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2-25-1997 10:45AM FROM HORIZON/ELDORADO 916 939 2172 F'. 2 <br /> HORIZON ENVIRONMENTAL INC. <br /> s Specldish In Site Assessment,Remedial Testing,Design and Operation <br /> February 6, 1997 <br /> Ms.Michelle Nokes,Vice President J'P46 <br /> Winner Ford <br /> 1650 Park Street <br /> Alameda,California 94501 Fr <br /> Subject: Change Order Request <br /> Discovery Chevrolet, 1615 West 11th Street,Tracy,California <br /> UST Reimbursement Fund Claim No.008529 <br /> Ms.Nokes: <br /> As requested Horizon Environmental Inc. (Horizon) is forwarding this change order for the <br /> cost of the work to be performed at the above-referenced site. This change order is <br /> necessary as request by the San Joaquin Public Health Services (SJPHS) request for <br /> submitting a revised Workplan and workscope. Previously budgeted work at the site <br /> included excavating the former UST cavity and installing additional monitoring welts. <br /> SJPHS has indicated that due to declining trends in hydrocarbons the overexcavation may <br /> not be required and have requested a revised Workplan and workscope to completely assess <br /> the site and evaluate natural attenuation as a remedial alternative. In our opinion this <br /> workscope can assess the site and evaluate utilizing natural attenuation as a remedial <br /> alternative. <br /> This scope of work includes; <br /> • Preparing a revised work plan with a site specific site safety plan. <br /> • Obtaining all the necessary permits for the proposed work. <br /> • Collecting soil samples utilizing a hand-auger in the area in and around the former <br /> gasoline-UST area to delineate gasoline range hydrocarbons in soil in this area. We <br /> estimate that a minimum of 4 soil borings to 10 feet will he required to access this area. <br /> The goal is to delineate the lateral extent of hydrocarbons in this area. Samples should <br /> be collected at 5 feet and approximately 1 foot above groundwater. <br /> • Install two additional monitoring wells downgradient of the former UST cavity and <br /> collect groundwater samples. <br /> • Submit selected soil and groundwater samples to a state-certified laboratory for analyses. <br /> Samples collected from each sampling location will be analyzed TPHg and BTI (. <br /> Assume 8 soil samples and two groundwater samples will be analyzed- <br /> 6011 <br /> nalyzed5011 Golden Foothill Parkway,Suite 7.EI Dorado Hits,CA 95762•(9160 939-2170•FAX(916)939-2172 <br /> P.O.Box 5283 • Bakersfield.CA 93388 • (805)5B9-8389 9 FAX(815)SR9-lav, <br />