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• • • • • • SECTION 4.0 • Activities Completed during the Reporting • Period • • • • This section describes activities completed during the current reporting period; groundwater sampling;annual tree survey;10-year evaluation soil sampling;and former • bagging plan investigation soil and groundwater sampling. Operations and maintenance • activities (e.g.,tree pruning and maintaining the irrigation system) are performed on a • regular basis,but are not routinely reported unless the activities could affect the performance of phytoremediation.The objectives of the activities completed during the • reporting period were as follows: • • To collect groundwater samples to evaluate the effectiveness of phytoremediation in • removing nitrogen from groundwater • • To evaluate the overall health of the planting areas • . To collect soil samples to evaluate the effectiveness of phytoremediation in removing • nitrogen from soil • • To collect soil and groundwater samples at the former bagging plant,to evaluate if a • nitrate source area exists around monitoring well KP-3 and to define its extent • 4.1 Groundwater Sampling • • As specified in MRP No.R5-2004-0835 (Water Board,2004b),semiannual groundwater sampling of newly installed wells will be conducted for the first year after well installation,- thus nstallation;thus a semiannual groundwater sampling event was performed on March 4,2011.Depth to • groundwater was measured at all monitoring wells and samples were collected from the • wells installed in 2010 (KP-10S-R and KP-4D).The annual groundwater sampling event was performed on August 9 to 11,in accordance with MRP No.R5-2004-0835 (Water Board, • 2004b).Monitoring wells KP-7S,KP-7D,and KP-9S were not located during the annual • event because they were covered with 2 to 9 inches of road base,despite searching for them • using two metal detectors.Monitoring well KP-8S was not able to be accessed because it was behind a locked gate.These four wells are located west of the site on the property • owned by the Port of Stockton.During the next sampling event,survey stakes will be • considered for the monitoring wells located in the Port of Stockton area in an attempt to protect them from heavy equipment traffic and regular grading of the ground surface. In • addition,a global positioning system unit may be used to aid in locating monitoring wells • that are covered by road base. • As part of the annual groundwater sampling event,monitoring well KP-3 was video • surveyed;the video survey is presented in Appendix F. The results of the semiannual and annual groundwater monitoring events are presented in Section 5.The semiannual and • annual groundwater field reports are presented in Appendix C. • • RDD1112370001(CAH5003.DOCx) 4-1 • • •