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' 3291 S.Highway 99 Page 2 <br /> Soil Boring Installation <br /> ' GPE Project 471.2 <br /> August 17,2007 <br /> ' septic sewage system. To further investigate the impact to the soil in the <br /> vicinity of the septic tank, a total of 6 soil borings were installed in the <br /> vicinity of the septic tank and leach field. The sample results suggested that <br /> the soil had not been impacted with elevated concentrations of lead <br /> associated with soldering circuit boards. The circuit board washer was <br /> removed from the premises and the sewer connections were plugged to <br /> prevent the possibility that additional releases could occur. Other chemical <br /> analyses in 1993 and 1994 indicated that slightly elevated concentrations of <br /> phenol, toluene, and chloromethane were detected in the septic tank water. <br /> It was concluded that these materials had entered through a sink drain. In <br /> 1996 or 1997, the septic tank and leach lines were reportedly removed and <br /> replaced. <br /> The purpose of this assessment is to collect soil samples from beneath the leach <br /> ' field and submit them for laboratory testing to obtain additional confirmation <br /> that the soil does not contain residual contaminants at concentrations that could <br /> be hazardous to human health. <br /> 1.2 Scope of Work <br /> 'I To accomplish the goal of assessing environmental conditions in the vicinity of <br /> the leach field, the following work will be completed: <br /> ' 1. Install two (2) Geo-Probe soil borings through the leach field to a depth of 25 <br /> feet below grade. <br /> 2 Test soil samples for the presence of contaminant heavy metals (CAM-17) <br /> volatile organic compounds, (VOCs) and semi-volatile organic compounds <br /> (S-VOCs). <br /> 3 Collect and test as sample of water from the on-site domestic water well. <br /> 1 <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 <br /> Modesto, Ca 95356 Fax: (209) 569-0295 <br />