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CHRONOLOGY <br /> 2421 Holly Dr., Tracy page 2 <br /> 10/25/96 Report of monitoring well installations and first groundwater sampling <br /> event received at PHS-EHD. Soil for B-1 @ 5' bgs, and MW-1, 2, and 3 <br /> at 5' or 10' non-detect at LUFT detection limits. MtBE (8020) non detect <br /> @ 5.0 mg/kg. Groundwater highest TPHg in MW-3 @3,500 pg/i and <br /> highest Benzene in MW-2 @ 11.0 µg/l. MtBE in MW-2 @ 16 µg11 per EPA <br /> Method 8020. Soil boring B-1 with grab groundwater sample reports <br /> TPHg @ 9,100 pg/l, and highest MtBE @ 66.0 µg/l. <br /> 04/04/97 Letter of Commitment for $25K issued by SWRCB-CUF. Claim #011461. <br /> 09/30/97 PHS-EHD issues requirement for work plan to delineate the groundwater <br /> plume contamination by October 31, 1997. <br /> 11/04/97 PHS-EHD approves AGE work plan received October 31, 1997 for deep <br /> soil boring in former UST pit to --20' bgs and additional monitoring well <br /> north of building. <br /> 04/19/99 With no enactment of approved work plan from 11197, PHS-EHD <br /> comments on AGE's, "Closure Summary Report", submitted to PHS-EHD <br /> on 4-6-99. PHS-EHD lists discrepancies with Closure Report and brings <br /> other concerns to the attention of the responsible party, including <br /> concerns for piping disposition, "strong HC odors" in samples NOT <br /> analyzed, and lack of quarterly monitoring. Closure request NOT <br /> approved. <br /> 01/24/00 PHS-EHD again comments on previous concerns NOT answered or <br /> enacted by responsible party. PHS-EHD issues directive to provide UST <br /> piping disposition records, resume quarterly groundwater monitoring, and <br /> to make application for drilling and enacting the approved May 1996 by <br /> March 10, 2000. <br /> 03/22/00 Monitoring well installation and additional boring NOT drilled yet. Instead <br /> new consulting firm ATC calls and requests delay for quarterly sampling <br /> for March 29, 2000. PHS-EHD allows extra time for catch up. <br /> 04/06/01 PHS-EHD and ATC establish possible next phases for site and include <br /> enacting work plan, submit PAR or NFA based on Tri-Regional Guideline <br /> Appendix A & B formatting by May 7, 2001 or new work plan by June 10, <br /> 2001. <br />