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Report for Monitor WAJ91ing and Groundwater Investigation <br /> Pilkington North America <br /> July 23,2003 <br /> Page 4 <br /> INVESTIGATION RESULTS <br /> Field Observations <br /> No petroleum hydrocarbon odors were noted in purge water from the monitor wells, emanating from the <br /> installed borings, or in any of the groundwater and soil samples collected from either UST site. Soil <br /> encountered in the borings installed at the 1997 UST removal site consisted primarily of poorly graded <br /> sand,ranging from very fine to medium grained, with silt content ranging from about I to 10 %per unit <br /> weight. The field operated photo-ionization detector (PID) did not detect organic vapor at or above the <br /> instrument detection limit in any of the soil or groundwater samples collected at the 1997 UST removal <br /> site. Groundwater was encountered at the 1986/1987 UST removal site in MW-17 and MW-18 at <br /> approximately 10 feet below grade and at approximately 14 below grade in the borings installed at the <br /> 1997 UST removal site. <br /> Groundwater Gradient <br /> Groundwater elevation data for the 1986/1987 UST removal site are shown in Table 1, below. The <br /> groundwater elevation data indicates that the groundwater gradient was 0.0037 foot/foot to the southwest <br /> on July 9, 2003.The groundwater gradient is shown in Figure 5,Attachment A. <br /> TABLE 1 —Groundwater Elevation Data(July 9,2003) <br /> Monitoring Well Collar Elevation Depth To Water Groundwater Elevation <br /> Well <br /> W-3 16.73 13.84 2.89 <br /> W-4 18.66 15.51 3.15 <br /> MW-17 11.82 10.07 1.75 <br /> MW-18 11.72 10.00 1.72 <br /> All measurements are in feet. <br /> Laboratory Analytical Results <br /> Laboratory analytical results of the soil samples collected from GP-1 through GP-4 at the 1997 UST <br /> removal site are shown in Table 2, on the.next page.The laboratory analytical results indicate that none of <br /> the constituents were detected in any of the soil samples at or above the laboratory reported detection <br /> limits. The laboratory report for the soil samples, including certificates of analysis and the chain of <br /> custody record,is in Attachment C. <br /> I <br /> �I <br /> i <br /> i <br /> 1 { ' <br /> 4M <br /> is CONDOR <br />