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Ow <br /> Mr. Kyle Christie <br /> January 14, 1991 <br /> Page 12 <br /> groundwater <br /> in late April 1988,the groundwater flow direction was inf1rd treduce <br /> du eetIavels of <br /> Beginning . of the remediation system designed recovery pump stopped - <br /> recovery system installed <br /> as rel 1989.the sec rY <br /> und�vatrr• Sore*".time in/ P of the recovery systetti'is now <br /> petroleum constituents in the gro R9p <br /> operating. I he malfunction was dotecu%d in June • of the pump. <br /> te, The recovery system was experiencing unexplained fluctuations in the lower explosive <br /> comple well and controlled operation <br /> level(LEL)meter,which was located in the wove of fluctuations of vaPors within the recovery <br /> The fluctuations have been shown to be also installed as required by the <br /> re the LEL meter was relocated to the yell vault,and there has been no abnormal <br /> well. There product separator tank discharge <br /> LEL readings since relocation• p► p ret PWD)as a final treatment metlt�of the wells for <br /> City of Stockton Public Works Dere has not been free product identified in any being reissued. <br /> to the sanitary <br /> sewer system. Y currently <br /> ears. permits for discharge from the Cit of Stockton P• are <br /> several y <br /> System startup should occur in January 1991. <br /> Conclusions a and are partially filled <br /> Emcon are generally very slow to recharge <br /> vela to provide accurate v+�r <br /> Monitoring wells installed by well has been <br /> The cause of LEL meter fluctuations in thce recovery„em has been <br /> with silts and clays in some cases. These wells should be cede ; <br /> quality and water-level data a to the sanitary sewer. <br /> identified and the LEL meter has been City <br /> ofedock on P well for di�harg,very' tem can be <br /> tden uirements of the Ciry of,5 the recovery Sys <br /> modified to meet req ermits by the City of Stockton PWD, the nort}teast. <br /> Pending final approval of p groundwater movement is to <br /> reactivated. Under static conditions,the direction of .0123. <br /> Please direct any questions regarding this project to me at(916,444 <br /> Very truly yours, <br /> BROWN AND CALDWELL <br /> Steven D. Misner , <br /> Project Manager <br /> SDM:SP:mkw <br /> Enclosure County Department <br /> cclmc: Ms.Laurie Cotulla,San neon qui.n Health Dep <br /> Mr.John Randall,Che <br /> Mr.Chris Winsor, ARCO Products Company <br /> 4 <br /> grown and Caldwell <br />