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' Geosyntec° consultants INTRODUCTION ' This Former North and South Pond Areas Characterization Work Plan (Work Plan) details the objectives of and methods for characterizing soil beneath the two former ponds at the Western Farm Service, Inc. (WFS) facility in Stockton, California (the ' "Site"). Geosyntec Consultants (Geosyntec)prepared this Work Plan on behalf of WFS in response to a request by the California Regional Water Quality Control Board, Central Valley Region (RWQCB) in a letter dated 25 April 2008 which also included ' revisions to the existing monitoring and reporting program (MRP No. R5-2004-0804) (RWQCB, 2008). 1.1 Project Obiectives The two former ponds were closed sometime between 1985 and 1993 under RWQCB supervision. The closure process included soil excavation and covering the area with an engineered cap. The objective of this Work Plan is to assess whether chemical residues are present in soil beneath the former ponds, and if present, are an on-going source of chemicals of concern (COCs) to groundwater. To achieve this objective, soil and ' groundwater samples will be collected from beneath the former North and South Ponds without compromising the existing caps covering these two areas. ' 1.2 Report Organization ' This Work Plan is organized as follows: • Section 2 provides background of the Site, including the history of the ' former North and South Ponds and the COC concentrations in groundwater in the vicinity of the former ponds. ' • Section 3 details the proposed soil and groundwater field investigation activities. • Section 4 provides the schedule for the proposed field investigation activities and results reporting and the estimated cost to complete these activities. • Section 5 provides a list of documents referenced in this Work Plan. ' Work Plan_Stockton Pond 1nv_01-07-08 1 01.07.08