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Table 4 <br /> Proposed Soil Gas Sampling Program and Rationale <br /> Former Lodi MGP <br /> Lodi, California <br /> Proposed Total Depth Sand Pack Probe Tip Analysis <br /> Soil Gas of Borehole Interval Depth (EPA Rationale <br /> Well ID (feet bgs) (feet bgs) (feet bgs) Method) (1,2) <br /> VOCs Evaluate on-site vadose conditions at the northern property limit at 9-foot <br /> PRSG-1 9.5 4.5 - 5.5 5.0 including localized removed soil source area where low level naphthalene residues <br /> 8.5 -9.5 9.0 naphthalene <br /> (TO-15) occur in soil at 3 feet bgs. <br /> VOCs Evaluate on-site vadose conditions where elevated benzene was detected in <br /> PRSG-2 8.5 4.5 - 5.5 5.0 including pre-remediation soil gas well SG-1 at depths of 5 and 8 feet bgs, and where <br /> 7.5 - 8.5 8.0 naphthalene low level naphthalene and CPAH residues occur in soil on-site and in <br /> (TO-15) adjacent street between 0.5 and 3.5 feet bgs. <br /> VOCs Evaluate on-site vadose zone conditions in removed deep TPH soil source <br /> 4.5 - 5.5 5.0 including area at location northeast of removed in-ground holder where low level BTEX <br /> PRSG-3 15.5 14.5 - 15.5 15.0 naphthalene and naphthalene residues occur in soil between 5.0 and 25 feet bgs and <br /> (TO-15) where elevated benzene and naphthalene was detected at pre-remediation <br /> soil gas wells SG-7 and SG-8 at depths of 5.25 and 14.75 feet bgs. <br /> RRA GROUP Page 1 of 3 <br />