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q" <br /> T" August 8, 1988 AGS Job No. 38053-1 <br /> Farmer Texaco Service Station, Manteca, California <br /> Laboratory Analyses <br /> r) <br /> The sail samples selected for testing will be analyzed for total <br /> petroleum hydrocarbons (TPH) by Environmental Protection Agency <br /> (EPA) Method 8015 (modified for gasoline) ; the volatile <br /> hydrocarbon constituents benzene; toluene, ethylbenzene, and <br /> total xylene isomers (BTEX) by EPA Method 8020; and organic lead <br /> by EPA Method 7420. The water samples will be analyzed for TPH <br /> by EPA Method 8015 and for BTEX by EPA Method 502. Detection <br /> limits suitable for the tests requested and concentrations <br /> present will be stated on the laboratory reports. The tests will <br /> be performed by a laboratory certified by the State of California <br /> for the analyses requested. <br /> Gradient Calculations <br /> The ground-water gradient will be calculated to provide an <br /> indication of the direction of ground--water flow at the site. <br /> Differences in elevation between the tops of the well casings <br /> will be measured with an automatic level. Water-depth <br /> measurements will be made with an electric water-level indicator. <br /> These data will be combined to calculate the relative elevation <br /> of the ground-water surface in each well and the slope of the <br /> potentiometric surface across the site. <br /> 14 <br /> `' Agolied 0eoSystOn7s - <br />