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7.01/03/2008 15:18 209835 �5 2098350675 PAGE 18 <br />t <br />GEOTECHNICAL <br />,ENGEU ENVIRONMENTAL <br />WATER RESOURCES <br />N C U R P O R A T E D CONSTRU'CTION SERVICES <br />Project No. <br />811.2.000.000 <br />December 20, 2007 <br />Mr. Don Oliver <br />Valley Organics, Inc, <br />12900 N. Lower Sacramento Road <br />Lodz, CA 95242 <br />Subject: Green Waste Composting Facility <br />Lathrop, California <br />Reference: 1✓NGEO Incorporated; Workplan for Well -Radius Search and Groundwater <br />Sampling, Green Waster Composting Facility; December 20, 2007. <br />Dear Mr. Oliver: <br />As you requested, ENGEO Incorporated is pleased to present this Workplan Addendum <br />(Addendum) to the referenced workplan (Workplan) for the subject property located at <br />920 W. Frewert Road in Lathrop, California (herein referred to as the "Site'. As requested by the <br />Regional Water Quality Control Board (RWQCB), Central Valley Region, this Addendum <br />describes Geoprobe groundwater sampling at three locations on the Site in lieu of sampling the <br />existing on-site well as described in the original Workplan. In addition, this Addendum <br />incorporates the gathering land uses and surface drainage characteristics data for the area within a <br />`/z -mile radius of the Site. <br />FCORTUUTHO <br />This Addendum provides supporting information for the application by Valley Organics Inc. to <br />conduct green waste composting operations at the Site, Tice purpose of this Addendum and <br />accompanying Workplan is to gather groundwater data useful for evaluating baseline groundwater <br />conditions for fixture comparison and evaluation of potential risks and groundwater affects from <br />facility operations. The Addendum and Workplan define sampling rationale, locations, and number <br />of samples to collect, Feld techniques to be utilized and analytical procedures. <br />Purpose and_Scope <br />The purpose of this Workplan is to present the sampling and analysis rationale and investigation <br />protocols specific for the Site. The objective of the Addendum and Workplan is to provide data to <br />be utili7..ed in future evaluation of potential affects on groundwater in the local area. <br />580 N. Wilma • Suitc A • Ripon, CA 95366 • (209) 835-0610 • Fsx (888) 279-2698 <br />www.engeoxom <br />