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MQuality Assurance/Quality Control Plan Martin Metals Finishing Inc. (Former) Stockton, California 4 FIELD PROCEDURES This section outlines the planned sampling activities for the Site. Field work will be performed under the supervision of a California-registered professional geologist or civil engineer. 4.1 Sample Collection Procedures 4.9.E Trench Sediment Sample Collection Trench sediment samples will be collected using single-use polystyrene sampling scoops.A new sampling scoop will be utilized at each location to prevent cross-contamination. Sediment will be collected into containers for laboratory analysis as shown in Table C-2.Appendix C-1 includes CDIM Standard Operating Procedure(SOP) 2.2 "Surface and Shallow Soil Sampling." 4.9.2 Soil Boring Advancement Each of the soil borings will be advanced to a target depth of 15 ft bgs. CDIM's contractor will perform concrete coring where required, then advance the boring using a hand auger to five ft bgs to ensure the area is clear of subsurface utilities or obstructions.The driller will then utilize a direct-push drill rig with continuous acetate- lined core sampler attachment to advance each boring to the target depth. Field staff will log the soils from each boring and note soil type, estimates of grain size distribution, color, moisture, evidence of contamination (e.g., staining or discoloration, odor, etc.). To measure volatile vapors in soils, field staff will place soil in a zip-top bag, allow it to equilibrate, and utilize a photoionization detector(PID)or organic vapor analyzer(OVA)to collect a reading'. 4•1.3 Subsurface Soil Sample Collection CDIM will collect up to three soil samples from each boring, at target depths of 5 ft bgs, 10 ft bgs and 15 ft bgs in accordance with CDIM SOP 2.1, "Subsurface Soil Sampling"(Appendix C-1). Volatile samples will be collected with a TerraCore kit from the undisturbed soil core in accordance with USEPA Method 5035. All other samples will be collected into soil containers provided by the analytical laboratory. Samplers will change gloves between collection of each sample to avoid cross-contamination. Table C-2 summarizes sample containers, preservatives and holding times for the required soil sample analysis. Groundwater is not expected to be encountered at the target boring depth, and therefore no groundwater samples are planned. ' Volatile vapor screening instruments will be calibrated and maintained in accordance with the manufacturer's recommendations. Calibration will be documented in a calibration log (Appendix C-2). CDIM—Fairgrounds Industrial Park Page 7