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k4 KLEiNFELDER • Once the monitoring wells were installed, the top of each well was surveyed (by Stantec, Inc., Modesto, California) so that depth to groundwater measurements in the wells could be converted to groundwater elevations used to assess groundwater gradients. The wells were surveed by al able shows they moniit rnlgbwelPositing l elvation, asemeasured ite (GPS) from technology. ethe top following teach of the well casings. Text Table 3 Monitoring Well Elevations Location TOC Elevation (f et, MSL) MW-1 50.996 MW-2 50.804 MW-3 46.475 MW-4 74.450 MW-6 40213 MW-7 456 MW-8 50.198 50.624W • TOC =Top of well Casing MSL = Mean Sea Level `= Elevation from Top of Well Monument 3.1.3. MONITORING WELL DEVELOPMENT Following a minimum of 48 hours after installation, the monitoring wells were developed to remove silt and clay from the well bore and to effectively increase the hydraulic radius of each monitoring well. Surging along the screened interval of the wells was performed to set the sand pack during installation and again during the development stage. The monitoring wells were developed as described in Appendix C Section C.3.2. The discharge was periodically monitored for clarity, pH, temperature, and specific conductance. The was ed to the d surface in such a manner as not Ito allowpthendischargeurge ator enteranysugrface waternbody or flow back into the monitoring wells. 3.1.4. GROUNDWATER SAMPLING Groundwater was sampled from the newly installed monitoring wells on February 14, 15, and 16, 2006. Water level measurements were made in the monitoring wells prior to purging and sampling the wells according to the protocol described in Appendix C Section C-4.1 . The following Text Table 4 outlines the groundwater elevations observed in the monitoring wells. Page 8 of 20 63138.H01/ST06R312/JDZ:ly April 7,2006 ©2006 Kleinfelder, Inc.