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I <br /> S� <br /> 9 <br /> Locations of wells within one mile of the project site as <br /> F recorded by the Department of Water Resources (DWR) are <br /> plotted on Figure .3. A water well (well #1N6E-11E2), <br /> drilled to a depth of 215 feet and cased to 170 feet is <br /> located on the police facility property. The drillers log <br /> for this well is presented in Appendix 1. <br /> 3.0 Investigation Procedures <br /> 3.1 Drilling <br /> On October 19, 1989, a soil boring .was drilled to a total' <br /> depth of 55.0 feet below . grade to facilitate the <br /> �.s installation of a groundwater monitoring well (MW1') . <br /> � . Drilling was conducted with a B-61 rig using ten inch (O.D. ) <br /> hallow-stem augers. The drilling was performed under the <br /> direction of a field geologist who maintained a continuous <br /> I log of the material encountered using the. , Unified Soil <br /> Classification assification System (Appendix I). The well boring- g; was <br /> 'located as close as possible: to. the.area ok suspected soil <br /> contamination' between product line samples #}2 end #s'a The <br /> well was constructed of two inch diameter flush threaded <br /> F480 PVC screen/casing. No glues or solvents were used in <br /> well construction. Monterey silica sand (#3) was placed in <br /> b the annular space around the .020 inch slotted screen. A <br /> � + two foot bentonite seal was placed above the sandpack prior <br /> to surface sealing with neat cement. Spacific well <br /> { construction details are presented in Appendix I. The <br /> location of the well is... shown on Figure 2. 'The "drill <br /> cuttings:_Vete, on. an asphr l M surface adjapent, to. the, <br /> �., boring and covered.. with plastic- Sheieting so31 cutting's' <br /> ! y weirs disposedof at a chess il. landfill-after `review of :the s � <br /> Pi <br /> anal�rtical• results indicated, non^detectable, levels in 'all' h� <br /> semplea: Subsequent to completion, depth to groundwater was �o <br /> measured in accordance with WaterWork"s Groundwater <br /> EMonitoring Protocol (Appendix I1). The groundwater <br /> monitoring data is presented in Table 1. <br /> fa: <br /> 3.2 Soil &a:npling <br /> Grab samples of cuttings were logged continuously during <br /> ! i drilling for identification of stratigraphy and detection of <br /> hydrocarbon contamination. Field screening of volatile <br /> organic vapor emitted from the soils was conducted with a <br /> photoionization detector (PID). The PID readings are shown <br /> on the well log (Appendix I). Discreet samples were <br /> taken at five foot intervals starting at ter. feat below <br /> grade. These samples were collected in two inch diameter <br /> ----brass-tubes--using--a-California-modified sampler:- -Samples - — <br /> were collected, preserved and transported ander chain-of- <br /> custody in accordance with WaterWork's Soil Sampling <br /> Protocol ;.(APPendix..::al) .,... The,:.88mp1®s. wero:`ana1 ed fox' <br /> benzene, toluQne; ethy!benzen® xyler�q (BTEX). by :EPA: <br /> 8020 <br /> J. and'`'tatal' petroleum hydrocarbons i gasoline (TPHG) by <br /> 2 ,� <br /> _. _Z, <br /> r <br />