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0 0 <br /> Soil-Gas Investigation Workplan July 6, 2015 <br /> 200 N. Beckman Rd Page 4 <br /> • All field methods, parameters, and other pertinent information will be documented <br /> in a field log throughout the field activities. <br /> The soil vapor analytical results will be compared to the applicable shallow soil gas <br /> screening criteria (Environmental Screening Levels - ESLs) and, if warranted (if <br /> screening values are exceeded), and if required, the data can be used to develop <br /> an updated Tier 2 HHRA for the site. The updated HHRA, if warranted, will <br /> evaluate both Baseline Carcinogenic Risk and Baseline Toxic Effects for residential <br /> and commercial receptors. Volatilization to indoor air exposure scenarios will be <br /> evaluated using a one-in-a-million target risk level and a target hazard quotient of <br /> one. <br /> If required, an updated HHRA will be conducted in accordance with United States <br /> Environmental Protection Agency (EPA) and DTSC guidance, principally DTSC's <br /> Supplemental Guidance for Human Health Multimedia Risk Assessments of <br /> Hazardous Waste Sites and Permitted Facilities, and EPA's Risk Assessment <br /> Guidance for Super-fund. <br /> FIELD QUALITY ASSURANCE/QUALITY CONTROL <br /> Sampling equipment will be steam cleaned or thoroughly scrubbed with alconox <br /> solution followed by a distilled water rinse prior to being brought on site and <br /> between sampling locations. <br /> Chain of custody protocol will follow for all samples from the time of collection to <br /> the time of arrival at the off-site laboratory. <br /> The chain-of-custody program allows for the tracing of possession and handling of <br /> individual samples from the time of field collection through laboratory analysis. <br /> The document will include the signature of the collector, date and time of <br /> collection, sample number, number and type of sample containers including <br /> preservatives, parameters requested for analysis, signatures of persons and <br /> inclusive dates involved in the chain of possession. Upon delivery to the <br /> Environmental and Remediation Services since 19921 <br /> A <br />