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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 zone conditions below removed in-ground holder <br /> PRSG-4 15.5 4.5-5.5 5.0 including source area where low level benzene and naphthalene residues occur in soil <br /> 14.5- 15.5 15.0 naphthalene at 29 feet bgs, and where benzene and naphthalene was detected at pre- <br /> (TO-15) remediation soil gas well SG-14 at depths of 5.25 and 14.75 feet bgs. <br /> VOCs Evaluate on-site vadose zone conditions in south half of Site in area on east <br /> PRSG-5 14.5 6.5 - 7.5 7.0 including side of former gas holder where naphthalene and toluene residues occur <br /> 13.5- 14.5 14.0 naphthalene between 6.0 and 10.0 feet bgs and benzene residues occur at 14 feet bgs at <br /> (TO-15) bottom of removed former MGP vertical pipe <br /> VOCs Evaluate on-site vadose conditions in the southeast quadrant of the Site in <br /> PRSG-6 15.5 4.5-5.5 5.0 including the footprint of the former lampblack separators where naphthalene residues <br /> 14.5- 15.5 15.0 naphthalene occur in soil at depths ranging from 3.5 to 20 feet bgs. <br /> (TO-15) <br /> o .. ERRA PACIFIC GROUP Page 2 of 3 <br />