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TABLE I -RESULTS OF LABORATORY ANALYSIS.DIESEL TANKS _ STOCKTON UNIFIED SCHOOL DISTRICT TRANSPORTAT70N CENTER HLI 00817 Location' Sample Depth TPH-D Benzene Toluene Ethyl- Xylenes OVA (feet) (mg'K y (ug/Kg) (ug/K-) benzene {ug/Kg) PPM E (ung) Tank Samples: Excavation T-5 592 14 <1.0 <5 <5 <5 <5 1.9 593 13.5 <1.0 <5 <5 <5 <5 1.9 T-6 594 14 <1.0 <5 <5 <5 <5 4.1 599 I5 <1.0 <5 <5 <5 <5 5.0 T-7 595 15 <1.0 <5 <5 <5 <5 1.9 596 14 <1.0 <5 <5 <5 <5 1.9 597 15 <1.0 <5 <5 <5 <5 7.5 598 I7 250 <50 <50 280 2,270 75 604 18 6,150 <150 <150 536 2,740 NA Stockpiles: S-1 to S-4 584-7 -- <1 <5 <5 <5 8 NA S-5 to S-8 588-91 - <1 <5 <5 <5 <5 NA S-9 to S-12 600-603 -- 271 <50 <50 <50 70 NA S-13 638 - 6,190 <63 <65 85 114 NA Pipeline Samples: Trench: P-1 612 5'9" <1.0 <5 <5 << <5 2.1 P-2 613 4'9" <1.0 <5 <5 <5 <5 2.0 P-3 614 5'2" <1.0 <5 <5 <5 <5 1,9 ` P-4 615 4'9" <1.0 <5 <5 <5 <5 1.9 P-5 616 4'10" <1.0 <5 <5 <5 <5 2.0 P-6 617 5'0" <1.0 <5 <5 <5 <5 7,0 P-7 618 5'0" <1.0 <5 <5 <5 <5 2.0 P-8 619 5'0" <1.0 <5 <5 <5 <5 2.0 P-9 620 4'10" <1.0 <5 <5 <5 <5 2,0 P-10 621 5'0" <1.0 <5 <5 <5 <5 19 P-1 I 622 5'0" <1.0 <5 <5 <5 <5 2.0 P-12 623 5'0" <1.0 <5 <5 <5 <5 2.2 i P-13 624 510" <1.0 <5 <5 <5 <5 4.2 P-14 625 510" <1.0 <5 <5 <5 <5 2.2 P-15 626 5'6" <1.0 <5 <5 <5 <5 L9 P-16 628 5'0" <1.0 <5 <5 <5 <5 2.2 P-17 629 5'6" 1,550 <50 <50 <50 <50 1.8 Stockpiles i SP-1 630 -- <1.0 <5 <5 <5 <5 NA SP-2 631 -- <1.0 <5 <5 <5 <5 NA SP-3 632 - 2.2 <5 <5 <5 <5 NA a. Refer to Figures 1 and 2 for location of tank samples. Pipeline samples collected at 20-foot intervals from tanks to dispensing island. b. OVA measurements reflect container headspace vapor concentrations measured by Foxboro 123 OVA. Measurements reported as parts per million (ppm) as metbarze equivalent. Ambient levels varried between 1.4 and 1.6 ppm. TPH-D=Total Petroleum Hydrocarbons as diesel 1.<1=Laboratory Limit of Detection NA=Not Analyzed