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San Joaquin County EHD <br /> December 7, 2005 <br /> Page 5 of 5 <br /> Petroleum Hydrocarbons: TRPH was detected at low levels in one of the soil samples collected <br /> beneath a leach line removed from the septic system, but is not considered significant. In addition, <br /> TRPH and TPHd were detected at elevated levels in the composited sample collected from the <br /> dried sludge. As we discussed in a recent telephone conversation the petroleum hydrocarbons in <br /> the sludge sample may be a result of the sludge coming in contact with the asphalt surface during <br /> drying and from residual oil/grease in the septic tank from normal washing of hands and clothing. <br /> None of the typical petroleum hydrocarbon constituents, such as BTEX,were detected in the sludge <br /> sample. <br /> RECOMMENDATIONS <br /> As we discussed in a recent telephone conversation and based upon the absence of VOCs in the <br /> dried sludge sample, Ground Zero requests authorization to dispose of the dried sludge by <br /> spreading on the access road in a low-traffic area of the site. After the disposal is completed, <br /> Ground Zero requests that EHD issue a closure letter removing the site from the local, State, and <br /> Federal UIC program <br /> Please contact John Lane (209-838-9888) at your earliest convenience if you have any questions or <br /> comments regarding this report. <br /> Sincerely, <br /> Ground Zero Analysis, Inc. � �D Gtr®�� <br /> ' JOHV P. <br /> LANE <br /> John P. Lane, PG No. 6795 <br /> CA Registered Geologist No. 6795 . <br /> Attachments <br /> G:\GROUNDZE\Berberian\sum closure.doc <br />