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27 July 1998 <br /> AGE-NC Protect No 95-0121 <br />' Page 4 of 4 <br />' of 0 002 ft/ft, or approximately 13 feet per mile (Figure 3) Due to the low gradient at the <br /> site, slight variations in ground water measurements or changes of recharge/discharge of the <br /> local ground water could greatly modify ground water flow direction <br />' • The ground water surface elevation at the site continues to remain above the slotted screened <br /> Intervals in wells MW-1 through MW-5 Therefore, the sample collected from well MW-3 <br /> may not be representative of concentrations of dissolved petroleum hydrocarbon in shallow <br />' ground water on the site <br /> • From November 1994 to June 1998,no substantial increase and/or decrease of concentrations <br />' of dissolved petroleum hydrocarbon were reported in samples collected from MW-3 <br /> • Concentrations of benzene,toluene,ethylbenzene and xylenes detected in MW-3 were above <br />' the State of Califomia Maximum Contaminant Levels (MCL) for drinking water of 1 ppb, <br /> 150 ppb, 700 ppb and 1750 ppb, respectively However, due to a submerged screen interval <br /> in well MW-3, BTE&X concentrations detected from this well may not be representative of <br />' shallow ground water dissolved petroleum hydrocarbon concentrations <br /> • MTBE was not detected at concentrations higher than the laboratory reporting limits in the <br /> ground water sample collected from MW-3 <br />' 50. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br />' environmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic <br />' conditions at the site for the purpose of this investigation are made from a limited number of <br /> available data points (I a monitoring wells), and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or Implied, is made as to the professional <br /> recommendations contained in this report <br /> 1 <br /> I <br /> Advanced GcoEnvironmental,Inc <br /> I <br />