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IM-1 KLEINFELDER ATTACHMENT A SCOPE OF WORK TEMPORARY GROUNDWATER MONITORING WELL INSTALLATION AND SAMPLING MARCH LANE UNDERCROSSING AT UNION PACIFIC RAILROAD STOCKTON, CALIFORNIA I& INTRODUCTION Kleinfelder is pleased to present this proposal to HDR Engineering, Inc. This proposal was developed after correspondence with Mr. Conrad Bridges of HDR Engineering, Inc., and Mr. Ray Deyto with the City of Stockton, using Kleinfelder's current understanding of the site conditions, and is a preliminary understanding of the City of Stockton's desires and requirements. We have prepared this proposal based on information usually requested in a workplan by the San Joaquin County Public Health Services Department, Environmental Health Division (PHS/EHD). The intent is that this document (less the contract and work requisition) can be submitted as a workplan to PHS/EHD. Kleinfelder is committed to providing a high level of service to its clients, commensurate with their wants and needs. If a portion of this proposal does not meet the needs of the client, or if those needs have changed, Kleinfelder stands ready to 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 the client, as well as adjustments to our fees. We look forward to the opportunity to serve you. 2.0 BACKGROUND Kleinfelder conducted a Phase I Preliminary Environmental Site Assessment (ESA) and Limited Phase II Assessment of the property identified as the future grade separations on March Lane at the Union Pacific Railroad (UPRR) and the Southern Pacific Railroad (SPRR) crossings in Stockton, California. The ESA was completed in accordance with the scope and limitations of our proposal (20-3712-08 dated April 10, 1996) and ASTM Practice E1527-94. One of the items of concern was as follows. Two of the six Cortese listed facilities and a PHS/EHD listed facility that all occupied the same location (BP #11190, Mobile Service Station, and Tosco Northwest Company No. 11190, all located near the UPRR site) have the potential to have an adverse impact on the UPRR site soil and groundwater. It is unknown if releases from these facilities have had an impact on groundwater. In addition, the vertical and lateral extent of soil contamination is unknown. Although the contamination may exist beneath the subject property, it is unlikely that it would encounter the actual work zone. The remaining four Cortese facilities, a Lust facility, and a Cal- Sites facility (Nor Mac, Inc., Fire Station #11, St. Mary's High School, Arnaiz 20-3712-08.EO1/2018P098 Page I of © 1998 Kleinfelder, Inc. April 8, 1998