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n j T <br /> t <br /> Ozone Microsgarga System Annual Skates <br /> Se tember 2 2003 eport—Fortner 7b Stattarz No G9$1,Stockton,Calcfornia r <br /> Benzene Concentrations <br /> r <br /> " Figures 3 and illustrate the be <br /> of December 2000 tfu-ou nzene concentrations frori l'uarterly and monthly <br /> 7/22/03 Ju1Y 2003 DuringY sampling events <br /> }, benzene has increased from 0 53'on December <br /> 30, 200ent 2 ong mod (12/30/02 through <br /> July 22, 2003 m MW-16 <br /> fluctuated be 0 S3 Tl�e benzene eoncentratton rri M 27 parts per billion (ppb) on <br /> ' !n and 38 ppb Duringthe s W-16 during ,this rePorttn <br /> 7 decreased from 170 same reporting period, g period <br /> decreased ppb°n December 30, 2002 to 35 ' the ber►zene concentration <br /> unng the time penod ppb on July 22, 2043 Q <br /> This is a 79/o <br /> The benzene concentration re " <br /> F was 160 ppb The lasts Ported to 11�W-16 on December 12, 2001 <br /> Itt[W-16 as 27 sampling results, an Jul ? prior to the system startup, <br /> Ppb This n a decrease it , on Y 22, 2003, reported the benzene <br /> 710 ppb on December I2, 2001 to 35 The benzene concentration reductio�ncentratron to <br /> . <br /> time period Hrstor,callene ppb on July 22, 2003 showed a,95% decrea VW-7 from <br /> (8/21/99) to the most recent samPlang ev nta�l2 s from the zmt�al se over the sarne <br /> MW_16and decreased by 99% m well �oundwater sampling events ' <br /> { 2/03) have re1nained the same (27 <br /> have decreased from 290 -7 Addrtronally, the maximum benzene concentrations <br /> VW-7 PPb to 27 ppb rn well MW-16, and from 2,900 <br /> ppb to 35 ppb to well <br /> MtBE Concentrations <br /> t = <br /> Figures 3 and 4 illustrate the MtBE concentrations ' <br /> December 2001 throe from Quarterly and mon"thl ' <br /> 7122/03 July 2003 ons <br /> the current r Y sampling events of <br /> ), IVItBE has increased from non detect (2-ppb) <br /> Pehod (12/30/02 through <br /> (PPb)on July 22, 2003 m MW-16 ( ppb) December 30, 2002 to 31 arts <br /> fluctuated between non detect The Mt p concentration in MW-16 d r Per billion <br /> concentration m and 89 Ppb Dunng the same r during(has reporting Period <br /> WW-7 remained below During <br /> limits eparting period, the MtBE , <br /> The MtBE concentration r orted xn ' <br /> was 250 MW-16 on December 12, 2001 <br /> ppb -The last sampling results, on Jul 22 , pnar to the system start up, <br /> Y , 2003, reported the MtBE concentration r, <br /> laolza os � , <br /> 4 <br /> f <br />