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R■ KLEINFELDER ATTACHMENT A SCOPE OF WORK Revised Proposal/Workplan Monitoring Well Installation Former Underground Storage Tank Site Lopez Property 1601 Turnpike Stockton, California INTRODUCTION Kleinfelder is pleased to present this revised proposal/workplan to Ms. Kathy L. Monday,Esq. of Darrell, Nelson, Schrimp, Pallios, Pacher & Silva. This proposal/workplan was developed based upon our current understanding of site conditions and correspondence. Kleinfelder is committed to providing quality service to our clients, commensurate with their wants, needs and desired level of risk. If a portion of this proposal/workplan does not meet your needs, 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 may result in changes to the risks assumed by you our client as well as adjustments to our fees. BACKGROUND Kleinfelder was contacted to present a cost estimate to assess the subsurface soils located at 1601 Turnpike Road, Stockton California. The subject property had previously been owned or operated by Harbor Signs. According to an EHD inspection report filed October 16, 1987 a 1,000-gallon leaded fuel underground storage tank (UST) was removed on October 14, 1987 under San Joaquin County Health Department permit and inspection. The tank appeared intact, and soil samples were not collected until October 16, 1987 due to equipment inadequacies. The soil at 15 feet reportedly had a strong petroleum product odor. The soil samples collected beneath the tank were analyzed and had non-detect levels of petroleum constituents (BTEX, ethyldibromide, TPH-G, TPH-D, TPH-K, and TPH-MO), total lead was detected at 5.5 mg/kg. The soil beneath the UST was resampled on June 20, 1996, to confirm the results previously obtained. One sample was obtained at a depth of 16 feet below ground surface (bgs). The soil was sampled for TPH-G, BTEX, and MTBE. The sampled contained non-detect values of all constituents. Based upon review of the QA/QC data accompanying the analytical reports, EHD determined that additional investigation was necessary. �✓a . Vy" S/24/0 Due to a property transfer agreement three soil probe borings were advanced at the site on August 20, 2003 in the location of the former tank pit(B-1), a used oil holding tank (B-2), and an "area of concern �,�3 " The soil at B-1 betw,�en. an� Weet bgs consisted of dark brown to orange brown;moist tobsaa ated clayey silt�'G'rou 16kater wit's encountered at approximately 25 to 30 feet with recharge up to 15.5 feet bgs. TPH-G and BTEX compounds were detected at maximum concentrations of 10,600 ppym, 13 ppm, 330 ppm, 180 ppm, and 650 ppm, for TPH-G, >1,W 02001PROP.ENV/ST04P347/KS:ss Page 1 of 8 Copyright 2004,Kleinfelder,Inc. August 16,2004