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10 February 2006 <br /> • AGE-NC Project No 02-0977 <br />' Page 4 of 12 <br /> I The soil boring for MW-8 was single-completed as a ground water monitoring well and the soil <br /> borings for B6(VW-2), B7(VW-1), B8 (VW-3)and B9(VW-4)were each single-completed as soil <br /> vapor extraction wells utilizing an assembly of 2-inch diameter,schedule 40,blank polyvinylchloride <br /> (PVC) well casing and perforated, 2-inch diameter PVC well casing(0 020-Inch slot) <br /> Each well was Installed by placing the PVC well casing assembly through the hollow stem of the <br />' augers to the total depth of each boring The augers were Incrementally raised as No 3 Lonestar Lapis <br /> Luster sand (filter pack)was slowly poured down the annulus between the well casing and the Inner <br /> wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from the <br /> I bottom of the boring to a point approximately two feet above the top of the screen,following the filter <br /> pack placement (MW-8 only), a surge block was inserted into the well casing and was alternately <br /> raised and lowered(surged)repeatedly for approximately 20 minutes Approximately two to three feet <br /> I of bentonite chips(transition seal)were placed above the filter pack and were hydrated with clean tap <br /> water The remaining annular space was backfilled with portland type II cement (grout seal) Well <br /> construction details are summarized in Table 1,as-built well construction diagrams for wells VW-I <br />' through VW-4 and MW-8 are included as Figures 4 through 8, respectively <br /> . 2 1 5 Monitoring Well Development <br /> On 22 December 2005, monitoring well MW-8 was developed by utilizing (1) a 2-inch diameter, <br />' stainless steel hand bailer and (2) a Watera-Hydro-Lift II (Inertia) pump to ball and hydro-lift any <br /> remaining sediment accumulated at the bottom of each well Ground water was bailed and/or hydro- <br /> lifted from each monitoring well until ground water was visually sediment free, approximately 15 <br /> gallons of water was removed from well MW-8 Purged ground water was containerized in properly <br /> labeled D O T -approved model 17H 55-gallon drums and was stored on-site in an area lacking public <br /> access Field data and logs are Included with Appendix E <br />' 2 16 Surveying of Monitoring Wells <br /> On 24 January 2006, a California state-licensed survey engineer from Baumbach & Piazza (B&P) <br /> I surveyed a reference point on the casing top of wells VW-1 through VW-4 and MW-8 to the nearest <br /> 0 01-foot relative to City of Lodi Benchmark Datum No 563 (NAD83) Additionally, B&P utilized <br /> global positioning system (GPS) techniques to identify latitude and longitude for tracking wells <br /> I MW-1 through MW-8 and VW-1 through VW-4 on the State Water Resources Control Board <br /> (SWRCB) GeoTracker database system The results of the monitoring well survey are contained in <br /> Table 1, GeoTracker confirmation pages of the submitted GPS well casing survey EDF files are <br /> included in Appendix C, the surveying report (97970-05) is presented in Appendix D <br /> Advanced GcoEnvironmental,Inc <br />