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Semi-Annual Groundwater Monitoring and Quarterly Remediation Progress Report—Fir Project#52.75118.2390 st Quarter 2013 April 30, 2013 Page 5 4.2 B-ZONE During the First Quarter of 2013, all wells screened in the B-Zone were sampled; MW-5, MW-6, and MW-7. q groundwater concentration map for the B-Zone is provided as Figure 8. Dissolved GRO Distribution GRO has historically been detected in MW-5 throu h 180,000 Ng/L in MW-7 in 2001. DuFirst g MW-7 in B-Zone well MW-6 ata concentration Quarter 100 r 2013, GRO with the highest concentration reported at Pg/L, an increase from recenwas onlytdetectionsetected �Ve the laboratory PQL According to the sampling results provided by CRA for the former four of the off-site wells, S-7, sults provided and y cR at concentration Shell service station, GRO was present in Dissolved BTEX Distribution sof up to 7 100 pg/L (S-14). BTEX constituents have historical) reported at 470 ug/L in 2001 BTEX wasenotdetectedetected fabnve laboratory First Quarter 2013. with the highest concentration of benzene PQLs in any B-Zone wells during the in According to the sampling results provided by CRA for the former Shell service station, benzene was present off-site wells S-7 and S-14 at concentrations of 5.2 Dissolved MTBE Distribution ug/L and 30 pg/L, respectively. MTBE has historically been detected in MVV-5 through 233,000 Ng/L in MW-7 in 2001. MTBE was only detected above th with the highest concentration reported at Quarter 2013 at a concentration of 120 Pg/L. e PQL in B-Zone well MW-6 during the First According to the CRA provided sampling results collected for form in off-site well S-15 at a concentration of 740 Pg/L. former Shell service station, MTBE was present Dissolved TBA Distribution TBA has historically been detected in TBA h0 hi o callyMW- in 2002 MW-5 through MW-7 the First Quarter 2013. with the highest concentrations reported at BA was detected at a concentration of 31 Ng/L in B-Zone well MW-7 was not detected in off-site wells within the B-Zone, accordingW 7 during 4.3 C-ZONE to the CRA provided sampling results. During the First Quarter of 2013, forsthe C-was sampled and the only well screened in the C-Zone p Zone is provided as Figure 9. Dissolved GRO Distribution on-site. q groundwater concentration ma GRO has historically been detected in the C-Zone well MW-11 GRO has November 2007. GRO was detected at a concentration during the First Quarter 2013_ with the highest concentration reported at tration of 260 Ng/L in C-Zone well MW-11 Dissolved BTEX Distribution BTEX was not detected above PQLs in C-Zone well MW 11 during the First Quarter 2013.