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August 24, 1998 and transported under hazardous waste manifest to Richmond, <br />California where each were properly destroyed by Ecology Control Industries, Incorporated. <br />(7) Corrective action taken to date includes the removal of backfill soil suspected to be <br />hydrocarbon -impacted from the fuel tankpit and product piping trenches. The volume of soil <br />stockpiled from the fuel tankpit was estimated as 260 cubic yards. The volume of soil <br />stockpiled from the piping trenches was estimated as 13 cubic yards. Stockpile soil samples <br />were collected on August 24, 1998 by a representative of Gettler-Ryan, Inc. (Haig Kevork) to <br />characterize hydrocarbon concentrations for offsite disposal purposes and/or reuse onsite. <br />Based on field observations during UST closure activities, further excavation was performed <br />beneath the eastern end of the middle fuel UST in attempts to further define the vertical extent <br />of hydrocarbon contamination in soil. The volume of soil generated by this excavation was <br />estimated as 45 cubic yards. The soil was stockpiled on visquene and was sampled by a <br />representative of Gettler-Ryan, Inc. on August 24, 1998. The further investigation by <br />excavation was performed according to procedures described in Gettler-Ryan's Contingency <br />Workplan For Excavation dated July 16, 1998. <br />Prior to backfilling any excavation, conductor casing will be placed above any suspect soil <br />sample location such that further vertical definition can be performed without disrupting the <br />engineered fill. A separate workplan detailing drilling and sampling procedures will be <br />submitted for prior approval. <br />A final report documenting all UST removal activities, excavations, soil stockpile <br />characterization, and disposal will be submitted to San Joaquin County Public Health <br />Services within 45 days of completing such activities. <br />(8) The method of cleanup implemented to date has been limited to the removal of hydrocarbon - <br />impacted backfill that was associated with the former fuel tankpit and piping trench areas. <br />Further cleanup activities will be determined upon review of subsequent soil analytical results. <br />(9) A total of approximately 345 cubic yards of soil were stockpiled at the subject site. These <br />soils were generated during the removal of all UST's and piping. All stockpiled soil was <br />sampled by Gettler-Ryan according to protocol required by San Joaquin County PHS-EHD for <br />consideration of reuse onsite. Any stockpiled soil deemed unsuitable for reuse onsite will be <br />transported to BFI Vasco Road Landfill in Livermore, California. Copies of all soil disposal <br />manifests will be submitted as soon as they are available. <br />(10) N/A. All underground fuel storage and delivery equipment was closed and removed on August <br />24, 1998. <br />(11) N/A. All underground fuel storage and delivery equipment was closed and removed on August <br />24, 1998. <br />2652 (d) Chevron will comply with all reporting requirements specified within this subsection. <br />(e) Chevron will conduct initial abatement, site characterization, and additional corrective <br />action as specified within this subsection, within sections 2653, 2654, and within Article 11. <br />(f) Chevron understands the language within this subsection. <br />Hopefully, you will find these information to be complete. If further information is required, please contact <br />me directly at (925) 842-8695. <br />Sincerely, <br />16 <br />Brett L. Hunter <br />Environmental Engineer <br />Site Assessment and Remediation <br />