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23 August 1999 <br /> AGE-NC Project No. 99-0611 <br /> Page 3 of 5 <br /> Samples for TPH-d, TPH-mo, and chlorinated hydrocarbon analyses were collected in laboratory- <br /> supplied, 1-liter amber bottles. The labeled vials and bottles were placed in a chilled container under <br /> ice and transported under chain-of-custody to a DHS-certified laboratory. <br /> 3.0. FINDINGS <br /> Soil descriptions (lithologies), were determined from field data. Hydrocarbon impact in soil and <br /> groundwater was characterized from field and laboratory analytical data. Laboratory reports for <br /> groundwater analyses, testing methods, laboratory quality assurance/quality control (QA/QC) <br /> reports, and sample chain of custody documentation are presented in Appendix B. <br /> 3.1. SOIL PROFILE <br /> A light brown to dark brown, damp, silty clay/sandy clay and a dark brown to black, damp, ash/ <br /> charcoal was encountered from the surface to depths of approximately 5 feet bsg. A brown to dark <br /> brown, damp, clay, with high plasticity and trace amounts of medium sand was encountered at <br /> depths of 10 feet bsg. A grey to brown, damp, silty clay, with medium to high plasticity and trace <br /> amounts of dark brown mottling was generally found at 15 feet bsg. A grey to brown,wet, silty clay, <br /> of medium plasticity with trace amounts of dark brown mottling was encountered at depths of 20 <br /> feet bsg. Boring logs are included in Appendix A. <br /> 3.2. FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL AND GROUNDWATER <br /> Organic vapor was detected utilizing a OVM, PID in soil samples B1-15', 133-10', and B4-21' at <br /> concentrations as high as 37 ppm,4 ppm,and 1.5 ppm,respectively. Hydrocarbon odor was detected <br /> in the three samples and noted on the boring logs. A strong hydrocarbon odor was noted for sample <br /> B 1-W. The liquid sample 132-L collected from the discovered UST also had a strong hydrocarbon <br /> odor. <br /> 3.3. RESULTS OF SOIL, GROUNDWATER, AND LIQUID SAMPLE ANALYSIS <br /> Select soil samples from borings B1, B3, and B4 were submitted for analysis for TPH-g, TPH-d, <br /> TPH-mo, BTEX, and chlorinated hydrocarbons. The laboratory results reported petroleum <br /> hydrocarbons TPH-g, TPH-d, and TPH-mo in sample B1-15' at concentrations as high as 57 ppm, <br /> 280 ppm, and 360 ppm, respectively. TPH-d and TPH-mo was detected in soil sample B4-21' at <br /> concentrations of 51 ppm and 91 ppm, respectively. BTEX and chlorinated hydrocarbons were not <br /> Advanced GcoEnvironmental,Inc. <br />