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Kennedy/Jenks Consultants <br /> be needed. If a lysimeter continues to not be able to hold a vacuum, further consultation with the <br /> manufacturer may be needed. <br /> 6.2 Installation of Background Lysimeters <br /> Two lysimeters are proposed to be installed on the western portion of the Site, near the main <br /> entrance. One Iysimeter will be installed at a depth of five feet bgs, and the other at a depth of <br /> 10 feet bgs. The proposed location of both Lysimeters is shown on Figure 10. This location is <br /> where Musco collects background soil samples for annual soil testing and performs background <br /> soil moisture monitoring in accordance with WDRs R5-2010-0025. The soil type in the proposed <br /> location is the same as in the vicinity of the Title 27 ponds, Carbona Clay Loam (NCSS 2007). It <br /> is preferable that all background soil and soil moisture data be collected from a single area; and <br /> this proposed location has never received any liquid or solid waste discharge from Site <br /> operations. <br /> 6.2.7 Field Activities <br /> The following field activities will be conducted: pre-installation pressure testing of the lysimeters, <br /> drilling the soil borings and installing the lysimeters. <br /> 6.2.2 Pre-Field Activities <br /> The pre-field activities identified in Section 5.2.1 will be conducted prior to installing additional <br /> lysimeters at the Site. In addition, the following activities specific to the Lysimeters will be <br /> performed: <br /> • Pre-installation pressure testing the Iysimeter, which consists of soaking the Iysimeter in <br /> distilled water for approximately two hours then applying a pressure of approximately <br /> 20 psi. Continuous bubbles will indicate leakage, either from the Iysimeter or from hosing <br /> connections. <br /> 6.2.3 Installation of Suction Lysimeters <br /> Following completion of the pre-field activities, a licensed drilling subcontractor will advance a <br /> boring for the Iysimeter to be installed in. Both soil borings will be advanced to a depth of <br /> 5 feet bgs using a hand auger. A truck-mounted drill rig will be used to advance one boring to a <br /> depth of 10 feet bgs. <br /> Soil samples for logging and soil characterization will be collected at only the target installation <br /> depth (one sample per borehole). The soil cuttings will be lithologically logged using the USCS <br /> (ASTM D-2488-93) system under the direction of a California Professional Geologist who has <br /> expertise in lithologic logging. Field documentation will include a record of the soil encountered <br /> at the target depth for each borehole and total depth of each borehole. General procedures for <br /> sampling and logging are presented in Kennedy/Jenks' Standard Operating Guideline — <br /> Borehole Logging (Appendix C). <br /> Following completion of the borehole, the Iysimeter will be installed. From the bottom of the <br /> borehole, approximately one pound of silica slurry will be added to seat the Iysimeter. The <br /> Iysimeter will be inserted into this slurry, and then additional slurry will be added to completely <br /> Page 18 Work Plan for Improved Detection Monitoring Program <br /> Musco Family Olive Company, Tracy, California <br /> g�gwpWmnyobn2n20ma oo mic wlwoO9 Wft%l _zi dmpbm_dmum Areport text-09-26.doc <br />