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4.6 Waste Sampling <br /> Wastewater and waste soil samples generated from Site investigative activities will be stored on site in a <br /> 55-gallon storage drums. Wastewater will be sampled once for characterization using a disposable bailer <br /> for appropriate off-site disposal. Soil samples will also be sampled once for characterization. Depending <br /> on the volume of soil generated, which is anticipated to be less than two 55-gallon drums, a composite <br /> sample from each of the drums, will be collected. Waste samples will be analyzed for the following <br /> parameters: <br /> Waste Soil and Groundwater Sampling: <br /> • Test Methods for Evaluating Solid Waste, Physical Chemical Methods,SW-846, Update III (EPA <br /> 1996): <br /> — CCR Title 22 Metals by EPA Method 60106/7471A <br /> — SVOC by EPA 8270CTotal Petroleum Hydrocarbons (TPH)-Gas by EPA Method 5035/80156 <br /> — TPH-Diesel & Motor Oil by EPA Method 80156 <br /> — VOCs by EPA Method 5035/82606 <br /> If necessary, the following analyses will be performed for cost effective disposal: <br /> — Soluble Threshold Limit Concentration (STLC) by California Waste Extraction Test and EPA <br /> Method 60106 <br /> — Toxicity Characteristic Leaching Procedure (TCLP) by EPA Methods 1311/60106 <br /> 4.7 Equipment Decontamination <br /> Decontamination of non-disposable sampling equipment (e.g., drill rods) that comes in contact with <br /> samples will be performed to prevent the introduction of extraneous material into samples and to prevent <br /> cross-contamination between samples. All drilling sampling equipment will be decontaminated by steam <br /> cleaning. Decontamination water will be collected in 55-gallon U.S. Department of Transportation- <br /> approved drums. <br /> The following procedures will be used for decontamination of non-disposable sampling equipment: <br /> • If mud or soil is adhering to the sampling equipment, first rinse with potable water. This step <br /> will decrease the gross contamination and reduce the frequency at which the non-phosphate <br /> detergent and water solution needs to be changed. <br /> • Wash with the non-phosphate detergent and water solution.This step will remove remaining <br /> contamination from the equipment. Dilute the non-phosphate detergent as directed by the <br /> manufacturer. <br /> • Rinse with potable water. Change the water frequently. <br /> FINAL RIPON PCE INVESTIGATION WORK PLAN.DOCX 4-11 PROJECT NO.631021512 <br />