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iSubjective Ground-Water Observations Working To Restore Nature The depth to ground water in the monitoring wells is measured to the nearest 0 01-foot with an electronic water-level indicator Samples of ground water are collected for subjective analysis from the air-fluid interface in each well by lowering approximately half the length of a clear Teflon bailer through the interface The bailer is retrieved and the water sample examined for free product, sheen, or other subjective evidence of hydrocarbons Ground-Water Sampling Ground-water samples are collected after water in each well recovered to near its original level The ground-water samples are collected by lowering a clean Teflon bailer gently through the air-water interface to a depth approximately 3 feet below the ground-water surface The bailer is retrieved and the samples are transferred slowly to laboratory- cleaned, 40-milliliter glass vials or other appropriate containers as required by the laboratory The vials and bottles contain hydrochloric acid (or other appropriate preservative) and are filled so that no head space is left in the containers The field technician initiates a Chain of Custody Record and it accompanies the samples to the analytical laboratory A copy of that record is attached to this letter report Gradient and Direction of Ground-Water Flow Tom O Morrow, a licensed land surveyor, produced a site map showing the location of the wells and other site features with listing of the horizontal and vertical references of the monitoring wells The elevation of the monitoring wells are referenced to within 0 01-foot of a nearby United States Geodetic Survey, County, or City bench mark The horizontal distances are measured to the nearest 01-foot The ground-water elevation in each monitoring well is calculated by subtracting the depth to water from the wellhead elevation The ground-water elevation information is used to evaluate the direction of ground-water flow, evaluate the ground-water gradient, and construct a ground-water gradient or potentiometric map Disposal of Drill Cuttings and Pure Water Drill cuttings generated during drilling of borings B-14 through B-19 were stored in a bin provided by Dillard Trucking Four soil samples were collected from the drill cuttings and composited into one sample by the laboratory for analyses Analytical results of this sample were used to evaluate disposal options of the drill cuttings Dillard has been contacted and is scheduling to dispose of soil on September 2, 1992, to BFI Landfill in Livermore, California Water generated during the pumping test and development of wells MW-9 through MW-13 and PTV-1 was stored in a Baker tank onsite A grab sample was collected from the tank for laboratory analyses to evaluate disposal options of the water Purge water was disposed of in the sanitary sewer on September 4, 1992 38032-10 I