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,0/1/0-1 <br /> Work Plan <br /> Limited Phase II Soil Sampling <br /> Marlette Road <br /> Stockton, California <br /> Tetra Tech EM, Inc. (Tetra Tech) is in the process of performing a Phase 1 Environmental Site <br /> Assessment (ESA) of the Marlette Road property, located east of Marlette Road in Stockton, San <br /> Joaquin County, California. The property currently consists of a rural residence, associated <br /> outbuildings,a barn,and agricultural land. <br /> The Phase I assessment revealed evidence of staining on surface soils under the dispenser end of <br /> two leaking, portable aboveground storage tanks (AST). Two additional stationary ASTs are also <br /> of concern due to their length of time on-site. As a precautionary measure, Tetra Tech will collect <br /> soil samples from the each of the identified areas and analyze the soil for total petroleum <br /> hydrocarbons. Photo Ionization Detector(PID)readings will also be recorded at specified intervals. <br /> At the dispenser location of each of the two leaking ASTs, and the two stationary ASTs, one soil <br /> boring will be advanced by direct push GeoProbe to approximately 15 feet bgs. Samples will be <br /> collected and PID readings will be recorded at two-foot intervals. Step out soil borings will be <br /> advanced 10 feet north, south, east, and west of the first soil boring. Selected samples will be <br /> collected based on PID results until PID readings suggest the soil is not affected. The samples <br /> will be analyzed for Total Petroleum Hydrocarbons (TPH) - Carbon Chain (C6 — C40) by EPA <br /> Method 8015 and benzene, toluene, ethylbenzene, and xylenes (BTEX) and oxygenates by EPA <br /> Method 8260. <br /> The soil from each boring will be spread out on-site in the areas from where they originated to a <br /> thickness of less than one inch. Each soil boring will be backfilled with grout or Quickerete. <br /> The results of the investigation will be documented in a Phase II ESA report. <br />