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to TPHg= 109 ppb in three months is very unusual. This monitoring well is positioned to monitor a <br /> very permeable aquifer at sixty feet ofdepth.The only physical change during this event is the slope and <br /> . direction ofthe surface hydraulic gradient. IfMW-8S was on the very southeast edge ofthe plume,this <br /> small change in gradient direction may move the plume outside of the monitoring area of the well. <br /> Recommendations <br /> The author recommends that monitoring well sampling continue on a quarterly basics. <br /> Please contact Ervin Rifenburg ofthis office at(209)368-9381 ifyou have any questions on this report. <br /> Respectfully submitted, a� Eg&0' <br /> JUFlFNgG9 <br /> No. t 67'52 �o <br /> Footh' n 'neering 6+a t �F <br /> ` �rOFCAt <br /> T3 � <br /> Ervin Ri nburg, P <br /> cc: Michael D. & Sharon Olivarez, 436 W. Scotts Av. Stockton, Ca. <br /> • <br /> 3 <br />