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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 off-site vadose zone conditions at Lodi Iron Works property where <br /> PRSG-7 8.5 4.5-5.5 5.0 including soil removal occurred to depths of 3 and 5 feet bgs, and low level benzene, <br /> 7.5-8.5 8.0 naphthalene toluene, and naphthalene residues occur in soil between 3.0 and 5.0 feet bgs <br /> (TO-15) feet bgs. <br /> VOCs Evaluate off-site vadose conditions at Lodi Iron Works at south limit of <br /> PRSG-8 8.5 4.5-5.5 5.0 including excavation where soil removal occurred to depths of 3 and 5 feet bgs, and <br /> 7.5 -8.5 8.0 naphthalene low level naphthalene residues occur in soil at 1.5 feet and 6.0 feet bgs. <br /> (TO-15) <br /> Notes: <br /> 1.Ten Percent of the samples submitted to the analytical laboratory will be analyzed for helium using ASTM D946. <br /> 2. Duplicate(or replicate)soil gas samples will be collected and analyzed at a minimum rate of one per 20 samples or one per day,whichever is greater. <br /> BTEX=benzene,toluene,ethylbenzene,and xylenes <br /> CPAH=carcinogenic polycyclic aromatic hydrocarbons <br /> feet bgs=feet below ground surface <br /> MGP=manufactured gas plant <br /> PRSG=post-remediation soil gas <br /> TPH=total petroleum hydrocarbons <br /> VOCs=volatile organic compounds <br /> ERRA PACIFIC GROUP Page 3 of 3 <br />