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OLE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California I ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u 1L u A u A u A u u IL u 1L u 1L u IL u !L !L level feel sea level Comments MW-8 11/12/98 as ns ns as as as ns as ns as as ns ns as 2038 wellhead survey screened 12/30/98 68 1 2 076 <0 50 081 <50 no no no no no no na no 4536 24 98 no odor!no sheen interval 03126!99 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 <0 50 <D 50 <50 <50 <10 no no 4108 2070 no odor!no sheen 41 66 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 29 <0 50 <0 50 <0 50 <50 <50 <5 0 86 <0 50 4052 2014 no odor!no sheen 08/31/99 <50 <0 50 <0 50 <0 50 <0 50 1 6 <0 50 <0 50 <0 50 <50 <50 <5 0 54 <0 50 4544 2506 no comment 12!09!99 <50 <0 50 <0 50 <D 50 <0 50 14 <0 5D <0 50 <0 50 <50 <50 <5 0 60 <0 50 4701 2663 02121!00 210 <0 50 <0 50 <0 50 <0 50 20 <0 50 <0 50 <0 50 <50 <50 <50 69 <0 50 4538 2500 no odor 1 no sheen 05118100 53 <0 50 <0 50 <0 50 <0 50 1 8 <0 50 <0 50 <0 50 <50 <50 <50 na no 4054 2016 no odor I no sheen I 09126/00 68 <0 50 <0 50 <0 50 <0 50 <50 na no no no no no no no 4913 2875 no odor 1 no sheen 12120100 <50 <0 50 051 <0 50 <0 50 <50 na no no no no no no no 4752 2714 no odor 1 no sheen 03/27101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no na 4613 2575 no odor 1 no sheen 06/26101 <50 <050 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <5 0 <50 <5 0 57 <D 50 4876 2838 no odor 1 no sheen 09105!01 1800 200 25 65 250 <5 0 no no no no no no no no 5384 3346 no odor 1 no sheen 11/30/01 370 65 <0 50 60 083 10 no no no no no na no no 5386 3348 no odor 1 no sheen 02/27102 90 <0 50 <0 50 <0 50 <0 50 66 no no no no no no no no 5049 3011 no odorno sheen 05/16102 76 <0 50 1 3 <0 50 -050 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 as ns as as ns as as as as as as ns as as 5854 3660 dry 12IONO2 360 1 2 1 3 26 <0 50 77 as as ns as as as as as 5709 3515 no odor 1 no sheen 02117!03 120 <0 50 31 <0 50 <0 50 6 1 no no no no no no no no 5389 3195 no odor!no sheen 06/03103 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 09118103 as as as as ns as as as as as as ns as as dry nm dry 11124103 as ns as as as as as as ns as as as as as 5835 3641 not sampled 02123/04 100 -4060 <0 50 <0 50 <0 50 40 <0 50 <0 50 <0 50 51 <50 <50 54 <0 50 5481 3287 no odor 1 no sheen 06!07104 70 <0 50 058 <0 50 <0 50 <50 no no no an no no no no 5502 3308 no odor 1 no sheen 09/07104 as ns as as as as as as ns as as as as as dry nm dry 12110!04 ns ns as as ns as as ns ns as as ns as as 5926 3732 considered dry 03109105 67 <0 50 34 <0 50 <0 50 1 7 <0 50 <0 50 <0 50 <5 0 <50 <5 0 37 <D 50 5572 3378 odor!no sheen 05124!05 76 <0 50 <0 50 <0 50 <0 50 <50 no na no no no na no no 5076 2882 odor 1 no sheen 08131!05 88 <0 50 -.050 <0 50 <0 50 <50 no no no na no no no no 5572 3378 no odor 1 no sheen 419gmn1S A& Proged No 1419 48 Page 8 of 13 HORIZON EIMRONMENTAL INC