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• P0fminary Environmental Assessment Report Pittman Elementary School,Stockton,CA December 10,2003 Page 10 • for the constituents of interest are presented in Table 5, below. Air Toxics Ltd., a California-certified laboratory, performed the soil gas analyses. Severn Trent Laboratories, Inc., a California-certified laboratory, performed the groundwater analyses. Table 5—La oratory Anal tical Methods Northern Former UST Site Location Sam le Denth Matrix Number of Sam les Discrete Anal ses Constituent Method 10 feet bgs soil as 44 VOCs TO-15 4 borings 20 feet bgs soil gas 4 4 VOCs TO-15 40 feet bgs oundwater 4 4 VOCs 8260B 1 travel water 1 1 VOCs 82608 blank 6.6 POLYCHLORINATED BIPHENYLS SAMPLES Soil samples were collected from two locations at each of the four switching stations located at the site. Ten discrete surface soil samples were analyzed for PCBs by EPA Method 8082. In addition, the equipment blank was analyzed for PCBs by EPA Method 8082. Laboratory analytical methods for the constituents of interest are presented in Table 6, below. Severn Trent Laboratories, Inc., a California- certified laboratory, performed all analyses. Table 6—Laborator Anal tical Methods Pol chlorinated Bi henvIs Location Depths Matrix Number of Discrete Analyses Method Samples Samples • 2 locations downgradient on pad 0-0.5 and 2-2.5 feet bgs soil 8 surface 8 PCBs 8082 per switching station(4 stations) (hold 8 deep) 2 locations at PG&E substation 0-0.5 and 2-2.5 feet bgs soil 2 surface 2 PCBs 8082 (hold 2 deep) 1 second sample 0-0.5 and 2-2.5 feet bgs soil I surface I PCBs 8082 (hold 1 deep) I equipment blank water 1 1 PCBs8082 6.7 HYDRAULIC ELEVATOR SAMPLE The elevator hydraulic oil sample was analyzed for PCBs by EPA Method 8082. Severn Trent Laboratories, Inc., a California-certified laboratory,performed the analysis. 7.0 LABORATORY ANALYTICAL RESULTS 7.1 LAWN AREA RESULTS The laboratory analytical results indicate that selenium and thallium were not detected at or above the laboratory reported detection limits in any of the surface samples collected and analyzed for these constituents. Antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, silver, vanadium, and zinc were detected in at least one of the soil samples analyzed for these constituents. Hexavalent chromium was detected in all of the samples analyzed for this constituent, with the exception of one background sample with a raised detection limit. Laboratory analytical results of the discrete samples analyzed for metals are summarized in Table 7 on page 12. Laboratory report sheets indicating analytical methods used, detection limits, and the results of the • analyses are included in Appendix B. I , �J CONDOR