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I lie sample collected from the north end of the excavation contained 13 parts per million (ppm) of total petroleum hydrocarbons as diesel TPH-D), and a sample collected from the pipeline trench ' contained 5 0 ppm TPH-D A groundwater sample collected from the excavation contained 130 parts per billion (ppb) of TPH-D (IT, 2002b) In September 2002, at the request of the SJCEHD, six direct-push soil borings were performed ' adjacent to the former 2,000-gallon diesel UST location evaluate soil and groundwater quality in the area Analysis of the soil samples detected TPH-D in one of the borings at a concentration of ' 2 7 ppm No benzene, toluene,ethylbenzene, and xylenes (BTEX) constituents or methyl tertiary butyl ether(MTBE) were detected in any of the soil samples (IT, 2002c) Groundwater was encountered during boring activities at depths ranging from I 1 feet to 14 feet bsg Analysis of groundwater samples collected from three of the borings detected TPH-D at concentrations ranging from 50 ppb to 390 ppb No BTEX constituents or MTBE were detected In the samples 1 In April 2003, a site conceptual model (SCM) was completed for the site by Shaw The results of the SCM indicate numerous UST systems existed on nearby properties The majority of these UST systems were located to the south, In the anticipated upgradient direction, with several of ' the UST systems reporting leaks, detected upon removal Based on the data, It is surmised that contaminants from these former UST systems may have impacted underlying groundwater conditions at the SBC site (Shaw, 2003) 2.0 Scope of Work The scope of work consisted of constructing and developing three groundwater monitoring wells in order to further evaluate groundwater quality at the site Following installation,the wells were ' developed and sampled as part of the new quarterly groundwater monitoring program initiated at the site ' CNCD/08 11-0310 SHAREfUST/03-0096 doe 2