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.� t• £ 'ti a �,r§-,'r' ,�v r - ��'.-ra'r <br /> N."w'° ?; i Y ,- eii . ,"gy p. r-•"bKJ.+.r.r x" "'�. <br /> .7t.�' a , <br /> r <br /> e <br /> 43 Local Surface Water and Groundwater Use <br /> of Stockton obtains its municipal and industrial water supplies from a <br /> The City s ,l wells located in <br /> combination of treated surfaces water <br /> and <br /> Ac ordding en tape State of califorttta, <br /> According <br /> residential areas it: .- =+�u'i�- c records, no domestic or potable <br /> Department of Water Resources well inventory <br /> in one mile of the Greyhound facility. <br /> water supply wells are located withSITE INVESTIGATION <br /> Soil Boring and Soil Sampling Procedures were advanced to <br /> On September 16, 1991, a total of five s borings <br /> coniamination at the <br /> characterize the vertical and horizontal extent of hydrocarbon <br /> a ,s. W-3 were advanced to <br /> site. Three of the borings were :ompleted as�monitoring <br /> �and� wells at the locations <br /> 13-1 and B-2), not completed as wells, were <br /> shown an Figure 2. Each of the welts (MW-1, M <br /> a depth of 55 feet. Soil borings <br /> ngs were advanced <br /> terminated at 41.5 feet. All boriusing 6.25-inch inside diameter <br /> ID hollow-stem augers• coil samples were collected at five foot intervals using <br /> split-spoon samplingtechniques(ASTM Standard D-1586). <br /> ne were <br /> n brass <br /> Representative soil Samples leC Each samp!etwased zo sually inspected farected tsig s of <br /> tubes lining the split-spoon samp Based upon .PID readings, <br /> staining <br /> and screened for the presence of hydrocarbon odors and tht. evolution of <br /> (PID). <br /> organic vapors with boring0iO selected for c-hemical analysis and sear to a State of <br /> one soil sampleP g DHS certified hazardous waste <br /> California, Department of Health Services (DHS), l nes BTEX) <br /> total petroleum hydrocarbons (TPH)by the DHS/LUFI' <br /> laboratory to be an20zeit for <br /> benzene, toluene, ethylbenzene, and xylenes <br /> by EPA Method 89 <br /> Method(modified EPA Method 8015)• in each end of the brass tube wi'h <br /> Soil .sampling protocol consisted of <br /> cape Sail <br /> �' ittum foil and non-reactive, plastic caps. The caps were then sealed with clear <br /> nsutn endix B) accompanied each soil sample <br /> tape. A chain-of-custody record (App ra nate container at the <br /> shipment from selection and preparation of the app p <br /> laboratory, t�% the sample collection lsiCeec n int t eld fti ad not notebook, immediately <br /> l <br /> Each sample was individually labeled, Portion of the split-spoon <br /> packed in ice, sealed insie an oratatnsuThe rem�si�ningcpontainer and shipped Y <br /> overnight courier to the labrY <br /> sample was used to describe subsurfaces ata A is. Drilling logs and monitoring well <br /> construction data are presented in App <br /> prior to advancing each baring and between m rifling locations,cleaning. All dn�ldownhole <br /> cu tags, <br /> drilling equipment was decontaminated Y n a water was collected, <br /> decontamination water, development water, ::.-d purge <br /> contained,and sealed in labeled 55 gallon drums on site. <br /> Monitoring Well Construction threaded, <br /> Monitoring wells were constructed o:four-inch inThe ) <br /> final depth diameter ofborings <br /> flush joint, Schedule 40 PVC well screen and casing. <br /> e- <br /> ,�> L.ML/SY13221/OM3 REV 0 <br /> `a 3 <br /> 4 <br /> i.M <br /> A <br />