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OU 11: Work Plan <br />Spot <br />Check <br />Slide <br />Hammer <br />Passive Soil <br />Gas Survey <br />Soil <br />Vapor Soil Hydropunch <br />Explorations <br />OU11_SG-01 <br />through <br />OU11 SG-07 <br />OU11 6-7 and OU11_6-7. <br />Samples 7 6 2 <br />Analyses <br />TPH, <br />Chlorinated <br />Solvents, 4,4'- <br />DDE, 4,4'-DDT <br />CAM 17 <br />metals, <br />TPH, VOCs, <br />Solvents, <br />Pesticides, <br />Herbicides <br />CAM 17 <br />Metals, TPH. <br />VOCs, <br />Solvents, <br />Pesticides, <br />Herbicides <br />Prior to subsurface investigation, Kleinfelder will perform a Passive Soil Gas Survey (PSGS) with <br />29 Amplified Geochemical Imaging@ (AGI, formerly known as the GORE-SORBERTM) modules <br />(Figure 0U8-1). These modules produce chemical mass values that correlate with concentrations. <br />These mass value data will be used to qualitatively assess relative differences in subsurface <br />conditions prior to subsurface investigation. PSGS petroleum data will be used with the regression <br />model developed with OU 5 and OU 8 data to estimate potential petroleum-related <br />concentrations. Given existing Phase II data, it is anticipated that these data will not indicate <br />groundwater or soil contamination exceeding relevant ESLs. OU II exploration and PSGS <br />pesticide data will be combined with similar OU 9 pesticide data to develop a regression model to <br />estimate potential pesticide concentrations in OU 11 soil and groundwater. <br />Kleinf elder will advance one pushprobe boring at the location of Phase II sample 6-7, where 4,4'- <br />DDE was detected at 1,500 ug/mg and 4,4'-DDT was detected at 2,700 ug/kg and metal and <br />petroleum-related concentrations also appeared elevated (Figure OU11-1, sample OU11 6-7) <br />and one pushprobe boring at the location of Phase II sample 6-8, where soluble lead was <br />detected. To define lateral and vertical contamination extent, Kleinf elder will collect samples at 2, <br />5, and 10 feet. Kleinfelder will also collect Hydropunch groundwater samples. Samples will be <br />analyzed for pesticides/herbicides, TPH, chlorinated solvents, VOCs, and CAM 17 metals. CAM <br />17 metal samples will be field filtered prior to analysis. Soil results will be evaluated against <br />Industrial Thresholds and groundwater results will be evaluated against EPA Tap Water and Tier <br />1 Groundwater ESLs. Kleinf elder will combine pesticide data from OU 11 and OU 9 to develop a <br />regression model to estimate pesticide concentrations in groundwater and soil from PSGS <br />pesticide data. <br />Based on proposed industrial use, depth of contaminated soil, and the concrete cap that will be <br />installed as part of the Site construction, Kleinfelder will base further recommendations on soil <br />and groundwater data. These data will indicate either: <br />Groundwater concentrations below EPA Tap Water and Tier 1 Groundwater ESLs and <br />soil concentrations below Industrial Thresholds. If Kleinfelder finds concentrations to be <br />below applicable levels, Kleinf elder will recommend no further action. <br />Groundwater concentrations above EPA Tap Water and/or Tier 1 Groundwater ESLs and <br />soil concentrations above Industrial Thresholds. If Kleinfelder finds concentrations to <br />20173951.001A/SAC17R68420 Page 23 of 26 November 2, 2017 <br />C) 2017 Kleinfelder www.kleinfelder.com <br />KLEINFELDER 2882 Prospect Park Dr Suite 200, Rancho Cordova, CA 95670 p 1916.366-1701 f 1916.366-7013