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Consultants 2500 Camino Diablo,Walnut Creek, CA 94597 rEnvironmental &Engineering Services Tel: 925.746.6000 Fax: 925.746.6099 July 1, 2011 Mike Infurna, Senior REHS San Joaquin County Environmental Health Department 600 East Main Street Stockton, CA 95202 Subject: Work Plan for Subsurface Investigation and Letter of Intent 4421 Giannecchini Lane Stockton, California AEI Project No. 297937 Dear Mr. Infurna: The following work plan has been prepared by AEI Consultants (AEI) as a part of the drilling permit application process required by the San Joaquin County Environmental Health Department (EHD) to perform a subsurface investigation at the above referenced site. The scope of work outlined herein was requested to determine whether or not the subsurface has been impacted by the former chrome plating operations. This work is intended as a "presence/absence" investigation designed to determine whether or not impacts exist. As requested by the EHD: • AEI understands that the EHD does not direct the work of the investigation. • All results of the investigation will be submitted to the EHD within 60 days of the sampling event. • If the results of the investigation show that contamination is present, AEI understands that regulator oversight will be necessary for future work. I Site Description and Background The property is located along Giannecchini Lane between Lycoming Street to the south and Boeing Way to the north in Stockton, California (Figure 1). The property contains a light industrial concrete tilt-up building. The building previously housed Advanced Metal Plating, a chrome plating operation. The building consists of office areas and warehouse areas. An asphalt parking lot is located in the southern part of the property. Landscaping is located along the east side of the property. The property is located at an elevation of approximately 25 feet above mean sea level and slopes to the southwest towards French Cam Slu which is located approximately 2 miles southwest of the.property. A Phase I Environmental Site Assessment (ESA) was performed by GaiaTech, Inc. as detailed in a report dated May 2011. The Phase I ESA recommended, based on recognized environmental conditions, that a Phase II Investigation be performed to evaluate if the subsurface has been impacted by the former chrome plating operations in Suite 400. The chrome plating operations San Francisco(HQ)I Atlanta I Chicago I costa Mesa I Dallas I Denver I Los Angeles I Miami I New York I Phoenix I Portland I San Jose www.aelconsultants.com