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Work Plan for the <br /> Former Two 20,000-Gallon USTs Location at Stockton AASF <br /> California Army National Guard <br /> • Upon completion of swabbing and bailing,the well will be pumped using a submersible pump. <br /> The wells will be pumped at variable flow rates until excessive drawdown is observed or the <br /> recommended flow rate for that extraction well has been sustained for at least two hours. <br /> • Turbidity,pH,temperature,and specific conductance will be measured throughout the develop- <br /> ment process;measurements will be taken more frequently(e.g.,approximately every 5 minutes) <br /> at the beginning states of development until stabilization has occurred. This frequency will be <br /> determined in the field based on production rate. <br /> 6.20 When each of the following parameters has stabilized during sustainable flow rate and three <br /> consecutive measurements do not differ by more than the limits specified below,well development <br /> will be considered complete.If these limits cannot be achieved,then a new well development method <br /> or approach may be proposed. The well development limits are: <br /> • pH:±0.2 units; <br /> • Specific conductance: ±10.0%;and <br /> • Temperature:±1 degree Celsius. <br /> 6.21 However, if the limits cannot be achieved,then purging will only continue until a maximum of <br /> 10 well casing volumes is reached for each well. <br /> 6.22 Ouarterly Sampling.After the MWs have been redeveloped,the MWs will be scheduled for <br /> quarterly sampling. The analyses to be performed during quarterly sampling will be determined after <br /> the site investigation is completed and the types of petroleum impacts have been determined. To <br /> allow for pertinent laboratories analysis for quarterly sampling,the quarterly MWs sampling protocol <br /> will be based on the site investigation results.Quarterly groundwater sampling will follow the <br /> procedures described in Section 9.1.5 of the CA ARNG QAPP(Radian International,2000a). <br /> 6.23 All work will be coordinated with AASF personnel and adhere to available time between <br /> scheduled flights(coordination based on flight schedule). <br /> 7.0 REFERENCES <br /> Barclays Law Publishers,2000. California Code of Regulations, Title 23. State Water Resources <br /> Control Board.Final.Volume 32. <br /> California Regional Water Quality Control Board,North Coast,San Francisco Bay,and Central <br /> Valley Regions, 1990.Tri-Regional Board Staff Recommendations for Preliminary <br /> Evaluation and Investigations of Underground Tank Sites.August. <br /> California Regional Water Quality Control Board,Central Valley Region,2003.A Compilation of <br /> Water Quality Goals. August. <br /> Hilyard, S.,2007.Personal communication with Scott Hilyard of the California Army National <br /> Guard and Vern Elarth of URS. May. <br /> KAWprocess\00251\CA ARNG\Stockton AASF WP\FINAMP text.doc 11 June 2007 <br />