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US <br /> Mr.Marshall Cloud <br /> 10 June 2004 <br /> Page 2 <br /> A historical summary of the work performed near PZ4,PZ5, and PZ7,and destruction information of <br /> the piezometers are presented in the remainder of this memorandum. <br /> Bird and Lovely Road CPT Groundwater Investigation <br /> Prior to installation of the piezometers along Bird Road, a CPT groundwater investigation was <br /> conducted in the spring of 2001.During this investigation groundwater samples were collected from <br /> CPT borings located along Bird and Lovely Roads,located to the east and north of the DDJC Depot,to <br /> verify that groundwater contamination had not migrated further north and east of the Robertson <br /> Property located along Banta Road.Groundwater samples were collected for VOC analysis.All results <br /> were non-detect(ND).The results of this investigation are presented in Attachment 1. <br /> Boundary Piezometer Installation <br /> The boundary piezometers in question,PZ4,PZ5, and PZ7 were installed in June 2001 by URS under <br /> county permit number SR0024773.Piezometer construction and lithology information is presented in <br /> Table 1. The boundary piezometers are shown on the figure presented in Attachment 2. <br /> Table 1. Well Construction Information, Boundary Piezometers <br /> PZ4, PZ5, and PZ7, DDJC-Tracy <br /> Top of Lithology <br /> Surface Casing Top of Bottom of in Well <br /> Elevation Elevation Screen Screen Screen <br /> Piezometer Northing Easting (ft msl) (ft msl) (ft b s) (ft bgs) Interval <br /> PZ4 2092507.25 6312465.35 39.63 39.32 9 14 CL <br /> PZ5 2090397.13 6312458.14 49.28 49.09 52 57 ML <br /> PZ7 2090392.48 6312458.12 49.13 48.76 13 18 SW-SM <br /> CL = clay,silty clay <br /> it = feet <br /> ML = silt <br /> ms] = mean sea level <br /> SM = silty sand <br /> SW = well-graded sand <br /> Discovery of Destroyed Piezometers <br /> On 26 February 2004,URS field personnel discovered that the piezometers had been destroyed. URS <br /> field personnel obtained a business card from Mr. George Edwards,the field senior engineer for Nolte <br /> Associates, who was present at the time URS personnel found the piezometers destroyed. <br /> On 11 March 2004,URS field personnel confirmed that piezometer PZ-4 had also been destroyed or <br /> buried under soil that may have been excavated during the installation of the pipeline. A 1-foot section <br /> of 1'h-inch-diameter PVC pipe was found near PZ-4;however,neither the protective traffic cover,or <br /> PVC casing for the piezometer were located. <br /> K:%Wpr ess\00701\Tmcy1PZDestr ction�SJCEHDMemo.dw <br />