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TABLE OF CONTENTS (Continued) 3.2.4.2 Groundwater Sampling Procedures...................................................................26 3.2.5 Soil Sampling Strategy.....................................................................................................27 3.2.5.1 On-Site Soil Sampling.......................................................................................28 3.2.5.2 Background Soil Sampling................................................................................28 3.2.6 Soil Gas Sampling Strategy..............................................................................................29 3.2.7 Groundwater Sampling Strategy.......................................................................................29 3.3 DEVIATIONS FROM THE WORKPLANS ................................................................................29 3.4 HEALTH AND SAFETY MONITORING...................................................................................30 3.5 DISPOSAL OF INVESTIGATION DERIVED WASTE.............................................................30 4.0 ANALYTICAL RESULTS .....................................................................................................32 4.1 SOIL...............................................................................................................................................32 4.1.1 Polycyclic Aromatic Hydrocarbons..................................................................................32 4.1.2 Total Petroleum Hydrocarbons.........................................................................................33 4.1.3 Title 22 Metals..................................................................................................................33 4.1.4 Volatile Organic Compounds ...........................................................................................34 4.1.5 Geotechnical Investigation................................................................................................34 4.1.6 Background Investigation.................................................................................................34 4.2 SOIL GAS......................................................................................................................................34 4.2.1 Volatile Organic Compounds ...........................................................................................35 4.3 GROUNDWATER........................................................................................................................36 4.3.1 Polycyclic Aromatic Hydrocarbons..................................................................................36 4.3.2 Total Petroleum Hydrocarbons.........................................................................................36 4.3.3 Title 22 Metals..................................................................................................................36 4.3.4 Volatile Organic Compounds ...........................................................................................37 4.4 DELINEATION OF MGP/UST RELATED IMPACTS...............................................................37 4.4.1 AOI 1 ................................................................................................................................38 4.4.2 AOI 2................................................................................................................................38 4.4.3 AOI 3 ................................................................................................................................39 4.4.4 AOI 4................................................................................................................................39 4.4.5 AOI 5 ................................................................................................................................40 4.4.6 AOI 6................................................................................................................................41 4.5 SPCC CONTAINMENT STRUCTURE EXCAVATION............................................................41 4.6 DATA QUALITY..........................................................................................................................43 4.6.1 Data Validation.................................................................................................................43 5.0 HUMAN HEALTH RISK ASSESSMENT.............................................................................44 6.0 SUMMARY, CONCLUSIONS AND RECOMMENDATIONS............................................45 6.1 SUMMARY...................................................................................................................................45 6.2 CONCLUSIONS ...........................................................................................................................47 6.3 RECOMMENDATIONS...............................................................................................................48 7.0 REFERENCES ........................................................................................................................49 PARSONS 111 FINAL RI REPORT-FORMER TRACY MGP APRIL 2010