration (ft)

Native

Material

Present in

Core (ft)

Top of Native

Sediment

Elevation

(NAVD88 - ft) 3

Target Elevation

Top of Screen @

5' Below Native

(NAVD88-ft)

Target Depth

for Top of

Screen (ft bgs)

GC-MW-1I 10.4 2A -2.4 19 2.0 -19.4 -24.4 34.8

GC-MW-2I 6.6 2A -2.4 19 2.0 -19.4 -24.4 31.0

GC-MW-3I 11.7 14A -7.5 20 6.5 -21.0 -26.0 37.7

GC-MW-4I 9.8 147 -12 20 13.5 -18.5 -23.5 33.3

GC-MW-5I 6.8 147 -12 20 13.5 -18.5 -23.5 30.3

GC-MW-6I 7.0 147 -12 20 13.5 -18.5 -23.5 30.5

GC-MW-7I 7.8 26A -12.9 20 12.3 -20.6 -25.6 33.4

GC-MW-8I 8.3 26A -12.9 20 12.3 -20.6 -25.6 33.9

GC-MW-9I 10.0 131 -15.6 13.9 10.4 -19.1 -24.1 34.1

GC-MW-10I 14.7 115 -13.3 19 12.0 -20.3 -25.3 40.0

GC-MW-11I 9.3 59A -16.8 18.4 10.9 -24.3 -29.3 38.6

GC-MW-12I 9.6 59A -16.8 18.4 10.9 -24.3 -29.3 38.9

GC-MW-13I 6.2 74E -30.2 16 6.8 -39.4 -44.4 50.6

GC-MW-14I 6.2 74E -30.2 16 6.8 -39.4 -44.4 50.6

GC-MW-15I 6.9 143 -34.7 19 10.5 -43.2 -48.2 55.1

GC-MW-16I 6.7 140 -30.9 18.9 7.3 -42.5 -47.5 54.2

GC-MW-17I 8.6 122 -22.9 18.2 15.0 -26.1 -31.1 39.7

GC-MW-18I 8.3 74E -30.2 16 6.8 -39.4 -44.4 52.7

GC-MW-19I 11.6 74E -30.2 16 6.8 -39.4 -44.4 56.0

GC-MW-20I 8.9 115 -13.3 19 12.0 -20.3 -25.3 34.2

GC-MW-21I 7.5 115 -13.3 19 12.0 -20.3 -25.3 32.8

GC-MW-22I 8.0 45C -16.9 8.8 3.2 -22.5 -27.5 35.5

GC-MW-23I 6.7 45C -16.9 8.8 3.2 -22.5 -27.5 34.2

GC-MW-24I 7.3 45C -16.9 8.8 3.2 -22.5 -27.5 34.8

GC-MW-25I 17.1 110 -9 20 8.2 -20.8 -25.8 42.9

GC-MW-26I 15.4 147 -12 20 13.5 -18.5 -23.5 38.9

GC-MW-27I 11.5 147 -12 20 13.5 -18.5 -23.5 35.0

GC-MW-28I 8.1 153 -11 14.2 6.6 -18.6 -23.6 31.7

GC-MW-29I 8.6 153 -11 14.2 6.6 -18.6 -23.6 32.2

GC-MW-30I 8.3 8A -3.6 20 5.0 -18.6 -23.6 31.9

GC-MW-31I 7.3 152 -3.5 18.7 4.3 -17.9 -22.9 30.2

GC-MW-32I 17.6 152 -3.5 18.7 4.3 -17.9 -22.9 40.5

GC-MW-33I 8.9 2A -2.4 19 2.0 -19.4 -24.4 33.3

GC-MW-34I 6.1 152 -3.5 18.7 4.3 -17.9 -22.9 29.0

GC-MW-35I 8.8 109 -9.9 13 6.5 -16.4 -21.4 30.2

GC-MW-36I 7.9 145 -14.1 12.4 5.8 -20.7 -25.7 33.6

GC-MW-37I 8.2 111 -4.5 18 7.6 -14.9 -19.9 28.1

GC-MW-38I 13.8 111 -4.5 18 7.6 -14.9 -19.9 33.7

GC-MW-39I 18.2 111 -4.5 18 7.6 -14.9 -19.9 38.1

GC-MW-40I 6.7 77A -28.1 20 6.5 -41.6 -46.6 53.3

GC-MW-41I 6.7 77A -28.1 20 6.5 -41.6 -46.6 53.3

GC-MW-42I 7.3 115 -13.3 19 12.0 -20.3 -25.3 32.6

GC-MW-43I 6.8 145 -14.1 12.4 5.8 -20.7 -25.7 32.5

GC-MW-44I 6.9 62C -15.8 20 8.2 -27.6 -32.6 39.5

GC-MW-45I 6.6 59A -16.8 18.4 10.9 -24.3 -29.3 35.91 -Surface ground elevations extrapolated from data received from the Department of Information Technology and Telecommunication,

City of New York, April 20062 - Elevation data for top of soft sediment were collected by Aqua Survey Inc. during the Phase 2 RI conducted in March/April of 2010

3 - Top of native sediment calculated by determining the amount of native material present in relation to the total core penetration .

This compensates for the loss of some overlying soft sediment during retrieval of the core.

draft final gowanus canal superfund site brooklyn, new

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