Laserfiche WebLink
1 <br /> excess of detection limits in soil and groundwater in the vicinity of the former tank <br /> location This assessment included the installation of three groundwater monitonng <br /> wells, MW-1, MW-2, and MW-3, and four soil borings, B-1, B-2, B-3, and B-4 <br /> In September 1989, the District removed the two remaining USTs No <br /> indications of leakage from these tanks were observed and no petroleum <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 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 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 <br /> ' for 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, BVWST conducted an additional assessment <br /> of the site that included the collection of groundwater samples from seven <br /> ' HydroPunch 1�0 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 No <br /> petroleum hydrocarbons were detected in groundwater samples collected from HP-2, <br /> HP-3, HP-7, or MW-9 Soil samples were collected during the installation of MW-8 <br /> ' and MW-9 Soil samples from MW-8 contained levels of petroleum hydrocarbons in <br /> excess of detection limits The assessment activities and analytical results from the <br /> ' soil and groundwater sampling are presented in the Draft Third Quarter 1993 <br /> Groundwater Monitoring Report, submitted to the SJCPHS Environmental Health <br /> ' Division in October 1993, and the Draft Additional Site Assessment and Remedial <br /> Options Report, submitted to the SJCPHS Environmental Health Division in January <br /> 1994 <br /> BVWST conducted fourth quarter 1993 groundwater monitoring on December <br /> 16 and 17, 1993 Procedures and results for this event are described in Section 4 0 <br /> of this report <br /> 931122 Fast Bay Municipal Utility District <br /> 404296004thgtr gw 2 Stockton Service Center-Tburth Quarter 1993 <br /> 1 <br />