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1 1 w <br /> r I'\ <br /> Wright <br /> Environmental <br /> Services, Inc. <br /> November 10, 1997 Construction • Engineering • Remediation <br /> Project No. 1117 <br /> San Joaquin Regional Rail Commission <br /> 1810 E. Hazelton Avenue <br /> P. O. Box 1810 <br /> Stockton, CA 95201 <br /> Attn.: Mr. Harry W. Montgomery,Multimodal Stations Coordinator <br /> Re: Phase H Hazardous Materials Report, Parcels S and 6, for <br /> the Stockton Multimodal Station Site <br /> Dear Mr. Montgomery, <br /> Wright Environmental Services, Inc. is pleased to submit the Phase H Hazardous Materials <br /> Report. The purpose of the Phase II Assessment is to provide documentation, evaluation <br /> and preliminary remediation recommendations for potential hazardous wastes within the <br /> portion of the site proposed for purchase. The Stockton Multimodal Station between <br /> Miner Avenue and Market Street in Stockton is proposed for construction on this site by the <br /> San Joaquin Regional Rail Commission (Commission). <br /> Background <br /> Espana Geotechnical Consulting (Espana) has performed a Phase I Assessment for the <br /> Stockton Rail/Multimodal Station (report dated March 14, 1997). The results of that report <br /> were that the site had a low potential for impacts from hazardous materials/waste and/or <br /> petroleum hydrocarbons. However, Espana recommended that several locations be <br /> investigated for near surface soil contamination due to presence or past existence of <br /> underground storage tanks. Several sites identified in the Espana report also had the <br /> potential to impact site soil and groundwater. Consequently, a proposed scope of work to <br /> investigate the areas of concern was developed by the Commission presented in Wright's <br /> proposal dated May 14, 1997. <br /> The initial work, a geophysical survey, has been completed in the proposed project area by <br /> NORCAL Geophysical Consultants, Inc. The purpose of the survey was to evaluate the <br /> site for potential presence of buried underground fuel storage tanks (USTs), drums, or <br /> other contamination sources. Multiple geophysical methods (electromagnetic induction, <br /> magnetometry, and ground penetrating radar) were used to evaluate the site for potential <br /> contamination sources. The survey identifies areas of geophysical responses where either <br /> possible buried objects of fills, metallic objects utilities or shallow ground anomalies were <br /> located. The survey located areas in Parcels 1, 2, 5 and 6 where responses indicate <br /> potential areas of further study. Access to Parcels 1 and 2 has not yet been secured so <br /> work has been postponed for these parcels. <br /> The geophysical survey indicates that buried debris or objects could be in these areas on <br /> Parcel 6 and utilities on Parcels 1 and 2. Ground penetrating radar indicates possible <br /> buried objects on Parcel 5. In our opinion, the areas identified as possible buried objects <br /> warranted additional study. This report presents the work completed on Parcels 5 and 6. <br /> 4220 Commercial Dr., Suite 5 • Tracy, CA 95376 <br /> 209.833.0758 . Fax 209.832.5152 Page 1 iA, <br /> Wright@inreach.com Lic. 4651501 A-BHa-.Wat <br />