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po <br />' TABLE 2 <br /> F' ANALYTICAL DATA- GROUND WATER <br /> Port of Stockton Farmer UST Site Na 3, San Joaquin County <br />' Results reported Inµg/l(Parts per billion=ppb) <br /> Well Date TPH9 Benzene Toluene Ethylbenzene Xylenes MTBE <br /> Number Sampled EPA 8015-m EPA 8260 EPA 8260 EPA 8260 EPA 8260 EPA 8260 <br />' MW3-1 07/09/99 610 18 302 236 791 N D <br /> 10/22/99 2,750 270 120 49 390 N D <br /> 02/08/00 1,800 12 85 30 180 N A- <br /> 05/17/00 <br /> .05/17100 180 120 82 38 428 N A. <br /> MW3-2 07/09/99 640 119 296 219 666 N D <br /> 10/22/99 4,100 49 270 50 320 N D <br />' 02/08/00 3,200 15 3 380 122 200 N A <br /> 05/17/00 790 64 174 19 181 N A <br /> MW3-3 07/09/99 8,420 113 2,506 886 1,772 ND <br />' 10/22/99 7,220 207 680 221 1,360 N D <br /> 02/08/00 4,500 150 460 180 880 N A <br /> 05/17/00 1,600 1 93 560 180 737 1 N A <br /> Reporting Linuts 1 50 µg/1 1 0 5 µg11 <br /> ND Analyte not deteded at reportmg Imuts listed m laboratory report <br /> NEL Not Analyrrti <br /> MCLS m NSn as follows banzvne=1,toluete=150,elhylbatzate'700,xyltnes=1750 <br /> SUMMARY OF FINDINGS <br />' On May 17, 2000, field personnel sounded and sampled the Port's former UST Site No 3 morntonng <br /> wells MW3-1 through MW3-3 At that time, the local direction of groundwater flow was calculated at <br /> approximately E22°S along a gradient of 0 012 feet/foot (equivalent to 12 feet of dip per 1000 feet of <br />' horizontal distance) The average depth-to-water on May 17 was 9 68 feet below the casing-tops of <br /> the three project monitoring wells <br />' Groundwater samples were collected from the monitoring wells on May 17, 2000 and analyzed for <br /> Total Petroleum Hydrocarbons as gasoline (TPHg)by EPA Modified Method 8015, volatile aromatics <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method 8260 No gasoline as free <br />' product was or has ever been observed in any well <br /> Overall, concentrations of all analytes have decreased significantly in all of the wells The change in <br />' groundwater gradient and direction are indicative of the influence of the Deep Water Channel, which is <br /> 1200 feet northeast of the site For MW3-1, benzene concentrations in groundwater remained the <br /> salve as last quarter at 1 2 µg/1 (May 17, 2000) Toluene concentrations in groundwater decreased <br /> from 85 µg11 on February 8, 2000 to 8 2 µg/1 (May 17, 2000) Ethylbenzene concentrations in <br /> groundwater decreased from 30 µg11 (February 8, 2000) to 3 8 µg/1 (May 17, 2000) Xylenes <br /> also exhibited a decrease from 180 µg/1 (February 8, 2000) to 42 8 µg/1 (May 17, 2000) and <br /> 1 <br /> ust srte3 gtr4 dor 5 <br />