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carrying out the activities required in Paragraph 4 of this Order. Within five days of submitting the Proposal, the Respondent may, on request made to the Enforcing Officer's Representative, confer with the"Enforcing Officer regarding the Proposal. Following this opportunity to confer, the Enforcing Officer may modify the Proposal, as he deems reasonable to ascertain the nature and extent of the hazard, and approve the Proposal for implementation. 4. Required Activities. The Proposal shall contain a schedule that includes the following activities: (a) the collection of a minimum of two soil samples from the native soil immediately below each of the USTs proposed to be removed at the Property (Samples shall be collected from each end of each UST.); (b) the collection of a minimum of one soil sample from the native soil immediately below each twenty linear feet of underground piping leading to or from the tanks; (c) the collection of a minimum of one soil sample from the each area of potential contamination, if any, that becomes visible or apparent during field activities; (d) the field screening by headspace analysis using appropriate field equipment of all collected soil samples for the presence of petroleum hydrocarbons and VOCs; (e) the analysis of each collected soil sample by a California-certified laboratory for total petroleum hydrocarbons as stoddard solvent by Modified EPA Method 8015 and VOCs by EPA Method 8260; and (f) the preparation of a report summarizing the removal activities and the laboratory results and including detailed information on the condition of the tanks and piping upon removal, the nature and extent of any contamination detected, the location of such contamination(as illustrated on maps,figures, or tables),the results of all field sampling and laboratory analysis, any previous investigatory or remedial activities with respect to the USTs, and a historical summary of the operation and use of each UST (installation, substances stored in UST, known or suspected releases from UST, closure, etc.). 5. Implementation and Compliance. Upon notification of the Enforcing Officer's approval of the Proposal, Respondent shall implement and comply with the Proposal, as modified, if at all, by the Enforcing Officer. 6. Field Activities. No later than three days before initiation of any field activities under the Proposal, Respondent shall provide to the Enforcing Officer's Representative with written notice of the time and date of such activities. The Enforcing Officer, his Representative, or his designee, shall have the authority to enter and move freely about the Property at all reasonable times for purposes of reviewing the progress of carrying out the terms of this Order; conducting such tests as 2