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<br /> <br /> <br />EKI B90047.00 Page 11 Former Pilkington North America Site <br /> Lathrop, California <br />are provided in Appendix J. The encountered waste material thickness in the North and South <br />Waste Cells ranged between 8 and 13 feet (AGE, 2016). <br /> <br />If field observations indicate the presence of a previously unknown waste pit, the RWQCB will <br />be notified, and the material will be sampled and tested to determine if it exceeds screening <br />levels. If the test results exceed screening levels the material will be excavated and managed in <br />accordance with procedures described in Section 6.0 of the EMMP (Appendix C). If material <br />qualifies for on-Site reuse, as outlined in the EMMP (Section 6.6), these materials will be reused <br />at the Site, and the reuse location will be documented. <br /> <br />If a previously unknown waste pit is encountered, a samples of the materials in the waste pit <br />will be collected and analyzed for: <br /> <br />o Title 22 Metals <br />o Dioxin and furans <br />o PCBs <br />o TPH-g/d/mo <br />o SVOCs <br />o PAHs <br />o VOCs <br /> <br />If the applicable soil screening levels listed in Section 1.4 are exceeded for the area where the <br />wastes are present, then the RWQCB will be notified and the extent of the impacted soil will be <br />evaluated. <br /> <br />If it is determined that the material must be excavated, remedial excavation will proceed until: <br /> <br />• analysis of confirmation soil samples for relevant COCs indicates that applicable soil <br />screening levels are met, or <br />• the excavation reaches the top of the groundwater table, approximately 12 ft bgs. <br /> <br />Confirmation samples will be collected from in-place soils at the limits of a remediation <br />excavation as follows: <br /> <br />• Discrete sidewall samples will be collected from freshly exposed soil approximately one - <br />half of the excavation depth at an interval of approximately one sample per 50 linear <br />feet of sidewall excavation face. <br />• Bottom confirmation samples will be collected from excavation bottoms at discrete <br />locations on approximately 50-foot centers for areas greater than approximately 2,500 <br />square feet. <br />• A minimum of one bottom sample and one sidewall sample per excavation face will be <br />collected from each excavation. <br />