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CONESTO3A-ROVERS ' <br /> &ASSOCIATES <br /> 15. Rationale why conditions remaining at the, will not adversely impact water.quality, <br /> health, or other-beneficial uses;.and:. <br /> • Separate-phase hydrocarbons have never been present beneath the site or in-site wells. <br /> • TPHg, BTEX, and fuel oxygenate concentrations-have been low to non-detect in all .soil <br /> samples collected at the site since the overexcavation activitics in 1990. <br /> • TPHg and BTEX concentrations have been"low. to;non-detect in groundwater monitoring <br /> samples collected at the site. <br /> • MTBE in groundwater is defined both vertically and horizontally to the extent feasible. <br /> • MTBE concentrations in groundwater show a decreasing concentration trend; and appear to- <br /> be <br /> obe naturally attenuating. - <br /> 16. WET or TCLP results <br /> ...Not available. <br /> CLOSING <br /> Based on CRA's review of the site condition, the site satisfies the criteria for a low-risk fuel site. <br /> On behalf of Shell, CRA respectfully requests case closure. .Thank you for your consideration in <br /> = this matter. If you have any questions regarding the contents of this document, please call Joe <br /> Neely at(707) 933-2361. <br /> Sincerely, <br /> Conestoga-Rovers &Associates <br /> n - 1A1. <br /> Joe W.Neely,PG <br /> 6"7 <br /> 0813 11 <br /> Worldwide Engineering,Environmental,Construction,and IT Services <br />