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CHRONOLOGY <br /> POMBO RANCH PROPERTY <br /> 24100 LAMMERS ROAD, Tracy <br /> 09/16/98 Phase 11 Environmental Assessmen conducted this date, 8 soil borings <br /> (B1 — B8) advanced for the collectio ri of soil and grab groundwater <br /> samples near the location of a former farm exempt underground storage <br /> tank (UST). <br /> 10/05/98 Date of Report of 9116198 work. Pet oleum hydrocarbon contamination <br /> in the soil and groundwater near the former UST. <br /> 11/06/98 Unauthorized Release Report#98-U42 and Prop 65#98-163 filed. <br /> 11/18/98 Notice of Responsibility and site letter sent to responsible party, Ernest <br /> J. Pombo. Site placed into Local Oversight Program. <br /> 12/08/98 SJCIEHD letter sent this date to responsible party directing submittal of <br /> a work plan to begin the site investigation. <br /> i <br /> 04/20/99 Received work plan for beginning site investigation this date. Dual phase <br /> plan, geoprobe soil borings followed by monitoring well installations. <br /> 05/17/99 Work plan approved by SJCIEHD. <br /> 07/06/99 Site investigation began this date; advancement of 4 more geoprobe soil <br /> borings (B9— B12)for the collection of soil and grab groundwater sample. <br /> 7116199 Analytical results from geoprobe samples submitted to SJCIEHD with a <br /> map of proposed monitoring well locations. <br /> 07/20/99 Three groundwater monitoring wells (MW1 —MW3) installed this date. <br /> 09/10/99 Date of report on July 1999 work. <br /> 11/22/99 Date of SJCIEHD letter directing the submittal of a Corrective Action Plan <br /> (CAP) including a feasibility study and calculations of contaminant mass. <br /> 04/07/00 Corrective Action Plan submitted this date. Several items needed to be <br /> clarified concerning the calculations of contaminant mass. <br /> 05/15/00 Additional information requested for AP submitted by consultant. <br /> 10/30/00 SJCIEHD requested review of CAP by Regional Board staff. <br /> 12/28/00 Date of Regional Board letter on CAR <br /> I <br /> 01/18/01 Date of SJC/EHD letter on CAP. Regional Board comments were <br /> incorporated into the response. Work plan for additional investigation <br /> to be submitted by 03105/01. <br /> 07/16/01 Date of SJCIEHD enforcement letter giving the responsible party <br /> 14 days to submit the overdue work plan. <br />