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GEORGE DEUKMEJIAN.G"ernor <br /> CA•LII"QP,NIA REGIONAL WATER JALITY CONTROL BOARD— <br /> CEf,.[TRAL VALLI Y REGION <br /> 3343 ROUT;cR'ROAD .,��.:-- _ <br /> SACRAMENTO,CA 9587.7-3098 <br /> 1.5 February 19sq <br /> Mr. Jack Ronsko Public D <br /> Warks Director <br /> City of nodi FEB 181989 <br /> .1331 S . Ham Lane <br /> Lodz, CA_ 95240 WHITLEY, BURCHETT <br /> AND ASSOC., INC. <br /> GROUND WATER MONITORING PROPOSAL FOR WHITE SLOUGH WATER POLLUTION <br /> CONTROL PLANT, SAN JOAQUIN COUNTY <br /> 'Ne 1—lave cor„pleted our r eviti-w of the subject proposal submitted on <br /> the City' s behalf by Whitley, Burchett and Associates on 25 <br /> January 1989. Based on this review we offer the fallowing <br /> recommendations: <br /> 1• Monitoring wells should be at least four inches in diameter, <br /> not two inches as specified in the proposal. Four inch <br /> wells are generally easier to develop and sample and can be <br /> used for extraction purposes if need be. <br /> 2 . The depth of the wells should be determined in the field, <br /> not predetermined at 20 feet as the proposal suggests. We <br /> recommend that well depth and construction parameters be <br /> determined in "the field. This determination should be based <br /> On the lithologic information obtained by the well logs <br /> 3 . The proposed location of the upgradient weld. WSM-01 is <br /> questionable. We question whether the proposed location is <br /> outside the influence of the ponds. Data saFbmitted with the <br /> subject report suggest not. Furthermore, isn't the proposed <br /> location on or near land that is irrigated with reclaimed <br /> (pond) water? <br /> The objective of an upgradient monitoring well is to <br /> determine the cnaal _ty of the ground water <br /> prior to the point <br /> of compliance. Positioning of WSM-01 at the proposed <br /> location will not establish background water quality, <br /> 4. The most recent DWR well data submitted with the subject <br /> report indicates that a perched ground water zone exist~ not <br /> too far north of the Plant boundary. The eater table <br /> elevation in DWR well 19-35 is much higher -than down- <br /> gradient wells on a consistent basis. This factor should be <br /> considered when deciding on the location of the upgradient <br /> well . <br />