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kn KLEINFELDER <br /> An employee owned company <br /> File No. 85588.G02 <br /> December 12, 2007 <br /> San Joaquin County Environmental Health Department <br /> 600 E. Main Street <br /> Stockton, CA 95202 <br /> Subject: Groundwater Monitoring <br /> Southwest Corner of Highway 120 and Union Street <br /> Manteca, California <br /> To Whom It May Concern: <br /> This letter is in regards to our groundwater monitoring project at the subject location. <br /> Our firm has been contracted by Archon Acquisition, LLC to monitor groundwater <br /> elevations once a month for one year duration. We understand the information will be <br /> used to design a retention basin for multiple developments in the area. <br /> The piezometers will be constructed to a depth of about 10 feet below groundwater <br /> elevation at the time of construction using 8 inch hollow stem auger. We understand <br /> groundwater depths range from 8 to 10 feet below existing grade in the subject area. <br /> The annular spacing will be filled with sand around the screen, overlain by a bentonite <br /> plug, followed by neat cement grout. <br /> If there are any further questions or concerns, please feel free to contact our office at <br /> (209)948-1345. <br /> Sincerely, <br /> KLEINFELDER WEST, INC. <br /> Adam Killinger, E.I.T. <br /> Project Engineer <br /> AJ K:ra <br /> 85588.G02/ST07R154 ©2007 Kleinfelder <br /> KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />