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- 6(hevmn <br /> September 17, 1:996 chevron <br /> Chevron.Pipe Line Company <br /> Mr. Michael JAnfurna;Jr. 4000 Executive ParKc ay,Suite 400 <br /> San Ramon,CA 94583 <br /> San Joaquin County`Public Health Services PO.-Box 5059 <br /> Environinental Health Division San Ramon:CA 94583-0959 <br /> P.O. Box 388 <br /> Stockton California <br /> 95201-0388 <br /> Summary of Soil and Groundwater-Assessment <br /> and Recommendation.for.Site Closure <br /> - - ,v .- OCT 0 1 M6. . <br /> Nicholaw Parcel <br /> - San Joaquin County-APS No:238-080-02 ENVIRONMENTAL HEALTH <br /> West Byron Road;Tracy'California PERMITISERACES <br /> Dear Mn Infurna: <br /> Please find attached the Surnmary'of Soil and Groundwater Assessment and Recommendation for <br /> Site Closure, dated September l2,199 6, for the Nicholaw property located in Tracy, CafiforAia. <br /> The subject-document was prepared on behalf bf Chevron Pipe Line Company(CPL) by. <br /> Geomatrix Consultants, Inc. (Geomatnx).and"summarizes the previous environmental work and <br />` recent groundwater monitoring activities at the property. <br /> As described in the-sub'ect re <br /> . ] port, CPL requests that the San Joaquin County Public Health <br /> Services - Environmental Health Divisiori.(SJC-EHgrant closure for the property. The <br /> closure-request is'based ori the following facts: <br /> E <br /> 1. The petroleum hydrocarbons in the subsurface have not degraded groundwater,-thu5 making <br /> this a soil only issue;. <br /> 2. his <br /> hydrocarbons at the site can be historically related to those found on the nearby <br /> Dividend property; <br /> 3. ' A Screening Health Risk.A'ssessment for the Dividend property.found that significant <br /> concentrations of the petroleum hydrocarbons (greater than concentrations at the Nicholaw <br /> property)pose no significant risk.to any future on-site residents;-and <br /> 4. Concentrations of.polycyclic aromatic hydrocarbons (PAHs) detected in soil are less than.at <br /> the Dividend property (oraess than the respective detection'limits) and the U.S. EPA <br /> preliminary remediation guidelines (PBGs) for residential-land use. <br /> Accordingly, we conclude that residual petrol 6u, present.in'soil at the Nicholaw property poses . <br /> no significant health risk to-the environment or future.human receptors. <br /> ecy� b3 <br /> s� - - - ,_ _"'r.r,.- .... x+ .�e.� � `,< sar�a.a:-�-"'M� � -.�tet' �•rms�",�,,,^-�r <br />