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California Department of Transportation August 17, 1999 Stockton Maintenance Station, Stockton, California Project No 103872-02 ' Benzene concentrations decreased in well MW-2 from 9 0 ug/l to non detect levels, toluene de- creased from 3 2 ug/l to non-detect, ethylbenzene decreased from 3 1 ug/l to non-detect, and total ' xylenes decreased from 12 ug/l to non-detect levels In «ell MW-3, total xylene concentiations increased fiom non detect in December 1998 to 2 9 ug/l during the recent monitoring event Data for MW-3 vvas not available fiom the Aptil 1999 ' monitoring event In well MW-4 theie has been an increase in total xylenes, fiom non detect levels to 11 8 ug/l In well MW-5, total xylene concentrations increased from non detect in December 1998 to 46 6 ' ug/1 during the recent monitoring event Data for MW-5 was not available from the April 1999 monitoring event TPH-G concentrations increased in well MW-6 from non detect levels in April 1999 to 680 u«/l MTotal Xylenes increased in well MW-6 from 2 7 ug/l to 36 0 ug/l Concentrations ofTPH-G increased in well MW-7 from non detect levels to 2,000 ug/1 Concen- trations of total xylenes increased from non detect levels to 125 ug/l ' Concentrations of TPH-G in well MW-8 decreased from 110 ug/1 to non detect and levels of TPH-D have also decreased from 400 ug/l to non-detect Concentrations of total xylenes in- creased from non detect levels to 19 0 ug/l ' In well MW-9 concentrations of TPH-G have increased from non detect levels to 200 ug/I Con- centrations of total xylenes increased from non detect levels to 49 7 ug/1 In well MW-10, total xylene concentrations increased from non detect in December 1998 to 6 3 ug/I during the recent monitoring event Data for MW-10 was not available from the April 1999 monitoring event ' In well MW-11, total xylene concentrations increased from non detect levels in April 1999 to 116 ug/1 ' stakWn doc 5