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ik4 KLEINFELDER tMonitorinq Well Development A minimum of 48 hours after installation, the monitoring wells will be developed to remove fine silt from the well bore and to effectively increase the hydraulic radius of each monitoring well. Surging along the screened interval of the well will be performed to set the sand pack. The monitoring wells will be developed as described in Appendix B Section A.3.2. In addition to developing the monitoring wells until the discharge runs relatively clear of fines, the discharge will be periodically monitored for pH, temperature, and specific conductance. The well development purge water will be contained in 55-gallon drums pending chemical analysis and proper disposal by the client. Monitoring Well Sampling Groundwater samples will be collected from the three new monitoring wells and the wells will be incorporated into a quarterly groundwater monitoring schedule. It is anticipated ' that the three new monitoring wells will be sampled during the Fourth Quarter 2005 groundwater monitoring event. Water level measurements will be made in the monitoring wells prior to development, purging and sampling the wells. The depth to groundwater will then be measured in each well according to the protocol described in Attachment B Section B-4.1. Approximately three to five well volumes will be purged and samples will be collected as described in Attachment B-4.2. Each of the water samples collected for quantitative analyses will be submitted under chain-of-custody control to a laboratory certified by the State of California Department of Health Services (DHS) for the requested analyses. Monitoring Well Soil and Groundwater Sampling Analyses After collection, the soil samples from the well borings will be labeled, logged on a chain- of-custody, and immediately stored in an iced cooler. Six soil samples (two from each well boring) will be submitted to a State certified laboratory and analyzed for the following analyses: • Total Purgeable Petroleum Hydrocarbons [C4-C10] including Benzene, Toluene, ' Ethylbenzene, Xylenes [BTEX] by EPA Method 8260 • Total Extractable Petroleum Hydrocarbons [C10-C40] by EPA Method 8015M 1 After monitoring well installation and development three groundwater samples will be collected during the fourth quarter monitoring event and analyzed for the following: • Total Purgeable Petroleum Hydrocarbons [C4-C10] including Benzene, Toluene, Ethylbenzene, Xylenes [BTEX] by EPA Method 8260 44843.T04/STO5R1333/DH:Iv Page 12 of 17 ©2005 Kleinfelder, Inc. October 25, 2005