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A second area of concrete was removed in the area of boring SS -4, where soil sampling results <br />indicated elevated levels of nickel. The initial excavation was 4 foot by 4 foot and five feet deep. <br />Based on verification samples this excavation was extended to the east and south on a few <br />additional dates until verification sample results indicated that no further excavation would be <br />needed. The total depth reached 9 feet in most of the excavation and the approximate size of the <br />excavation was 6.25 by 9.5 feet. The excavation location is shown in Figure 2 and the verifi- <br />cation sample locations, depths, and results are presented in Figure 4. <br />A total of 33 CY of soil were removed from the two excavations and disposed. The manifests for <br />the soil disposal are presented in Appendix 2. <br />All soil samples were analyzed by McCampbell Analytical, Inc., which is certified by the <br />California Department of Health Services (DHS Certification # 1644) to perform the specified <br />analyses. <br />V. CONCLUSION AND RECOMMENDATION <br />Based on the analytical results presented, GRI concludes that the site has been remediated in a <br />manner that has adequately eliminated risk to the environment and humans. GRI recommends that <br />the DTSC consider this site for case closure. <br />VI. DISTRIBUTION <br />Mr. Patrick Movlay <br />Department of Toxic Substances Control <br />Tiered Permitting Corrective Action Branch <br />5796 Corporate Avenue <br />Cypress, CA 90630 <br />Mr. Doug Larsson <br />1239 Heidelberg Way <br />Lodi, CA 95242 <br />VII. LIMITATIONS <br />This report is based upon a specific scope of work. The information, interpretations, <br />conclusions, and recommendations contained in this report have been prepared in accordance <br />with generally accepted professional engineering and geologic practices. Site conditions can vary <br />from those encountered during the time and locations where data are obtained which may result <br />in some degree of uncertainty in the interpretation of these conditions. The services performed <br />for the specific scope of work proposed were completed in a manner consistent with that level of <br />care and skill ordinarily exercised by other professional environmental consultants. Changing <br />conditions may lead to revisions of professional opinions, conclusions, and recommendations. <br />0837 CRpt 6 GRI <br />