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Table 1 -Groundwater Monitoring Data Beacon Station No.474 3443 East Main Street,Stockton,California Well Date TPHg B T E X MTBE DIPE ETRE TAME TBA Meth. Eth. Depth to TOC GW Number ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L GW Elevation Elevation Comments MW-1 03/31/98 96 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 62.27 26.29 -39.98 06/10/98 as ns as as as ns as as as as as as 59.59 -33.30 no comment 09/08/98 ns as as ns as ns as as ns ns as as 59.68 -33.39 no comment 12/30/98 as ns as ns as as as ns nsns ns ns 57.70 31.41 no comment =MW-2 03/31198 5,000 1,100.0 86.0 71.0 270.0 <25.0 na na na na na na 61.45 25.42 -36.03 £':;' 06/10/98 as as as as as as ns as as as ns ns 58.76 -33.34 no comment 09/08/98 ns as as ns ns ns ns as Its ns as ns 58.82 -33.40 no comment 12/30/98 as as Its as ns as as as as as ns as 56.83 -31.41 no comment I:MW-J 03/31/98 72 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.53 25.54 -35.99 06/10/98 as as as ns as ns ns as ns ns as ns 58.85 -33.31 no comment 09/08/98 as as ns as ns ns ns ns as as as as 58.94 -33.40 no comment ' 12/30/98 as ns as ns as as ns ns as ns as ns 56.96 -31.42 no comment MW403/31/98 ns ns ns ns ns ns ns as ns ns as ns nm 25.15 nc not located 06/10/98 as as as ns as ns as as as as ns as nm nc not located 09/08/98 as ns as as as as ns as ns ns ns as nm nc not located 12/30/98 as ns as as as ns ns as as as ns as am nc Paved over MW-5 03/31/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.11 25.11 -36.00 06/10/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 58.41 -33.30 no odor/no sheen 09/08/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 58.41 -33.30 no odor/no sheen 12/30/98 <50 <0.50 2.5 0.89 5.8 <5.0 rra na na na na na 56.51 -31.40 no odor/no sheen MW4 03/31/98 78,000 23,000 8,500 1,100 6,300 <500 na na na na na na 61.43 25.44 -35.99 reported as MW-2A 06/10/98 120,000 23,000 17,000 1,600 15,000 <500 na na na na na na 58.69 -33.25 reponedasMW-2A 09/08/98 120,000 30,000 20,000 2,300 18,000 <0.50 <0.50 <0.50_' <0.50 <5.0 <50 <5.0 58.77 -33.33 odor/no sheen 12/30/98 71,000 20,000 6,500 1,900 11,000 <250 na na na na na na 56.85 -31.41 slight odor/no sheen MW4- 03/31/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.75 25.66 -36.09 06/10/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 59.04 -33.38 no odor/no sheen 09/08/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59.19 -33.53 no odor/no sheen 12/30/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 57.18 31.52 no odor l no sheen MW4103/31/98 100 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.51 25.68 35.$3 reported as MW-3A 06/10/98 80 0.9 <0.50 <0.50 <0.50 <5.0 na na na na na na 58.86 -33.18 reported as MW-3A 09/08/98 79 0.57 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 b.0 58.97 -33.29 slight odor/no sheen 12/30/98 51 2.4 0.69 <0.50 <0.50 <5.0 na na na na na na 57.13 -31,45 slight odor/no sheen MW79 03/31/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na as na as na na 62.59 26.58 -36.01 reported as MW-1A 06/10/98 66 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 59.91 -33.33 reported as MW-IA 09/08/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59.99 -33.41 no odorno sheen 12/30/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 58.01 -31.43 no odorno sheen 98QM Table 1 (474QMTBL1.x1s) Page 1 of 2 HORIZON ENVIRONMEN'T'AL INC.