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� II OLE 1 0 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 i32350 Waterloo Road,Stockton,California s ethyl Depth to TOC GW Well TPHg ibenzene toluene benzene xylenes MTBEI DIPE�IETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u u !L u IL u h (Ug/0 (U !L u ff u !L u !L u IL !L u !L u !L IL feet feel sea level feet sea level Comments MW-8 11!12198 as as as as as as ns as as as as ns as as 2038 wellhead survey screened 12/30198 68 1 2 070 <0 50 081 <5 0 na na no no no na no no 4536 24 g8 no odor 1 no sheen interval 03126!99 58 <0 50 <0 50 1050 <0 50 { 5 1 <0 50 <0 50 <0 50 <50 <50 <10 no no 4108 2070 n0 odor!no sheen 41 66 06102199 <50 -050 <0 5D <0 50 -050 29 <0 50 <0$0 -050 <50 <50 < 08/31/99 <50 <0 50 <0 50 <0 50 -050 16 -050 <0 50 <0 50 <50 <50 <50 5 54$0 c0 50 4<0 50 45 52 20 14 no odor 1 n0 sheen 4 5 44 2506 no tomment 12109199 <50 <0 50 <0 50 <0 50 <0 50 I 14 <0 50 <0 50 <0 50 <50 <50 <50 60 <0 50 47 01 2663 02121/00 210 <0 50 <0 50 <0 50 <0 50 20 <0 50 <0 50 <0 50 <50 <50 <5 0 69 <0 50 4538 2500 no odor 1 n0 Sheen 05118/00 53 <0 50 <0 50 <0 50 <0 50 18 <0 50 <0 50 <0 50 <5 0, <50 <50 no no 4054 2016 no odor!no sheen 09126/00 68 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 4913 2875 no odor 1 no sheen 12/20/00 <50 <0 50 051 <0 50 <0 50 <50 no no no no no no no no 4752 2714 no odorno sheen 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 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 1 no sheen 09105/01 1800 200 25 65 250 <50 no no no n0 no no no no 5384 3346 no odor 1 no sheen 11130101 370 65 <0 50 60 083 ' 10 no no no no na no no no 5386 3348 no odor!no sheen 02127/02 90 <0 50 <D 50 <0 50 <0 50 t 66 no na no no no na no no 5049 3011 no odor 1 no sheen 05116/02 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)no sheen 09113102 as ns as ns ns a as ns ns as ns ns ns as 5854 3660 dry 12lO4102 360 12 1 3 26 <0 50 77 as as as as as as ns as 5709 3515 no odor!no sheen 02117103 120 <0 50 31 <0 50 <0 50 61 no no no no no no no no 5389 31 95 n0 odor!no sheen 06103103 100 <0 50 <0 50 -050 <0 50 57 <0 50 <0 50 <0 50 <50 <50 -50 73 <0 50 5322 3128 no odor 1 no Sheen 09/18103 as as as as as ns as ns as as as ns as as dry am dry 11124103 ns as as as as I ns as as as as as as ns as 5835 3641 not sampled { 02123!04 100 <0 50 <0 50 <0 50 <0 50 40 <0 50 <0 50 <0 50 51 <50 <5 0 54 <0 50 5481 3287 no odor I no sheen 06!07!04 70 <0 50 058 <0 50 <0 50 <5 0 no no no no no no no no 5502 3308 no odor!no sheen 09/07/04 as as as as as as as as as as as as as as dry nm dry 12/10104 ns ns as as ns ns ns as as as ns as as as 5926 3732 considered dry 03109/05 67 <0 50 34 <0 50 <0 50 1 7 <0 50 <0 50 <0 50 <50 <50 <5 0 37 <0 50 5572 3378 odor!no sheen 05/24/05 76 <0 50 <0,50 <0 50 <0 50 <5 0 no no no no no no no no 5076 2882 odor 1 no sheen 08131/05 88 <0 50 <0 50 <0 50 <0 5o <5 0 no no no no no no no na 5572 -3378 no odor 1 no sheen t I I i I I � I I ' ! I 419gmr06 xft Pmpd No 141940 I Page 8 of 13 HORIZON EMRONXZNTAL INC