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IZF <br /> Ml— <br /> , die' NMI <br /> B. monitoring well Installation <br /> 1• Prior to initiating any field activities, Underground <br /> Service Alert (USA) will be contacted to locate underground <br /> Utilities at the site. <br /> 2. one Boll boring will be drilled to a depth of 15 feet <br /> below the water table to provide for Installation of a <br /> groundwater monitoring well. Depth to water recorded on our may <br /> 1988 monitoring was approximately to feet below grade at the <br /> site. Drilling will be conducted with a hollow stem auger drill <br /> rig under a California C57 license, as required. To define the <br /> lateral extent of potential groundwater contamination in the down <br /> gradient direction, the monitoring well will be <br /> gradient of the former tank pit and HW4, which is todown <br /> contaminated (Figure 5) . The well will be constructed of two <br /> Inch F400 PVC casing and completed as shown on Figure 6. <br /> 3• Soil samples will be collected during drilling at a <br /> minimum of five foot intervals starting at five feet below grade <br /> for field characterization. eca s the :soil cam n <br /> fxoszpNi� 9ocatecl ad acent to and'.8o i zed <br /> t, not detect the resents of h Q _o. .t f e former _ an <br /> e 'Pro o e oar n w e o s ro <br /> 0 rte s a er.. from <br /> not to con uct laboratory testing on samplesuchcollectewe d from this <br /> boxing unless field evidence by visual and olfactory Inspection <br /> detects the presence of hydrocarbon contamination. Samples would <br /> be analyzed for BTX and TPN by DOHS methodology. <br /> 9• Subsequent to Installation, the wellhead of the newly <br /> installed monitoring well will be surveyed to the existing <br /> wellhead elavation. Groundwater levels will be monitored In all <br /> wells to determine depth and permit calculation of the gradient. <br /> 5• A water sample will be collected from the monitoring <br /> well after purging a minimum of four well volumes (casing and <br /> sand pack) . The purged water will remain on site, in secured 55 <br /> gallon drums, until laboratory results are received, if <br /> necessary, a proposal for the disposal of the water produced <br /> during well development will be prepared after reviewing the <br /> sample results. water samples will be analyzed by a state <br /> cewrtified laboratory--.for--BTX and...TVH...by-EPA-method-602.-- - <br /> - .. <br /> 6. A brief report will be prepared summarizing the <br /> findings of the investigation and recommendations for further <br /> site characterization or remedial action, if appropriate. The <br /> field Investigation will be conducted under the direct <br /> supervision of Russell w. Juncal, a California registered <br /> geologist (no. 3869) who will also review and sign the summary <br /> report. <br />