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from the last soundings As a result of the change in water table elevations, the hydraulic gradient <br /> of the water table has changed slightly The original direction of flow gradient was South 75 degrees <br /> East,and on 10/19/98 it was almost due East The 4/1/99 gradient is down slope North 80 degrees <br /> East with S=0 002 The latest soundings show the down slope gradient to be t <br /> nth S-©0016 Pump rates for purging continue to be between 1 0 gpm and 2 0 gpm <br /> WATER SAMPLE ANALYSIS FINDINGS <br /> In general, monitoring well samples taken on 9/9/99 tested lower in chlorine compound <br /> concentrations than did the samples taken on 4/1/99 (see BTEX & PURGEABLE <br /> HALOCARBONS summary) Analysis by EPA Test Method 8260A was not repeated,as the 4/l/99 <br /> samples were non-detect <br /> CONCLUSIONS <br /> BETX compounds in the MW#3S remain near the same concentrations as the last sampling event <br /> This monitoring well is receiving the highest impact of all the wells duc to TANK#1( the <br /> Stoddard's Solvent tank),which is Northwest of M W#3S Small detectable amounts of BTEX have <br /> appeared in all of the monitoring wells on this event <br /> Chlorine compounds are present in low concentration in all but MW#4S The Halocarbons <br /> concentrations in water samples are somewhat lower than the last testing period (see graph of two <br /> chlorine compounds for MW42S) <br /> RECOMMENDATIONS <br /> The author recommends that all monitoring wells be sampled in the forth quarter of 1999 to expand <br /> and reinforce the present monitoring well data <br /> Please contact this office at 209/368-9381 if any questions arise from this report Please also note <br /> the new mailing address for Mrs Higgins, below <br /> Respectfully submitted, <br /> Foot ee g W �G <br /> ' No 157'5 <br /> a <br /> P r1 <br /> Ervin Rifenb g, RCE <br /> cc Mrs Helen Higgins, 3461 COVELLO CIRCLE <br /> CAMERON PARK, CA 95682 <br /> 2 <br />