SITE INFORMATION AND CORRESPONDENCE_FILE 2

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January 22. 1997 performed a review of work accomplished and account reconciliation related to the soil and groundwater remediation performed at 1766 Mt. Diablo by the firm of Lush Associates. Action taken to terminate the firm of Lush Geosciences, and file a formal complaint to remove his license. February 24, 1997 Received pre-approval of Corrective Action Plan #557 under signature of Ismanuel Jacobs with Resources Control Engineer U.S.T Cleanup Fund. March 19, 1997 Chapin Bros received the delivery from the U.S.T. FUND used equipment King Buck Catalytic and oxidation system (soil vapor extraction system). This equipment was not complete, parts missing etc. causing many hours of non- operational time and expense. March 28, 1997 In accordance with my request Advanced Geological Engineering conducted a review of the soil vapor extraction (SVE) network. On location the air sparging (IAS) network was installed at this site the review was conducted to determine if a need for additional wells and networking was expected also including the soil beneath the building. March 28, 1997 we continued to receive delinquent notices from the office of San Joaquin Public Health Services. These charges were to be reversed in 1992. Only one tank fee was reversed leaving a balance of $978.26. Many attempts to correct this over-billing failed. I referred this matter to Sen. Patrick Johnson, and Mr. Rick Aguilera assistant to supervisor Gutierrez. Both parties referred this complaint to Terry Dermody, S.J. County Counsel. Results-the County stopped billing April 1997 Operation of the Vapor Extraction commenced at 1766 Mt. Diablo Ave. In 1997 an in site Air-Sparging (IAS) system was initiated in March of 1997 and was operated in conjunction with the SVC system until June 1999 October 28"' 1997. Advanced Geological Engineering provided a status update on the Soil Vapor Extraction/Air Sparging Operation noting repairs to the King Buck service and maintenance defects, the fragilities of the Soil Vapor Extraction unit have increased support time required although the system through October 1997 operated with less than twelve (12) hours of non-operational time. A total of 546 lbs. or 87 gallons of hydrocarbons as gasoline were removed by the soil evaporation unit. Also noting the rise in ground water table at this site. Has reduced the effectiveness of the soil vapor extraction system. Noting further that the unit has currently not operated with a stable status. December 27, 1997 Tank Fund provided Pre-Approval for Soil Vapor Extraction upgrade. r.