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tiY <br /> i <br /> 4. Drilling will be conducted by Stat: licensed C57 <br /> drilling company uoing a hollow stem drill rig. A field <br /> geologist will, be present to continuously log all drill <br /> ', cuttings and soil samples utilizing the Unified Soil <br /> Classification System. Descriptions of soil types <br /> encountered, sample collection intervals, boring <br /> i ' abandonment, and well construction details will be <br /> recorded on well/boring logs and included within the <br /> s-a assessment report. Cored soil samples will be collected <br /> above the water table at five foot intervals and below <br /> the water table at select intervals in accordance with <br /> fWaterWork's Soil Sampling Protocol (Appendix II) . <br /> Selected soil samples will be submitted for laboratory <br /> analysis. Selection for laboratory analysis :tidll be <br /> based upon field evidence of contamination (PID <br /> readings, discoloration, odors) and site stratigraphic <br /> changes. Analysis will be conducted for STEX and TPHG <br /> by Sequoia Analytical (DHS cert. #145). Analytical <br /> Ea methods, sample containers, holding times, and means of <br /> preservation are listed in Appendix II. <br /> 5. All drill cuttings will be placed on plastic sheeting, <br /> �.a covered with same, and remain on-site pending laboratory <br /> i results. All soils generated during drilling activities <br /> will be aerated along with excavated soils, as described <br /> sa previously in this report. To avoid cross- <br /> contamination, drilling augers will be steam-cleaned <br /> before drilling each borehole. Water used to clean the <br /> augers after drilling each boring will be collected and <br /> 3.s stored in drums approved for hazardous liquid storage <br /> pending laboratory analysis. <br /> 6. Monitoring wells will be constructed of two inch <br /> 1I diameter F480 PVC well screen/casing and completed as <br /> shown on Figure 4. The filter pack for each well will <br /> k be developed in accordance with WaterWork's Well <br /> Development Protocol (Appendix II) prior to setting the <br /> surface. seals. A neat cement mixture will be used to <br /> i seal the wells, in accordance with State of California <br /> Water Well Standards (Dec. 1981 p. 34, paragraph 4) . <br /> 7. Subsequent to installation, the wellheads will be <br /> { surveyed to Mean Sea Level Datum (MSLD) by a qualified <br /> surveyor. Depth to water readings will be used to <br /> determine the groundwater flow direction beneath the <br /> �t <br /> project site. Groundwater monitoring will be conducted <br /> in accordance with WaterWork's Groundwater Monitoring <br /> Protocol (Appendix II). <br /> i <br /> 4 <br /> t�� <br />