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' Attachment 1 contd. <br /> V-) <br /> Roeks'consultants, Balbi &Chang Associates (BCA) and Leedshill-Herkenhoff Inc. <br /> (LH). <br /> Preliminary Site Assessment <br /> B; In April, 1988 BCA installed three soil bonngs TBI,TB2, and TB3 as shown in Figure <br /> 2 These bonngs were installed to determine the presence or absence of petroleum <br /> hydrocarbon contamination at this site Soil sample from TB 1 at a depth of 2 feet in <br /> the area of the tank excavation contained a maximum of 196 mg/kg of Total Petroleum <br /> Hydrocarbons. In an attempt to remediate this site, sods were excavated to a depth of <br /> about 4 feet and stockpiled on site <br /> Balbi &Chang Associates' April 1988 site assessment was performed without <br /> regulatory approval and oversight. Therefore, an approved follow-up investigation <br /> was conducted in April 1989 by Balbi &Chang Associates. This work consisted of <br /> four additional soil bonngs which indicated the presence of trace to non-detectable <br /> levels of petroleum hydrocarbon constituents Three of the four bonngs were <br /> converted into monitoring wells MW2 contained BTEX concentrations between 3 to <br /> 13 mg/1 and a TPH concentration of 110 mg/kg The other two wells contained trace <br /> to non-detectable levels of BTEX and TPH <br /> Two other site investigations were conducted by LH in January 1990 and September <br /> 1990 This site work resulted in a total of eight additional soil borings and three <br /> monitoring wells During LH's first site investigation, seven soil bonngs and two <br /> monitoring wells installed Analytical testing performed on the collected soil samples <br /> boring TB5 indicated TPH at a maximum of 12,000 ppm in the soils at a depth of <br /> about 15 feet in the northwest corner of the site <br /> All of the drill cuttings from both the previous consultant's site work was segregated <br /> by soil bonngs/well and labeled and contained in 55-gallon drums on the property <br /> Subsequent to these investigations, soils from the drums filled by BCA and the <br /> stockpile of excavated soils have been analyzed for TPH and BTEX This analyses <br /> indicated trace to non-detectable TPH and BTEX In September 1992, Kennedy/Jenks <br /> Consultants (KJC) collected four sidewall samples from the excavation Analyses of <br />{ <br />