ARCHIVED REPORTS SOIL AND GROUNDWATER INVESTIGATION REPORT

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' Soil and Groundwater Investigation Report Tracy Byron Road Project May 2008 SAIC concluded the following based on review of the investigation data: • Soil and groundwater near borings SB-2, SB-3, and SB-6 were not fully characterized and the lateral extent of these affected media was not known. Further investigation near these borings 1was deemed necessary. • Soil and groundwater near borings SB-8 through SB-12 were not fully characterized and the lateral extent of these affected media was not known, and therefore required further assessment. ' • Soil and groundwater appeared to be delineated in the area of borings SB-13 through SB-16; therefore,additional investigation was not necessary. ' • Affected soil and groundwater in the vicinity of borings SB-19, SB-22 through SB-26, and SB-36 were not fully delineated and the lateral extent of residual hydrocarbons was unknown;therefore further assessment was required. ' • Affected soil and groundwater were present near borings SB-28, SB-30,and SB-33 through SB-35. Additional assessment was warranted near these borings. ' SAIC recommended advancement of additional step-out borings in the above-referenced areas to fully delineate affected soil and groundwater south of West Byron Road. SAIC recommended that soil and grab groundwater samples be collected from the step-out borings and tested by a laboratory for the COCs. ' The RWQCB reviewed the data presented in the Soil and Groundwater Investigation Report at Tracy Byron Road Project, Tracy, California,concurred with SAIC's recommendations for additional step-out borings, and suggested the following boring locations(RWQCB, 2004a): ' • Boring SB-37 south of and midway between SB-2 and SB-3; • Boring SB-38 south of SB-6; ' • Borings SB-39 and SB-40 diagonally southwest and southeast of SB-8; • Boring SB-41 south and midway between SB-11 and SB-12; • Boring SB-42 south of SB-19; • Boring SB-43 south of SB-23; ' • Boring SB-44 south of SB-25 (Caledron's General Store property);and • Boring SB-45 southeast of SB-33 within the area occupied by a storm-water basin. 3. SCOPE OF WORK Section 2.5 documented that access was available only for proposed borings SB-37 through SB-41. SAIC implemented the RWQCB-accepted work plan at the remaining locations as described in sections 3.1 to 3.3. 3.1 PERMITTING,ACCESS,AND SITE SAFETY ' To maintain regulatory and legal compliance,protect the health of all involved persons, and prevent accidents, SAIC implemented the following: ' • Completed strategic planning and project setup activities, including the site-specific Health and Safety Plan, site-specific Journey Management Plan, and the clearance of subsurface utilities. • Determined the ownership of and obtained access to private properties coincident with this scope of work to the extent possible within a reasonable time frame. 4 From Science to Solulians