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KLEINFELDER <br /> ATTACHMENT A <br /> SCOPE OF WORK <br /> Proposal <br /> Limited Soil and Groundwater Assessment <br /> SJRTD Site "O" <br /> Southeast Corner of N. Sutter <br /> And E. Channel Street <br /> Stockton, California <br /> INTRODUCTION <br /> Kleinfelder is pleased to provide this proposal to San Joaquin Regional Transit District (SJRTD). <br /> This proposal was developed after discussion with Mr. Wendell Krell of SJRTD and is a <br /> preliminary understanding of SJRTD's desires. This proposal was based on information usually <br /> requested in a workplan by the San Joaquin County Public Health Services Department <br /> Environmental Health Division (PHS/EHD) and the Central Valley Office of the State of <br /> California Regional Water Quality Control Board (CVRWQCB). <br /> Kleinfelder is committed to providing quality service to its clients, commensurate with their <br /> wants, needs and desired level of risk. If a portion of this proposal does not meet the needs of <br /> the SJRTD, or if those needs have changed, Kleinfelder will consider appropriate modifications, <br /> subject to the standards of care to which we adhere as professionals. Modifications such as <br /> changes in scope, methodology, scheduling, and contract terms may result in changes to the risks <br /> assumed by the SJRTD as well as adjustments to our fees. <br /> BACKGROUND <br /> Kleinfelder has performed limited soil sampling and excavation observation of a former redwood <br /> tank area at the site. Approximately 750 cubic yards of extractable petroleum hydrocarbon- <br /> impacted soil was removed from the tank area and transported to Forward Landfill in Stockton, <br /> California. Confirmation soil sampling indicated that contamination remained at the site. The <br /> highest total recoverable petroleum hydrocarbon (TRPH) concentration from a sidewall <br /> confirmation sample was 6200 mg/kg. A confirmation bottom sample collected a depth of 20 <br /> feet had a TRPH concentration of 190 mg/kg. Volatile organic compounds by EPA Method <br /> 8260B, (including oxygenates), total petroleum hydrocarbons as referenced to gasoline, diesel <br /> and motor (TPH-G, TPH-D, TPH-MO) and PCBs were not detected from three soil samples <br /> collected in the tank area exhibiting the highest TRPH concentrations. Five LUFT metals were <br /> also analyzed with unremarkable results from eight of a total of 11 confirmation soil samples. <br /> Depth to groundwater is estimated at 35 feet below ground surface (bgs). PHS/EHD <br /> recommended additional work to evaluated the lateral and vertical extent of the contaminants <br /> and to evaluate impact to first encountered groundwater. This proposal addresses this <br /> recommendation. <br /> 02002PROP.ENV/ST05PI74/DH:Iv Page A-1 <br /> 0 2005 Kleinfelder,Inc. May 16,2005 <br />