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20 September 2000 <br /> AGE-NC Project No 97-0333 <br /> ' Page 4 of 11 <br /> ' lowered(surged)repeatedly for approximately 20 minutes Two feet of bentonite chips(annular seal) <br /> were placed above the filter pack and were hydrated with clean tap water The remaining annular <br /> space was backfilled with portland cement (grout seal) As-built monitoring well-construction <br /> diagrams are included as Figures 5, 6, 7, 8 and 9 <br /> ' 2 15 Surveying of Monitoring Wells <br /> On 25 July 2000,a California state-licensed survey engineer from Baumbach&Piazza,Inc surveyed <br /> ' a reference point on the casing top of wells MW-1, MW-2, MW-3,MW-4 and MW-5 to the nearest <br /> 0 01-foot relative to the City of Manteca Bench Mark Datum BM#48 The results of the monitoring <br /> well survey are contained in Table 4 The surveying report (Baumbach & Piazza Job No 9797) is <br /> ' presented in Appendix B <br /> 2 1 b Well Development Activities <br /> '• On 03 July 2000, monitoring wells MW-1, MW-2, MW-3 and MW-4 were developed utilizing a <br /> stainless steel hand bailer and a submersible pump, monitoring well MW-5 was developed on i l <br /> July 2000, also utilizing a stainless steel hand bailer and a submersible pump <br /> ' Initially, a stainless steel hand bailer was utilized to remove sediment settled at the bottom of each <br /> well casing Following hand bailing activities, ground water was purged from each monitoring well <br /> ' utilizing a submersible pump until ground water was visually sediment free, approximately 25 <br /> gallons of water were removed from each monitoring well during development Purged ground water <br /> was contamenzed in properly labeled D O T -approved model 17H 55-gallon drums and was stored <br /> ' on-site in an area lacking public access Monitoring well field logs for well developmental activities <br /> are included in Appendix C, ground water elevations from the well development activities were <br /> plotted and contoured on a scaled site plan (Figure 10) <br /> 2 2 STRATIGRAPHY <br /> ' Generally, a brown, damp to moist, medium dense fine sand was encountered at 5 and 10 feet bsg <br /> A brown and gray, inoist to ,cry moist, very stiff, fine sandy, clayey silt was encountered at 15 feet <br /> ' bsg A gray-brown, moist to saturated, medium dense to dense, silty sand was encountered at 20 25 <br /> and 30 feet bsg <br /> Satui atcd ,,oil waL, Piro t ncniinlotc d ii ,i depth of)0 fcct hsg to borings MW-1 and \T�k-5, ai d CIL, 117 <br /> ' td%aner d4 cOUii1iiUllnuot,1 11i <br />