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Mr. Mike Huggins <br /> February 9, 2009 Groundwater Monitoring Plan <br /> Page 7 of 8 Granite Construction Company,Vernalis Plant i <br /> t <br /> Water level measurements and quality analyses in the identified well network(Figures 19 and 20)will a <br /> continue to provide the necessary data to evaluate long-terra groundwater conditions in both the shallow <br /> and deep aquifers. A semi-annual monitoring frequency is deemed sufficient for this purpose'. <br /> Please let me know if you have any questions. <br /> Sincerely, NAL <br /> pNAL ")NAL CaFp1 <br /> LUDORFF AND SCALMANINI, 0 <br /> p� �a tC' QFiQ <br /> CONSULTING ENGINEERS pk tS,'�0 �� ► ON <br /> a Z a a H �No.8Es3 Z -� <br /> * <br /> CERTIFIED <br /> Ar -.No. 7765 NYDROGE0I.OGIST <br /> Till Ang nn to 4 q �j► =meq <br /> Project ogeologi <br /> 9 OF CAOOF CAL�F� <br /> tea/TEA <br /> i <br /> I Cc: Mr. Brian Hoffman,Mr. Jeff Otto,and Mr.Bruce Bunting, Granite Construction Company— <br />' Stockton Branch,P.O.Box 154, Stockton, CA 95201 <br /> i <br /> Figures <br /> Figure 21 Location Map,Granite Construction Company,Vernalis Plant <br /> Figure 2 Site Map and Well Locations,Granite Vernalis Plant Area, San Joaquin County <br /> Figure 3 Shallow Groundwater Levels,Granite Vernalis Plant Area, San Joaquin County <br /> Figure 4 Historical Shallow Groundwater Levels, State Well No. 4S/6E-5A1,Granite Vernalis <br /> Plant Area,San Joaquin County <br /> I Figure 5 Contours of Equal Groundwater Elevation;-Spring 1994,Granite Vernalis Plant Area, San <br /> Joaquin County j <br /> Figure 6 Contours of Equal Groundwater Elevation, Spring 1998,Granite Vernalis Plant Area, San <br /> Joaquin County <br /> Figure 7 Contours of Equal Groundwater Elevation, Spring 2000, Granite Vernalis Plant Area, San <br /> Joaquin County <br /> Figure 8 Contours of Equal Groundwater Elevation, Spring 2002, Granite Vernalis Plant Area, San <br /> Joaquin County <br /> Figure 9 Contours of Equal Groundwater Elevation,May 2008,Granite Vernalis Plant Area, San i <br /> Joaquin County <br /> Figure 10 Deep Groundwater Levels, Granite Vernalis Plant Area, San Joaquin County <br /> Figure 11 Electrical Conductivity Values in Wells, Granite Vernalis Plant Area, San Joaquin County <br /> Figure 12 General Mineral Constituent Concentrations in the Hall Well, Granite Vernalis Plant Area, <br /> San Joaquin County <br /> Figure 13 General Mineral Constituent Concentrations in the South Tracy#1 Well, Granite Vernalis <br /> Plant Area, San Joaquin County <br /> It is recognized that Teichert has been conducting quarterly groundwater monitoring for its Vernalis plant. <br /> However, Teichert's monitoring record demonstrates that such frequent monitoring has produced redundant <br /> data in excess of what is needed for the groundwater conditions evaluation. <br /> ' © LUM©OF1FF 6 SCALMANINI <br /> CIDINSULTING E N G I N E E F 5 <br />