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6.1.1 Field Measurements <br />Prior to collection of the groundwater parameters or samples, information regarding the <br />monitor well and previous sampling events will be recorded in a permanently bound <br />notebook. Once a groundwater monitor well has been located and properly identified, field <br />measurements will be recorded in the bound field notebook and in the field data sheet(s). <br />Groundwater monitoring well sampling procedures will include: <br />• Water level <br />• Low flow purging of stagnant water <br />• Field measurements of: temperature, pH and conductivity <br />• Collection of laboratory samples <br />• Data record generation <br />6.1.2 Laboratory Analysis <br />Analyses shall be performed by a certified laboratory. All laboratory analysis must meet the <br />following criteria: <br />• The most sensitive analytical method specified or approved in either 40 CFR 136.3 or <br />SW•846 must be used. Regulatory agencies will approve the analytical method, as <br />necessary. <br />• Each parameter shall have detection at or below the permit limits or the method <br />detection limit as defined in the analytical method. The facility is considered in <br />compliance if the reported results are Tess than the established permit limit. <br />6.2 QA/QC Water Samples <br />Field Quality Control is a part of the overall project Quality Assurance/Quality Control <br />(QA/QC) program and in accordance with the NS SAP. QC samples are those samples <br />prepared in the field or prior to field work for the purpose of accounting for the reliability of <br />field procedures, such as equipment decontamination and sample preparation (e.g., rinsate, <br />spikes, and blank samples). QA samples are those samples prepared in the field that <br />account for reliability of laboratory procedures, based on precision (e.g., duplicate samples). <br />6.3 Sample Custody and Documentation <br />A stringent, established program of sample chain -of -custody procedures shall be followed <br />during field sample collection and handling activities and transfer of the samples to the <br />analytical laboratory. Laboratory supplied chains -of -custody shall be utilized to maintain <br />control over access to samples during collection, preparation, transportation, and delivery. <br />All samples will have a unique identification label. Sample containers and shipping <br />containers will have custody seals. A Chain of Custody record will accompany the samples. <br />Daub & Associates, Inc. <br />Page 24 Natural Soda LLC 2015 EMP <br />