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r March 16, 1988 ` r- . i 1 r Roberts Oil Company Page 8 California certified analytical laboratory. All soil cuttings generated by the borehole drilling and sampling operations will be drummed and stored onsite. Should the laboratory analyses indicate that the soils encountered during the drilling and sampling operations be contaminated, it shall be the responsibility of Roberts Oil Company to properly dispose of the contaminated soils. Exceltech can assist Roberts Oil Company in making arrangements for the transportation and proper disposal of contaminated soils on a time and material cost basis. Additional ground water quality monitoring wells (up to 3) will be installed in selected boreholes upgradient and downgradient from the transfer block/loading area, for the purpose of determining the intensity and lateral extent of refined petroleum product contaminated ground water, and to better define the hydraulic gradient and ground water flow direction. The ground water quality monitoring wells to be installed will be completed in the soil sampling boreholes drilled and sampled under Task 4. Exceltech will obtain the necessary Permits to install the ground water quality monitoring wells from the County of San Joaquin Local Health District (SJLHD). SJLHD regulations require that the placement of sanitary grout seals be inspected by a County employed inspector at the expense of the Owner of the Work. Further, Roberts Oil Company will be required to sign an Authorization to Release Analytical Results, Geotechnical Data and Site Assessment Information to the SJLHD prior to installing the ground water quality monitoring wells. All well screen/casing strings will be thoroughly steam cleaned prior to insertion in the borehole. All wel! construction materials (gravel pack, bentonite, and cement) will be stockpiled away from drilling activities on plastic sheeting to prevent contamination. When the desired drilling depth has been reached, PVC casing, well screen, gravel pack, and bentonite seal will be installed inside the hollow stem auger string. After installation of well construction materials, the hollow stem auger string will be removed, leaving ithe completed well installation in the borehole. The cement/bentonite grout seal will then be tremied into place in the presence of a SJI.HD Inspector.