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City of Lathrop 8617.000.000 <br /> Mossdale Landing Community Park, Monitoring Well Replacement May 5, 2009 <br /> SUMMARY OF MONITORING WELL INSTALLATION Page 3 <br /> for 30 minutes prior to sealing the remainder of the borehole with neat cement. The well casing <br /> was extended to just below the ground surface and a flush mounted traffic rated vault box with a <br /> lid was installed at the surface. Information regarding specific monitoring well construction is <br /> summarized on the attached installation log. <br /> A monitoring well installation permit was obtained and well construction activities were <br /> conducted in accordance with San Joaquin County requirements. A copy of the well permit is <br /> attached. <br /> At least 48 hours after completion of the well installation we developed the well to maximize the <br /> hydraulic connection between the well and the surrounding aquifer material. The well was <br /> purged using a 12-volt pump while monitoring stabilization of groundwater parameters <br /> (temperature, pH and electrical conductivity). Purging continued until flowing water was <br /> visually clear and at least seven well volumes had been purged from the well. Purge water was <br /> discharged to land onsite. A copy of the well development record, including quantity of water <br /> pumped, is attached. <br /> A licensed land surveyor was retained to establish horizontal coordinates and elevation data for the <br /> new monitoring well in accordance with Section 5.0 of the Master Well Work Plan. The survey <br /> results are included on the Site Plan(Figure 2). <br /> It is our understanding that this new well will be monitored by HydroFocus Inc. as part of the <br /> City of Lathrop's ongoing regional groundwater analysis. <br /> If you have any questions regarding any portion of this report, please call and we will be glad to <br /> discuss them with you. <br /> Very truly yours, <br /> ENGEO Incorpora oF� GRAA W o0`��s <br /> 8436 <br /> Exp.xp.3/311/2/2 <br /> 010 <br /> Crawford, PG Orf�F CA��F�� Shawn Munger, CHG <br /> zc/sm/dtwell <br /> cc: Mr. Bruce Myers,Pacific Union Homes (e-mail only) <br /> Mr.John Fio,HydroFocus Inc. (e-mail only) <br /> Mr.Dave Umezaki,ERI(e-mail only) <br /> Enclosures: Figure 1 —Vicinity Map <br /> Figure 2—Site Plan <br /> Monitoring Well Log for MWM-27 <br /> San Joaquin County Well Construction Permit <br /> Well Development Log <br />