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4 v <br /> 2.19 .Tanuary 2001 .Video and Cement-bend Leg SurveT <br /> In January 2001, video and cement-bond logs were collected for the wells <br /> located at 17950, 17926, 17904, 17933 and 17886 Airport Way The <br /> total depths of the wells ranged from 46-feet bgs to 84-feet bgs With t h e <br /> exception of the irrigation well located at 17886 Airport Way, no slots <br /> were visible in the well casings, and water appeared to enter most of these <br /> wells through an open hole beneath the bottom of the casings With the <br /> exception of the well located behind the easternmost residence at 17933 <br /> Airport Way, all of the wells videologged appeared to have at least some <br /> form of a cement seal <br /> 2.20 January 2001 CPT Drilling North, .,,of the Site <br /> In January 2001, ASE drilled ten soil borings in off-site locations north of <br /> the site in an attempt to further define the horizontal and vertical extent <br /> of contamination (Figure 4) <br /> The groundwater samples collected from 15-feet bgs in boring CPT-26, <br /> located on the vacant lot on the northeast corner of the Airport Way a n d <br /> West Yosemite Avenue intersection, contained 630 ppb TPH-G, 54 p p b <br /> benzene, 1,400 ppb MTBE, 90 ppb TAME, and 160 ppb TBA Groundwater <br /> samples collected from 41-feet bgs in this same boring contained an even <br /> higher MTBE concentration of 2,600 ppb, however, no compounds other <br /> than MTBE were detected Groundwater samples collected from 91-feet <br /> bgs and 103-feet bgs in this boring contained 58 ppb and 3 ppb MTBE, <br /> respectively The groundwater sample collected from 103-feet bgs also <br /> contained 1 2 ppb 1,2-DCA <br /> The groundwater samples collected from CPT-18, further downgradient, <br /> contained MTBE concentrations of 92 ppb, 75 ppb, 3 7 ppb and 21 ppb at <br /> depths of 16-feet bgs, 38-feet bgs, 57-feet bgs and 97-feet bgs, <br /> respectively The groundwater samples collected from 38-feet bgs a n d <br /> 97-feet bgs also contained 0 59 ppb and 0 69 ppb 1,2-DCA, respectively <br /> The only compound detected in groundwater samples collected from <br /> boring CPT-17, crossgradient to the southwest from CPT-18, was 1 2 ppb <br /> MTBE in the sample collected from a depth of 38-feet bgs No MTBE, o r <br /> any other compound, was detected in groundwater samples collected <br /> from 16-feet bgs, 63-feet bgs and 92-feet bgs <br /> No compounds were detected in any of the groundwater samples collected <br /> from boring CPT-21, crossgradient of boring BH-17 to the northeast <br /> Frank's One Stop Remedial Action Plan — August 2001 <br /> -9- <br />