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groundwater contaminationI.1 is not anticipated, one soil ( 3 S <br /> boring may be completed asia groundwater monitoring well due <br /> to the relatively shallow depth to groundwater, if required , �'oCl <br /> Underground utilities willj$ be located by Underground Service W <br /> Alert prior to commencement ofdrilling activities . <br /> Work will commence on thee!site within 30 days of receiving <br /> workplan approval . We anticipate it will take two days for <br /> soil boring installation and one day for groundwater well <br /> development and sampling, if required . A drill rig will be <br /> scheduled upon approval ofjthe :workplan and the 'San Joaquin <br /> ` County Public Health Services Environmental Health Division <br /> will be notified 48 hours in advance of site work . <br /> Drilling will be conducted by :a qualified driller under a <br /> C57 license using a hollow` stem auger drill rig If a well <br /> is required it will be constructed of 2 inch diameter F480 <br /> PVC screen/casing. Typiea;l completion will be as shown on <br /> Figure 3 . Actual completion depths will be determined in <br /> the field based on hydrogeologic conditions encountered . <br /> Drill cuttings will be logged continuously for <br /> characterization of contamination and soil type using the <br /> Unified Soil Classification System. Descriptions of soils <br /> encountered and monitoring , well construction details will be <br /> recorded on boring/well ;flogs and included within the <br /> assessment report . Soil samples will be collected from each <br /> boring at five foot intervals . Sample collection will begin <br /> at a depth of five feet; no soil samples will be collected <br /> for laboratory analysis below the groundwater table . <br /> Soils encountered will be !lmonitored for organic vapors by <br /> placing a small amount of representative material in a <br /> sealed container, then measuring the concentration of <br /> volatiles collected in the :head spaced of the container with <br /> a photoionization detectori, (PID) calibrated to the benzene <br /> molecule . The values obtained at each measurement point <br /> will be recorded on the boring logs . <br /> ji <br /> Soil cuttings generated duringthe drilling process will <br /> also be screened for the presence of volatile organics using <br /> a PID. <br /> Id <br /> Soil samples submitted fors analysis will be selected based <br /> on obvious signs of contamination ( i . e . PID readings and <br /> soil discoloration) . The ';sample recording the highest PID <br /> reading will be analyzed to determine contamination levels . <br /> Two "clean" confirmation samples, representing �a 10 foot <br /> interval, will be collected and analyzed to determine the <br /> vertical extent of the soil contamination. Samples will be <br /> collected, preserved and transported under chain-: of-custody <br /> in accordance with WaterWork ' s Soil Sampling Protocol <br /> 5 <br />