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2020-02-26_REVISION - M2002004
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2020-02-26_REVISION - M2002004
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Last modified
12/27/2024 5:38:41 PM
Creation date
2/26/2020 1:33:04 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2002004
IBM Index Class Name
REVISION
Doc Date
2/26/2020
Doc Name
Adequacy Review Response
From
Resource Hydrogeologic Services
To
DRMS
Type & Sequence
TR7
Email Name
JPL
Media Type
D
Archive
No
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Title: Sampling and Analysis Plan for Environmental Control Number: Revision Date: page 6 of 30 <br /> Groundwater Monitoring PUE.EN.D.026.04 2/19/2020 <br /> 2.1 Sampling Locations <br /> Groundwater monitoring currently occurs at three monitoring wells (Figure 1). Well MW-5 <br /> was installed between the plant site and the Edson Arroyo in July of 2008. The well is <br /> completed in claystone (weathered shale)beneath a surficial clayey soil and screened from 9 <br /> to 25 feet. The borehole extended to 29 feet, but was terminated in the same claystone. Well <br /> MW-5 has been dry since it was installed. <br /> The other two site environmental monitoring wells are MW-6 and MW-7,which were installed <br /> in the Fort Hayes Limestone during December 2017 (Close Consulting Group, 2018). These <br /> wells were drilled in the area of a suspected fault downgradient of the second mine panel. Prior <br /> to drilling these wells, no free water had been encountered in the Fort Hayes or Codell <br /> Sandstone during other site drilling and well installations. The fault/fracture system that results <br /> in water occurring in these wells transects both the Fort Hayes and Codell. <br /> As mining progresses or compliance matters arise, additional monitoring wells will be <br /> installed. This SAP will also apply to those wells, unless specific modifications are approved <br /> by DRMS as part of future Technical Revisions. <br /> 2.2 Monitoring Frequency <br /> Groundwater monitoring currently is performed semi-annually for dry wells (MW-5) and <br /> quarterly for wells that typically produce water(MW-6 and MW-7). Quarterly monitoring is <br /> typically scheduled for April, June, September and December. Semi-annual monitoring is <br /> typically performed in June and December. Unexpected circumstances or adverse weather/site <br /> conditions may require that a sampling date be rescheduled or modified, but GCC will strive <br /> for overall consistency in the sampling schedule. <br /> 3.0 SAMPLING METHODS <br /> This section of the SAP presents a summary of groundwater documentation requirements, <br /> water level measurement procedures, field water quality measurement procedures, <br /> groundwater sample collection procedures, decontamination procedures, sample handling and <br /> custody requirements, and field QA/QC samples. <br /> 3.1 Documentation and Records <br /> Documentation during field activities is completed through the use of field sampling forms. <br /> The intent of field documentation is to provide complete documentation of the methods of <br /> sampling and consistency between sampling events. Examples of field reporting forms that <br /> may be used to document a sampling event are included in Appendix A. <br /> 3.2 Water Level Measurements <br /> Depth to groundwater generally will be measured with an electronic water-sensing device. The <br /> measurement will be made relative to a marked measurement point at the well head(commonly <br /> the top of the PVC casing),and will be recorded to the nearest 0.01 foot.The total depth of the <br /> well will also be recorded for each well during each monitoring event. These measurements <br /> will be used to measure and record the initial static water level and wetted casing volume. Water <br /> levels may also be recorded after removal of each wetted casing volume during purging and <br /> sampling. <br />
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