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1 <br /> WHF to Berry Seed and Feed on February 10, 1990 A copy of the <br /> report is contained as Appendix A to this report. <br /> ma Tank P moval.MM <br /> In July 1990, the five underground storage tanks were removed by <br /> SEMCO of Modesto, California, under contract to WHF Ten soil <br /> samples were collected during the removal of the underground fuel <br /> tanks, one at each end of the five tank excavations These samples <br /> were analyzed for TPH as gasoline and diesel, as well as BTEX A <br /> concentration of 900 mg/kg of diesel was detected in the sample <br /> collected near the south end of the 10,000-gallon diesel tank <br /> referenced as tank #2 in Table 1-1. A concentration of 3,000 mg/kg of <br /> diesel was detected near the south end of the 10,000-gallon diesel tank <br />' referenced as tank #3 in Table 1-1 Gasoline and diesel were detected <br /> in the soil samples collected near the north and south ends of the <br /> 5,000-gallon diesel tank referenced as tank # 4 in Table 1-1. Gasoline <br />' and diesel were also detected in the soil sample collected near the <br /> west end of the 5,000-gallon diesel tank referenced as tank #5 in Table <br /> 1-1. The tank removal procedures and analytical results are <br />' presented in the report entitled "Re-excavation Work Plan", which <br /> was prepared by WHF and submitted on July 24, 1990 A copy of the <br /> workplan as included in Appendix B to this report <br /> PlAamei <br /> x n 3yqrkplan, <br />' During July 1990, in response to the detection of petroleum <br /> hydrocarbons during the removal of the underground storage tanks, <br /> WHF proposed to excavate soil in this area to a depth of 20 feet It was <br /> anticipated that approximately 2,100 cubic yards of soil would be <br /> excavated. This proposal, the "Re-excavation Workplan," was <br /> submitted by WHF to San Joaquin County during July 1990 and was <br />' subsequently approved This workplan is contained in Appendix B to <br /> this report. Approximately 2,500 cubic yards of soil were excavated <br /> from the area and stockpiled on-site An Addendum to the "Re- <br /> excavation Workplan" was submitted by WHF to San Joaquin County <br /> on September 12, 1990 and was also subsequently approved <br /> 1Slot Sampling of Excavatio-ri.ERM—Mest <br /> During October 1990, ERM-West recommended that an investigation <br /> be done to determine the extent of soil contamination prior to <br /> proceeding further with excavation of contaminated soil. On October <br /> 11, 1990, ERM-West performed soil sampling around the excavation <br /> This sampling was performed by excavating slots into the walls of the <br /> existing excavation using a backhoe. This methodology was used <br /> following an excavation workplan prepared by WHF that had already <br />' 1-3 <br />