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®:M PEA Work Plan ■a H■e■ H a Martin Metals Finishing Inc. (Former) Stockton, California ■ Soil samples to be collected at target depths$of 5 ft bgs, 10 ft bgs and 15 ft bgs. ■ Soil vapor samples to be collected via dual-nested soil vapor wells installed to target depths of 5 ft bgs and 15 ft bgs. • MMF-SV-06 through MMF-SV-09: delineate concentrations of COPCs in subsurface soil vapor north of the MMF building in the vicinity of the storm drain. ■ Soil vapor samples to be collected via dual-nested soil vapor wells installed to target depths of 5 ft bgs and 15 ft bgs. • MMF-SS-06, MMF-SS-07, MMF-SS-08, MMF-SS-09, MMF-SS-10, and MMF-SS-11: assess concentrations of COPCs in subsurface soil in the paved area north of the MMF building and downgradient of the old stormwater outfall, adjacent to and along the stretch of storm drain leading from the MMF building to Mormon Slough. ■ Soil samples to be collected at target depths of 5 ft bgs, 10 ft bgs and 15 ft bgs. • MMF-SS-12A, MMF-SS-13A, MMF-SS-14A, MMF-SS-15A, and MMF-SS-16A: assess concentrations of COPCs in shallow soil on the northern bank of Mormon Slough east of, beneath, and west of the storm drain outfall. ■ Soil samples to be collected at target depths of 6 inches below ground surface (bgs), 1.5 ft bgs, and 3 ft bgs.9 ■ Soil samples from MMF-SS-12A and MMF-SS-16A will be held at the laboratory, pending results of the other shallow soil samples on the northern bank of Mormon Slough. • MMF-SS-12B, MMF-SS-13B, MMF-SS-14B, MMF-SS-15B, and MMF-SS-16B: assess concentrations of COPCs in shallow soil in Mormon Slough east of, beneath, and west of the storm drain outfall.10 ■ Soil samples to be collected at target depths of 6 inches bgs, 1.5 ft bgs, and 3 ft bgs. ■ Soil samples from MMF-SS-12B and MMF-SS-16B will be held at the laboratory, pending results of the other Mormon Slough samples. • MMF-SS-12C, MMF-SS-13C, MMF-SS-14C, MMF-SS-15C, and MMF-SS-16C: assess concentrations of COPCs in shallow soil on the southern bank of Mormon Slough east of, beneath, and west of the storm drain outfall. ■ Soil samples to be collected at target depths of 6 inches bgs, 1.5 ft bgs, and 3 ft bgs. ■ Soil samples from MMF-SS-12C and MMF-SS-16C will be held at the laboratory, pending results of the other shallow soil samples on the southern bank of Mormon Slough. 8 Target depth indicates the bottom of an approximately 6-inch sample (e.g., a sample with target depth of 1.5 ft bgs will be collected between 1 and 1.5 ft bgs. 9 Samples collected in Mormon Slough at 3 ft bgs will be held by the analytical laboratory pending analysis, dependent on the results of shallower samples. 10 If the center of Mormon Slough is saturated, sample locations will be moved south of the center line of the Slough, towards the storm drain outfall, until dry sediment or soil is observed. CDIM—Fairgrounds Industrial Park Page 11