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e <br /> %4.Oe L` <br /> 20 December 2012 <br /> AGE-NC Project No. 01-0887 <br /> Page 2of5 <br /> shallow groundwater elevations at the site(four feet bsg), each soil boring will be advanced <br /> to a depth of three feet bsg for collection of a soil-vapor sample. <br /> Probe borings for soil-vapor willWestablished directly north and west of the warehouse <br /> building to evaluate the former product line release and dissolved petroleum plume; one <br /> additional boring will be established northeast of the second building on-site. Proposed <br /> boring locations are presented in Figure 2. <br /> Soil-vapor samples will be analyzed by a State of California Department of Public Health <br /> Services (CDPH)-certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with <br /> EPA Method TO-3; <br /> • BTEX and volatile organic compounds(VOCs)including all oxygenated compounds <br /> in accordance with EPA Method TO-15; and <br /> • Isopropyl alcohol (tracer gas) in accordance with EPA Method $lfl 506T 55' <br /> Requested reporting limits will be below risk-based screening levels. Further the requested <br /> reporting limit for the tracer gas will be equal to or below constituent reporting levels. <br /> The proposed soil-vapor boring locations are illustrated on Figure 2. Field procedures for <br /> advancement of borings and collection of soil-vapor samples are presented below. <br /> Laboratory reports for soil-vapor analyses, testing methods, laboratory quality assurance <br /> /quality control (QA/QC) reports, and sample chain of custody documentation will be <br /> presented in a report with findings and recommendations. <br /> REPORT PREPARATION <br /> Upon completion of field work and receipt of final laboratory analysis, a report of findings <br /> will be prepared presenting the findings of the investigation. The report will include a <br /> description of the work performed and results of the sampling and analysis and be signed <br /> by a California Professional Geologist. Conclusions, applicable recommendations, and <br /> maps will be included in the report. <br /> y <br /> Advanced GeoE nviro n mental,Inc. <br />