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REP00257
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REP00257
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Entry Properties
Last modified
8/24/2016 11:29:11 PM
Creation date
11/26/2007 9:36:57 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1999002
IBM Index Class Name
Report
Doc Date
6/23/2003
Doc Name
Cavity Characterization Plan
From
American Soda LLP
To
DMG
Media Type
D
Archive
No
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Decent6er 23, l 9l9 Page C'-3 <br />• C.3 FIELD SAMPLING PROCEDURE <br />This section gives the step-by-step procedures for collecting samples in the field. <br />Observations made during sample collection will 6e recorded in the field notebook and/or field data <br />sheet as specified in Section C.5 of this SOP. <br />C,3.1 Equipment Decontamination <br />Before any evacuation or sampling begins, all non-dedicated well probes, bailers, and other <br />sampling devices shall be decontaminated, as specified in the accompanying document Standard <br />Operating Procedures for Decontamination of Equipment, Groundwater, and Surface Water <br />Sampling. <br />C.3.2 Instrument Calibration <br />Electronic equipment used during sampling will generally include a pH meter with <br />temperature scale, a conductivity meter, and a water level measurement probe, although additional <br />equipment may be used for special studies. Before going into the field, sampling personnel shall <br />verify that all of the equipment is operating properly. The pH and conductivity meters require <br />• calibration prior to use every day. Calibration times and readings will be recorded in a notebook to <br />be kept by the field sampling personnel. Specific instructions for calibrating the instruments are <br />described in Section 6 and in the instruction manuals for each instrument. <br />C.3.3 Well Purging <br />The purpose of well purging is to remove standing water from the well, in order to collect <br />a representative water sample from the geologic formation being sampled while minimizing <br />disturbance to the collected samples. Before a sample is taken, the dedicated sampling equipment <br />will be purged until two sampling equipment volumes have been removed, or until the well is purged <br />dry. <br />Alternatively, this method is refen•ed to as "micropurging." Micropurging involves using a <br />pump with the suction point within the screened interval of the monitoring well. Small diameter <br />tubing is typically used to transfer formation water to this pump and to the surface. Purging this <br />system involves removing a volume of water equivalent to approximately two volumes of water <br />retained in the tubing and pump, During micropurging, the water level will be monitored. The <br />. pumping rate will be adjusted such that drawdown in the well does not exceed 0.1 meter. Samples <br />should be collected immediately after purging. Evacuated well water will be collected and disposed <br />of properly. <br />Agapito Associates, (ne. <br />
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