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KLE/NFELDER <br /> Bright People.Right Solutions. <br /> EPA) Method 5035.Following completion of sampling, each bore will be backfilled with Portland <br /> cement grout mixed with 5-percent bentonite. <br /> Reusable sampling equipment will be cleaned prior to collection of each sample by washing in a <br /> non-phosphate detergent (i.e., LiquinOXTM) and tap-water wash, using a brush to dislodge soil, <br /> dirt, or other encrusted materials, and then double-rinsing in distilled or deionized water. <br /> Kleinfelder field personnel, under the supervision of a State of California-registered Professional <br /> Geologist, will prepare lithologic logs of the soil encountered during the drilling activities. Soil <br /> samples from the bores will be logged in accordance with the Unified Soils Classification System. <br /> Each soil sample retained for laboratory analysis will promptly be labeled with a unique sample <br /> identifier and appropriate project and sampling information, and then it will be placed into a water <br /> ice-chilled sample cooler for temporary storage until the samples are submitted, accompanied by <br /> chain of custody, to the subcontracted California Environmental Laboratory Accreditation <br /> Program-accredited laboratory for analysis. The near surface soil samples, 2.5-foot soil samples, <br /> and one of the deeper soil samples will be analyzed for total petroleum hydrocarbons with carbon- <br /> chain identification (TPH-ccid) using US EPA Method 8015B (or equivalent), VOCs using US EPA <br /> Method 8260B, California Code of Regulations (CCR) Title 22 Metals using US EPA Methods <br /> 601013/7471A, and for (OCPs) using US EPA Method 8081. The laboratory will be requested to <br /> perform the analytical testing using a standard turn-around time. <br /> Task 4— Investigation-Derived Waste Characterization and Disposal <br /> Investigation-derived waste(IDW), comprised of soil cuttings and sampling equipment wash water <br /> generated during the field activities, will be contained and stored temporarily on Site in labeled, <br /> Department of Transportation-approved 55-gallon steel drums while awaiting IDW profiling and <br /> removal. The results of soil samples collected will be used to profile the soil for disposal. The <br /> laboratory will be requested to perform these analytical tests using its standard turn-around time. <br /> After receipt of the analytical results and completion of waste profiling, a subcontracted licensed <br /> waste hauler will remove the IDW and transport it off Site for disposal at an appropriate licensed <br /> facility. <br /> 20190071.001A/LH23C153083 Page 2 of 4 April 28, 2023 <br /> Copyright 2023 Kleinfelder www.kleinfelder.com <br />