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Geofogica(Technics Inc. <br /> ' 2741 River Road <br /> Modesto,Ca(ifomia 95351 <br /> (209)538-6424/jax#538-5852 <br /> 1 <br /> REPORT <br /> ' ADDITIONAL <br /> SOIL & GROUNDWATER INVESTIGATION <br /> ' onzia <br /> APIN 233-460-07 <br /> 5011'. Acacia St. <br /> ' Trac 7, California <br /> Proj e ct No. 774.2 <br /> ' June 10, 1999 <br /> ' EXECUTIVE SUMMARY <br /> In 1995 the former Fortifiber facility was closed and several site closure cleanup activities <br /> ' were performed, including removal of stained soil by excavation. At that time groundwater <br /> was at approximately 12 feet below ground surface (bgs), so excavation in the former Storage <br /> Area extended to a depth of 12 feet. Currently groundwater is approximately 6 feet bgs. The <br /> soil cleanup in 1995 removed most of the ontamination; however, subsequent investigation <br /> ' test data shows that some residual motor of and diesel contamination does still exist. <br /> In December 1998, and March and May 1999, three soil and groundwater investigation <br /> ' events was performed. The test results indicate that the soil remediation of 1995 effectively <br /> removed the source of oil in the soil at the Former Storage Area. <br /> This report summarizes the work perfornied during these three investigations and draws <br /> ' conclusions as to the significance of the residual contamination still present on this property. <br /> A total of 17 GeoProbe boreholes, 2 soil borings and 10 hand auger boreholes have been <br /> ' drilled. A total of 56 soil samples and 21 groundwater samples have been analyzed for <br /> TEPH-D & MO, TPH-G, BTEX, and Solvents. Only 7 soil samples contained detectable <br /> contamination, mostly motor oil compoun s. 13 groundwater samples contained detectable <br /> ' contamination, also mostly motor oil. A trace amount of BTEX compounds were detected in <br /> 3 groundwater samples. No Solvents were detected. The five metals were tested for in <br /> several boreholes and the test results show that the metals in the contaminated area are within <br /> ' the range found in the background sample. <br /> There appears to be two areas of concern which contain residual hydrocarbon contamination <br /> in the soil and groundwater: <br /> II <br />