SITE INFORMATION AND CORRESPONDENCE

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Chronology page 2 2315 N. California Street, Stockton i 11107/1997 Date of the EHD letter commenting on Foothill's work plan. The EHD i required all three monitoring wells to be installed and limited the well screen length to twenty feet at most. Later work plan revision modified MW-2, MW-3, and MW4 to dual casing, nested wells. I 05/27/1998 Date monitoring wells MW-2s/d, M -3s/d, and MW-4s/d were installed. 10/21/1998 Date of Foothill's Report of Findings of Phase 2 Site Investigation that details the installation of three dual cased, nested monitoring wells. 04/27/2001 Date of Foothill's work plan Expansion of Phase 2 Investigation to the East which proposed the installation of one off-site, dual-cased monitoring well, MW-5a and MW-51). 11/08/2001 Date monitoring well MW-5a anc MW-5b were installed. Details in Foothill's Report of Findings M415sld Installation, dated 1-2-2002. Monitoring well MW-5a later changed to MW-5S (shallow) and monitoring well MW-5b changed to MW-51D (deep). 02/23/2005 Date of Foothill's Site Conceptual Afodel (SCM). 04/13/2005 Date of the EHD letter commenting on SCM that required newly discovered domestic well on-site to be destroyed and MW-1 to be destroyed and replaced so as not to provide a vertical pathway across two water bearing zones. The EHD denies a request to grant a No Further Action status to the site since the 1,2-DCA plume is not fully characterized and requires a work plan to continue the investigation. 06/10/05 On-site `domestic' well destroyed under witness and permit issued by the EHD. 07/19/05 Meeting held with the responsible party and consultant at the EHD at the request of consultant. Concerns included costs, 1,2 DCA and PCE investigation, and if from UST, and CUF reimbursement. 09/16/05 Date of EHD work plan comment and approval letter for CPT -1, -2, & -3 installations sent. 10/17/05 Date of EHD letter commenting and denying Foothill's October 5, 2005 Work Plan for MW-1S, MW-9D, MW-6S and MW-6D installations and MW-1 destruction as inadequate. Addendum needed. 10/21/2005 Date Cone Penetrometer Test (CP ) borings CPT-1 & 2 were installed. 11/08/05 Date of EHD approval of Foothill's Work Plan for MW-9S and D, and MW-6S and D (addendum) dated October 29, 2005, for monitoring well installations and existing monitoring well MW-1 destruction.