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October 21, 2015 <br /> Reference: Response to California Regional Water Quality Control Board, Central Valley <br /> Regional Letter dated June 15, 2015 and Request for Additional Methane and Soil <br /> Gas VOC Investigation <br /> assist in providing evidence that biodegradation is occurring. During this investigation, at <br /> depths where percent 02 may indicate a potential bioattenuation zone, at least one <br /> sample will also be collected for analysis of VOCs. <br /> The primary objective of the assessment is to identify what types of bio-attention (aerobic or <br /> anaerobic) may be occurring in the upper b feet. The soil vapor analytical results will be used to <br /> evaluate potential human health impacts to current/future residential receptors and/or the future <br /> utility and construction worker. The general scope of work proposed by Stantec includes the <br /> following: <br /> ❑ Prepare a site-specific Health and Safety Plan (HASP). <br /> ❑ Locate subsurface utilities. <br /> ❑ Install and sample up to 12 soil gas probes (Ex.SSGP-1 through SSGP-12). <br /> ❑ Laboratory analysis of shallow soil gas probes will be performed in real time using a mobile <br /> lab on-Site. <br /> ❑ Submittal of a results report, including recommendations for a path forward, following <br /> completion of this investigation. <br /> 5 <br />