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STATE OF CALIFORNIA—ENVIRONMENTAL PROTECTION AGENCY PETE WILSON Governor D&AkTMENT OF TOXIC SUBSTANCES CONTROL 4'u0 P Street,4th Floor to P.O. Box 806 Sacramento, CA 95812-0806 (916) 323-2916 R EC P6 `a May 17 , 1993 MAY 2 5 1993 Mr. W. Dave Olmstead ENVIRONMENTAL HEALTH W. D. O. , Inc. 7599 Linne Road, Suite #1 Tracy, California 95376 MANCUSO ESTATES PROJECT (FAIROAKS AND BATES ROADS, TRACY) BORDER ZONE PROPERTY DETERMINATION REQUEST NUMBER 93-05 De--i. Mr. Olmstead: This letter is in response to your letter of April 5, 1993 requesting a border zone determ.;nation for property located at the southeast corner of Fairoaks and Bates Roads (Assessor's Parcel Numbers 248-090-06/07) in Tracy, San Joaquin County. This property, approximately 35 acres, is proposed for residential development known as Mancuso Estates. The subject property is located within 2 , 000 feet of the Defense Distribution Region West Tracy (DDRW-Tracy) , formerly known as the Tracy Defense Depot. We have consulted with the Site Mitigation Branch of our Region 1 office regarding the DDRW-Tracy site. The site is listed on the Federal National Priorities List and is currently being investigated for soil and groundwater contamination under the direction of the Department of Toxic Substances Control (Department) . The Department is pursuing a Record of Decision (ROD) to remediate the groundwater contamination emanating from the DDRW-Tracy. The ROD should be finalized by August, 1993 . An interim groundwater extraction and treatment system was installed in May of 1991 to control offsite migration of trichloroethene (TCE) and perchlorothylene (PCE) contamination in the groundwater. The next phase of the Remediation Investigation will focus on the evaluation of the solid waste management units. Decision The DDRW-Tracy site is fenced and most of the site is paved. The direction of the groundwater flow is north to northeast, which is away from the Mancuso Estates Project. The additional information you submitted April 26, 1993 indicates that the water services for the project will be provided by the County Service Area 44 . Therefore, based on our review of the available information and provided that the project utilizes the water services from the County Service Area or the City of Tracy, we find that there will be no significant health threat to future residents of the proposed development resulting from the project's proximity to DDRW-Tracy at this time.