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k'q KLEINFELDER ATTACHMENT A SCOPE OF WORK FORMER UNDERGROUND STORAGE TANK SITE 212 INDUSTRIAL DRIVE STOCKTON, CA 95206 INTRODUCTION Kleinfelder is pleased to present this workplan to Wilbur-Ellis Company. This workplan was developed after correspondence with Ms. Jan Thompson, using Kleinfelder's current understanding of the site conditions, and is a preliminary understanding of Wilbur-Ellis Company's desires and requirements. Kleinfelder has prepared this document to address information usually requested in a workplan by The San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD) and the State of California Regional Water Quality Control Board (RWQCB). Kleinfelder is committed to providing quality service to its clients, commensurate with their wants and needs and desired level of risk. If a portion of this workplan does not meet the needs of Wilbur-Ellis Company, or if those needs have changed, Kleinfelder will consider appropriate modifications, subject to the standards of care to which we adhere as professionals. Modifications such as changes in scope, methodology, scheduling, and contract terms and conditions may result in changes to the risks assumed by Wilbur-Ellis, as well as adjustments to our fees. We look forward to the opportunity to serve you. BACKGROUND The following information was obtained from excerpts of previous soil and groundwater assessment reports prepared by Krazan & Associates, Inc., a summary chronology of the site, and correspondence from the San Joaquin County San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD)provided to Kleinfelder by Wilbur-Ellis. In 1965, Wilbur-Ellis Company installed a 1,000-gallon underground gasoline storage tank (UST) at the site. In 1987, the UST and associated piping was removed. Low levels of total petroleum hydrocarbons as gasoline (TPH-G) were detected in soil samples collected at the time of removal. Affected soil was excavated and aerated. The former UST site was backfilled. In 1993, Wilbur-Ellis sold the property to H & H Engineering and Construction, Inc. In 1997, H & H applied for refinancing of a loan. No closure letter for the former UST was on file at the San Joaquin County PHS/EHD, and the bank required a subsurface assessment be conducted. H & H retained Krazan & Associates. A soil assessment conducted in February 1998 found low levels of TPH-G and BTEX compounds in the soil. Petroleum hydrocarbons were found in subsequent groundwater sampling conducted in March 1998. Additional soil and groundwater sampling, including the installation of three groundwater-monitoring wells, was conducted in 20-4439-OI.EOI/2000R3 l I Page I of 6 Copyright 2000 Kleinfelder,Inc. April 25,2000