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09 November 2009 <br /> AGE-NC Project No. 96-0236 <br /> Page 2 of 2 <br /> (equipped with 1.25-inch, stainless steel, hollow probing rods) based on depths of 50 feet bsg. <br /> Ilowever, it is not likely that a Geoprobe 5400 will successfully achieve depths of 75 feet bsg. <br /> Therefore, AGE is proposing to utilize a 25-ton cone penetration testing (CPT) drill rig equipped <br /> with 13/�-inch diameter hollow-stem rods to advance a hydro-punch sampling assembly to collect <br /> grab water samples from borings P-16 through P-21. The hydro-punch sample tool will be pushed <br /> into the specified zone, then withdrawn approximately three feet to expose an inlet screen. The <br /> interior of the sampling tool should then fill with formation water. Then water from within the <br /> sampling rods would be collected utilizing a %-inch diameter, stainless steel bailer. <br /> Procedures for collection and analysis of grab water samples will be followed as described in the <br /> above referenced work plan addendum (Work Plan Addendairn, dated 29 December 2009). If you <br /> have any questions or comments, please contact the undersigned at(209)467-1006. <br /> Sincerely, <br /> Advanced Geo Environmental, Inc. <br /> X04~\55 M <br /> `m <br /> No 7473 �* <br /> Timothy . Cuellar <br /> Senior ProjectGeologist William R. Little <br /> Senior Project Geologist �P <br /> CaliforniaProfessionalGeologist No. 7473 <br /> enclosure <br /> cc: Mr. Jim Barton, California Regional Water Quality Control Board-Central Valley Region <br /> Mr. Roger Hartley, Country Club Blvd. LLC <br />