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In general,all of the monitoring well groundwater samples,with the exception ofMW-6,yielded lower. <br /> concentrations of TPHg than last quarter. MW-6 groundwater sample analyzed in the same range of <br /> concentration as the last monitoring event. <br /> Recommendations II/L <br /> The author recommends that monitoring well sampling be continued on a quarterly basis. It is also <br /> recommended that a 15"diameter pump test well be installed to determine the permeability of the sand <br /> aquifer that lies between 50'and 65'feet of depth.The permeability of this aquifer is required to design <br /> a suitable and effective groundwater pump and treat system. <br /> Please contact Ervin Rifenburg ofthis office at(209)368-9381 ifyou have any questions on this report. <br /> Respectfully submitted, <br /> HS-EHD <br /> Foot ' ngi <br /> FEp�U <br /> CM rn <br /> Ervin Rife burg, <br /> OF <br /> cc: Michael D. & Sharon Olivarez, 436 W. Scotts Av. Stockton, Ca. <br /> 3 <br />