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KLElNFELDER EXPECT MORE- 1 GENERAL INFORMATION The Oakwood Lake Water District Waste Water Treatment Plant (WWTP) is located at 874 East Woodward Avenue in Manteca, California. The WWTP, located in the southwest portion of the site is bordered immediately to the west by the San Joaquin River and to the south by Walthall Slough. The site is bordered to the north by the Union Pacific Railroad, beyond which is Highway 120. Agricultural land and residential development are noted east of the site. South and southeast of the eastern portion of the site is Woodward Avenue, agricultural land and rural residential properties. The site is located in Section 10 and 11 of Township 2 South, Range 6 East, Mount Diablo Baseline and Meridian, San Joaquin County, California. The Oakwood Lake Water District (OLWD) and Beck Properties, Inc. (Beck), are proposing installation of additional effluent storage ponds and land application areas to receive tertiary treated water from an updated WWTP. The Regional Water Quality Control Board (RWQCB) is requesting an expansion of the existing groundwater monitoring network, at the proposed pond locations and land application areas to ensure that background water quality is adequately characterized and the potential water quality impacts from the holding ponds and tertiary effluent are monitored. The RWQCB mandates discharge water may not cause degradation of groundwater and requires additional monitoring in the vicinity of proposed effluent storage ponds and larger land application areas. The RWQCB has stated smaller land application areas will not require direct monitoring. Please note this workplan is being prepared in according with Provision G.1.b of the Waste Discharge Requirements (WDRs) contained in Order No. R5-2006-0114. The following workplan format is based on the RWQCB Attachment F of this order. Therefore the sampling and analyses plan is located in Attachment A. Additional information including background information (Attachment B), summary of WWTP operations (Attachment C) and Kleinfelder's Typical Protocol (Attachment D) have been included to provided additional information. Kleinfelder's workplan reflects the desires of the client and requirements of the RWQCB. This workplan is subject to the limitations presented in Chapter 7. Any other party (other than Oakwood Lake Water District, Beck Properties Inc., or regulatory agencies having enforcement jurisdiction for the site) who would like to use this document shall notify Kleinfelder, Inc. in writing requesting permission. 1.1 PURPOSE OF WORKPLAN The purpose of this workplan and the proposed additional monitoring well network is designed to initially monitor pre-existing background groundwater conditions in areas of 48093.E01/ST07R052/CJC/Iv Page 1 of 15 ©2007 Kleinfelder, Inc January 26, 2007