SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Treatment and Disposal of Affected Material Material Amount(Units) Action(Treatment or Disposal w/Destination) Date Tank(s) 9 West Coast Equipment; PO Box 2368, Turlock, 95381 09/08/1998 Piping unknown undocumented Unknown Free Product Estimated 20 gallons Removed by skimmer, unknown disposal destination. Jul 1992 to Jan product and water 1994 Soil Not well documented, Utilized as backfill in excavation for T1-T7 on top of 3 feet clean Circa 9/18/98 on the order of 300 cy backfill. Groundwater 1650 Gallons oily Ramos Environmental Services 09/04/1998 water and pea gravel 1515 South River Road, West Sacramento, CA 95691 III. Release and Site Characterization Information continued Maximum Documented Contaminant Concentrations (ppm)--Before and After Cleanup Contaminant Soil Soil After Water Water Contaminant Soil Before Soil After Water Water Before Before After Before After TPH(Gas) 1,300 NA 22 0.840 Toluene 1.9 NA 0.9 <0.0005 TPH(Diesel) 16,000 NA 60 0.410 Ethylbenzene 28 NA .41 <0.0005 TPH(Motor Oil) 87 NA 49 <0.200 Xylenes 91 NA .35 <0.0015 TPH(Kerosene) 0.26 NA 56 0.420 MTBE 0.6 NA 11 <0.001 Benzene 0.7 NA 3.5 <0.0005 TBA Not detected NA 1.4 <0.012 Lead 8.2 NA NA NA Comments: Soil Before—TPHg SS-3@2' (9/17/98), ethylbenzene and xylenes from T9-SS-1@9' (8/17/1998); benzene from MW1@20' (8/9/1988); toluene from MW-7@10' (10/19/1999), MTBE from stockpile sample D-4(9/8/1998); TPHd from GP-1@15' (4/8/1999); TPHk from OS-10-10 (12/10/2004); TPHmo from VEW-@10' (1/8/2001). Lead from stockpile sample SP-2A(9/17/1998). Soil After data not collected, therefore Not Applicable. Water Before—TPHg, benzene, toluene and xylenes from MW-1 on 7/6/94; TPI-Id from GP-1 on 4/8/99; TPHmo from CPT- 1-78 on 11/9/05; TPHk from VEW-2 (7/17/2001); ethylbenzene from RW-2 (1/25/2001); MTBE from Pit3 (9/11/1998); and TBA from MW (11/1/2001). Water After—highest concentrations of each COC detected last monitoring event: TPHg and TPHk from VEW-3/MW-8 (1/26/2011); TPH-d from VEW-4/MW-7 (1/26/2011); TPHmo from all monitoring wells (1/26/2011); BTEX, MTBE and TBA from all wells or either 1/8/09 or 7/2/09. IV. Closure Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes Does corrective action protect public health for current land use? Yes Site management requirements: None Should corrective action be reviewed if land use changes?Yes Monitoring/Vapor wells decommissioned: Yes Number Decommissioned: 32 Number retained: 0 List enforcemert actions taken: NORs issued 05/19/1989, 01/14/1991 and 10/31/2007 List enforcement actions rescinded: None Paap 2