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2007-02-02_HYDROLOGY - M2004078
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2007-02-02_HYDROLOGY - M2004078
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Last modified
8/24/2016 3:16:34 PM
Creation date
3/18/2008 4:06:32 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M2004078
IBM Index Class Name
HYDROLOGY
Doc Date
2/2/2007
Doc Name
Draft water quality baseline report (part 1)
From
Brad L Hagen
To
DRMS
Email Name
CBM
Media Type
D
Archive
No
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1.0 INTRODUCTION <br />The following report describes the results from the October 2006 Sampling Event and analyzes the results of the <br />sampling events over the past year. The sampling results are then used to establish background or "baseline" levels for <br />the parameters that have been tested in general compliance with approved Groundwater Sampling and Analysis Plan <br />(GWSAP) included in Technical Revision 2 (TR2) to the Lupton Lakes Gravel Permit issued by the State of Colorado <br />Division of Minerals and Geology. <br />2.0 OCTOBER GROUNDWATER MONITORING RESULTS <br />The October 2006 Sampling Eventincluded monitoring wells (CRMW) 01, 02, 04, 05, 06, 07, 09, 16, 40, 41, and 42. <br />This sampling indicated that the Primary Drinking Water Standards (PDWS) were exceeded for sulfate and nitrates. <br />Nitrate (as N) exceeded PDWS in seven of the eleven wells across the site ranging from undetected up to 70.3 <br />milligrams per liter (mg/L). Sulfate exceeded PDWS in one well (CRMW01) with a concentration of 263 mg/L. Fluoride, <br />mercury, fecal Coliform, or Total Arsenic did not exceed the PDWS in any of the wells tested in the October 2006 event. <br />Secondary Drinking Water Standards (SOWS) were exceeded for Total Dissolved Solids (TDS) (648 to 1,250 mg/L) and <br />Total Iron (5.5 up to 130 mg/L). Iron and total dissolved solid levels have consistently exceeded drinking water <br />standards across the site in each of the sampling events. The remainder of the SOWS parameters that were tested for <br />did not exceed the SOWS. <br />There were no detections of chlorinated herbicides, aromatic volatile organics, or organochlorine compounds detected in <br />CRMW 01, CRMW 04, CRMW 06, or CRMW 41. Additional parameter test results and the summary of all laboratory <br />analysis results are contained in the attached tables. <br />Figure 1 shows the location of the monitoring wells and the groundwater elevations measured during the October <br />sampling event. The gradient is northwest toward the South Platte River. The results of this sampling event are <br />consistent with anticipated results when the GWSAP was developed. Further sampling will be completed in December <br />consistent with the approved GWSAP. <br />3.0 ANNUAL GROUNDWATER MONITORING RESULTS <br />The groundwater quality monitoring results were tabulated and evaluated based on the Primary and Secondary Drinking <br />Water Standards and additional parameters. These standards are intended as general guidelines for this monitoring <br />activity. The results were compared to current standards along with spatial and temporal trends. A complete listing of <br />test results can be found at the end of this report in Appendix A. <br />The background levels for the parameters listed below are established based on site wide averages and standard <br />deviations. Individual wells, should be evaluated for higher "baseline" averages as shown in red on the following tables. <br />These higher levels in the individual wells are considered the baseline/background level of the parameter for the specific <br />well if it has a higher concentration level than the site wide background level. Wells with less than five sampling events <br />were not considered for background level determination when the well average and standard deviation was used. <br />3.1 Primary Drinkin4 Water Standards <br />Primary drinking water parameters tested for include (arsenic, fecal Coliform, fluoride, mercury, and nitrate). Out of <br />these five parameters, arsenic, fecal Coliform, and nitrate exceeded Colorado's Primary Drinking Water Standards <br />(PDWS) at least one time during the October 2005 and October 2006 sampling events. <br />• <br />Annual 2006 Sampling Event -Lupton Lakes -1- January 2007 <br />
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