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EMCON/OWT, Inc <br /> 1326 North Market Boulevard <br /> � RONMENT AE HEAL111 Sacramento CA 95834 <br /> 916 928 3300 <br /> # - Fax 916 565 4356 <br /> S�1 W` EMCON/OWT, Inc. N0� i Z Ar �' 2! <br /> 1 <br />' November 8, 2002 <br /> Project No 880-0401A <br /> Ms Margaret Lagono' � �v Gov <br /> San Joaquin County Public Health Services I <br /> Environmental Health Division f � y 0� �,A 0� <br /> 304 East Weber Avenue <br /> Stockton, California 95202 1� <br /> tRe Additional Assessment and Interim Remediation Report <br /> Parkinson's Hammer 1-5 Arco <br /> 3250 West Hammer Lane <br /> Stockton, California <br /> ' Dear Ms Lagorio <br /> On behalf of Mr Jim Parkinson of Parkinson's Hammer 1-5 Arco, Shaw Environmental <br /> ' and Infrastructure (Shaw E & I), formerly IT Corporation, presents this Additional <br /> Assessment and Interim Remediation Report discussing the results of a 5-day dual phase <br /> ' extraction (DPE) remediation event and the installation of two downgradient wells and <br /> one deep soil boring The purpose of the DPE event was to reduce the concentrations of <br /> ' methyl tertiary butyl ether (MtBE) in soil and groundwater beneath the site and to <br /> evaluate the feasibility of implementing groundwater extraction, vapor extraction, or <br /> ' DPE as a remedial solution This work was conducted in response to a letter from the <br /> San Joaquin County Environmental Health Department (SJCEHD) dated <br /> October 31, 2001, requesting definition of the vertical and lateral extent of soil and <br /> groundwater impact and an interim remedial alternative to control the off-site migration <br /> of MtBE <br /> N\rancfpllPropctslProjects188010401la10110L4ssessmentand Interim Remedial ReporLdoc A Shaw Group Company <br />