Open-File Report 2006-1374
U.S. GEOLOGICAL SURVEY
Open-File Report 2006-1374
Quality assurance and control of geochemical sampling included collecting duplicate samples for selected redox-sensitive analytes and volatile organic compounds (VOCs) and analyzing a field blank sample for VOCs. Field blanks were collected by pumping VOC-free water through previously used and cleaned tubing to determine possible sampling contamination in samples collected at known contaminated wells only; new tubing was used to sample from wells that were known to be uncontaminated or slightly contaminated, and from piezometers sampled for the first time. Complete laboratory quality assurance and control data from Severn-Trent Laboratories is on file in the USGS office in Tacoma, Washington.
Duplicate sample results compared favorably for all constituents (table A1). A duplicate sample was collected and analyzed for organic carbon, manganese, sulfate, and chloride for piezometers P1-9 and P1-3. The duplicate results for those constituents agreed within 16 percent. A duplicate sample was collected and analyzed for piezometers P1-3 and P1-9 and the CVOC concentrations agreed within 10 percent (table 3).
Chloroethenes, chloroethanes, and benzene, toluene, ethylbenze, and xylene (BTEX) were not detected in the field blank sample of pumped VOC-free water (site P1-9FB). No ethene, ethane, or chloroethene or choroethane compounds of interest were detected in laboratory method.
Table A1. Quality assurance data collected by the U.S. Geological Survey at Operable Unit 1, Naval Undersea Warfare Center, Division Keyport, Washington.
[Study site No.: D denotes duplicate sample; FB denotes field blank sample. Volatile organic compounds (VOCs): PCE, tetrachloroethene; TCE, trichloroethene; cis-DCE, cis-1,2-dichloroethene; trans-DCE, trans-1,2-dichloroethene; VC, vinyl chloride; TCA, 1,1-trichloroethane; 1,1-DCA, 1,1-dichloroethane, CA, chloroethane; BTEX, benzene, toluene, ethylbezene, and xylene; CVOCs, sum of all chloroethenes and chloroethane concentrations shown in table. Abbreviations: E, estimated value; mg/L, milligrams per liter; mg/L, micrograms per liter; nd, not detected. Symbols: <, actual value is less than the value shown; –, not analyzed]
| Study site No. | Date sampled | PCE(µg/L) | TCE(µg/L) | cis-DCE(µg/L) | trans-DCE(µg/L) | VC(µg/L) | Ethane(µg/L) | Ethene(µg/L) | TCA(µg/L) | 1,1-DCA (µg/L) | CA (µg/L) | 1,1-DCE (µg/L) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P1-3 | 06-22-05 | <1.0 | <1.0 | 11 | 1.3 | 35 | 44 | 30 | <1.0 | 0.31 | 2.6 | <1.0 |
| P1-3D | 06-22-05 | <1.0 | <1.0 | 9.9 | 1.2 | 33 | 38 | 27 | <1.0 | .34 | 2.7 | <1.0 |
| P1-9 | 06-23-05 | <20 | 230 | 700 | E3.2 | 97 | <5 | 4 | <20 | <20 | <40 | <20 |
| P1-9D | 06-23-05 | <20 | 210 | 640 | 3.1 | 90 | <5 | 3.7 | <20 | <20 | <40 | <20 |
| P1-9FB | 06-23-05 | <1.0 | <1.0 | <1.0 | <1.0 | <1.0 | <5 | <5 | <1.0 | <1.0 | <2.0 | <1.0 |
| Study site No. | Date sampled | Total | Dissolved oxygen(mg/L) | Filtered NO2 + NO3(mg/L) | Filtered (dissolved)organic carbon(mg/L) | Filtered manga-nese (mg/L) | Filtered iron (II)(mg/L) | Filtered sulfate(mg/L) | Unfiltered sulfide(mg/L) | Dissolved methane (mg/L) | Dissolved carbon dioxide (mg/L) | Filtered chloride (mg/L) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BTEX(µg/L) | CVOCs(µg/L) | ||||||||||||
| P1-3 | 06-22-05 | 23 | 65 | <0.1 | – | 20 | 2.8 | – | 0.38 | 0.03 | 8.4 | 320 | 68 |
| P1-3D | 06-22-05 | 23 | 61 | <.1 | – | 20 | 2.8 | – | .37 | .03 | – | – | 68 |
| P1-9 | 06-23-05 | nd | 1,000 | <.1 | – | 1.4 | .11 | 0.01 | 8.7 | <.01 | .02 | <10 | 12 |
| P1-9D | 06-23-05 | nd | 940 | <.1 | – | 1.0 | .13 | – | 8.5 | <.01 | .02 | <10 | 18 |
| P1-9FB | 06-23-05 | nd | nd | – | <0.06 | – | <.006 | – | <.2 | – | <5 | – | <.20 |
U.S.
Department of the Interior | U.S. Geological
Survey
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