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ting - <br /> . , SEP ^88 <br /> fNVIRONMENTAL HEALTH GEORGE DEUKMEPAN. Go- <br /> STATE OF CALIFORNIA-HEALTH AND WELFARE AGENCYVICES <br /> _ <br /> DEPARTMENT OF HEALTH SERVICES - <br /> TOXIC SUBSTANCES CONTROL DIVISION <br /> NORTHERN CALI FORMA SECTION <br /> 4250 POWER INN ROAD <br /> SACRAMENTO,CA 95826 <br /> (915)739-3145 <br /> September 15, 1988 <br /> Mr. Brian Foucht, Principal Planner <br /> City of Tracy <br /> 325 East 10th Street <br /> Tracy, CA 95376 <br /> Dear Mr. Foucht: <br /> CONTAMINATED PROPERTY LOCATED ADJ CENT TO AND SOUTH OF BYRON ' <br /> ROAD, WEST OF CORRAL HOLLOW ROAD (APN: 237-170--19 , SUNBORO <br /> . DEVELOPMENT .-CORPORATI.ON) <br /> The California Department of Health Services (Department) has <br /> reviewed the information you provi ed in regard to sampling the <br /> above noted property to determine the extent of hydrocarbon <br /> contamination present in subsurface sails. <br /> The proposal made by Sunboro Devel pment Corporation to the City <br /> of Tracy consists of drilling a li ear series of eight (8) soil <br /> borings, - and the collection and analysis of soil samples, to <br /> establish a "clean line" between the two legal parcels owned by <br /> Sunboro. The information provided to the Department indicates <br /> that contamination has been discovered beneath Byron Road and <br /> that portions of Sunboro' s Parce B near Byron Road may be <br /> contaminated. <br /> The purpose of establishing a "clean line" on Parcel B would be <br /> to allow for development of Sunbor ' s Parcel A. which is located <br /> adjacent to and south of Parcel B. <br /> While we do not object -to the proposed sampling, .the Department <br /> does not feel that this approach is the most prudent or effective <br /> x -method-of_deter-mining, -the---presence, of absence-.or- contain-ina-rion•-on-- - -- <br /> the Parcel A property. As an alternative, the Department <br /> suggests the first step to addressing the problem should be to <br /> identify potential sources from where the current contamination <br /> may have originated, and to define the subsurface geology at the <br /> site. The second step would be to design a sampling plan to <br /> characterize the extent (both vertical and horizontal) of the <br /> contamination. <br /> The identification of the contaminant source and subsurface <br /> geology is of utmost importance for the following reasons: <br /> o If the contaminant source is actively discharging, the <br /> extent of the contamination is likely to spread over time. <br /> The contaminant source ndeds tc be removed. <br />