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&E 11 . R GROUNDWATER MONITORING DATA Beacon Station No 72474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPJ; ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L (ug/L u IL) u IL u !L u !L (u/L (ug/L (ug/L u !L u !L (ug/L) (ug/L)((ug/L feet feet msl feet ms! Comments MW-4 03131/98 ns ns ns ns ns ns ns ns ns ns ns ns ns AS nm 2515 nm not located screened 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located Interval 09108/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located 65-86 12130/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns� nm nm paved over 03/25/99 ns ns ns ns ns no ns ns ns ns ns ns ns ns nm nm paved over 08/30/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 12!10199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 09/28/00 <50 'Co 50 <0 50 <0 50 <0 50 <5 0 no na na na no na no no 5616 3101 no odor/no sheen 12!21/00 <50 <0 50 <0 50 <0 50 <0 50 <50 no no na na no no no no 5528 3013 no odor f no sheen 03128!01 <50 t 1 56 093 45 <50 no no no no na na na na 5441 -2926 no odor/no sheen 06/27/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 5590 3075 no odor 1 no sheen 09/06101 <50 <0 50 076 <0 50 16 <50 no no no no na no no na 5797 -3282 no odor 1 no sheen 12/03/01 <50 <0 50 057 <0 50 <0 50 <5 0 na na na na na na na na 5857 -3342 no odor 1 no sheen 03101/02 <50 <0 50 <0 50 <0 50 <0 50 <50 no na no na na no no no 5729 3214 no odor 1 no sheen 05/20/02 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 5715 2713 3042 no odor 1 no sheen 08/29/02 <50 <0 50 <0 50 <0 50 051 <5 0 na na no no no no no no 6053 -3340 no odor 1 no sheen 12106/02 <50 <0 50 054 <0 50 <0 50 <0 50 no no na no no no na na 6075 3362 no odor I no sheen 03/05/03 1800 <0 50 068 <0 50 <0 50 <5 0 na no no na no na no no 5982 -3269 no odor 1 no sheen 06/03103 2300 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 45 <0 50 5893 -3180 no odor 1 no sheen 08/29103 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no na na no 61 00 -3387 no odor 1 no sheen 11/25/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 80 -3467 not sampled 03101/04 1200 100 200 20 110 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 057 <0 50 6050 2508 -3542 no odor 1 no sheen 06/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6103 -3595 not sampled 09109104 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no na 6268 -3760 no odor/no sheen 12/08104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6278 -3770 not sampled 03/10/05 <50 <0 50 12 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 6160 -3652 no odor 1 no sheen 05/25105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6043 -3535 not sampled 09/01105 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na no no na na 6122 -3614 no odor 1 no sheen I 7 PrettgeaNo 147448 Page 4 of 18 HORIZON ENVIRONAIIMAL INC