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Work Plan Limited Phase II Soil Sampling McKee Property Lathrop, California Tetra Tech EM, Inc. (Tetra Tech) performed a Phase I Environmental Site Assessment (ESA) of the McKee property, located southwest of the corner of Louise Avenue and Manthey Road in Lathrop, San Joaquin County, California. The property currently consists of a rural residence, associated outbuildings,and agricultural land that appears to be fallow. The Phase I assessment revealed evidence of staining near an on-site shed and under the dispenser end of two elevated ASTs. As a precautionary measure, Tetra Tech will collect soil samples from the each of the identified areas and analyze the soil for total petroleum hydrocarbons. In the area of the ASTs, one soil boring will be advanced by hand auger to 4 feet. Step out soil borings will be advanced 10 feet north, south, east, and west of the ASTs. Samples will be collected at 1-foot and 4-foot depths below ground level at each boring. Photo Ionization Detector (PID) readings will be recorded at 1-foot intervals. Each boring will be advance to 6 feet and a PID reading will be collect at that depth. The samples will be analyzed for Total Petroleum Hydrocarbons (TPH) - Carbon Chain (C6 —C40) by EPA Method 8015 and benzene, toluene,ethylbenzene, and xylenes(BTEX) and oxygenates by EPA Method 8260. In the area of the shed, one soil boring will be advanced by hand auger to 4 feet in the middle of the stained area. Step out soil boring locations will also be advance 10 feet in two different directions away from the stained area. Samples will be collected at 1-foot and 4-foot depths below ground level at each boring. PID readings will be recorded at 1-foot intervals. Each boring will be advance to 6 feet and a PID reading will be collect at that depth. The samples will be analyzed for TPH by EPA Method 8015 and BTEX and oxygenates by EPA Method 8260. The soil from each boring will be spread out on-site in the areas from where they originated to a thickness of less than one inch. Each soil boring will be backfilled with grout or Quickcrete. The results of the investigation will be documented in a Phase II ESA report.