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hydrocarbons in excess of detection limns were found in the soil beneath the tanks <br /> These two USTs were replaced with two above ground tanks <br /> ' In February 1991, Roy F Weston, Inc (Weston) conducted an additional <br /> assessment of the site that included drilling four soil bonngs and completing each as <br /> monitoring wells (MW-4, MW-5, MW-6, and MW-7) Toluene and lead were <br /> ' detected in soil samples from all four borings while xylenes were detected in soil <br /> samples from three of the four borings Benzene, xylenes, and total petroleum <br /> ' hydrocarbons in the gasoline range (TPH-g) were detected in groundwater from <br /> MW-1 Petroleum hydrocarbons in excess of detection limits were not identified In <br /> ' the groundwater from any other monitoring well <br /> Weston conducted quarterly monitoring of the monitoring wells for the second <br /> ' and third quarters of 1992 and the first and second quarters of 1993 Benzene, <br /> toluene, xylenes, and TPH-g were detected only in MW-1 during these sampling <br /> events <br /> tIn August and September 1993, Waste Science conducted an additional <br /> assessment of the site that included the collection of groundwater samples from seven <br /> HydroPunch II"locations (HP-1, HP-2, HP-3, HP-4, HP-5, HP-6, and HP-7) and the <br /> installation of two groundwater monitoring wells (MW-8 and MW-9) The wells and <br /> ' HydroPunch I17 locations are shown on Figure 4-3 Petroleum hydrocarbons were <br /> detected in groundwater from HP-1, HP-4, HP-5, and MW-8. Petroleum <br /> hydrocarbons were not detected in groundwater samples collected from HP-2, HP-3, <br /> ' HP-7, or MW-9 Soil samples were collected during the installation of MW-8 and <br /> MW-9 Soil samples from MW-8 contained levels of petroleum hydrocarbons above <br /> ' detection limits The assessment activities and analytical results from the soil and <br /> groundwater sampling are presented in the Third Quarter 1993 Groundwater <br /> Monitonng Report, submitted to the SJCPHS Environmental Health Division in <br /> October 1993, and the Additional Site Assessment and Remedial Options Report, <br /> submitted to the SJCPHS Environmental Health Division in January 1994 <br /> ' Waste Science conducted quarterly monitoring at the site from the fourth quarter <br /> 1993 through the fourth quarter 1995. Reports have been submitted for each <br /> monitoring event through the fourth quarter 1995 The first semester 1996 <br /> morutoring was conducted on March 27, 1996 Procedures and results for this event <br /> ' are described in Section 4 0 of this report <br /> ' 96 R7 East Bay Municipal Utility Distnct <br /> 40429600\1stsem gw 2 Stockton Service Center-First Semester 1996 <br /> 1 <br />