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Mr Terry Tarditi <br /> August 19, 2004 <br />' Page 3 <br />' Analytical laboratory Kiff Analytical, Inc, <br /> Davis, California <br /> (California Department of <br />' Toxic Substances Control <br /> Certification No 2336) <br /> Sample exceptions None <br /> Shallow groundwater gradient (3rd qtr/4th qtr) Flat <br /> Shallow groundwater flow direction (31d qtr/4d'qtr) Flat <br /> Average depth-to-water (2nd qtr) 71 86 feet <br /> Average change in shallow groundwater <br /> elevation from 41'to 211d qtr -121 feet <br /> DISCUSSION <br /> Based on the second quarter's data, the groundwater hydraulic gradient remains <br /> flat, as shown in Figure 2 <br /> BTEX The reporting limits for all constituent concentrations in MW-1 were <br /> increased due to known high concentrations of MtBE The dilutions were <br /> necessary because the MtBE concentrations were out of the calibration range for <br />' the target analyte Samples from MW-1 are analyzed multiple tunes by the <br /> analytical laboratory to bring the correct dilution into the calibration range BTEX <br /> concentrations were below their respective reporting limits in wells MW-2,MW-3 <br /> and MW-4 These results are consistent with previous quarters Per the <br /> PHS/EHD's request,BC will work with the analytical laboratory to determine if it <br /> is feasible to quantify the BTEX constituents without damaging the equipment <br />' TPH-g Consistent with previous quarters,low TPH-g concentrations <br /> (100 micrograms per titer Vg/L]) were detected in MW-3 TPH-G concentrations <br /> remain below the method reporting liimit of 50 µg/L in MW-2 and MW-4 In well <br /> MW-1 during the 3rd and 4111 quarters of 2003,TPH-g reporting limits decreased <br /> from 20,000 µg/L to 5,000 µg/L respectively This quarter's reporting limits <br /> decreased to 2,500 R/L without detectable concentrations reported in any of the <br /> samples <br />' MtBE MtBE concentrations were detected in samples from monitoring wells <br /> MW-1, MW-3, and MW-4 MtBE has never been detected in samples from the <br /> Supply Well MtBE concentrations decreased below the detection level of <br /> 0 50 µg/L for monitoring well MW-2 In MW-1, MtBE concentrations increased <br /> from 27,000 µg/L in the fourth quarter 2003 to 62,000 µg/L this quarter In wells <br /> This report zas prepared in acrordance anth the standards of the environmental consulting industry at the time a aw prrparsd If should not be <br /> need upon by par7tes oilier than thare far whom it uas prrpand,and then only to tlx stent of the srope of nrork m6ich uw.i authon{d This <br /> rrport does not guarantee tbat no addrttonal enuronmental contamination beyond that described in this rrport exists at the site <br />' P\21000\21417-T&T\Reports\2nd 04gtr doc <br /> R <br />