2023-05-25_PERMIT FILE - M2022048 ‎(7)‎

• Permit No: M2022048
• IBM Index Class Name: Permit File
• Doc Date: 5/25/2023
• Doc Name Note: Exhibit G - Water Information - Groundwater Quality Monitoring Plan
• Doc Name: Adequacy Review Response
• From: Environment Inc/LG Everist Inc
• To: DRMS
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

Appendix I Tables
Water Quality Parameter Lists
Sample parameters:
The sampling parameter list is based on collecting baseline data and obtaining recorded water quality
sample results from regular groundwater monitoring. Five quarters of baseline data will be collected for
the parameters as described below. After five quarters of baseline data, annual sampling of the wells will
be collected and reported for parameters as described below. Parameters in italics are also listed on the
South Platte River stream segment COSPMS01a for discharge permitting purposes.
FIELD MEASUREMENTS
Field Measurements are completed during the sample event to determine water quality stability for
sampling purposes and to obtain field measurements for comparison to laboratory provided data.
Table 1—Field Measurements
Parameter Frequency
pH Every Sampling event
Specific Conductance Every Sampling event
Temperature Every Sampling event
ORGANIC PARAMETERS
Table 2: ORGANIC PARAMETER RATIONAL
Monitoring for organic pollutants listed is useful for background or baseline data collection. The
parameters will not be collected for ongoing regular monitoring because they are "source" driven. A
source of the organic contaminant, e.g., a spill, a landfill, a drycleaning facility, parked equipment with
excessive leaks not regularly cleaned up, or a petroleum storage tank or similar incidents would have to
have contaminated soil and groundwater for the organic compounds to be detected. Baseline data
should provide knowledge that organics are "not present" and should be discontinued. Groundwater
monitoring wells can be resampled for verification if a parameter is detected. The organics are listed in
Table A in Reg 41—Colorado Basic Groundwater Standards.The list does not include pesticides,
herbicides, PCBs, and other site-specific organics that are not expected to be in groundwater.
Table 2: Organics
Parameter Frequency
VOCS Five Quarters of Baseline;
Volatile Organic Compounds annually unless omitted for non-detects or other factors
SVOC Five Quarters of Baseline;
Semi-Volatile Organic Compounds annually unless omitted for non-detects or other factors
PAH Five Quarters of Baseline;
Polycyclic Aromatic Hydrocarbons I annually unless omitted for non-detects or other factors
Organics will be evaluated after 5 quarters of data analysis and if no detections will automatically be
omitted from future analysis. If there is a confirmed and verified analytical result that is not explained
in the evaluation period, quarterly analysis will continue until the issue is resolved or the data
continues to show a downward trend and discontinuing is approved by DRMS.
FgAjMOLEN LG Everist Sampling Plan List of Parameters
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