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<br /> Groundwater Monitoring Data
<br /> Beacon Station No. 641
<br /> 1210 E. Hammer Lane, Stockton, California
<br /> Well Date TPHg B T E X MTBE DIPS ETBE TAME TBA Meth Eth EDC EDB Depth to TOC GW
<br /> Number ug/L ugtL 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 Elevatto Elevatto Comments
<br /> MW-5 10/02/97 87,000 21,000 10,000 2,000 10,000 3,800 <5 0 <5 0 <5 0 <500 <50000 <10000 na na 5733 9958 4225 no sheen,no odor
<br /> sereen 03/31/98 10,000 2,100 1,500 270 710 530 na na na na na na na na 4919 5039 no sheen odor
<br /> mterval 06/10/98 3,100 510 470 45 310 180 na na na na na na na na 4622 5336 no sheen odor
<br /> *451 09/08/98 24,000 6,500 1,000 920 1,400 4,500 <25 <2 5 34 48 3,600 <25 na na 4955 5003 no sheen odor
<br /> 12/30/98 340 32 <2 5 29 <2 5 980 na na na na na na na na 44 10 5548 no sheen odor
<br /> 03/25/99 540 100 18 12 36 280 <10 <10 <10 <100 <50 <50 na na 4147 58 11 odor/no sheen
<br /> 06/02/99 2,700 1,200 83 230 120 1,200 <050 <0 50 <0 50 51 <50 <5 0 <050 <0 50 4251 5707 odor/no sheen
<br /> 08/31/99 30,000 4,700 3,700 1 700 2,600 9,100 <0 50 051 4 1 310 <500 <5 0 <0 50 <0 50 4810 5148 no comment
<br /> 12/09/99 3,100 32 52 40 87 6,200 <5 0 <5 0 <5 0 85 <500 <50 <5 0 <5 0 4496 5462 no comment
<br /> SW-1 10/02/97 ns ns ns ns ns ns ns ns ns ns ns ns na na 5657 nm nm ns
<br /> 's tiN t7 03/31/98 ns Its ns ns ns ns ns Its ns ns ns ns na na 5123 nm ns
<br /> interval 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 4584 nm ns
<br /> 611•.65' 09/08/98 ns ns ns Its ns ns Its ns ns ns ns ns na na 4926 nm ns
<br /> 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 4399 nm ns
<br /> 03/25/99 90 <0 50 0 71 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <50 na na 4195 nm slight odor/no sheen
<br /> 06/02/99 130 089 <050 <0 50 <0 50 130 <050 <0 50 <0 50 <5 0 <50 <50 <0 50 <050 4224 nm slight odor/no sheen
<br /> 08/31/99 1,000 150 53 45 31 1,400 <050 <050 065 54 <100 <50 <050 <050 4781 nm no comment
<br /> 12/09/99 53 <0 50 <0 50 <0 50 <0 50 500 <050 <050 <050 5 4 <50 <5 0 <0 50 <050 4460 nm no comment
<br /> VW-I 0325/99 20,000 4,000 2,000 900 1,700 3,000 <5 0 <5 0 <5 0 <50 <50 640 na na 4170 nm nm slight odor 1 no sheen
<br /> seretn 06/02/99 23,000 5,800 2,300 1,100 1,900 8,300 <5 0 <5 0 <50 240 <100 <I0 <5 0 <5 0 4221 nm slight odor/no sheen
<br /> interval 08/31/99 50,000 14,000 11,000 2,300 6,200 20,000 <50 <50 72 770 <2500 <50 <50 <50 4731 nm no comment
<br /> 4W-54' 12/09/99 26,000 3,300 1,900 880 2,600 8,800 <5 0 <50 <5 0 120 <500 <50 <50 <5 0 4520 nm no comment
<br /> VW-2 03/25/99 ns ns ns ns ns Its Its ns Its ns ns ns ns ns dry nm nm well dry Q 34 82'
<br /> een
<br /> scr06/02/99 its ns ns ns ns ns ns ns ns ns ns ns Its ns dry nm no comment
<br /> interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm no comment
<br /> 21'46' 12/09/99 ns ns ns Its ns ns ns ns ns ns ns ns ns ns dry nm no comment
<br /> VW4 0325/99 33,000 1,600 8,100 1,800 5,400 660 <5 0 <5 0 <5 0 140 <50 <5 0 na na 4207 nm nm slight odor 1 no sheen
<br /> Screw 06/02/99 13,000 6,000 180 1,400 300 4,000 <0 50 <050 26 85 <200 <50 <050 <0 50 4245 nm slight odor 1 no sheen
<br /> tatervai 08/31/99 11,000 860 230 470 140 6,900 <10 <10 <10 300 <1500 <100 <10 <10 4166 nm no comment
<br /> ,W.55' 12/09/99 11,000 1,200 550 560 430 6,200 <50 <5 0 <5 0 100 <500 <50 <5 0 <5 0 4560 nm no comment
<br /> VW-4 0325/99 ns ns ns ns Its ns ns ns ns ns ns ns ns ns dry nm nm well dryQ 39 18
<br /> sereen 06/02/99 ns ns ns ns ns ns ns its ns ns ns ns ns ns dry nm well dry Q 3916'
<br /> inttml 08/31/99 ns ns ns ns Its ns ns ns ns ns ns ns ns ns dry nm no comment
<br /> W401 12/09/99 1 ns ns ns ns ns I ns Its ns ns ns ns ns I ns ns dry nm no comment
<br /> 99gmthl 641 Page 2 of 3 HORIZON ENVIRONMENTAL INC
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