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presented in Appendix B Sonic cement-bond log data from each well w a s <br /> also collected Welenco's interpretation of the cement-bond logs is <br /> included in Appendix C <br /> 4 . 0 EVALUATION OF LOGS <br /> Based on the findings of the initial well inspection, the video logging and <br /> cement-bond logging, the following is an interpretation of the <br /> construction of each of the wells evaluated <br /> 4. 1 17950 South Airport Way <br /> The domestic well at the above address is constructed with 6-inch inside <br /> diameter (ID ) steel casing The total depth of the well is 590-feet below <br /> ground surface (bgs) based on the initial well inspection performed <br /> However, an obstruction was encountered in this well during the video <br /> logging at 41-feet bgs The camera could not be advanced past this depth <br /> and no further data could be collected for this well beyond 41-feet bgs It <br /> is noted in Welenco's log that the obstruction may possibly be two pipes <br /> of the same length on either side of the casing Casing seams/points were <br /> . noted at 13-feet, 31-feet, and 37-feet bgs All the casing seams observed <br /> appeared to be in good overall condition with no evidence of breakage <br /> The cement bond log for the well showed the presence of cement from <br /> the static water level (SWL) of 10-feet to 35-feet bgs However, according <br /> to Welenco, there was less "cement effect" between 18-feet to 24-feet bgs <br /> No slots were observed in the casing to the total depth of the survey of <br /> 41-feet bgs Water apparently enters the well below this depth The <br /> pump intake was located at 41-feet bgs, which is also the depth of the <br /> obstruction encountered by the video log camera Although it is possible <br /> that this well could act as a conduit for the vertical migration of MTBE, <br /> depending on the quality of the cement seal, it is ASE's opinion that this <br /> well probably is not a significant conduit for the vertical migration of <br /> MTBE in the site vicinity <br /> 4.2 17926 South Airport <br /> The domestic well at the above address is constructed with 4 75-inch I D <br /> steel casing with an increase to an undetermined diameter at <br /> approximately 4-feet bgs Casing joints/seams were noted approximately <br /> every 3-feet Specific depths where points/seams were present included <br /> approximately 7-feet, 11-feet, 14-feet, 18-feet, 21-feet, 24-feet, 28-feet, <br /> 34-feet, 37-feet, 41-feet, 43-feet, 45-feet, and 48-feet bgs Several of <br /> these seams showed corrosion, which could cause leakage In particular, <br /> Franks One Stop Report — February 2001 <br /> -2- <br />