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TPH as gasoline was reported at a concentration of 13,000 mg/kg in sample NCS-4, collected <br /> from the east end of the UST excavation immediately after tank removal Other organic compounds <br /> reported above laboratory detection limits in sample NCS-4 were 110 mg/kg benzene, 440 mg/kg <br /> ' toluene, 900 mg/kg total xylenes, and 240 mg/kg ethylbenzene <br /> ' TPH as gasoline was reported at a concentration of 35 mg/kg in sample NCS-5, collected <br /> from under the product delivery piping Other organic compounds reported above laboratory <br /> ' detection limits in sample NCS-5 were 0 13 mg/kg toluene The three valence states for xylene were <br /> reported below detection Iimits No analysts were reported for total xylenes <br /> ' Each of the three soil samples was analyzed for 1,2-dibromoethane and concentrations were <br /> ' reported below detection limits in each sample <br /> Total lead was reported above laboratory detection limits in each of the soil samples Total <br /> lead concentrations ranged from 22 1 to 64 2 mg/kg Organic lead was reported below laboratory <br /> detection limits in each of the soil samples Reported lead concentrations are below California Code <br /> of Regulations hazardous material classification criteria total threshold limit concentration (TTLC) for <br /> inorganic lead is 1,000 mg/kg, and the TTLC for organic lead is 13 mg/kg) However, the total lead <br /> ' values of 64 2 mg/kg for sample NCS-5 is greater than 10 times the soluble threshold limit <br /> concentration (STLC) level and may potentially be hazardous <br /> Tank Testing Results <br /> Both tanks 817B-1 and 817B-3 passed the tightness test as certified in a report from Testing <br /> ' and Technology dated May 28, 1992 (Appendix D) using the method described in Section 3 0 The <br /> leak status is reported as passed for each of the tanks with the pass criteria being that no tracer was <br /> ' detected in the samples and less than one-quarter inch of water was detected in the tank bottom at the <br /> time of sampling According to EPA standard test procedures for evaluating leak detection methods, <br /> the Tracer Tight® method is capable of detecting leaks of 0 05 gallons per hour with a probability of <br /> detection (Po) of 0 97 and probability of false alarm (PFA) of 0 029 The results have been submitted <br /> ' to both the Navy and the San Joaquin County Public Health Services, Environmental Division <br /> TANKRMU NEW <br /> 044-0162MATRI 5/14193 15 <br /> 1 <br />