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10/04/1999 12:22 2094671 AGE STQCTON PAGE 04 23 August 1999 AGE-NC Project No. 99-0611 Page 3 of 5 Samples for TPH-d,TPH-mo,and chlorinated hydrocarbon analyses were collected in laboratory- supplied,l-liter amber bottles.The labeled vials and bottles were placed in a chilled container under ice and transported under chain-of-custody to a DHS-certified laboratory- 3.0. FINDINGS Soil descriptions (lithologies), were determined from field data. Hydrocarbon impact in soil and groundwater was characterized from field and laboratory analytical data. Laboratory reports for groundwater analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation are presented in Appendix B. 3.1. SOIL PROFILE A light brown to dark brown, damp, silty clay/sandy clay and a dark brown to black, damp, ashl charcoal was encountered from the surface to depths of approximately 5 feet bsg. A brown to dark brown, damp, clay, with high plasticity and trace amounts of medium sand was encountered at depths of 10 feet bsg. A grey to brown,damp,silty clay,with medium to high plasticity and trace amounts of dark brown mottling was generally found at 15 feet bsg.A grey to brown,wet,silty clay, of medium plasticity with trace amounts of dark brown mottling was encountered at depths of 20 feet bsg. Boring logs are included in Appendix A. 3.2. FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL AND GROUNDWATER Organic vapor was detected utilizing a OVK PID in soil samples B1-15', B3-10', and B4-21' at concentrations as high as 37 ppm,4 ppm,and 1.5 ppm,respectively.Hydrocarbon odor was detected in the three samples and noted on the boring logs.A strong hydrocarbon odor was noted for sample B1-W. The liquid sample B2-L collected from the discovered UST also had a strong hydrocarbon odor_ 3.3. RESULTS OF SOIL,GROUNDWATER, AND LIQUID SAMPLE ANALYSIS Select soil samples from borings B1,B3,and B4 were submitted for analysis for TPH-g,TPH-d, TPH-mo, BTEX, and chlorinated hydrocarbons. The laboratory results reported petroleum hydrocarbons TPH-g,TPH-d,and TPH-mo in sample B1-15'at concentrations as high as 57 ppm, 280 ppm, and 360 ppm, respectively. TPH-d and TPH-mo was detected in soil sample 134-21' at concentrations of 51 ppm and 91 ppm,respectively. BTEX and chlorinated hydrocarbons were not Advanvat GeoEnvironmento,Inc.