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kn KLEINFELDER G°�ECEWED <br /> An employee o,+aveA company <br /> ' File No. 65078.T02 OCT - 6 2006 <br /> June 9, 2006 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Tom Luckey <br /> TCN Properties <br /> P.O. Box 317 <br /> Lathrop, CA 95301 <br /> ' Subject: Letter Report <br /> Groundwater Monitoring Well Installation, Development, <br /> and Groundwater and Surface Water Sampling <br /> M-6 Pump Station - Mossdale Landing <br /> Lathrop, California <br /> Dear Mr. Luckey: <br /> t Kleinfelder installed a single monitoring well (P-M6) on parcel 241-020-51 in Lathrop, <br /> California (Plate 1). The monitoring well was developed and a groundwater sample was <br /> collected from the well. A surface water sample was also collected from the San Joaquin <br /> River. Both water samples were submitted for laboratory analysis. Kleinfelder conducted <br /> these activities in accordance with our proposal No. 02001 PROP.ENV/ST06P01 4, dated <br /> ' January 11, 2006. It is Kleinfelder 's understanding that the results of the analysis will be <br /> used to assess the baseline groundwater quality in the vicinity of the proposed pumping <br /> station (M-6) at Mossdale Landing. <br /> iMonitoring Well Installation <br /> ' A single monitoring well (P-M6) was installed on January 20, 2006 by Spectrum <br /> Exploration of Stockton, California. Prior to the installation Kleinfelder obtained a well <br /> permit from the San Joaquin County Environmental Health Department (EHD). A Copy <br /> of the permit is included in Attachment B. The monitoring well was installed as <br /> generally described in Attachment A-2 and A-3. The boring was advanced with a 6-inch <br /> hollow stem aurger to approximately 25 feet below the ground surface (bgs). <br /> Groundwater was encountered during the drilling at approximately 15 feet bgs and <br /> heaving sands were noted at approximately 20 feet bgs. During the installation of the <br /> well, the loss of approximately 1'/2 feet of the boring due to heaving sands resulted in <br /> the total depth of the well being approximately 23'/2 feet bgs. The heaving sands also <br /> caused some native sands to rise in the borehole during the well construction and <br /> surround several feet of the well screen near the bottom of the boring. The well was <br /> constructed with a 2-inch diameter Schedule 40 PVC, a 15 foot long 0.010 inch mill cut <br /> slot screened section, and surrounded to the fullest extent by a clean sand filter pack. An <br /> approximately 2-foot thick bentonite transition seal was installed above the filter pack. <br /> ' 65076.T02/ST06R506/FB:Iv Page 1 of 4 <br /> ©2006 Kleinfelder, Inc. June 9,2006 <br /> KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205-4794 (209) 948-1345 (209) 948-0621 fax <br />