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4.0 LABORATORY ANALYSES Soil samples collected at the site were sent to Clayton Environmental Consultants (Clayton), a State of California-certified laboratory, in Pleasanton, California. Samples were shipped to Clayton on ice and under proper chain of custody. Three soil samples were submitted for chemical analysis of total petroleum hydrocarbons - gasoline range (TPH-G 801518020); total petroleum hydrocarbons - diesel range (TPH-D 8015); benzene, toluene, ethylbenzene, and xylene (BTEX 801518020); chlorinated hydrocarbons (CL-HC 8010); cadmium, chromium, lead, nickel and zinc (ICAP METALS 6010A); and polychlorinated biphenyls (PCB 8080). Laboratory analytical results and chain of custody records are included as Appendix D. Table 4-1 is a summary of the soil sample analytical data for organic compounds obtained from the 1'boratory analysis of the samples collected from the excavated area. Table 4-2 is a summary of the analytical data for inorganic compounds obtained from the laboratory analysis of the samples collected from the excavated area. TABLE 4-1 LABORATORY ANALYTICAL RESULTS, ORGANIC COMPOUNDS Sample TPH-G TPH-D Benzene Toluene Ethyl- Xylene C1, PCB Identification benzene HC Tank Pit Bot W 12 <2000 ND ND 0.12 0.62 ND ND Sample #1 (MDL: 2000) 9' depth Tank Pit NE Corner 16 <3000 ND ND 0.22 1.08 ND ND Sample#2 (MDL: 3000) 9' depth Stockpile - 1,2 ND <200 ND ND ND ND ND ND rn i (MDL: 200) All results reported in parts per million. ND = none detected MDL = method detection limit TABLE 4-2 LABORATORY ANALYTICAL RESULTS, INORGANIC COMPOUNDS Sample Identification cadmium chromium lead nickel zinc Tank Pit Bot W. - 1 @ 9' depth <0.4(MDL: 0.4) 30 4 33 56 Tank Pit NE Comer-2 @ 9' depth <0.4(MDL: 0.4) 27 4 28 80 Stockpile - 1.2 CQ=Q5ae <0.4 DL 4 4 32 *All results reported in parts per million. ND = none detected MDL = method detection limit WAL.-MART 92025 98I82304.236 4-1 TRACY,CALMORNIA