SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Nov. 28, 2004 ATC Engineering submitted a response to Environmental Health Dept. and a petition for Closure was provided to State Water Resource Control Board for review of the site closure. January 7. 2005 Environmental Health Dept responded to ATC to the revised Closure report dated November 23, 2004. In summary, the Environmental Health Dept. remains concerned that the model produced by ATC Engineering is not sufficient to confidently predict future behavior of the plume of dissolved contaminants such as Environmental Health Dept can't concur with the closure recommendation. In the opinion of the Environmental Health Dept the model presented has several deficiencies January 7, 2005 State Water Resource Control Board responded they had received petition for case closure of underground storage tank site, 1766 Mt. Diablo requesting continue of any ongoing monitoring and reporting of site conditions while reviewing petition. January 25, 2005 Environmental Health Dept. letter to UST Program (CYA) comments on Petition For Closure of Underground Storage Tank site. An attempt to justify the process. February 16, 2005 Advanced Geological Inc. passed on a request by SWCB (Dennis Parafitt to submit a letter requesting Site Closure Appeal to be held in abeyance until such time additional information is available. Which will support the closure. February 17, 2005 California Regional Control Board Appeal denied Response that a significant contaminant mass and concentration remain at the site and that a no further action required letter should not be issued at this time. The responsible party has not adequately demonstrated that the plume will remain stable after sation of active remediation by groundwater pump and treatment, that contaminant mass is reducing as the result of natural attenuation, nor properly projected when water quality objectives will be met. February 18, 2005 the ATC Engineering firm prepared a revised request for Closure Report sent to Dennis Parafitt State Water Resource Control Board. March 6, 2005 State Water Resource Control Board letter of support requesting a work plan to evaluate plume response under natural conditions without the benefit of active engineered remediation. The work plan should also include such additional assessment measures necessary to formulate reasonable updated contaminant mass estimates. On March 17, 2005 Advanced Geological Engineering prepared a work plan to Environmental Health Dept. to assess the mass of remaining contaminants in ground water without the operation of the ground water extraction network.