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E
<br />quality constituent trends were evaluated using Mann -Kendall / Sen's Slope trend
<br />analyses to determine if significant increasing or decreasing trends were evident in the
<br />data. Trend analyses, performed by Herst & Associates, are presented in Appendix D
<br />and are summarized below. Wells and analytes not discussed below either do not show
<br />significant trends (rising or falling) or have too few data points to establish meaningful
<br />trends.
<br />Well
<br />Increasing Trends
<br />Decreasing Trends
<br />Number
<br />AMW-1
<br />Arsenic, Barium, Bicarbonate,
<br />Nitrate -N, pH, Sulfate, 1,2 -DCB, Chloroethane,
<br />Specific Conductance, 1,1 -DCA,
<br />DCDFM
<br />Chlorobenzene, cis-1,2-DCE
<br />AMW-3
<br />None Apparent
<br />None Apparent
<br />AMW-4
<br />Nitrate -N, pH
<br />Calcium, Chloride, Magnesium, Potassium,
<br />Specific Conductance, Strontium, TDS, 1,1 -DCA,
<br />1,4 -DCB, cis-1,2-DCE, Benzene, DCDFM, PCE,
<br />trans-1,2-DCE, TCE, Vinyl Chloride
<br />AMW-5R
<br />Bicarbonate, Chloride, Nitrate -N,
<br />PCE
<br />pH, Potassium, Sodium, Specific
<br />Conductance, Sulfate, TDS
<br />AMW-10
<br />Sulfate, cis-1,2-DCE
<br />Barium, Bicarbonate, Calcium, Chloride,
<br />Magnesium, Nitrate -N, Potassium, Sodium,
<br />Specific Conductance, Strontium, TDS, 1,1 -DCA,
<br />DCDFM, PCE, TCE
<br />AMW- I I
<br />pH
<br />Barium, Chloride, Magnesium, Potassium,
<br />Specific Conductance, TDS, 1,1 -DCA,
<br />cis-1,2-DCE, DCDFM, PCE, TCE
<br />AMW-18
<br />Bicarbonate
<br />Chloride, Nitrate -N, Potassium, Sodium, Sulfate,
<br />TDS
<br />AMW- 19
<br />Barium
<br />Hexavalent Chromium, Nitrate -N, Sulfate
<br />AMW-19BR
<br />Chloride, pH
<br />Hexavalent Chromium, Nitrate -N, Sulfate
<br />Notes: 1,4 -DCB — 1,4-dichlobenzene cis- 1,2-DCE — cis- 1,2-dichloroethene
<br />trans-1,2-DCE —trans- 1,2-Dichloroethene 1,2 -DCB — 1,2 -dichlorobenzene
<br />As shown in the table above, significant increasing trends were calculated for one or
<br />more VOC constituents in CAP wells AMW- I and AMW-10, while decreasing VOC
<br />trends were noted for several VOCs in CAP wells AMW-I, AMW-4, AMW-5R,
<br />AMW-10, and AMW-11. The increasing trend exhibited for cis- 1,2-DCE at wells
<br />AMW- I and AMW- 10, suggests reductive dechlorination is occurring in the vicinity of
<br />these wells.
<br />Two domestic wells (7898-A and 8106-A) were sampled on August 27, 2012. Table 3-3
<br />summarizes the current analytical results for the domestic well samples collected. In the
<br />samples collected from wells 7898-A and 8106-A, PCE was measured above the PQL.
<br />DCDFM and TCE were also measured above the PQL in the sample collected from well
<br />8106-A. Estimate trace concentrations of one or more VOC were also measured in wells
<br />7898-A and 8106-A.
<br />C:\zolz-oozsFnsQu.doc 11 Geo -Logic Associates
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