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.} 1 . 0 INTRODUCTION This report presents the methods and findings of Aqua Science Engineers, Inc (ASE)'s video log and cement-bond log assessment of area domestic and irrigation wells within the general vicinity of Frank's One Stop located at 2072 West Yosemite Avenue in Manteca California (Figures I and 2) The wells surveyed for this project were the four domestic wells where methyl tertiary butyl ether (MTBE) was detected in groundwater samples at concentrations exceeding the maximum contaminant level for drinking water These wells are located at 17950, 17926, 17904 and 17933 Airport Way Also included were the two wells located at 17886 Airport Way On the 17886 Airport Way property, groundwater samples collected from the irrigation well contained low MTBE concentrations However, groundwater samples collected from the domestic well on the same property did not contain detectable MTBE concentrations The purpose of conducting the survey on these wells was to determine whether well construction plays a role in why MTBE was detected in one well and n o t the other, and to determine whether the domestic well has a proper seal to allow the well to be placed back into service 2 . 0 DOMESTIC WELL ASSESSMENT PREPARATION On January 11 and 12, 2001, Zim Industries (ZIM) of Fresno, California prepared one (1) irrigation and five (5) domestic wells for video and cement-bond logging To prepare the wells, ZIM personnel opened the wells to be surveyed and removed the well pump and piping All well casings were determined to be steel and were cleaned using a steel-wire brush to remove rust, silt and organically derived deposits that may have accumulated over time This allowed the actual steel of the casing to b e viewed during the video logging to better determine the construction of the wells After brushing, water was removed from the well using airlift- technology until the water being removed from the well was clear Notes regarding the condition of the wells upon first inspection during the preparation of the wells and depths of the pump intakes are presented in Appendix A 3 . 0 VIDEO LOGS AND CEMENT-BOND LOGS On January 22 and 23, 2001, Welenco, Inc of Bakersfield, California collected video log and cement-bond log data from one (1) irrigation a n d five (5) domestic wells The video logs were collected using a down-hole video camera capable of both down-hole and side-view camera angles Welenco's notes and photographs collected during the video logging are Franks One Stop Report — February 2001 - I -