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• • • • • • SECTION 7.0 • Recommendations • • • With respect to the results of the 2011 annual groundwater monitoring, the 10-year review • soil sampling results,and the additional investigation in the former bagging plant area,the • following recommendations are made: • 1. Install stakes to delineate wells in the Port of Stockton area(i.e.,KP-8S,KP-7S,KP-7D, KP-9S,KP-12S) in an attempt to protect the wells from heavy equipment traffic and • regular grading of the ground surface.A global positioning system unit will be used to • locate buried monitoring wells in future groundwater monitoring events. • 2. Continue phytoremediation and plan to evaluate progress in a 15-year review in 2016. 3. Continue to evaluate and review upcoming monitoring reports from Cal-Farm Supply • facilities. • 4. Re-evaluate cleanup goals for soil and groundwater to assess if they can be reasonably • achieved at the Koppel Stockton Terminal site and whether they are consistent with • current regulations and state of the practice. 5. A root zone model should be created to evaluate the role of irrigation and precipitation • in leaching nitrate and ammonium in soil and to better assess and optimize irrigation • needs.A model may be created by using existing site-specific information and making • assumptions for other parameters;however,additional site information(e.g.,wilting point,field capacity,and soil texture) will also need to be collected to refine the model. • 6. Additional soil sampling should be performed in the former bagging plant area to better • define the extent ammonium in soil and other potential sources. During additional soil • sampling,parameters should be collected to aid in the development of a root zone model and an examination of the extent and depth of tree roots and old root channels • should also be conducted,if possible. • 7. Additional aquifer testing should be performed to provide an indication of the sustained • yield of the shallow aquifer and whether it is of beneficial use for municipal, domestic, or agricultural supply (i.e.,whether it has an average sustained yield of 200 gallons or • more per day). • 8. After additional investigations,as recommended above,possible changes to the existing • remedy or implementation of additional or different technologies in the former bagging plant area may be re-evaluated. • Additional soil sampling would be proposed in a work plan under separate cover.The • results of any additional sampling would be presented in the annual report of the respective • year the work is completed,unless otherwise specified in the work plan. It is anticipated that conclusions of any additional sampling would include whether or not re-evaluation of • the potential remedy for the former bagging plant area is needed and how such re- evaluation,if needed,would be presented (e.g.,in an abbreviated feasibility study). • • • • RDDI112370001(CAH5003.DOCX) 7-1 • • •