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m moldenhauer <br /> L.ALEX MOLDENHAUER,L.S.,P.E. <br /> e engineering PRINCIPAL <br /> c company <br /> 337.871 <br /> December 22, 1989 <br /> Antonia K.J. Vorster US <br /> Supervising Engineer DEC 2 7 100-33 <br /> California Regional Water Quality Control Board- 4L HEALTH <br /> Central Valley Region <br /> 3443 Routier Road PEii,., " '" VICES <br /> Sacramento, Ca 95827-3098 <br /> Subject: Southwest Hide Company, San Joaquin County <br /> On August 1 , 1989, Moldenhauer Engineering Company (MEC) submitted for Southwest <br /> Hide Company, a Beneficial Use and Remedial Action Report. As the title implies, <br /> this report presented several suggestions for remedial action at the Southwest <br /> Hide Company property near Manteca, California. Because of the cost of <br /> investigating and implementing one or more of these actions, it was decided that <br /> waiting for the input and requirements of the regulatory agency was the prudent <br /> course of action. <br /> The established ground water monitoring program was continued during this four <br /> month holding period and several more sets of elevation data now exist for tile <br /> Manteca Property. Any additional work however, seemed premature in light of the <br /> value of the Regional Board' s feedback. <br /> The two old production wells on the Southwest Hide Company property were <br /> abandoned on September 5 and 6, 1989, as per the design submitted to the Regional <br /> Water Quality Board. This procedure was virtually identical for both wells and <br /> consisted of cleaning the wells by displacing sediments with viscous drilling <br /> mud. Once clean, the holes were filled with a dense bentonite slurry which <br /> displaced the drilling mud used in the cleaning process and acted as a permanent <br /> seal for the hole. Prior to the bentonite setting up, a cutting tool was used <br /> to split the old casing so that the bentonite might enter into the annular <br /> spacing. San Joaquin County Health Inspector, Elanor Ratliff, was on site during <br /> the final stages of abandonment for both product�o'-n teTTs. <br /> The water quality data from the new monitoring wells are included in appendix A <br /> and were received on July 31, 1989. This date fell one day before tile <br /> Beneficial Use and Remedial Action Report deadline and was thus omitted from that <br /> report. <br /> 1107 KENNEDY PLACE,SUITE 7,DAVIS.CA 95616•(916)756-2250 <br /> E N G I N E E R I N G c O N S U L T A N T S 0 P R O J E C T P L A N N E R S <br />