ARCHIVED REPORTS XR0007976 - Laserfiche WebLink

Home Browse Search

1 ' 04 August 2000 AGE-NC Project No 97-0300 ' Page 4 of 10 ' filter pack placement, a surge block was inserted into the well casing and was alternately raised and lowered(surged)repeatedly for approximately 20 minutes Two feet of bentonite chips(annular seal) were placed above the filter pack and were hydrated with clean tap water The remaining annular ' space was backfilled with portland cement (grout seal) As-built monitoring well-construction diagrams are included as Figures 5, 6 and 7 2 1 5 Surveying of Monitoring Wells ' On 02 August 2000, a California state-licensed survey engineer from Baumbach & Piazza, Inc surveyed a reference point on the casing top of wells MW-1, MW-2 and MW-3 to the nearest 0 01-foot relative to the City of Stockton Bench Mark Datum BM#46 The results of the monitoring ' well survey are contained in Table 4 The surveying report (Baumbach &Piazza Job No 9797) is presented In Appendix B ' 2 1 6 Well Development Activities s lie On 09 June 2000,monitoring wells MW-1, MW-2 and MW-3 were developed utilizing a stainless steel hand bailer and a submersible pump ' Initially, a stainless steel hand bailer was utilized to remove sediment settled at the bottom of each well casing Following hand balling activities, ground water was purged from each monitoring well utilizing a submersible pump until ground water was visually sediment free, approximately 16 to 30 gallons of water were removed from monitoring wells MW-1, MW-2 and MW-3 during development Purged ground water was containerized in properly labeled D O T -approved model I 17H 55-gallon drums and was stored on-site in an area lacking public access Monitoring well field logs for development activities are included in Appendix C, ground water elevations from the well development activities were plotted and contoured on a scaled site plan (Figure 8) 22 STRATIGRAPHY Generally, brown/gray, dam to moist, fine sand silt was encountered at 5 and 10 feet bsg At P Y g depths of 15, 20 and 25 feet bsg, a brown/gray, damp to moist, silty fine sand was encountered A Ibrown-gray, damp to moist, fine sandy silt was encountered at depths of 30, 35, 40 and 45 feet bsg A brown-gray, saturated, silty fine sand was encountered at a depth of 50 feet bsg A gray-brown, I saturated, fine sandy silt was encountered at depths of 55 and 60 feet bsg At depths in excess of 65 feet bsg, a brown, saturated, gravelly fine to coarse sand was encountered • Advanced Geo Environmental,Inc