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(KLE//VFELOER <br /> Bright People,Bight Solutions. <br /> 3.3.4 Investigation-Derived Waste Sampling <br /> One composite Investigation-Derived Waste (IDW) sample, consisting of one soil jar from each generated <br /> drum, will be submitted and analyzed for Title 22 Metals, TPH-mo/d,TPH-g, and VOCs, and other testing <br /> required by the landfill. <br /> 3.4 QUALITY ASSURANCE/QUALITY CONTROL <br /> The below section outlines the standard QA/QC measures that will be followed during this event. <br /> 3.4.1 Equipment Decontamination <br /> Sampling equipment(i.e., hand auger bucket, reusable bailers,etc.)that will be reused between locations <br /> will be cleaned prior to collection of each sample by the following procedure: <br /> • Clean equipment with a LiquinoxTM detergent solution and a scrub brush to remove residual soil <br /> and extraneous materials. <br /> • Rinse equipment with tap water. <br /> • Double rinse equipment with distilled or de-ionized water. <br /> Cleaning of sampling equipment will be conducted on plastic sheeting in a pre-designated area. After <br /> cleaning, items will be stored on visibly clean plastic sheeting. It is anticipated that rinsate water <br /> generation will be minimal and it may be drummed along the soil cuttings. If greater than 2 gallons of <br /> rinsate water is generated, it will be placed in its own drum or DOT rated 5-gallon bucket. <br /> 3.4.2 Field Duplicate Samples <br /> Duplicate samples collected in the field provide data precision information for the entire measurement <br /> system including sample collection, homogeneity, handling, shipping, storage, preparation, and analysis. <br /> The identity of these co-located duplicate samples is not revealed to the laboratory in an effort to avoid <br /> bias. Field duplicate samples will be collected at a rate of 1 duplicate for every 20 samples per matrix. For <br /> this ESA, one duplicate samples is anticipated. <br /> Anticipated duplicate samples are as follows: <br /> • One duplicate groundwater sample will be collected and submitted for TPH and VOCs. <br /> 25001155.006A/ST0240174614 Page 8 of 17 November 8, 2024 <br /> ©2024 Kleinfelder www.kleinfelder.com <br />