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1-1 I�1 a Ab KLEINFELDER I EXECUTIVE SUMMARY This is a closure report which contains Kleinfelder's observations of excavation activities. and monitoring well abandonment in the vicinity of Disposal Sites B and C at the Spreckels Sugar Plant No. 2 in Manteca, California (see Plate 3). Additionally, this report details soil and groundwater sampling conducted during excavation of the two disposal sites and the resulting analytical results. Mr. Mike Atherton of Atherton Kirk Development Company, retained Kleinfelder to conduct these activities. The work was conducted in accordance with Kleinfelder's "Proposed/Workplan, Removal of Debris Disposal Areas...." (dated September 5, 1997) in accordance with Kleinfelder's Work Requisition No. 0909 (20-3978-01.W36), dated September 5, 1999. This work was also conducted in accordance with Kleinfelder's Work Requisition No. 070799-1 (20-03978-03.W36) titled "Well Abandonment of MW -7 through wMW -12", dated July 7, 1999. The objective of the proposed work was to remove buried debris from Disposal Sites B and C so that closure could be obtained and the disposal areas would not interfere with future development of the site and to conduct confirmation sampling as recommended by PHS/EHD during the excavation activities. After excavation of Disposal Sites B and C. six monitoring wells installed in the vicinity of the two disposal areas were proposed to be abandoned. Between June l 1 and 18, 1999 Disposal Sites B and C were excavated. Two groundwater samples and seven confirmatory soil samples were collected during these excavation activities under the direction of Mr. Robert McCollum of the San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD) and were submitted under chain -of - custody procedures to a state certified laboratory. Subsequently three soil samples (CS1, CS4 and CS7) collected at depths ranging from six to twelve feet bgs and both water samples, CSW (6/16/99 and 6/20/99) were analyzed for selected analytes listed in Section 5. Soil samples CS 1 and CS4 were collected from Disposal Area C. Soil sample CS7 and groundwater samples CSW (6/16/99 and 6/20/99) were collected from Disposal Site B. Only trace concentrations of some constituents were present. Based on the concentrations detected, Mr. McCollum gave approval to backfill the excavations on .luly 16, 1999. For a summary of the results and comparative regulatory limits and Preliminary Remedial Goals (PRGs) refer to Table 1 under the "Tables Tab" of this report. On July 14. 1999 three of the six monitoring wells (MW -7, MW -9, and MW -11) were abandoned. Monitoring wells MW -8, MW -10 and MW -12 were unable to be located at this time due to grading operations at the site. It is possible that those wells have been destroyed. < 20-3978-03.W 3GI_(11 )7GG Page I of 20 September 9, 1999 © 1999. Kleinfelder. Inc.