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OU 3 Work Plan <br />Spot <br />Check <br />Slide <br />Hammer <br />Passive Soil Gas <br />Survey <br />Soil Vapor Soil Hydropunch <br />Explorations <br />Samples 18 (100%) <br />Analyses <br />For each of the 18 Phase II results noted in the Existing Data sections, Kleinfelder will assess the <br />initial Phase II paper-copy laboratory reports and tabulate the associated laboratory <br />reporting/detection limits and screening levels. Kleinfelder will provide these data to the Board for <br />its review. <br />OPERABLE UNIT 4 <br />OU 4 Description <br />OU 4 Corresponds to Sub-Recommendation 12.2, which concerns then-former and existing fuel <br />oil and product lines. The Phase I identified potential for soil contamination via leaks/spills of <br />petroleum-related compounds. Phase II samples were collected and analyzed petroleum-related <br />compounds. <br />Petroleum: Existing Data <br />Nine soil samples were analyzed for TPHd, TPH1o, and TPHueh (EPA 3550, DHS Luft) (Table <br />0U4-P, soil samples 12-25 through 12-28, 12-32 through 12-34). These analyses yielded 27 <br />results, of which all are non-detect (ND). Laboratory reporting limits are not tabulated. <br />Petroleum: Recommendations <br />While OU 4 soil results are all ND, there are not enough soil results for OU 4 to strongly indicate <br />a statistical distribution constrained well below reporting limits. Kleinfelder therefore recommends <br />tabulating OU 4 soil reporting limits and evaluating them against Protection of Groundwater SSLs. <br />It is anticipated that this exercise demonstrate that reporting limits typically only marginally exceed <br />Protection of Groundwater SSLs. This should provide the Board the data it needs to demonstrate <br />due diligence in concluding that these data warrant no further action, even if some reporting limits <br />exceed Protection of Groundwater SSLs. <br />20173951.001A/SAC17R68420 Page 8 of 26 November 2, 2017 <br />© 2017 Kleinfelder www.kleinfelder.com <br />KLEINFELDER 2882 Prospect Park Dr., Suite 200, Rancho Cordova, CA 95670 p I 916.366-1701 f I 916.366-7013