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KL E/NFEL DER Bright Penple.Bigh[Solutions. WORK PLAN Limited Soil Assessment Phosphoric Acid Spill Area Applied Aerospace Structures Corporation 3437 Airport Way Stockton, California INTRODUCTION Kleinfelder understands that an approximate 5,000-gallon above-ground bath tank (ABT) located within an Applied Aerospace Structures Corporation (AASC) process area released approximately 1,500 gallons of a 10 percent phosphoric acid solution with potential aluminum and copper contaminants. Piping from the ABT (piping route) was routed through two 1'/2-inch diameter, parallel PVC pipes which trend north from the tank to an outside chiller adjacent the north building wall. The pipelines were approximately 10 feet long between the ABT and the chiller. Approximately half of the acid was recovered through an open, concrete-lined utility conduit which was exposed on the exterior of the north wall approximately 6 feet west of the chiller and exterior acid piping. The conduit trended north and south, and acid was recovered from this conduit according to AASC. This work plan provides a scope of environmental services for the purpose of evaluating the vertical and lateral extent of the phosphoric acid, aluminum, and copper in soil along the release area. The assumed release area is estimated at piping joint/s located just exterior to the north structure wall near a chiller unit. Spillage may also have occurred along the piping route between the ABT and the north building wall and the concrete utility conduit area located west of the pipeline route. Based on an existing monitoring well network at the Site, Kleinfelder understands depth to groundwater is approximately 40 feet below ground surface (bgs) with an east to southeasterly flow direction. We also understand remedial extraction wells are also present at the Site, which may influence groundwater flow direction. PROPOSED SERVICES This following scope of work includes pre-field activities, soil sampling, laboratory analyses and reporting, based upon our understanding of current Site conditions, our Site visit and information provided to Kleinfelder from AASC: Task 1 — Permitting and Pre-Field Activities San Joaquin County Environmental Health Department (EHD) requires completion of a well/boring permit for the site and payment of fees prior to installation of the proposed boring/well. Kleinfelder will prepare the permit application for submittal to EHD along 95642.ENV/ST09P060 Page 1 of 6 April 2, 2009 Copyright 2009 Kleinfelder