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Work Plan for the Former Two 20,000-Gallon USTs Location at Stockton AASF California Army National Guard of the HydroPunch and advanced to the desired sample depth below.The body of the tool is pulled back,exposing the intake screen to formation groundwater.When groundwater enters the sampler,a small diameter bailer is lowered through the casing and body of the tool into the screened zone for sample collection. However,if the HydroPunch technique is unable to collect groundwater samples, then the following alternate method will apply. 6.7 The CA ARNG Site Investigation QAPP describes that,in addition to the listed quantity of collected samples(soil and groundwater), 10%of the total number of collected samples(soil and groundwater)should be designated and collected as QA/QC samples.Although a total of 40 soil samples will be collected during the site investigation,only 10 soil samples will be analyzed to determine the impacts of petroleum constituents at the site.Thus, 10%of the collected soil samples submitted for analysis equal one soil sample submitted for QA/QC analysis(one field duplicate). Five groundwater samples will collected and submitted for analysis;thus,one groundwater sample will be submitted for QA/QC analysis(one field duplicate).A trip blank,temperature blank,and equipment blank may also be added to the list of QA/QC samples submitted for analysis, if applicable during the field investigation.No deviation from the QAPP has been identified;however, any deviations from the QAPP will be reported in the future investigation report. 6.8 Analytical data and report will be updated and loaded into Geotracker,as required by RWQCB, upon receipt of the data from the laboratory. 6.9 Upon receiving the laboratory data,a report will be prepared describing the results of the soil and groundwater investigation at the former location of the two 20,000-gallon tanks at the Stockton AASF. 6.10 MW Destruction.The three existing MWs(MW-1 through MW-3)may be destroyed(decom- missioned)after it is determined that groundwater beneath the site has been adequately characterized and site closure is granted. If groundwater sampling indicates that groundwater contamination is not present,then the following process will be completed to destroy MW-1 through MW-3. 6.11 The purpose of this WP section is to summarize the activities necessary to decommission three existing MWs that were installed in 1993. The MWs near former UST locations at the CA ARNG AASF,in an area that has had previous investigations and excavation activities.The MW specifications are unavailable at this time and additional research will be required prior to destroying the MWs.Figure 3-1 in Appendix A shows the location of each MW.URS Group,Inc.will perform the MW destruction described in this WP on behalf of the CA ARNG. 6.12 The field activities will be conducted in accordance with San Joaquin County regulations. San Joaquin County PHS-EHD representative Mike Infurna has instructed that each MW will require over-drilling. 6.13 San Joaquin County requires that a permit be obtained prior to borehole drilling and well installation or decommissioning activities.This WP will be submitted along with the permit application to meet the San Joaquin requirements at the time field activities are scheduled. 6.14 If required,decommissioning will be accomplished by over-drilling the well casing from the ground surface to the bottom of each MW. The diameter of the drilled borehole will be the same as the original borehole completed during the well installations. The procedures to be followed are as follows: KAWprocess\00251\CA ARNG\Stockton AASF WP\FINAL\WP text.doc 9 June 2007