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C A M B R I A <br />hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), and fuel <br />oxygenates (MTBE, TAME, DIPE, ETBE, and TBA) by EPA Method 8260B. <br />Stockpile Sampling: During construction activities, pea gravel was placed into two temporary <br />stockpiles onsite. Cambria collected stockpile samples and they were analyzed for TPHg, <br />BTEX, and fuel oxygenates. The pea gravel was reused after replacement of product piping with <br />permission from SJCPHS/EHD. <br />ANALYTICAL RESULTS <br />Soil sample results are presented on Table 1 and TPHg, BTEX, and MTBE results are shown on <br />Figure 2. The certified analytical report is included in Appendix A. A summary of the data is <br />presented below. <br />Samples P-2 through P-5, P-7, and P-8 contained TPHg at concentrations ranging from 2.7 to 220 <br />parts per million (ppm). Benzene was detected in samples P-2, P-3, and P-8 at concentrations <br />ranging from 0.020 to 0.066 ppm. MTBE was detected (by EPA Method 8260B) in all soil <br />samples at concentrations ranging from 0.015 to 0.42 ppm. TAME was detected in soil sample <br />P-8 at 0.038 ppm and TBA was detected in samples P-3, P-6, and P-8 at concentrations ranging <br />from 0.0069 to 0.61 ppm. <br />CLOSING <br />Based upon visual observations and the analytical results of soil samples during removal <br />activities, petroleum hydrocarbons and fuel oxygenates were found in soils beneath the area of <br />the replaced piping. Based on the concentrations and locations, this soil impact appears to be <br />associated with an old release documented in Fugro West, Inc.'s April 19, 1995 Underground <br />Storage Tank Closure Report. The dispenser area was subsequently investigated and the results <br />are documented in Enviros, Inc.'s May 21, 1996 Soil Boring Installation Report. Based on this <br />information, Cambria does not recommend additional investigation of the soil near the dispenser <br />area at this time. <br />1359 2 <br />