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n OLE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- 1 Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u 1L IL) (ug (uglL) (ug1L} uglL) uglL) (u IL) u IL) (u ll-) (uglL) ug/L) (u L) (ug/L (uglL) (feet) (feet sea level) (feet sea level) Comments MW-8 11/12M ns ns ns ns ns ns ns ns ns ns7, ns ns ns ns 2038 wellhead survey screened 12/30198 88 12 076 <0 50 081 <5 0 na na na na na na na na 4536 -2498 no odor 1 no sheen interval 03126/99 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 <0 50 <0 50 <5 0 <50 <10 na na 4108 -2070 no odor 1 no sheen 41 66 06/02199 <50 <0 50 <0 50 <0 50 <0 50 29 <0 50 <0 50 <0 50 <5 0 <50 <5 0 86 <0 50 4052 -2014 no odor I no sheen 08131/99 <50 <0 50 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <5 0 <50 <5 0 54 <0 50 4544 -2506 no comment 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 14 <0 50 <0 50 <0 50 <5 0 <50 <5 0 60 <0 50 4701 -2663 02/21/00 210 <0 50 <0 50 <0 50 <0 50 20 <0 50 <0 50 <0 50 <5 0 <50 <5 0 69 <0 50 4538 -2500 no odor 1 no sheen 05118!00 53 <0 50 <0 50 <0 50 <0 50 18 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4051 -2016 no odor 1 no sheen 09/26100 68 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4913 -2875 no odor I no sheen 12!20100 <50 <0 50 051 <0 50 <0 50 <5 0 na na na na na na na na 4752 -2714 no odor I no sheen 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4613 -2575 no odor 1 no sheen 06126/01 <50 <0 50 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <5 0 <50 <5 0 57 <0 50 4876 -2838 no odor I no sheen 09/05/01 1800 200 25 65 250 <5 0 na na na na na na na na 5384 -3346 no odor I no sheen 11130101 370 65 <0 50 60 083 10 na na na na na na na na 5386 -3348 no odor 1 no sheen 02127/02 90 <0 50 <0 50 <0 50 <0 50 66 na na na na na na na na 5049 -3011 no odor 1 no sheen 05/16/02 76 <0 50 13 <0 50 <0 50 46 <0 50 <0 50 <0 50 <5 0 <50 <5 0 58 <0 50 5061 2194 -2867 no odor 1 no sheen 09113/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5854 -3660 dry 12104/02 360 12 13 26 <0 50 77 ns ns ns ns ns ns ns ns 5709 -3515 no odor 1 no sheen 02117/03 120 <0 50 31 <0 50 <0 50 61 na na na na na na na na 5369 -3195 no odor 1 no sheen 06/03/03 100 <0 50 <0 50 <0 50 <0 50 57 <0 50 <0 50 <0 50 <5 0 <50 <5 0 73 <0 50 5322 -3128 no odor 1 no sheen 09/18103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5835 -3641 not sampled 02/23104 100 <0 50 <0 50 <0 50 <0 50 40 <0 50 <0 50 <0 50 51 <50 <60 54 <0 50 5481 -3287 no odor 1 no sheen 06/07104 70 <0 50 058 <0 50 <0 50 <5 0 na na na na na na na na 5502 -3308 no odor I no sheen 09/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/10/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5926 -3732 considered dry 03109/05 67 -.050 34 <0 50 <0 50 1 7 <0 50 <0 50 <0 50 <5 0 <50 <5 0 37 <0 50 5572 3378 odor I no sheen 05/24105 76 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5076 -2882 odor I no sheen 08/31/05 88 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5572 3378 no odor!no sheen 12/12/05 70 <0 50 <0 50 <0 50 <0 50 26 na na na na na na na na 5320 -3126 no odor 1 no sheen I 1 419gmr05 Project No 141948 Page 8 of 16 HORIZON ENVIRONMENTAL.INC