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I <br /> Boring Number Sample EPA Method EPA Method EPA Method 8260 MTBE, EPA Method 8020 BTEX(uglkg <br /> Depth 8015 Gasoline 8015 Diesel ETBE,TAME,DiPE,TBA, and 8260 VOCs(ug/kg)ppb <br /> I <br /> (Feet]) (mg/kg)ppm (meg)ppm Ethanol,Methanol <br /> (mg/kg)ppb <br /> GP-9 15 ND ND 0093 MTBE I ND <br /> GP-9 20 NA NA NA NA <br /> I GP-10 5 NA NA NA NA <br /> GP-10 8 ND ND ND ND <br /> GP-10 15 NA NA NA NA <br /> GP-10 20 NA NA NA NA <br /> I <br /> Note NO — Not Detected at Method Detection Limits <br /> NA — Not Analyzed <br /> Detection Limits Varies depending on Laboratory used <br /> I 5.3 Laboratory Analytical Results (Groundwater) <br /> Groundwater samples were analyzed for extractable petroleum hydrocarbons by <br /> EPA modified 8015, volatile petroleum hydrocarbons and BTEX by 801518020, and <br /> oxygenates and lead scavengers by EPA method 8260 (See Scope of Work, <br /> I Appendix ll) <br /> Laboratory analytical results showed detections of MTBE In all samples analyzed <br /> Additionally, select groundwater samples also contained Toluene, TAME, Tert <br /> Butanol, Methanol, and Ethanol Levels of MTBE ranged from a high of 2600 ppb <br /> I In groundwater sample GP-8 to a low of 6 7 ppb In sample GP-4 The highest <br /> MTBE detections were from the offsite locations <br /> TABLE II <br /> SUMMARY OF GROUNDWATER ANALYTICAL RESULTS <br /> I TOTAL PETROLEUM HYDROCARBONS AS GASOLINE AND DIESEL <br /> OXYGENATES AND VOCs <br /> l Boring Number Scavengers 1,2 EPA Method EPA Method EPA Method 8260 MTBE, EPA Method 8260 BTEX <br /> DCA and 1,2 8015 Gasoline 8015 Diesel ETBE,TAME,RIPE,TBA, (ug/L) <br /> DBA (ug/L) (ug/L) (ug/L) Ethanol,Methanol Lead <br /> Scavengers 1,2 DCA and <br /> 1,2 DBA (ug/L) <br /> GP-1 ND ND ND 130 MTBE 1 8 Toluene <br /> l I I 1 0 TAME <br /> . Avalon Environmental Consultants 9627-001-6 <br /> foes Truck Plaza 15600 5 Harlan Road <br /> April 15,2001 8 Lathrop California <br />