Laserfiche WebLink
10. FILE CLOSURE RATIONAL <br /> Attenuation by natural biodegradation of the remaining <br /> hydrocarbon contaminants should remediate both the soil and the <br /> contaminant plume in the shallow aquifer in a few years. <br /> There appears to be no risk to public health or the groundwater <br /> of the state. <br /> No MTBE was detected in the soil collected during the soil <br /> sampling events. <br /> The reported concentrations of TPHG and BTEX remaining in the <br /> groundwater have decreased significantly over the last 15 months. <br /> The estimated values of TPHG and BTEX remaining in the soil is <br /> 439, 1.2, 0. 76, 3.2 and 0.67 PPM respectively. <br /> The calculated values of TPHG and BTEX remaining in the <br /> groundwater is 0 . 0, 0.0005, 0.0, 0.00008 and 0 .000008 PPM <br /> respectively. The calculated values of MTBE remaining in the <br /> groundwater is 0.0003 PPM. All values are less than one part per <br /> billion. <br /> The calculated gradient historically is generally northerly at <br /> 0.004 ft/ft. No wells are reported to exist north of the subject <br /> site. <br /> JPCA strongly recommends that this site have "File Closure". <br /> A copy of this report is being mailed to Carol Oz, RENS, SJCEHD, <br /> in accordance with the conditions required in the letter to <br /> Edward P. Smith, CFO Piedmont Lumber Co. dated March 17, 1998 <br /> from San Joaquin County. <br /> If you have questions, please call 510-505-0722. <br /> Sincerely, <br /> J hn P. Cummings John N. Alt, CEG <br /> incipal Epigene International <br /> �RED G60��G <br /> cc: Christopher W. Wood, Esq. JOHN NAT <br /> Doug Marstall <br /> N° 1136 <br /> 13 CERTIFIED <br /> EFiGiPiEE q:NG <br /> GEOLCG;ST <br />