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Laboratory analytical results showed detections in the samples taken from the <br /> northern tank area and the results are as follows. Detctions of MTBE were <br /> encountered in four borings in the northern tank area. The highest detection of <br /> MTBE was in a shallow groundwater sample taken from GP-3 which'contained <br /> levels at 1,700 ppb MTBE. Additional detections of MTBE were made in the <br /> shallow groundwater samples taken from borings GP-2, GP-4 and GP-5 Benzene <br /> was encountered at low levels in two of the borings. The detections of benzene f <br /> were found in the shallow groundwater samples taken from borings GP-4 and GP- I <br /> 5. TPH Gasoline, TPH diesel, and all other oxygenate and volatile constituants <br /> were non detect. h <br /> i <br /> Laboratory analytical results showed detections in the samples taken from the i <br /> southern tank area and the results are as follows: Detections of diesel were <br /> I <br /> encountered in two geoprobe borings which were located in the center of the <br /> former tank pit. The detections were in the shallow groundwater in boring GP-9 <br /> and GP-12: The levels were 5,200 ppb and 11,000 ppb, respectively. :Detections <br /> of MTBE consist of two detections in the same borings, GP-9 and GP-12. The <br /> highest detection was in boring GP-12 which had levels of 250 ppb. Lastly, <br /> volatile gasoline constuants Toluene, Ethyl benzene, and Xylene were encountered <br /> at low levels in boring GP-12. All other water samples were nori detect for <br /> oxygenates, and volatile constants. No detections of groundwater impact were <br /> made from water samples collected outside the former tank pit in the southern <br /> area. <br /> TABLE II <br /> SUMMARY OF GROUNDWATER ANALYTICAL RESULTS <br /> TOTAL PETROLEUM HYDROCARBONS AS GASOLINE AND DIESEL <br /> OXYGENATES AND VOCs <br /> Boring Number Sample EPA Method EPA Method EPA Method 8260 MTBE, EPA Method 8020 BTEX(ug/l.) <br /> Depth 8015 Gasoline 8015 Diesel ETBE,TAME,DIPE,TBA, and 82611 VOCs(ug/L) <br /> (Feet) (ug/0 (ug/L) Ethaol,Methinol <br /> (ug/L) <br /> GP-1 Shallow ND ND NDND <br /> GP-1 Deep ND ND ND ND <br /> GP-2 ShallowND ND 160 MTBE ND <br /> GP-3 Shallow ND ND 1,700 MTBE ND <br /> GP-4 Shallow ND ND 260 MTBE 16.0 Benzene <br /> I <br /> Avalon Environmental Consultants Kashmir 6 Dalwidner Dhoot <br /> 20 Corporate Plaza 9627-0014 <br /> Newport Beach,California .. 8 15600 S.Harlan Road <br /> E I <br />