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.� Ms Carol Oz Project 20805-147 007 <br /> May 5, 1999 <br /> Page 2 <br /> Additional Excavation and Soil Sampling <br /> If warranted, Pinnacle will observe limited overexcavation in the vicinity of the former <br /> product lines, dispensers and UST locations If field evidence indicates hydrocarbons <br /> remain in place, Pinnacle will direct the subcontractor to overexcavate until field <br /> screening data (using a photoionization detector [PID]} of soil samples collected from the <br /> base and sidewalls of the excavated area indicate soil containing relatively high, <br /> concentrations of hydrocarbons have been removed Overexcavation of soil will be <br /> limited to two feet laterally and six feet vertically in the product line areas and will not <br /> extend deeper than a total depth of approximately 18 feet in the UST areas <br /> Please inform us if there is the need to post public notification of these overexcavation <br /> activities as soon as possible as this fob is scheduled to commence in approximately two <br /> weeks from the date of this letter <br /> If you have questions regarding the overexcavation and disposal, please call <br /> • Sincerely, <br /> Pinnacle <br /> eI Coffman Mark Capps, R G 6561 <br /> Project Manager Project Geologist <br /> cc Paul Supple, ARCO Products Company <br /> CP\E 1gRC0121861REP0RT512186P104 DOC-9811sg 1 AK 4e& <br />