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Samples will be analyzed by EPA Method 8260B and EPA 8260B-SIM to achieve lower reporting limits in a <br /> California certified laboratory. The following laboratory reporting limits will be provided and are <br /> sufficiently low to be compared to the applicable sub slab/soil gas ESL: <br /> EMAX Laboratories <br /> RL <br /> VOC Compounds Tier 1 ESL (pg/L) <br /> Vinyl Chloride 0.0086 0.030 <br /> 1,1-Dichloroethene 3.2 0.5 <br /> trans-1,2-Dichloroethene 10 0.5 <br /> cis-1,2-Dichloroethene 6.0 0.5 <br /> Trichloroethene 1.2 0.5 <br /> Tetrachloroethene 0.64 0.5 <br /> Notes: <br /> ESL San Francisco Bay Regional Water Quality Control Board Environmental Screening Levels January 2019(Rev. 1) <br /> pg/L microgram per liter <br /> RL reporting limit <br /> VOC volatile organic compound <br /> IDW generated during investigation activities including soil and purge water will be sampled, profiled,and <br /> temporarily stored on Site pending disposal to an appropriate landfill. <br /> 4.4 Photoionization Detector Screening and Conditional Soil <br /> Sampling <br /> During the advancement of the three groundwater DPT borings, APTIM will collect soil samples for <br /> lithologic description and screening for VOCs using a PID. A PID that can detect low-level total VOCs <br /> (approximately 10 parts per billion by volume) will be used to survey soil cores at approximate five foot <br /> intervals. If elevated PID readings are observed in the soil cores, soil samples will be submitted for <br /> laboratory analysis of VOCs. It is anticipated that up to three soil samples per each of the three DPT <br /> boreholes may be sent for laboratory analysis of VOCs. PID procedures are described below: <br /> 1. Check calibration of the PID at the beginning of each workday according to the instrument <br /> manufacturer's specifications. Calibration results must be recorded on the appropriate field <br /> forms. <br /> 2. At each of the three borehole locations, collect a sub-sample of the extracted soil core from <br /> the approximate depth intervals,5 feet bgs, 15 feet bgs, and 25 feet bgs. Place the sub-sample <br /> in a sealable plastic bag and seal the bag. Wait approximately 15 minutes for off gassing of <br /> potential soil vapors. <br /> 3. Turn on the PID meter and hold it in an open space away from the soil sampling area. If the <br /> PID meter reads zero then proceed to evaluate soil sub-samples. <br /> FINAL RIPON PCE INVESTIGATION WORK PLAN.DOCX 4-5 PROJECT NO.631021512 <br />