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Phase II Sampling and Analysis Plan SOP-5—Equipment Decontamination Port of Stockton-Rail and Bridge,Stockton,CA FN 5.1 Start-Up Activities 5.1 .1 Office The FTL will confirm that sufficient equipment and supplies are available at the site based on the number of samples and estimated field days. 5.1 .2 Field After arrival on site, but prior to commencement of operations, the FTL will confirm that decontamination supplies and equipment are available on site and review procedures with field staff. 5.2 Field Operations 5.2.1 Decontamination Procedures The required decontamination procedure for large pieces of equipment such as drill rigs, auger flights, and drilling and well casing is: 1. Wash the external surface of equipment or materials with high pressure hot water and Alconox or equivalent, and scrub with brushes, if necessary, until all visible dirt, grime, grease, oil, loose paint, rust flakes, etc., have been removed from the equipment. 2. Air dry. 3. Decontamination wastewater will remain at the site and be analyzed prior to final disposition according to the work plan The required decontamination procedure for sampling equipment is: 1. Wash and scrub with Alconox solution (or equivalent) and nylon brushes. 2. Double tap water rinse. 3. Collect decontamination rinse water in 5 gallon buckets. Rinse water will be combined with other wastewater generated during sampling activities and managed according to the work plan. 5.2.2 Equipment Rinsate Collection When non-dedicated sampling equipment is used, the equipment will be decontaminated before initial use and after each sample is collected. At least one equipment rinsate will be collected for each sampling protocol daily. In the event samples will be analyzed for PFAS, the rinsate blank should be collected in between borings where soils to be analyzed for PFAS are collected. Equipment rinsate samples will be collected to be representative of field decontamination procedures. 5-2