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11.1 Arsenic <br />The arsenic concentrations do not exceed the PDWS levels of 0.01 mg/L in the 2008 sampling events. The arsenic <br />concentrations were higher in both the April 2006 and April 2007 sampling events. Arsenic concentrations did not exceed the <br />baseline levels in the wells sampled in July 2006 through October 2008. The samples collected in November and December <br />2005 and December 2006 through October 2008 were reported as dissolved arsenic. Other samples reported below are <br />reported as total arsenic. <br />Arsenic <br /> Wells (CRMW) Site/Group <br /> <br /> 01 02 04 05 06 07 09 16 40 41 42 A VG <br />Oct-05 0.004 0.007 0.003 ---- 0.003 0.006 ---- ---- 0.005 0.004 ---- 0.0046 <br />Nov-05 U ---- U ---- U ---- ---- ---- ---- U ---- 0.0000 <br />Dec-05 U ---- U ---- U ---- ---- ---- ---- U ---- 0.0000 <br />Apr-06 0.0140 ---- 0.1300 ---- 0.0200 ---- ---- ---- ---- 0.0093 ---- 0.0433 <br />Jul-06 0.0043 0.0140 0.0032 ---- 0.0100 0.0150 ---- ---- 0.0130 0.0033 ---- 0.0090 <br />Oct-06 0.0047 ---- 0.0057 ---- 0.0075 ---- ---- ---- ---- U ---- 0.0045 <br />Dec-06 ---- ---- ---- ---- --- <br />---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />Apr-07 0.0160 ---- 0.0230 ---- 0.0078 ---- ---- ---- ---- U ---- 0.0117 <br />Jul-07 ---- ---- ---- ---- ---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />Oct-07 0.0039 ---- 0.0025 ---- 0.0021 ---- ---- ---- ---- 0.0015 ---- 0.0025 <br />Jan-08 ---- ---- ---- ---- --- <br />---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />Apr-08 0.0044 --- 0.0017 --- 0.0020 --- ---- ---- --- 0.0012 ---- 0.0023 <br />Jul-08 ---- ---- ---- ---- ---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />---- <br />----- <br />Oct-08 0.0036 ---- 0.0035 ---- ---- ---- 0.0019 ---- ---- 0.0014 ---- 0.0026 <br />Average 0.0055 0.0105 0.0173 ---- 0.0058 0.0105 0.0019 ---- 0.0060 0.0021 ---- 0.0079 <br />Stnd <br />Dev. 0.0053 0.0049 0.0402 ---- 0.0064 0.0064 ---- --- 0.0057 0.0029 ---- 0.0192 <br />2007 <br />Baseline 0.03 ---- 0.10 ---- 0.03 ---- ---- ---- ---- 0.03 ---- 0.03 <br />The average arsenic level for the entire site has decreased 0.0004 mg/L from 2007 to 2008. The standard deviation is 0.0192 <br />mg/L. There are no identifiable spatial or temporal trends at this time. <br />Annual 2008 Sampling Report - Lupton Lakes -3- December 2008