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r zG L STATE OF CALIFORNIA—HEALTH AND WELFARE AGENCY GEORGE DEUKMEJIAN, Governor DEPARTMENT OF HEALTH SERVICES 714/744 P STREET SACRAMENTO, CA 95814 NOV ,: , P (916) 445-7410 Ms. Kitty Walker San Joaquin County 1810 East Hazelton Stockton, CA 95205 Dear Ms. Walker: Planning Division Avenue Thank you for your letter regarding the proposed residential subdivision located in Lathrop, San Joaquin County (SU -88-14), which is within 2000 feet of three known hazardous waste sites. These sites are Air Products and Chemicals, Inc., J.R. Simplot Company, and Libbey-Owens-Ford Company. You have requested input from the Department on the scope of a hazardous waste investigation that would provide the necessary information to make a border zone determination. The Department understands that the County may require this type of investigation for processing and approval of the proposed project. You also provided us with the following documents for review: (1) Reconnaissance Environmental Assessment for Libbey-Owens-Ford Company, Lathrop, CA (September 4, 1987) Kleinfelder Associates; (2) Environmental Assessment for Approximately 600 Acres of Undeveloped Land Under Purchase Agreement from Libbey-Owens-Ford Company, Lathrop Facility (August 11, 1987) SRM Applied Environmental and; (3) Environmental Assessment for Libbey-Owens-Ford Company, Lathrop Facility (August 11, 1987) Woodward -Clyde Consultants. A border zone determination is an assessment of the potential health risk to residents who live within 2000 feet of a significant disposal of hazardous waste. In general, the scope of a health risk assessment should include an assessment of: (1) the toxic properties of hazardous substances disposed at the hazardous waste site; (2) existing or potential exposure pathways of hazardous substances from the site (i.e., air, water, soil);