Laserfiche WebLink
Water samples collected in previous monitoring events indicate that groundwater is impacted <br /> to the north, west and south of the tank cavity. The present investigation indicated that low <br />' concentration of petroleum hydrocarbons are present near the eastern edge of the site It <br /> is likely that MW-5 is located near the downgradient (eastward) extent of the impacted <br />' groundwater plume. <br /> However, the concentrations of toluene and xylenes in MW-5 do not exceed the State of <br /> California Maximum Contaminant Levels (MCL) or Action Levels (AL) for drinking water <br /> The AL for toluene is 100 ppb, the MCL for xylene is 1,750 ppb <br />' A limited pumping of MW-2 or MW-3 has been proposed to determine the effect of Iimited <br /> groundwater extraction on the contaminant plume Upon approval from Comfort Air, Inc, <br /> the limited extraction will be scheduled during the next quarter The next quarterly <br /> Imonitoring event should be scheduled in September 1994 <br />' 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily <br /> exercised by environmental consultants practicing in this or similar locahties The findings <br /> were based upon analytical results provided by an independent laboratory Evaluations of <br /> the geologw/hydrogeologic conditions at the site for the purpose of this investigation are <br /> made from a limited number of available data points (n a monitoring wells, soil samples) <br /> and subsurface conditions may vary away from these data points No other warranty, <br /> expressed or implied, is made as to the professional recommendations contained in this <br /> rreport <br /> I <br /> t�,1,P1 nrdq sem .. 9 <br /> CenbM1 1[9Y IaUIT SJ14,Rrr1991 <br /> I <br />