Selected natural attenuation monitoring data, Operable Unit 1, Naval Undersea Warfare Center, Division Keyport, Washington, June 2002

Abstract

the 2005-06 increase in concentrations are unknown. At piezometer P1-10, the consistent temporal trend of decreasing chlorinated VOC concentrations measured since 1999 ended, and the concentration of total chlorinated VOC in 2006 was the highest measured since 1999. The reductive dechlorination end-product ethene was measured at concentrations as high as 1,300 micrograms per liter in the upper aquifer beneath the southern plantation, which is reliable evidence that reductive dechlorination of VOCs is ongoing.

Groundwater geochemical and selected volatile organic compound data, Operable Unit 1, Naval Undersea Warfare Center, Division Keyport, Washington, June 2011

“…Geochemical data collected by the USGS from piezometers and selected wells at OU 1 from 1996 to 2011 are shown in table 2. Historical geochemical data for wells not sampled in 2011 are not included in table 2, but are available in Dinicola (2003Dinicola ( , 2004Dinicola ( , 2006) and Dinicola and Huffman (2004, 2006, 2009, 2012. Overall, concentrations of oxidation-reduction (redox) sensitive constituents measured in 2011 were consistent with previous years, with dissolvedoxygen concentrations all at 0.4 mg/L or less; little to no detectable nitrate; abundant dissolved manganese, iron, and methane; and commonly detected sulfide.…”

“…Historical VOC data for wells not sampled in 2011 and for dates before 1999 are not included in table 3. Complete analytical results for the USGS data for 2011 and previous years are available from the USGS National Water Information System web site (U.S. Geological Survey, 2012; or Dinicola and others (2002), Dinicola (2003Dinicola ( , 2004Dinicola ( , 2006, Dinicola and Huffman (2004, 2006, 2009, 2012, and Huffman and Dinicola (2011). Complete analytical results for the complimentary U.S. Navy VOC data from 1995 through 2011 are available in U.S. Navy (2012).…”

“…No. [All other data were published in Dinicola and others (2002), Dinicola (2003Dinicola ( , 2004Dinicola ( , 2006, Dinicola and Huffman (2004, 2006, 2009, and Dinicola and Huffman (2011); prior to 2000, bicarbonate was calculated from an unfiltered sample. Reported concentrations less than the detection limit usually are estimated.…”

“…Abbreviations: nM, nanomolar; mg/L, milligram per liter; µS/cm, microsiemens per centimeter at 25 degrees Celsius; ORP, oxidation-reduction potential; mV, millivolt. Symbols: E, estimated value; R, data rejected (selected 1996 dissolved-oxygen data were rejected because of inadequate well purging; selected 2002 dissolved-hydrogen data were rejected because of interference from downhole instruments, 2011, dissolved-hydrogen data were rejected pending further investigation between U.S. Geological Survey field analysis and analyzing laboratory); <, actual value is less than value shown; >, actual value is greater than value shown; -, not analyzed] Division Keyport, Washington, 1999-2011 [All data except those shaded were published previously in Dinicola and others (2002), Dinicola (2003Dinicola ( , 2004Dinicola ( , 2006, Dinicola and Huffman (2004, 2006, 2009, and Dinicola and Huffman (2011). Laboratory data qualifier codes, such as "D" for dilution, are not shown.…”

“…2) (URS Greiner, Inc., 1999). The U.S. Navy regularly monitored contaminant concentrations in groundwater and surface water, along with tree health and water levels, to determine the effectiveness of phytoremediation (CH2M Hill Constructors, Inc., 2002, 2003, 2004, 2005. The USGS monitored geochemistry and contaminant concentrations in groundwater and surface water annually from 2001 through 2011 to evaluate reduction-oxidation (redox) conditions and CVOC biodegradation.…”