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f "�' <br /> 333 East Main Street <br /> � P.O.Box 388 <br /> Elk River,MN 55330 <br /> (763)441-7509 <br /> � SiYiS�TEMS (800)554-7509 <br /> Fax:(763)441-9176 <br /> ECO SYSTEMS ENGINEERING,INC. A-R1dl�:h2018b�11(dlllflk.tl9i <br /> July 9, 2003 ���E�VE� <br /> PeterThiss '�p� � � ���a <br /> 34 Water Street CITY UF p�pNO <br /> Suite 200 <br /> Excelsior,MN 55331 <br /> Subject: Piezometers and Monitoring Well Installation <br /> 270 Big Island; City of Orono <br /> Hennepin County,Minnesota. <br /> Mr. Thiss, <br /> As requested, Eco Systems Engineering visited the subject site and installed three piezometers <br /> and one monitoring well. The piezometers and monitoring well will allow the observation of <br /> groundwater elevations on the subject property. The groundwater elevations will be recorded for <br /> a minimum of 12 months to determine the presence of high groundwater on the subject site. The <br /> presence of high groundwater is a detemuning factor in the locating of a drain field for a new <br /> onsite wastewater system(OWS). <br /> Three piezometers were installed at depths of 66 inches, 38 inches and 28 inches below the <br /> ground surface. These depths were selected based on the results of ow soil investigation <br /> indicating a soil texture, soil color or soil structure change at or neaz these depths. The <br /> piezometers are constructed of 1.5 inch schedule 40 pvc pipe with the bottom of the pipe capped. <br /> Holes were drilled from the bottom of the pipe to six inches from the bottom of the pipe. A <br /> mesh screen was installed around the perforated area of the pipe to prevent clogging. A sand <br /> pack was installed around and 2 inches above the screened area with a bentonite bacl�ill to the <br /> ground surface. <br /> One monitoring well was installed to a depth of 68 inches. The monitoring well is constructed of <br /> 1.5 inch schedule 40 pvc pipe with the bottom of the pipe capped. Holes were drilled from the <br /> bottom of the pipe to within 12 inches from the ground surface. A mesh screen was installed <br /> around the perforated area of the pipe to prevent clogging. A sand pack was installed azound and <br /> 2 inches above the screened area with a bentonite backfill to the ground surface. <br /> At the time of the installation, groundwater was not observed in any of the piezometers or the <br /> monitoring well. Observations will be made and recorded at a minimum of once per month for <br />