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GEO-PHASE <br /> ENVIRONMENTAL <br /> February 28, 2000 <br /> Mr. Jeff Wong <br /> San Joaquin County-Public Health Services <br /> Environmental Health Division <br /> 304 East Webber Avenue <br /> Stockton, CA 95202 <br /> Re: Well Destruction& Monitoring Well Installation <br /> 9909 East Woodward Avenue,Manteca CA <br /> Dear Mr. Wong: <br /> It is currently proposed that two monitoring wells be installed at the site. Please see the <br /> attached letters entitled: <br /> Letter Report Discussing Geo-Probe Installation Results, 9909 E. Woodward Avenue, <br /> Manteca Ca, dated February 15, 2000, and <br /> Final Well Location, 9909 E. Woodward Avenue, Manteca Ca, dated February 15, 2000. <br /> In conjunction with the installation of two monitoring wells at the site it was proposed that <br /> one monitoring well (MW-5) be destroyed at the above site, as indicated in the directive letter <br /> from the RWQCB dated January 13, 2000. Pursuant to the conversation of January 24, 2000 <br /> and the SJC-PHS-EHD's requirements for well destruction, the following information is <br /> attached: <br /> • A permit application for the destruction of the monitoring well, and <br /> • A well construction schematic showing the completion details for MW-5. <br /> The following calculation was used to determine the anticipated amount of grout needed to <br /> completely seal the well and associated filter pack material. <br /> (7C(r,)2 x h,(p) - 1C(r2)2 x h,) +1C(r2)2 x h,= grout volume (cu. ft), where, <br /> Tc=3.14 <br /> r,=radius of annulus (8") <br /> rz=radius of casing (2") <br /> h,=height of filter pack (20' to 4', 16' thick) <br /> h,=height of casing (20') <br /> p=porosity of filter pack (30% voids) <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />