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h'q KLEINFELDER 1 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, Calilurnia (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. Mile 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 ICleinlelder's Work Requisition No. 0909 (20-3978-01.W36), dated September 5, 1999. This wort: was also conducted in accordance with Kleinfelder's Work Requisition No. 070799-1 (20-03978-03.W36) titled "Well Abandonment of MW-7 through MW-12", datedJuly 7, 1999. The objective of the proposed wort: 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 c0nfirrlrltion sampling as recommended by PIIS/EHD during the excavation activities. After excaIVt16 m of Disposal Sites B and C. six monitoring_ wells installed in the vicinity of the two disposal areas were proposed to be abandoned. Between .tune I 1 and 18. 1909 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. Rob rt 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 (CSI, CS4 and CS7) collected at depths ranging Itom 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 i. 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 July 16. 1999. For a summary of the results and comparative regulatory limits and Preliminary Remedial Goals (PRGs) refer to "fable 1 under the "Tables Tab" of this report. On Aily 14. 1999 three 01' the six nmnitorino wells (MW-7. MW-9, and MW-1 l) were abandoned. Monitorim, wells \,I\\/-8. M\\r-10 and MW-12 were unable tai be located at this time due to gradim, operation~ at the site. it is possible that those wells have been destroyed. 20-3975-03.W36/2019766 Pace I uF20 © 1999.K1611'elder. Inc. September 9. 1999