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Chronology <br /> Ed's Muffler Shop/ Cox & Cox Brothers <br /> 595 E. 111h Street, Tracy CA 95376 <br /> San Joaquin County Local Oversight Program <br /> Geotracker ID#: T0607700373 Site #: 1933 <br /> Clean Up Fund#: 009444 E <br /> i <br /> 01/19/90 Five underground storage tanks (UST) were removed under EHD permit f <br /> and inspection on this date. Hydrocarbon odors and discolored soil were <br /> observed. <br /> 02/15/90 The date the Environmental Health Department (EHD) received the <br /> laboratory results of the soil and groundwater samples collected beneath <br /> the USTs when they were removed which verified the soil and ground <br /> water was contaminated by releases from the USTs. A Notification of y� <br /> Hazardous Waste Discharge and an Unauthorized Release Report were <br /> filed this date. <br /> 03/12/92 Three monitoring wells MW1, MW2, and MW3 were installed around the <br /> former UST area. <br /> 08/24/92 The date the EHD received EVAX Consultant's report, Site Investigation <br /> Report dated April 7, 1992, that discusses the March 1992 work and <br /> documents petroleum hydrocarbons in water samples from the three <br /> monitoring wells <br /> 10/6-7/93 The first quarterly ground water monitoring well sampling was conducted <br /> and hand auger borings SB1 thru SB9 were advanced to depths of 8 to <br /> 10.5 feet below grade on these dates. <br /> 12/09/93 The date the EHD received the Site Characterization Report dated <br /> November 8, 1993, that documents soil data from borings S81 thru S139, <br /> grab ground water results from SB2 and groundwater samples from the <br /> three monitoring wells. <br /> 05/23/96 Twelve soil borings (PB/1 thru PB/9, TPE, TPN, TPS) were installed on <br /> and offsite on this date. <br /> 07/29/96 The date of Wright Environmental's Additional Site Investigation/Problem <br /> Assessment Report that discusses the May 1996 work. Elevated <br /> i <br /> (I <br /> `i <br /> I <br />