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TABLE 1 -RESULTS OF LABORATORY ANALYSIS:DIESEL TANKS STOCKTON UNIFIED SCHOOL DISTRICT TRANSPORTATION CENTER HLI 00811 Location' Sample Depth TPH-D Benzene Toluene Ethyl- Xylenes OVA (feet) (mg/Kg) (ug/Kg) (ug/Kg) benzene (ug/Kg) ppmh (ug/Kg) ` 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 =i 599 15 <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 17 250 <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 !L'_. 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 <65 <65 85 114 NA r>i Pipeline Samples: Trench: P-1 612 5'9" <1.0 <5 <5 <5 <5 2.1 P-2 613 4'9" <1.0 <5 <5 <5 <5 2.0 P-3 614 552" <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-6 617 590" <1.0 <5 <5 <5 <5 2.0 P-7 618 520" <1.0 <5 <5 <5 <5 2.0 P-8 619 530" <1.0 <5 <5 <5 <5 2.0 -1 P-9 620 W10') <1.0 <5 <5 <5 <5 2.0 P-10 621 52015 <1.0 <5 <5 <5 <5 1.9 P-11 622 590" <1.0 <5 <5 <5 <5 2.0 P-12 623 5'0" <1.0 <5 <5 <5 <5 2.2 P-13 624 550" <1.0 <5 <5 <5 <5 4.2 3 P-14 625 590" <1.0 <5 <5 <5 <5 2.2 P-15 626 5'6" <1.0 <5 <5 <5 <5 1.9 P-16 628 550" <1.0 <5 <5 <5 <5 2.2 P-17 629 5'6" 1,550 <50 <50 <50 <50 1.8 -� Stockpiles r� 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 =_I a. Refer to Figures 1 and 2 for location of tank samples. Pipeline samples collected at 20-foot intervals from tanks to dispensing island. a b. OVA measurements reflect container headspace vapor concentrations measured by Foxboro 128 OVA. Measurements reported as parts per million (ppm) as methane equivalent. Ambient levels varried between 1.4 and 1.6 ppm. TPH-D=Total Petroleum Hydrocarbons as diesel "<"=Laboratory Limit of Detection NA-Not Analyzed