SITE INFORMATION AND CORRESPONDENCE

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Corporate Offices 41674 Christy Street, Fremont, CA 94538-3114 (415) 659-0404 , Fax: (415) 651-4677 Contr. Lic. No. 550205 August 31, 1989 San Joaquin Local Health District Environmental Health Division P.O. Box 2009 Stockton, CA 95201 Attention: Ms. Cynthia Wagner Subject: Addendum to Proposed Work Plan Roberts Petroleum Services Facility 930 Victor Road, Lodi, California EES Project No. 1628G Dear Ms. Wagner: ♦♦ ensco ♦♦♦♦ environmental ♦ services, inc. a subsidiary of environmental system company At your request, Ensco Environmental Services, Inc. (EES) is submitting this addendum to our letter dated April 26, 1989 for additional work at the Roberts Petroleum Services Facility in Lodi, California. Our letter requested approval for permits for the installation of a groundwater recovery well for removing free -phase petroleum hydrocarbons and drilling additional exploratory borings. Your office requested the following information prior to issuing permits: 1 . Site plot plan on 8-1/2 by 11 inch sheet 2. Description of well construction 3. Plan for disposal of soil and groundwater 4. Groundwater gradient at the subject site The attached figure shows the locations of the proposed recovery well and exploratory borings. When the boring for the well is drilled to its termination depth, 2 inch diameter, Schedule 40 PVC blank and factory slotted casing with flush -threaded couplings will be set through the 8 -inch outside diameter augers. Clean sand will be used to fill the annular space to a level that is approximately 2 feet above the screened interval. A bentonite seal will be set upon the sand and cement grout, placed using a tremie pipe, will be used to seal the remainder of the annular space. The exploratory borings will be backfilled with cement grout placed through the augers using a tremie pipe. Drill cuttings generated from the drilling will be placed on plastic sheeting and covered. Groundwater removed from the well will be drummed. Both will be left at the site pending the results of the laboratory analyses. It will be the responsibility of Roberts Petroleum to properly dispose of any contaminated soil or groundwater. -o So LT. Ile sy At your request, Ensco Environmental Services, Inc. (EES) is submitting this addendum to our letter dated April 26, 1989 for additional work at the Roberts Petroleum Services Facility in Lodi, California. Our letter requested approval for permits for the installation of a groundwater recovery well for removing free -phase petroleum hydrocarbons and drilling additional exploratory borings. Your office requested the following information prior to issuing permits: 1 . Site plot plan on 8-1/2 by 11 inch sheet 2. Description of well construction 3. Plan for disposal of soil and groundwater 4. Groundwater gradient at the subject site The attached figure shows the locations of the proposed recovery well and exploratory borings. When the boring for the well is drilled to its termination depth, 2 inch diameter, Schedule 40 PVC blank and factory slotted casing with flush -threaded couplings will be set through the 8 -inch outside diameter augers. Clean sand will be used to fill the annular space to a level that is approximately 2 feet above the screened interval. A bentonite seal will be set upon the sand and cement grout, placed using a tremie pipe, will be used to seal the remainder of the annular space. The exploratory borings will be backfilled with cement grout placed through the augers using a tremie pipe. Drill cuttings generated from the drilling will be placed on plastic sheeting and covered. Groundwater removed from the well will be drummed. Both will be left at the site pending the results of the laboratory analyses. It will be the responsibility of Roberts Petroleum to properly dispose of any contaminated soil or groundwater.