SITE INFORMATION AND CORRESPONDENCE

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'�' BC&D PROPERTIES RECE11.1 350 Via Concha APR 0 9 193 Aptos, CA 95003 ENVIRONMENTAL HEALTH (408) 688-0483 PERMIT/SERVICES April 5, 19932 Linda Turkette, REHS San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, CA 95201 Reference: BC&D Properties Site Code 9024 Contractor #39000 Subject: Public Health Services Letter of February 8, 1993 Dear Linda: We have reviewed the subject letter and will address the items in light of all the previous site-specific data that has been generated and reported on this property since 1987 through the current period. We share your concerns regarding the City of Tracy's well number 5 and, in that regard, have been vitally concerned about any movement of the near surface groundwater, no matter how lightly contaminated. The site-specific local groundwater gradient bears southwesterly between the apparent limits of S 15° West to S 25° West, a 2.7% radial variance between 1987 and 1992. The gradient is directionally stable as measured at different intervening seasons of the year and falls consistently away from the Tracy well facility, located northerly of the site. We have on file a copy of the Tracy well's installation log confirming the well's construction and the intervening impervious clay layers between the well collar at the surface and the potable water stratum hundreds of feet below the existing ground surface. We are receiving annual copies of the Organic Chemical Analysis of Tracy well number 5 and confirm that non-detection for aLl organic elements of concern is being reported. Monitoring wells MW-1 and MW-3 lie in a plane between the former tank site and the Tracy well. Any movement of contaminated groundwater toward the Tracy well would be evident in these wells. The total absence of contaminants in MW-1 and MW-3 (as