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- 11��� <br /> rr� . <br />�e <br /> -Mr. Kyle Christie <br /> Ja ivary 14, 3991 <br /> Page 12 <br /> f <br /> Beginning in late April 1988,the groundwater flow direction was influenced by the groundwater <br /> recovery system installed as part.of the remediation,system designed to reduce the levels of <br /> petroleum constituents in the groundwater. Some tim 'in April 1989,the recovery pump stopped <br /> Operating. The malfunction was detected in June 1989, ^.epair of the recovery system is now <br /> complete: The recovery system was experiencing unexplained fluctuations in the lowerexplosive <br /> level(LEL) meter, which was located in the recovery well and controlled operation cf the pump. <br /> The fluctuations have been shown to be the result of fluctuations of vapors within the recomy <br /> well. Therefore,the LEL meter was relocated to the well vault,and there has been no abnormal <br /> LEL readings since relocation. A product separator tank was also installed as required by the <br /> City of Stockton Public Works, (PWD)as a rtnal treatment method before discharge <br /> to the saritary sewer system. [here has not been free product identified in any of the wells for <br /> several years. Permits for discharge from the City of Stockton PWD are currently being reissued. <br /> System startup should occ,,, in January 1991. <br /> Conclusions <br /> Monitoring wells installed by Emcon are generally very slow to recharge and are partially filled <br /> with silts and clays in some cases. These wells should be redeveloped to provide accurate water <br /> quality and water-level data. The cause of LEI,meter fluctuations in the recovery well has been <br /> identified and the LEL meter has been relocated to the well valla. The recovery system has been <br /> modified to meet requirernetiis of the City of Stockum PWD for discharge to the sanitary sewer. <br /> Pending imaI apprevaf of permits by the City of Stockton PWD, tht._mcovery system can be <br /> reactivated. Under static conditions,the direction of groundwater movement is to the northeast, . <br /> Please direct any questions regarding this project to me at (916)444-0123. <br /> Very truly yours, <br /> BROWN AND CALDWELL <br /> 1 ` <br /> Steven D. Misner <br /> Project Manager <br /> SDM:SP:mkw' <br /> Enclosure <br /> cc/enc: Ms. Laurie Cotulla, San Joaquin County Health Department <br /> Mr. John Randall, Chevron <br /> Mr. Chris Wirsor,ARCO Products Company <br /> Brawn a°td Caldwall <br />