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r..� Project No. 034-98081 <br /> Page No. 4 <br /> within the former UST pit area. Boring BI was located northerly of B I a within the southerly portion of <br /> the former UST area as shown site drawings. Boring B1 was advanced to a total depth of 20 feet. <br /> Analytical data is presented in Table I. <br /> 'I <br /> Based on the results of the January 14, 1998 drilling and sampling activities, four additronal borings P 1 <br /> + P2,P3, and P4)were advanced on the site on February 2, 1998. The additional borings were advanced to <br /> ...LLL...... � i <br /> depths ranging from 20 to 40 feet using direct push (Geoprobe(D) equipment. The locations of these <br /> borings are shown on Figure 2. i <br /> 1i <br /> The exploratory borings revealed generally unifonn subsurface conditions characterized by clayey fill <br /> materials underlain by fine-grained, variably-cemented, cohesive native deposits. . Each boring <br /> encountered an approximate eight-inch thick pavement section consisting of asphaltic concrete over <br /> aggregate,base materials. Below the pavement materials, the borings typically encountered soft to F <br /> medium stiff fill materials consisting of dark brown-grey silty clay extending to depths ranging from two <br /> feet and four feet. In Boring P2, the fill materials extended to a depth of approximately nine feet; this <br /> boring appears to be within the former UST pit. Below the fill materials, native, stiff to hard light- <br /> brown fine sandy clayey silts were encountered. The silt deposits were variably cemented with depth <br /> and extended to the maximum depth of exploration (40 feet). Groundwater was not encountered within <br /> �f <br /> the borings. <br /> f <br /> ! E <br /> Field-screening for olfactory evidence of petroleum hydrocarbons as well as PID screening indicated that <br /> i <br /> portions of the soil profile within Borings P2 (between depths of;five and 25 feet) and P3 (at a depth of <br /> 20)exhibited field evidence of PHC soil impact. <br /> The collected samples were analyzed for benzene, toluene, ethyl benzene, and xylenes (BTEX) by EPA ` <br /> a Method 8020, total petroleum hydrocarbons as gasoline (TPH-G)by EPA Method 8015M, and total lead. <br /> r Table I (following text) presents the results of the chemical analyses performed on the submitted soil <br /> samples. <br /> Based on the results of the soil assessment investigation, it appeared the former UST was located in the <br /> vicinity of Boring P2, and that relatively low, residual concentrations of petroleum hydrocarbons are <br /> present in soils in this area. . The analytical data established both horizontal and vertical attenuation of <br /> Al <br /> s KRAZAN & ASSOCIATES,INC. <br /> Offices Serving the Western United States <br /> 3498081.WP <br />