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TABLE 1 Groundwater Monitoring Data Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to Toc ow Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date _12A) (ugill) (ugA) ( (ugfl) (ugA) (ugA) (ug/1) (ugA) (ugA) (9A) (u ) ( (feet) (feetms') (feet msl) Comments SW-1 10102197 ns no no ns no ns ns ns no ns no. ns na na 5657 nm nm ns screened 03/31/98 ns ns no ns ns no ns AS ns no no. no na na 5123 nm no Interval 0611058 no. no. no ns ns ns ns ns ns no ns ns na na 4584 nm ns 60'-65 09/0B/9B ns ns ns no ns ns no no ns no no. ns na na 4926 nm ns 12030098 no no no ns ns no ns no. no no ns ns na na 4399 nm ns 03125099 90 <0 50 071 <0 S0 053 71 <0 50 <0 50 055 <50 <50 <50 na na 41 95 nm slight odor I no sheen 06002/99 130 089 <0 50 <0 50 <0 50 130 <0 50 -050 <0 50 <5 0 <50 <50 <0 50 <0 50 4224 nm slight odor 1 no sheen 08131/99 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <50 <0 50 <0 50 4781 nm no comment 12/09M 53 03/01100 <200 <2 0 <20 <2 0 <2 0 560 <2 0 <2 0 420 QO <300 <20 na ria 4238 nm no comment 06AXM 60 22 <0 50 <0 50 <0 50 510 <0 50 <0 50 <0 50 28 <200 <5 0 <0 50 <0 50 4179 run dear 09114/00 940 95 so 53 36 3100 <2 0 <0 <2 0 76 <250 <20 <2 0 <20 4790 nm Gear 12/12/00 <200 <2 0 <2 0 <2 0 <20 1900 na na na no na na na na 4399 nm dear 03/19/01 <100 <10 <10 <10 <10 470 na na na na na na na na 4196 nm dear VW 1 0MU99 20000 4000 2000 900 1700 3000 <5 0 <50 <50 <50 <50 640 na na 41 70 run nm slight odor 1 no sheen screened 06/02199 23000 5800 23W 1100 1900 B300 -50 -50 <50 240 <100 <10 <5 0 <S O 4221 nm slight odor 1 no sheen interval 08131/99 50000 14000 11000 2300 6200 20000 <50 <5 0 72 770 <2500 <50 <5 0 <5 0 4731 nm no comment 44 54 12!09199 26000 3300 1900 880 2600 8800 <50 <50 <5 0 120 <5W <50 <5 0 <5 0 4520 nm no comment 03101/00 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 no na 4246 nm no commend 06/06/00 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 4176 nm dear 09/14100 85000 16000 12000 2200 6300 16000 <20 420 <20 380 <25W <200 <20 <20 4790 nm Gear 12/12100 21000 4000 2900 690 1800 6300 na na na na na na na na 4423 nm Gear 03119/01 9400 2600 600 430 290 6100 na na na na na na na na 4172 run dear VW 2 03125099 ns ns ns ns ns no no ns no ns ns ns ns no nm nm run dry screened 06/02199 ns ns ns ns ns ns ns ns ns ns ns ns no no nm run dry interval 0013159 no ns no ns ns no ns no. Its no no ns ns ns nm run dry 21 36' 12/09/99 ns no no no. ns ns ns ns AS ns ns ns ns ns rim run dry 03101100 ns no ns ns ns no no no. ns ns ns no ns no nm nm dry 06106100 no ns ns no ns no no no ns ns no ns ns no nm nm i dry 09114100 ns ns ns no ns ns ns ns ns ns ns ns ns ns nm nm dry 12112100 no ns no ns AS ns no ns no. no. ns ns ns no run nm dry 03/19101 no no. ns ns ns ns no ns no. no no ns ns ns run nm dry VW 3 03125199 33000 16W 8100 1800 5400 660 <5 0 <S 0 <5 0 140 <50 <50 na no 4207 nm nm slight odor r no sheen screened 0610259 13000 6000 180 1400 300 4000 <0 50 <0 50 26 a5 <200 <5 0 <0 50 <0 50 4245 nm slight odor!no sheen interval 08/31/99 11000 860 230 470 140 6900 <10 <10 <10 300 <1500 <100 00 <10 4766 nm no comment 45 55 12!0959 11000 1200 550 560 430 6200 <5 0 <5 0 <5 0 too <500 <50 <50 <50 4560 nm no comment 03101100 12000 500 440 680 980 5000 <20 <20 <20 <200 <2000 <200 na na 4294 nm no comment 06006!00 5900 1400 170 340 260 5600 <20 <2 0 39 260 <2000 <20 t20 <20 4200 nm clear 09014100 2600 760 52 85 120 2400 <20 <2 0 <20 110 <250 <20 <20 <20 4828 nm dear 12/12000 3700 220 180 140 280 5500 na na na na na na na na 4463 nm dear 03/19/01 2600 110 72 150 160 2700 na na na na na na na na 4181 nm dear 641gmrOO As 1641 43 Page 3 of 4 HORIZON ENVIRONMENTAL INC