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Tracer Research Corporation <br /> 1.0 HAMMER LANE INVESTIGATION <br /> Tracer Research Corporation (Tracer Research) performed a shallow soil gas <br /> and groundwater investigation at West Hammer Lane in Stockton, California. The <br /> investigation was conducted on April 29, 1992, for RESNA. <br /> 1.1 Objective <br /> The purpose of the investigation was to evaluate the extent of possible <br /> subsurface contamination by screening shallow soil gas and groundwater for the <br /> presence of volatile organic chemicals (VOCs). Soil gas and groundwater samples <br /> were collected and analyzed for the following hydrocarbons. <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX) <br /> total volatile hydrocarbons (TVHC) <br /> 1.2 Overview of Results <br /> For this investigation, seven soil gas and six groundwater samples were <br /> collected from 10 locations. Low concentrations of TVHC were detected in both soil <br /> �. gas and the groundwater samples. <br /> 2.0 SrM DESCRIPTION <br /> The subsurface of the site of the soil gas and groundwater investigation was <br /> sandy clay to clayey sand interbedded with clays. According to RESNA's <br /> representative, groundwater is 15 to 18 feet below ground surface (bgs) and flows east <br /> to southeast. <br /> 3.0 SOIL GAS SAMPLING PROCEDURES <br /> ' Soil gas sampling probes consisted of 7- to 14-foot lengths of 314-inch <br /> diameter hollow steel pipe. The probes were fitted with detachable drive tips and <br /> pushed and pounded to depths of 9 to 14 feet bgs. <br /> The aboveground end of each probe was fitted with an aluminum reducer <br /> (manifold) and a length of polyethylene tubing leading to a vacuum pump. Soil gas <br /> was pulled by the vacuum.pump into the probe. Samples were collected in a glass <br /> May 22. 1992 Page 1 1-92-358 <br />