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• DDJCZ'f'acy Well Installation Work Plan <br /> 1.0 INTRODUCTION The proposed well location is shown on <br /> Figure 2-1. <br /> 1.1 The purpose of this document is to describe <br /> the well installation activities to be performed in 2.1.2 Monitoring well installation activities <br /> support of remediation efforts at Defense will be performed using procedures as described <br /> Distribution Depot San Jacquin,Tracy Site in the DDJC-Sharpellracy Comprehensive <br /> (DDJC)-Tracy. This well installation effort Field Work Plan(October 1998);field activities <br /> implements recommendations from the Rust will include(with Comprehensive Field Work <br /> Environment and Infrastructure report Summary Plan section numbers indicated): <br /> of Deildrin Data and Recommendations for the <br /> Northwest Corner of the DDJC-Tracy Site and • Location Surveying Requirements(2.0); <br /> Western Annex(dated 19 May 1999), i.e.,to <br /> install and develop a monitoring well in the • Hollow-Stem Auger Drilling(4.2); <br /> western corner of the Annex.Included in this • Groundwater Well Installation and <br /> work plan are well installation, well Development(5.0); <br /> development, and surveying activities. <br /> • General Field Documentation(9.1.10); <br /> 1.2 General procedures, specifications,and <br /> requirements for the work to be performed as • Decontamination Procedures(9.3); <br /> described in this work plan are presented in the <br /> DDJC-Sharpe/Tracy Sites Comprehensive Field • Investigation Derived Wastes (IDW) <br /> Work Plan (October 1998) and will be handling/disposal (10.0); and <br /> performed as set forth in that plan. . Health and Safety Procedures (12.0). <br /> 2.0 FIELD WORK SUMMARY 2,1.3 A summary of drilling and well <br /> 2.1 Well Installation Activities installation activities related to installation of <br /> well LM174AU is presented in the remainder of <br /> 2.1.1 The work to be performed during this this work plan. <br /> field effort at DDJC-Tracy includes the 2.2 Drilling Methods <br /> following(well installation is tentatively <br /> scheduled to begin the week of 29 November): 2.2.1 The proposed monitoring well will be <br /> • Coordination with the San Joaquin County drilled and installed into the Above Upper <br /> Public Health Services,Environmental Horizon, which is estimated to be from 25 to 50 <br /> Health Division; a permit to install feet below ground surface in the northern <br /> monitoring wells north of the DDJC-Tracy portion of the DDJC-Tracy facility. <br /> Depot already exists (Permit No. 018554, <br /> dated 3 March 1999); 2.2.2 Hollow Stem Auger. One 8-to 9-inch <br /> diameter boring for the monitoring well will <br /> • Surface geophysical survey to locate initially be drilled with 4-1/4-inch internal <br /> underground utilities prior to drilling; diameter hollow stem augers to obtain a <br /> continuous core for lithologic logging.Drilling <br /> • Hollow stem auger drilling and continuous and sampling will occur according to the <br /> coring of well borehole; procedures outlined in the Comprehensive Field <br /> Work Plan.Prior to monitoring well <br /> • Installation and development of one Above <br /> construction,the boring will be reamed with <br /> Upper Horizon monitoring well larger diameter augers to provide sufficient <br /> (LM174AU); and annular space for construction. <br /> • Well location surveying of LM174AU. <br /> WELLINSTI 1 October 1999 <br />