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1401� NW., Semi-Annual Groundwater Monitoring and Quarterly Remediation Progress Report—First Quarter 2013 April 30,2013 Project#52.75118.2390 Page 3 Groundwater monitoring and sampling activities at the nearby former Shell Service Station, located at 1267 Country Club Boulevard, were performed on January 21, 2013. Conestoga-Rovers & Associates (CRA) provided gauging and analytical results from wells S-1 through S-8 and S-10 through S-17 to be used as off- site coordinated data which is included as Appendix D. CURRENT ANALYTICAL DATA—A-ZONE (MW-1, MW-3, MW-4, MW-8, MW-9, MW-10, MW-12, AND MW-13 No. of detections above Constituents the laboratory PQL : No. Concentration (Ng/L) wells analyzed GRO 0 : 8 <50 Benzene 0 : 8 <0.50 MTBE 0 : 8 <0.50 TBA 1 : 8 26 1,2-DCA 0 : 8 <0.50 Gasoline range organics(GRO, equivalent to Total Purgeable Petroleum Hydrocarbons), Methyl tert-butyl ether(MTBE),Tertiary butyl alcohol(TBA), 1,2-dichloroethane(1,2-DCA),Practical quantitiation limits(PQL),Micrograms per liter(Ng/L). CURRENT ANALYTICAL DATA—B-ZONE (MW-5, MW-6, AND MW-7) No. of detections Constituents above the laboratory Concentration (Ng/L) PQL : No. wells analyzed GRO 1 : 3 100 Benzene 0 : 3 <0.50 MTBE 1 : 3 120 TBA 1 : 3 31 1,2-DCA 0 : 3 <0.50 CURRENT ANALYTICAL DATA— C-ZONE (MW-11) No. of detections above Constituents the laboratory PQL : Concentration (Ng/L) No. wells analyzed GRO 1 : 1 260 Benzene 0 : 1 <0.50 MTBE 1 : 1 3.8 TBA 1 : 1 9,800 1,2-DCA 0 : 1 <0.50 3.0 Remediation 3.1 OZONE INJECTION PERFORMANCE EVALUATION The OS system consisted of a wall mounted KVA C-SpargeTM System, model 5020, that produces up to four grams per hour (0.009 lbs per hour) of ozone. The OS system was programmed to inject ozone into ten wells