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3.1 Primary Drinking Water Standards <br />• Primary drinking water parameters tested for include (arsenic, fecal Coliform, fluoride, mercury, and nitrate). Out of these five <br />parameters, arsenic, fecal Coliform, and nitrate exceeded Colorado's Primary Drinking Water Standards (PDWS) at least one <br />lime during the October 2005 and October 2006 sampling events. <br />3.1.1 Arsenic <br />The arsenic concentrations in CRMW01 and CRMW04 exceeded the PDWS of 0.01 mg/L in the April 2007 sampling event. <br />The arsenic concentrations were higher in both the April 2006 and April 2007 sampling events. Arsenic concentrations did not <br />exceed the baseline levels in the wells sampled in December 2006 through October 2007. The soils in the area are known to <br />have higher natural concentrations of arsenic. The samples collected in November and December 2005 and December 2006 <br />through October 2007 were reported as dissolved arsenic. Other samples reported below are reported as total arsenic. <br />Arsenic <br />Wells (CRMW) <br /> Site/Group <br /> O1 02 04 05 O6 07 09 16 40 41 42 A VG <br />Ocl-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 0.014 ---- 0.13 ---- 0.02 •--- ---- •--- ---- 0.0093 ---- 0.0433 <br />Jul-O6 0.0043 0.014 0.0032 ---- 0.01 0.015 ---- ---• 0.013 0.0033 ---• 0.0090 <br />Oct-06 0.0047 ---- 0.0057 ---- 0.0075 ---- ---- ---- ---- U ---• 0.0045 <br />Dec-06 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---• ---- <br />Apr-07 0.016 ---- 0.023 ---- 0.0078 ---- ---- ---- ---- U ---- 0.0117 <br />Jul-07 --- ---- ---- ---- <br />Oct-07 0.0039 ---- 0.0025 ---- 0.0021 ---- -•-- ---- ---- 0.0015 ---- 0.0025 <br />Average 0.0059 0.0105 0.0209 ---- 0.0063 0.0105 ---- ---- 0.0090 0.0023 ---- 0.0088 <br />Stnd Dev. 0.0060 0.0049 0.0447 ---- 0.0067 0.0064 ---- -•-- 0.0057 0.0033 ---- 0.0208 <br />2006 <br />Baseline 0.03 ---• 0.10 ---- 0.03 ---• ---- ---- ---- 0.03 ---- 0.03 <br />2007 <br />Baseline 0.03 ---• 0.10 ---- 0.03 ---- ---- ---- ---- 0.03 ---- 0.03 <br /> <br />The average arsenic level for the entire site has decreased 0.0007 mg/L from the Water duality Baseline Report (WOBR) to <br />0.0088 mg/L for Lupton Lakes, Fort Lupton, Colorado, dated January 2007, and prepared by Civil Resources, LLC. The <br />standard deviation is 0.02 mg/L. There are no identifiable spatial trends at this time. <br />C7 <br />Annual 2007 Sampling Report -Lupton Lakes -3- January 2008 <br />