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ERM-West, Inc. <br /> Suite 200•2001 P Street•Sacramento, California 95814-5213•(916)444-WEST(444-9378) •Telefax(916)444-5313 <br /> April 29, 1991 <br /> Mr. Harlin Knoll f7v <br /> Environmental Health Specialist la <br /> Public Health Services APR 3 0 171 <br /> San Joaquin Countyt��/lRQNME��iTL. !`lcd;LTiri <br /> P.O. Box 2009 �ERMfT/ui:.=;'�i�:�;; <br /> 1601 E. Hazelton Avenue <br /> Stockton, CA 95201 <br /> Subject: Addendum to the Investigation Workplan for the Site <br /> Located at 1033 East Scotts Avenue, Stockton <br /> Dear Mr. Knoll: <br /> We have prepared an addendum to the Workplan previously submitted on <br /> August 31, 1990 as Section 2 of the Preliminary Report of the Soil <br /> Investigation of Former Underground Storage Tank Sites at 1033 East Scotts <br /> Avenue in Stockton. The purpose of this addendum is to propose additional <br /> work at the site which will help determine the full extent of the affected soil, <br /> and facilitate the generation of cost estimates for various remedial <br /> alternatives. Specifically, this additional work is proposed to (1) better <br /> estimate the total volume of contaminated soil in the ground as well as the <br /> excavation requirements should remediation of the site entail removal of <br /> the soil, and (2) determine whether or not the soil is a hazardous waste. <br /> The scope of work will include: <br /> • Installation of 3 borings to estimated depths of 45 feet, 25 feet <br /> and 25 feet, to refine the estimate of the lateral and vertical <br /> extent of the product occurrence identified in August 1989• <br /> • Collection and analysis of a total of 4 soil samples for Total <br /> Petroleum Hydrocarbons by EPA Method 8015 (modified); <br /> • Analysis of one soil sample with the highest concentration of <br /> TPH for Benzene, Toluene, Xylenes, and Ethylbenzene (BTXE), <br /> and for bioassay using fathead minnows in order to determine <br /> if the soil is a hazardous waster, <br /> r In a telephone conversation with Diana Peebler from the California Department of <br /> Health Services on March 22, 1991,Ms. Peebler stated that a fish bioassay would be <br /> adequate for determining whether the affected soil is hazardous. There is no reason to <br /> believe that the product in the soil contains metals or that it is combustible. Therefore, no <br /> analyses are required for metals or flash point for the affected soil at this site. <br /> TM <br /> An affiliate of The Environ A I Resources Management Group with offices worldwide W-ii <br />