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L Removal of 10,000 -Gallon Diesel UST System (1989) LT A 10,000 -gallon diesel UST system was also located near the southwestern comer of the main building. The UST system was removed for permanent closure in September 1989 (Campbell Taggart, Inc., 1989). Two soil samples (AA -1561 and AA -1562) were collected beneath the former tank at a depth of approximately 13 feet BGS. Total petroleum hydrocarbons quantified V as gasoline (TPH-g), total petroleum hydrocarbons quantified as diesel (TPH-d), and benzene, toluene, ethylbenzene and xylenes (BTEX) were not detected in the samples. Soil sample AA -1563 was collected beneath the former dispenser at the fuel pump island at a depth of approximately 3.25 feet. Sample AA -1563 contained TPH-g at 89 mg/kg and TPH-d at 520 mg/kg. However, the laboratory noted that the hydrocarbons detected in the diesel range did not match a diesel standard. The BTEX compounds were not detected in soil sample AA -1563. L Removal of 20,000 -Gallon Diesel UST System (1989) V A 20,000 -gallon diesel UST system was located on the eastern side of the building and was used to fuel the bakery ovens. The UST system was removed for permanent closure in 4 September 1989 (Campbell Taggart, Inc., 1989). The analytical data for soil samples collected from the excavation of the UST system indicated no environmental issues. Removal of 1,000 -Gallon Diesel UST System (1996) A 1,000 -gallon diesel UST system was located on the western side of the building and was used to supply fuel to a boiler. The UST system was removed for permanent closure in February 1996 (PSC, 1996). The analytical data for soil samples collected from the excavation of the UST system indicated no environmental issues. L' 2.5.2 Subsurface Investigations, Remediation, and Monitoring y The following subsections summarize information pertaining to investigation, remediation, and monitoring activities performed at the Site. L" Subsurface Investigations (1987 through 1994) LW In July and September 1987, ESE installed groundwater monitoring wells MW -1, MW -2, and MW -3. Between January 1988 and September 1990, ACG installed groundwater monitoring wells MW -4 through MW -8. In February 1990, ACG drilled soil borings 90-1 and 90-2. PSC Environmental Services (PSC) (formerly Burlington Environmental) installed wells MW -9 through MW -13 in March 1994, piezometers PZ -1 and PZ -2 in September 1994, and air 1. SL AIR SCM and RI WP 6 V W