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' TABLE 1 CUMULATIVE SUMMARY OF CONCENTRATIONS (mg/kg = ppm) OF <br /> • PETROLEUM HYDROCARBONS IN SOIL SAMPLES, FORMER EXXON <br /> RS 7-3942, 4444 PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> 1 <br /> Total <br />' Petroleum <br /> Sample Depth Ethyl- Hydro- <br /> Number Date (feet) - Benzene Toluene bgnmne Xylenes carb!Qns <br />' Composite samples of sods excavated during tank removal -HLA <br /> SP1(1-4) 09/09/86 NA NA NA NA <10 <br />' SP1(5-8) 09/09/86 NA NA NA NA <10 <br /> SP1(9-12) 09/09/86 NA NA NA NA <10 <br /> SP2(1-4) 09/09/86 NA NA NA NA 35 <br />' SP2(5-8) 09/09/86 NA NA NA NA <10 <br /> SP2(9-12) 09/09/86 NA NA NA NA <10 <br /> Closure samples from bottom of expanded excavation -HLA <br /> EX-1 09/23/86 20 0-21 0 <0 05 <0 05 NA <0 5 <10 <br /> EX-2 09/23/86 20 0-21 0 77 82 NA 260 6,900 <br /> EX-3 09/23/86 200-21 0 <0 05 040 NA 064 60 <br /> EX-4 09/23/86 20 0-21 0 0 10 14 NA 34 720 <br /> EX-5 09/23/86 20 0-21 0 <0 05 <0 05 NA <0 05 <10 <br /> EX-6 09/23/86 20 0-21 0 <0 05 <0 05 NA <0 05 <10 <br /> EX-7 09/23/86 20 0-21 0 <0 05 <0 05 NA <0 05 <10 <br /> Note- HLA = Harding Lawson Associates, AEMC = American Environmental Managernent <br /> Corporataon, EA =EA Engineering, Science, and Technology <br /> IComposite samples of soils stockpiled from expanded excavation before aeration - HLA <br /> SP1-4 0903/8 6 NA NA NA NA 5,600 <br /> SP5-8 09/23/86 NA NA NA NA 5,100 <br /> SP9-12 09/23/86 NA NA NA NA 1,600 <br /> IComposite samples of stockpiled soils from expanded excavation before aeration - HLA <br /> RSP(1-4) 10/03/86 <0 05 <0 05 NA <0 05 10 <br /> I RSP(5-8) 10/03/86 <0 05 <0 05 NA <0 05 <10 <br /> RSP(9-12) 10/03/86 NA NA NA NA 1,000 <br /> Composite samples following aeration (worst case) -HLA <br /> AS-1 11/13/86 NA NA NA NA 200 <br /> SP3-1 11/21/86 NA NA NA NA 25 <br /> I <br />