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hydrocarbons In excess of detection limits were tound in the soil beneath the tanks <br /> These two USTs were repriced with two above ground tanks <br /> In F'ebru<<ry 1991, Roy F Weston, Inc (Weston) conducted an additional <br /> assessmcrit 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 tend were <br /> detected In soil samples from all four borings while xylenes were detected in soil <br /> samples trorn three of the, flour borings Benzene, xylenes, and total petroleum <br /> ' hydrocarbons in the gasoline range (TPH-g) were detected in MW-1 Petroleum <br /> hydrocaibons in excess at detection limits were not identified in the groundwater <br /> from any other monitoring well <br /> Weston conducted quarterly monitot Ing 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 in additional <br /> assessment of the site that included the collection of groundwatei samples from seven <br /> ' HydroPunch 11" locations (HP-1, HP-2 HP-3, HP-4 HP-5 FIP-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 /> MPetioleum hydrocarbons vete not detected in groundwater simples 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 Grocndwaier Monitoring Report, submitted to the SJCPHS <br /> ' Environmental Health Division in October 1993, and the Dtaft AdduLOW11 Site <br /> Assessment and Remedial Options Repoil, 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 third quarter 1994 Reports have been submitted for each <br /> ' monitoring event through the second quarter 1994 The third quarter 1994 <br /> monitoring was conducted on August 29, 1994 Procedures and results for this event <br /> ' are described in Section 4 0 of this report <br /> 94R8 111tit Bay V[uniwpol utility DsstrtLt <br /> 4042960013idcltt env 2 Stockton sLIV]CC Center rhsrd Quarter 1994 <br />