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Own <br /> 3. P_ <br /> ro m <br /> Ms. Mary Meays <br /> December 20, 1995 (9347-3011) <br /> • As demonstrated in technical publications (McAlister and Chang, 1994; Rice, et al, 1995), natural <br /> attenuation will reduce the mass, extent, and concentrations of petroleum hydrocarbons in <br /> subsurface soil and ground water. In several documented cases, natural attenuation was as efficient <br /> as engineered remediation processes. Since the petroleum hydrocarbon source has been removed, <br /> natural attenuation will continue to reduce the. petroleum hydrocarbon mass and eventually <br /> The natural attenuation processes include biodegradation, <br /> complete the remediation process. <br /> volatilization, adsorption, dispersion, and dilution. <br /> • The soil and ground water conditions at the site do not pose a threat to public health that warrants <br /> further investigation or remediation based on: (1) the shallow water-bearing zone is not currently <br /> used for domestic consumption; (2) no known domestic/municipal wells are located within 1,104 <br /> feet of the site (RESNA, 1991a); (3) natural attenuation will continue to reduce the residual <br /> petroleum hydrocarbon mass; and, (4) the BTEX concentrations detected in the water samples <br /> collected from the wells at the site in November 1995 do not exceed the MCLs for drinking water. <br /> Case Closure Request <br /> Based on the above, Fugro and Shell respectfully request SJCPHS/EHD's concurrence that no <br /> further remedial, investigative, or monitoring activities are warranted at this site and that the <br /> SJCPHS/EHD grant regulatory case closure. A workplan for remedial system dismantling and vapor <br /> .extraction/monitoring well destruction will be submitted to the SJCPHS/EHD after receipt of <br /> regulatory case closure. <br /> 93473011.BRP .6- <br />