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Mr Terry Tarditi <br /> May 11, 2004 <br /> Page 3 <br /> events are included as Attachment A Laboratory reports for the groundwater <br /> samples collected for these sampling events are included as Attachment B <br /> Analytical laboratory Ktf£Analytical, Inc, Davis, <br /> California (Cahforrua <br /> Department of Toxic Substances <br /> Control Certification No 2336) <br /> Sample exceptions None <br /> Shallow groundwater grachent (3rd/4th) 0 001/Flat <br /> Shallow groundwater flow direction (31d/4th) NW/Flat <br /> Average depth-to-water (3rd qtr) 72 17 feet <br /> Average depth-to-water (41h qtr) 70 66 feet <br /> Average change in shallow groundwater <br /> elevation from 2nd to 3rd qtr 6 81 feet <br /> Average change in shallow groundwater <br /> elevation from 3rd to 4th qtr -151 feet <br /> Discussion <br /> Based on the third and fourth quarter's data, the groundwater hydraulic gradient <br /> remains basically flat, as shown in Figures 2 and 3 <br /> Analytical constituents for each well from the 3rd and 4th quarters are shown on <br /> Figures 4 and 5, respectively <br /> BTEX The reporting limits for all constituent concentrations in MW-1 were <br /> decreased due to known high concentrations of MTBE in the samples from both <br /> quarters The dilutions were necessary because the MTBE concentrations were out <br /> of the calibration range for the target analyte Samples from MW-1 are analyzed <br /> multiple times by the analytical laboratory to bring the correct dilution into the <br /> calibration range BTEX concentrations were below their respective reporting <br /> limits in wells MW-2 and MW-4 for both quarters Only a low concentration of <br /> 3 3 µg/L was detected in the sample from MW-3 in the Yd quarter and below the <br /> detection level of 0 50 4g/L in the 4th quarter No other BTEX constituents from <br /> MW-3 were detected above their respective reporting limits in either quarter <br /> These results are consistent with previous quarters <br /> 1 hs r report mas prepared in aerorelance unth The standards of the ennronmenla!coniulteng indurlry at the time a uarr prepared l i shoxld not be <br /> irked upon by parties other than those for whom a was prepared and then only to The exienl of the reope of wrrrk which war aulhontied i hu <br /> reporl doe r nol&uatanlee Thai no additional entamnmenlal rontamrnaiion beyond Thai desenbed in this rrporl exul r al The Rte <br /> P\21000\21417\Reports\3rdand4th 03gtrs doc <br />