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23 August 1999 <br /> AGE-NC Project No. 99-0611 <br /> Page 4 of 5 <br /> Grab groundwater sample B 1-13' from boring B I was submitted for analysis for TPH-g, TPH-d, <br /> TPH-mo, BTEX, and chlorinated hydrocarbons. The laboratory results reported petroleum <br /> hydrocarbons TPH-d and TPH-mo at concentrations as high as 37.000 ppb and 69,000 ppb, <br /> respectively. TPH-g, BTEX, and chlorinated hydrocarbons were not detected in sample B1-13'. <br /> One liquid grab sample was collected from the discovered UST and analyzed for TPH-g, TPH-d, <br /> TPH-mo, BTEX, and chlorinated hydrocarbons. The laboratory results reported TPH-g and TPH-d <br /> at concentrations of 110,000 ppb and 51,000 ppb, respectively. Toluene and Benzene were detected <br /> at concentrations as high as 18,000 ppb and 10,000 ppb, respectively. Chlorinated hydrocarbons <br /> were detected at concentrations as high as 2,200 ppb. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on data collected during the 30 July 1999 Preliminary Site Assessment, AGE concludes: <br /> • Field observations, OVM readings, and laboratory analysis indicate that the most intense <br /> hydrocarbon impact to soil is in the area of borings B 1 and B4. The laboratory results <br /> indicate a hydrocarbon range of diesel and motor oil. <br /> • Laboratory analysis of the groundwater sample indicates high concentrations of hydrocarbon <br /> impact in the area of B 1. The analytical results indicate a carbon range of diesel and motor <br /> oil. <br /> • One UST was discovered during the advancement of boring B2. Laboratory data of the <br /> contents sampled from the UST confirmed the presents of gasoline. <br /> • Petroleum hydrocarbons were encountered in both former fuel tank locations and in the two <br /> areas of disturbed concrete. <br /> 5.0. RECOMMENDATIONS <br /> Based on the data collected during the 30 July 1999 Preliminary Site Assessment, AGE <br /> recommends: <br /> • Further subsurface evaluation to determine lateral and vertical extent of petroleum <br /> hydrocarbon impact to soil and groundwater in the four areas investigated. <br /> • UST removal and evaluation of tank area,further investigation of fuel tank areas near B3 and <br /> B4. <br /> Advanced GcoEnvironmcntal,Inc. <br />