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DDJC-Sharpe Groundwater Mon&g Well Installation Wc rk Plan 1.0 INTRODUCTION (TCE)plume and provide water level data to better define the North Balloon capture zc.1es 1.1 The purpose of this work plan is to describe (URS,2003b).The four-well cluster will i erify a groundwater monitoring well installation the western extent of the volatile organic(om- effort to be conducted west of the Defense pound(VOC)plumes in four depth interys; Distribution Depot San Joaquin California— provide guard wells between extraction wells Sharpe Site(DDJC-Sharpe).A cluster of four and PWO44 and PWO47 privately owned I otable monitoring wells,MW526A,MW526B, water wells;and provide additional water evels MW526C,and MW526D,will be installed as to define flow directions and capture zone part of DDJC's ongoing groundwater remedia- where a data gap now exists (URS,2001). tion efforts to provide effective monitoring of the groundwater plumes.Figure 1-1 shows the 1.4 The location of the MW526 cluster i location of the MW526 cluster. The wells will shown on Figure 1-1.The well design spe ifica- be located on private property east of Harlan tions for the proposed MW526 well cluster are Road,which requires a property easement. provided in Table 1-1 and are based on th specifications presented in the DDRW-Sh upe 1.2 The proposed MW526 well cluster was Well Installation Work Plan (Radian Co ra- originally recommended for installation on the tion, 1996b).A diagram of a typical grou - San Lorenzo Lumber property in the 1995 water well multiple completion design is s lown DDRW-Sharpe Federal Facilities Agreement on Figure 1-2.Planned well installation Annual Progress Report(Radian Corporation, activities are discussed in Sections 2.0,3.(,4.0, 1996a),but after repeated attempts,a lease and 5.0. A more complete discussion of well agreement could not be obtained with the construction procedures is presented in th property owner. In 2002, an alternate location DDJC-Sharpe/Tracy Comprehensive Fiel was selected approximately 600 feet northwest Work Plan Field Procedures(URS, 2004a).The of the original location on the Lathrop Sands well installation is tentatively scheduled f r July Mobile Home Park property. However, an 2004 depending on the acquisition of the r ght- easement agreement could not be obtained on of-entry agreement and a county well this property.In 2003,a third proposed location, installation permit. Costs associated with his approximately 100 feet to the south of the field effort are consistent with those prese ited location on Lathrop Sands property,was chosen in the Task Order 07 budget estimates. (Figure 1-1)(URS,2003a);however,an ease- ment on this property was found to be impracti- 2.0 WELL INSTALLATION cal because the property will be undergoing ACTIVITIES construction of a commercial business. Recently,it was discovered that the San 2.1 Pre-Well Installation Activi ies Lorenzo Lumber property(original proposed location)has undergone a property ownership Before any drilling is initiated,a well inst Ila- change.The new property owners were con- tion permit will be obtained from San Joa uin tacted,and have agreed to allow the government County Environmental Health Departmen , as to install the wells on their property.A right-of- well as clearance of aboveground and entry agreement is currently being executed by belowground utility hazards at all of the the United States Army Corps of Engineers, locations. Sacramento District—Real Estate(CESPK-RE) to allow the wells to be installed prior to the 2.2 Field Documentation permanent easement acquisition. 2.2.1 The URS field geologist will maintain an 1.3 MW526A,MW526B,MW526C,and accurate log for all the borings.At a minimum, MW526D will be installed to monitor potential the log shall include: off-installation migration of the trichloroethene KAWpro m\00363\sharpe\MW 1nsta11atirmrF1NALN4W526.dne 1 J ne 2004