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� • i 1 LEVINE•FRICKE 1 A recent leak from the Concord main pipeline would have resulted in samples that contained detectable concentration of JP-4 and a 1 higher percentage of diesel fuel. Fuel fingerprint characteriza- tion analyses found no JP-4 in any of the samples. Diesel fuel percentages ranged from less than 5% to around 10% of the fuel samples. 1 A leak within the week prior to shutdown in either the Time oil or Mobil & Shell pipelines would have resulted in samples dom- inated by unleaded fuel by a factor of 1. 5 to 2. This factor increases to 1.7 to 3 if fuel shipments over the previous 3-1/2 weeks prior to shutdown are considered. 1 PIPELINE TESTING All three pipelines were tested by static monitoring, acousti- cally, and by using a tracer gas. Static monitoring indicated that all three pipelines were not leaking. The acoustic and 1 tracer gas testing is described below. Acoustic Testing 1 Acoustic testing of each of the three pipelines in the investiga- tion area was performed by Pelagos Corporation, San Diego, Cali- fornia under the supervision of SPPL on February 27, 1988. No leaks were detected in any of the SPPL pipelines tested. The Pelagos report may be found in Appendix B. Tracer Gas Testing 1 Tracer Research, Inc. Tuscon, Arizona, performed tracer gas test- ing of the pipelines. Each of the pipelines were tested by 1 injecting a separate chlorofluorocarbon into each pipeline and monitoring the concentration of the gas in the surrounding soils. No leaks were detected in any of the pipelines. The Tracer 1 Research report will be submitted to the Regional Water Quality Control Board under separate cover after it has been completed. 1 CONCLUSIONS The data collected and analyzed during the investigation 1 described in this report do not indicate that the fuel hydrocar- bons present in the subsurface in the vicinity of the SPPL pipe- lines originated from a SPPL pipeline leak. i i 1 -7-