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_ ' � ' Remedial Action Plan Frontier Transportation June 17, 2004 ` _ - Page 2 May 2002 Pit Soil Sample Analysis Results-EPA Methods 8015-gas and 82608 Sample ID Depth TPH-d TPH_a B T E X MTBE Top NES 4' <1 < 1 <5 <5 <5 <5 7.5 Top ESS 4' <1 <1 <5 <5 <5 <5 13 Top WSS 4' 36 <1 <5 <5 10 15 92 Top SES 4' <1 11 <5 <5 <5 <5 10 Top SWS 4' <1 <1 <5 <5 <5 8.5 21 Top NWS 4' <1 3 . 7 <5 <5 13 140 130 f Top NWS Dup 4' <1 4 <5 <5 15 140 190 I_ Top WNS 4' <1 <1 <5 <5 <5 <5 55 Top ENS 4' < 1 Bot NWS 12' 440 92 <5 11100 11 ,000 479000 43600 Bot NES 12' 700 350 490 1 ,300 14,000 21400 43700 Bot SES 12' 600 640 700 630 32,000 14,000 31700 Bot SWS 12' 320 89 15 22 21300 170 340 l Bot WSS 12' 32 3.2 24 <5 46 8 . 1 640 But WNS 14' 31000 2,500 27 ,000 330, 000 120 ,000 730,000 263000 _ Bot ENS 14' 340 120 13100 12200 18,000 24,000 193000 Bot ESS 14' 2,600 1 ,500 5,900 1 , 100 71900 31400 3,600 Units mg/kg mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg In August of 1996, Twinning Laboratories, Inc. (Twinning) advanced six vertical soil borings (B- 1 , B-2, BA,- 1RMW-IRB, and MW-2RA) and one angle boring (B-4) to depths betweenLOIV and 1A' bgs to assess subsurface conditions near the northeastern excavation. In addition, two hand augers (S- 1 and S-2) were advanced to 3 ' bgs to assess subsurface conditions beneath the dispenser and product lines and three groundwater monitoring wells, MW- 1 through MW-3 , were drilled to approximately 25' bgs to assess the subsurface water beneath the site. Initial subsurface water was encountered at 10. 5' bgs . Boring B-4 located northwest of the former USTs identified maximum TPH-g, BTEX (Benzene, Toluene, Ethylbenzene, and Xylene), and MTBE (Methyl-tert Butyl Ether) as 1 ,300 mg/kg, 180.7 mg/kg, and 110 mg/kg, respectively at 10 .2' bgs. Groundwater samples were collected from monitoring wells MW- I , MW-2, and MW-3 on August 30, 1996 and April 21 , 1997 by Twinning. Results are presented in -� Table 1 . In January of 1998, BEH advanced four (4) groundwater monitoring wells (MW-4 through MW-7) to assess the extent of subsurface contamination beneath the site (See Figure 2, Site Layout Map). Soil samples were collected every five feet. Laboratory analysis of soil samples identified no detectable concentrations of TPH-g, BTEX, or MTBE. Groundwater samples were subsequently collected and results are tabulated in Table 1 . J � J'