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n <br /> CHRONOLOGY <br /> LAMMERSVILLE SCHOOL <br /> 16555 VON SOSTEN ROAD, TRACY <br /> 11/26/86 PHS/EHD received notification that a 550 gallon gas tank had <br /> been removed from the site. <br /> 12/15/86 PHS/EHD witnessed soil and grab water sampling from the tank <br /> excavation. <br /> 01/02/87 PHS/EHD received sample results confirming contamination. <br /> 03/19/87 A water sample was collected from the school drinking water well <br /> by Central Valley Regional Water Quality Control Board (lead <br /> agency). The well is upgradient and over 1000 feet away from the <br /> tank area. <br /> 03/23/87 PHS/EHD instructed the responsible party to hire a consultant. <br /> 06/19/87 Five monitoring wells were installed. <br /> 6/87-9188 Monitoring wells were sampled 3 times. Confirmed groundwater <br /> contamination in MW1 and MW2 which are downgradient of the <br /> tank pit. <br /> 02/06/89 A work plan for 3 additional monitoring wells was submitted. <br /> 03/23/89 A 2000 gallon diesel tank was removed. Petroleum odor and soil <br /> discoloration was observed by the PHS/EHD inspector. Soil I <br /> samples were collected. <br /> 04/12/89 PHS/EHD received the soil sample results from the 2000 gallon <br /> tank removal. No contaminatiori was detected. <br /> 08/15/89 Site was placed in the Local Oversight Program with PHS/EHD <br /> becoming the lead agency. <br /> 06/19/90 Monitoring wells 6,7and 8 were installed. <br /> 6190-8191 Monitoring wells 1 - 8 were sampled 5 times. MW6 which is <br /> downgradient of MW1 and MW2 and the tank pit, had the highest <br /> levels of groundwater contamination. MW1 and MW2 <br /> contamination levels were lower so it was suspected that the <br /> plume was moving. <br />