SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

1 2905 Benjamin Holt Page 2 PHS/EHD has also evaluated the information which you provided regarding the City of Stockton's Municipal Well #10.located within the groundwater contamination plume's boundaries. PHS/EHD is unsure with which employees you have spoken iregarding the well's designated use. The City of Stockton's Deputy Director of the Municipal Utilities has stated that the well's purpose is to provide a domestic water supply. As you know the last time that this well was tested for petroleum hydrocarbon contamination was in March 1992;by Chevron and March 1991 by the City of Stockton. Also, you should be aware that there are no mandated requirements for large public drinking water systems to test for methyl-tertiary-butyl ether (MTBE); testing is voluntary at this point. Given the evidence of a MTBE soil release from the Chevron site and groundwater sample results, MTBE analysis should be included in Chevron's sampling plan of this well. To begin evaluation of the potential impact that Chevron's activities have had on Municipal Wells #2 and #10, quarterly sampling of these wells with analysis for gasoline constituents including MTBE and other additives, should be initiated immediately. Regarding your reference to the clean-up goals proposed in the August 31, 1995 Geraghty and Miller report, PHS/EHD has stated numerous times, clean-up goals that are proposed must be in accordance with the Central Valley Regional Water Quality Control Board Basin Plan. If you have any questions, please do not hesitate to contact me at (209) 468-0337. Donna Heran, REHS, Director Environmental Health Division Mary Meays, Senior REHS Margardi'Lagorio, REH Site Mitigation Unit Supervisor MM/2905BENHO cc: Elizabeth Thayer, CVRWQCB cc: David Irey, San Joaquin County Deputy District Attorney cc: Kent O'Brien, Geraghty and Miller. I 1