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i <br /> hydrocarbons in excess of detection limits 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 borings 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 bonngs 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 MW-1 Petroleum <br /> hydrocarbons in excess of detection limits were not identified in the groundwater <br /> from any other monitoring well. <br /> Weston conducted quarterly monitoring of the groundwater monitoring wells for <br /> the second and third quarters of 1992 and the first and second quarters of 1993 <br /> ' Benzene, toluene, xylenes, and TPH-g were detected only in MW-1 during these <br /> sampling events <br /> ' In 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) Petroleum <br /> hydrocarbons were detected in groundwater from HP-1, HP-4, HP-5, and MW-8 <br /> ' Petroleum hydrocarbons were not detected in groundwater samples collected from <br /> HP-2, HP-3, HP-7, or MW-9 Soil samples were collected during the installation of <br /> ' MW-8 and MW-9 Soil samples from MW-8 contained levels of petroleum <br /> hydrocarbons in excess of detection limits The assessment activities and analytical <br /> ' results from the soil and groundwater sampling are presented in the Draft Third <br /> Quarter 1993 Groundwater Monitonng Report, submitted to the SJCPHS <br /> Environmental Health Division in October 1993, and the Draft Additional Site <br /> ' Assessment and Remedial Options Report, submitted to the SJCPHS Environmental <br /> Health Division in January 1994 <br /> ' Waste Science conducted quarterly monitoring at the site from the fourth quarter <br /> 1993 through the fourth quarter 1994 Reports have been submitted for each <br /> ' monitoring event through the third quarter 1994. The fourth quarter 1994 <br /> monitoring was conducted on November 14, 1994 Procedures and results for this <br /> event are described in Section 4 0 of this report <br /> ' 95R2 Fast Bay Municipal Utility District <br /> 40429600\4thgtr gw 2 Stockton Service Center-Fourth Quarter 1994 <br />