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QUAMERLY GFKXJNDWA7ER MOWFMNG AND <br /> MONn MNG WELLINSTALLAYION F*33( T <br /> 1399 East Yosemite Avenue Manteca.CalRomla <br /> 5.0 DRILLING AND INSTALLATION OF MONITORING WELL MW-6 <br /> ' On April 16, 1993, Aegis supervised the drilling of sod boring MW-6 using 10 25-inch <br /> diameter hollow-stem augers, at the location shown on Figure 2 The soil boring was <br /> ' drilled, logged and sampled to 36 5 feet below grade (bg), according to the Aegis SOP <br /> included in Appendix A, and completed as a 4-inch diameter groundwater monitoring well <br /> ' <br /> During drilling, subsurface soils were sampled at 5-foot intervals A soil boring log and <br /> well construction details are included in Appendix C Sod samples were screened in the <br /> Meld, using a portable photoionization detector (PID) Results of PID screening are <br /> ' reported on the boring log <br /> Sods encountered in the subsurface were predominantly sands to 23 feet bg, a silt to <br /> sandy silt horizon occurred from 23 to 28 feet bg, and sand was observed from 28 feet <br /> to total depth The saturated zone was encountered at approximately 27 feet bg <br /> A total of four soil samples were submitted for analysis to Pace Incorporated (Pace) of <br /> Novato, California, a state certified laboratory, for concentrations of a) TPH, as gasoline, <br /> by EPA Method 8015; and b) BTEX, by EPA Method 8020 The sod sample analytical <br /> results are summarized in Table 3 The sod sample laboratory report and chain-of- <br /> custody form are included in Appendix B None of the soil samples from MW-6 contained <br /> TPH, as gasoline, concentrations above minimum laboratory detection limits <br /> The perforated well casing in MW-6 was set from 15 to 36 feet bg The well was capped <br /> with a locking wellhead cap and secured by a water-tight traffic rated wellhead vault. The <br /> ' top-of-casing elevation was surveyed relative to the other on site wells (referenced to <br /> mean sea-level) by Aegis personnel on April 30, 1993. <br /> The drill cuttings and development water generated during the monitoring well installation <br /> were temporarily stored on site pending laboratory analysis. The drill cuttings were <br /> sampled (SP-1) and analyzed for TPH, as gasoline, BTEX, lead, and reactivity, corrosiv+ty, <br /> and ignitibdity (RCI) <br /> i <br /> 1 <br /> 1 <br /> M <br /> go-ME OM R 3- <br />