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i <br /> 1 Post-Closure Plan" . The Department responded to the Plan on <br /> 2 December 31 , 1987 . <br /> 3 ! 2 . 4 POPULATION AT RISK <br /> i <br /> 4 2 . 4 . 1 Potential exposure routes exist through air, direct <br /> 5I contact, surface water runoff, and groundwater use. The Site is <br /> 6i fenced with the South Yard bounded on the south side by single <br /> 7 family residential units. A high school borders the west side <br /> 8 of the North Yard. California Water Services' well #20 which is <br /> 9locate d approximately 1 mile south of the Site and supplies <br /> pp Y <br /> i <br /> 10 municipal water to the city of Stockton has shown levels of ' <br /> 11 chromium above drinking water standards as described in Section <br /> 12 2 . 5. 1 of this Order. It has not yet been determined whether the <br /> 13 chromium in well No. 20 is attributable to the Respondent's <br /> 14 operations. <br /> 15 2.5 HEALTH RISKS OF SUBSTANCES FOUND I <br /> 16 2 . 5. 1 The primary contaminant detected in the on-site and <br /> 17 off-site groundwater is chromium, including hexavalent chromium. <br /> 18 <br /> Levels found in groundwater beneath the Site during the phase I <br /> 19 study ranged from non-detectable to 550 milligrams per liter ' <br /> 20 <br /> (mg/1) . Exhibit 8 is an excerpt of the "Phase I Groundwater � <br /> 21 Assessment" report showing analytical results of samples drawn <br /> i <br /> 22 from wells #6 and #211. - <br /> 23 2 . 5.2 On July 7, 1987 California Water Services' well #20 was <br /> 24 sampled by representatives of the Respondent. Analytical <br /> 25 results of the sample indicated the current federal drinking <br /> 26 water standard of 0.05 milligram per liter (mg/1) for chromium <br /> 27 had been exceeded. (The U.S. EPA has proposed that this <br /> -5- <br /> COURT PAKR <br /> @TATA OF GLt/OAMIA <br /> STI). 111 1011y. 8•721 <br /> 0 34M <br />