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K L E I N F E L D E R EXPECT MORE'" • The wells will be allowed to set for at least 2 hours, but will be monitored by the end of the same day, for chlorine residual and pH using pH and chlorine test strips. The chlorine test strips will be able to identify both total chlorine and free chlorine. Wells with detected free chlorine will be considered to have had a sufficient amount of chlorine added to meet the chlorine demand of the well, such that effective disinfection can occur with free chlorine. If free chlorine is not detected additional chlorine solution (in increment amounts of approximately '/4 the original volume of 50 ppm chlorine of affected well) will be added to the well followed by surging as described above until a free residual chlorine is detected using the test strips. The test strips will be capable of detecting free chlorine in the range of 0 to 10 ppm. • The wells will be allowed to set from 12 to 24 hours prior to purging of the wells for the purpose of removing chlorine residual water in the wells. Kleinfelder will coordinate with the OLWD to dispose of this water. At this time Kleinfelder recommends utilizing the existing treatment system to dispose of the chlorine residual water. During purging of the wells the chlorine test strips will be used to verify that chlorine is no longer detected. The wells will then be allowed to set approximately 72 hours after which a groundwater sample will be collected from the affected wells. The groundwater samples will be analyzed for total coliform to evaluate the effectiveness of the disinfection procedure. Repeating of said procedures may be necessary. Based partly on the information obtained from this process Kleinfelder will discuss potential sources of total coliform. This discussion will include research and discussion related to nearby sources of coliform, former site operations, nearby leach fields etc. Please note, depending upon the success of the disinfection program, additional disinfection of wells with continued detections of coliform may be necessary. If total coliform is detected repeatedly after multiple disinfection events, other sources than well cross-contamination will need to be considered including localized groundwater contamination by total coliform, which may or may not be influenced by the OLWD treatment system. Wells MW-5, MW-6 and MW-7 have all had detections of total coliform and these wells are upgradeint and approximately 7500 feet from the sites WWTP. 48093.E01/ST07R052/CJC/Iv Page 10 of 15 ©2007 Kleinfelder, Inc January 26,2007