Amendment 0004_CoreSamp_Enclosure 1-2 Troy dock.pdf
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- Solicitation number
- W912DS26BA008
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This document is a technical enclosure package containing environmental sampling data and location information for a dredging project at Troy Lock & Dam on the Hudson River in New York.
Enclosure 1 provides location maps of the proposed dredging area, showing the geographic position along the Hudson River corridor using both aerial imagery and a schematic representation of the waterway. Enclosure 2 identifies four sample collection locations (A, B, C, and D) with corresponding DGPS coordinates in State Plane NAD 83 New York-East US Survey Foot coordinate system. Grain size distribution analysis shows samples ranging from sandy-silty compositions (Sample B with 62.4% silt) to gravel-sand dominant materials (Sample D with 51.9% sand and 3.3% gravel). Moisture content varies from 40.70% to 50.56%, with Total Organic Carbon (TOC) ranging from 1.65% to 4.60% of dry weight. Enclosure 3 presents comprehensive chemical analysis of composite samples in mg/kg units, including volatile organic compounds (benzene, toluene, xylenes), polycyclic aromatic hydrocarbons (naphthalene through benzo(ghi)perylene), pesticides (dieldrin, DDT compounds, chlordane), polychlorinated biphenyls (Aroclor congeners totaling 0.85 to 20 mg/kg), heavy metals (arsenic 3.8–5.9 mg/kg, cadmium 0.58–18 mg/kg, lead 34–230 mg/kg, mercury 0.16–2.3 mg/kg), and dioxin toxic equivalents. Sample identification numbers are cross-referenced with amended ID numbers for compositing and quality assurance purposes, including duplicate and triplicate analyses of Sample D.
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Dredging Area
ENCLOSURE 1
LOCATION MAP OF
PROPOSED DREDGING
AREA
(Not to Scale)
Figure 1. Sample Locations Map
Enclosure 2 (Sheet 1 of 2) Troy Lock Dreding Area Sample Locations
Hudson River, NY
Table 1. DGPS Coordinates
Core Name Northings Eastings
A 1428847.0 711024.3
B 1428942.2 711099.8
C 1429095.6 711155.8
D 1429257.8 711206.1
Table 2. Sample Identification and Compositing Scheme
Core Name ASI ID # Amended ID
A 20250716 Amended A 20250720
B 20250717 Amended B 20250721
C 20250718 Amended C 20250722
D 20250719 Amended D 20250723
Table 3. Grain Size Distribution, Percent Moisture & TOC
Sample ID ASI # Total % Gravel
Total % Sand
Total % Silt
Total % Clay
Moisture
TOC
ppm
% TOC
of Dry Weight
A 20250716 1.1 42.8 42.8 13.3 44.15 22,998 2.30
B 20250717 0.6 20.7 62.4 16.3 50.56 46,029 4.60
C 20250718 2.5 33.8 50.1 13.6 45.77 23,338 2.33
D 20250719 3.3 51.9 35.0 9.8 40.70 16,457 1.65
D 20250719 dup 3.3 51.8 34.7 10.2 40.41
D 20250719 trp 3.4 52.0 34.3 10.3 41.82
Enclosure 2 (Sheet 2 of 2) Troy Lock & Dam Dredging Area Sample Locations Hudson River, NY
Troy, NY Dredging Area mg/kg
ASI ID
Composite ID COMP A Q COMP B Q COMP C Q COMP D Q
Analyte Concentration Q Concentration Q Concentration Q Concentration Q
Benzene 0.00086 U 0.00097 U 0.00095 U 0.001 U
Toluene 0.00035 U 0.01 0.0021 0.00041 UF1
Xylenes(Total) 0.00026 U 0.0008 JB 0.00033 JB 0.00031 UF1
Total BTX 0.000735 0.011285 0.002905 0.00086
Naphthalene 0.063 0.0083 0.0042 J 0.004 J
Acenaphthylene 0.0079 0.0098 0.015 0.0092
Acenaphthene 0.046 0.0019 U 0.0036 J 0.0041 J
Fluorene 0.047 0.0092 0.0071 0.0059
Phenanthrene 0.28 0.049 0.068 0.055
Anthracene 0.043 0.013 0.018 0.019
Fluoranthene 0.61 0.086 0.14 0.15
Pyrene 0.42 0.086 0.12 0.11
Benzo(a)anthracene 0.2 0.044 0.063 0.066
Chrysene 0.2 0.048 0.063 0.069
Benzo(b)fluoranthene 0.2 0.066 0.085 0.094
Benzo(k)fluoranthene 0.063 0.02 0.033 0.03
Benzo(a)pyrene 0.1 0.037 0.057 0.058
Indeno(1,2,3-cd)pyrene 0.057 0.026 0.039 0.04
Dibenzo(a,h)anthracene 0.02 0.009 0.013 0.013
Benzo(ghi)perylene 0.071 0.033 0.047 0.05
Total PAH 2.4279 0.54525 0.7759 0.7772
Dieldrin 0.019 U 0.000021 U 0.0002 U 0.000018 UF1F2
4,4'-DDE 0.015 U 0.000017 U 0.00017 U 0.000015 U
4,4'-DDD 0.016 U 0.000017 U 0.00017 U 0.000043 Jp
4,4'-DDT 0.053 U 0.000059 U 0.0011 p 0.000052 U
DDT+DDD+DDE 0.0685 U 0.0000465 U 0.00127 0.0000765
Chlordane 0.018 U 0.00002 U 0.000195 U 0.0000175 UF1F2
Mirex 0.054 U 0.00006 U 0.00059 U 0.000053 U
Aroclor-1016 0.0024 U 0.027 U 0.0027 U 0.00024 UF1
Aroclor-1221 0.0026 U 11 1.9 0.00026 U
Aroclor-1232 0.0018 U 0.02 U 0.002 U 0.00018 U
Aroclor-1242 0.8 8.6 1.1 0.2
Aroclor-1248 0.0018 U 0.02 U 0.002 U 0.00018 U
Aroclor-1254 0.0022 U 0.025 U 0.0025 U 0.2
Aroclor-1260 0.045 0.37 0.083 0.00021 U
Total PCB 0.85 20 3.1 0.4
Arsenic 4.2 5.9 4.8 3.8
Cadmium 1 18 3.9 0.58
Copper 30 71 41 28
Lead 39 230 78 34
Mercury 0.16 2.3 0.65 0.34 F2F1
Dioxin (Toxic Equiv Total) 0.000011061 0.00007441 0.00004351 0.000007891
Totals:
2) If a concentration of a specific contaminant is reported as 'non-detect' or less than, and the method detection limit was not achieved, then the detection limit is used as an estimate of the maximum possible concentration.
3) If a concentration of a specific contaminant is reported as 'non-detect' or less than, and the detection limit achieved was at or below the method detection limit, then half the achieved detection limit is used as an estimate of the concentration.
4) Chlordane = sum of alpha and gamma chlordane
#20250716 #20250717 #20250718 #20250419
1) include estimated values, those reported with a J qualifier
Enclosure 3 (Sheet 1 of 1) Troy Lock & Dam Dredging Area Sample Locations Hudson River, NY
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