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�i <br /> McClelland consultants <br /> May 3, 1990 <br /> Project No. 0901-1640 <br /> (Task 003) <br /> Ogden Environmental Services <br /> 10955 John Jay Hopkins Drive <br /> San Diego, CA 92121 <br /> Attention: William S. Rickman <br /> Groundwater Monitoring Plan <br /> Contaminated Soil Stockpile <br /> Stockton Soil Treatment Facility <br /> Introduction <br /> Per your request, we have prepared a groundwater monitoring plan for the <br /> Stockton Soil Treatment facility. Ogden Environmental Services is undergoing <br /> permitting processes to establish a permanent treatment facility at the Stockton <br /> site. This groundwater monitoring plan has been prepared to meet the <br /> requirements set forth in the California Administrative Code (C.A.C.) Title 23, <br /> Subchapter 15 relative to water quality monitoring for classified waste <br /> management units. <br /> Project Background <br /> The existing contaminated stockpile at the site was constructed in October <br /> 1988, as part of the former Tillie Lewis Foods Cannery Site Remediation. Soil <br /> borings completed in the vicinity of the stockpile indicate that the subsurface <br /> soils consist of firm to stiff silty clays with layers of loose to medium dense <br /> silty sands. Groundwater was first encountered at a depth of about 10 feet below <br /> ground surface. Groundwater levels measured in site monitoring wells on four <br /> separate occasions over a one year period (March 1987 to March 1988) yielded a <br /> groundwater flow direction ranging from north to east-northeast. <br /> The stockpile has previously contained soil contaminated with #6 fuel oil <br /> from the former Tillie Lewis site remediation project. The Stockton Soils <br /> Treatement facility proposes to accept and treat hydrocarbon contamination that <br /> is not included on the federal, EPA RCRA list of hazardous wastes and, addi- <br /> tionally, is not a listed waste. <br /> Proposed Monitoring Plan <br /> The proposed groundwater monitoring program will consist of installing two <br /> downgradient and one upgradient monitoring wells, collecting soil samples during <br /> o urs Lash^an Amn ur b ue.Cai/ ,. �yl; <br /> X80'.n 644 8535 FAX 5011 Fs? <br /> A member of the Fugro-McClelland group of companies <br /> 1640A/B-1 <br />