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Wright Environmental September 16, 1997 C E 1 V ED " Services, Inc. Project No.1117 7 SEP 23 AN 11; 25 `;.J. CO. PUBLIC WORKS San Joaquin Regional Rail Commission 1810 E. Hazelton Avenue P. O. Box 1810 Stockton, CA 95201 �eV Attn.: Mr. Harry W. Montgomery, Multimodal Stations Cof ma or Re: Request for Proposal - Phase II Hazardous Materials Report for the Stockton Multimodal Station Site Dear Mr. Montgomery, Wright Environmental Services, Inc. is pleased to submit this workplan for the Phase II Hazardous Materials Report. The purpose of the Phase II Assessment is to provide documentation, evaluation and preliminary remediation recommendations for potential hazardous wastes within the portion of the site proposed for purchase. The purchase would be for construction of the Stockton Multimodal Station between Miner Avenue and Market Street in Stockton. The Station would consist of rehabilitating the existing Southern Pacific Railroad Passenger Depot by the San Joaquin Regional Rail Commission (Commission). Background Espana Geotechnical Consulting (Espana) has performed a Phase I Assessment for the Stockton Rail/Multimodal Station(report dated March 14, 1997). The results of that report were that the site had a low potential for impacts from hazardous materials/waste and/or petroleum hydrocarbons. However, Espana recommended that several locations be investigated for near surface soil contamination due to presence or past existence of underground storage tanks. Several sites identified in the Espana report also had the potential to impact groundwater. Consequently, a proposed scope of work to investigate the areas of concern was developed by the Commission. That work was presented in Wright's proposal dated May 14, 1997 which outlined the work tasks. The initial work, a geophysical survey, has been completed in the proposed project area by NORCAL Geophysical Consultants, Inc.. The purpose of the survey was to evaluate the site for potential presence of buried underground fuel storage tanks (USTs), drums, or other contamination sources. Multiple geophysical methods (electromagnetic induction, magnetometry, and ground penetrating radar) were used to evaluate the site for potential contamination sources. The survey identifies areas of geophysical responses where either possible buried objects of fills, metallic objects utilities or shallow ground anomalies were located. The survey located areas in Parcels 1, 2, 5 and 6 where responses indicate potential areas of further study. The geophysical survey indicates that buried debris or objects could be in these areas on Parcel 6 and utilities on Parcels 1 and 2. Ground penetrating radar indicates possible buried objects on Parcel 5. In our opinion, the areas identified as possible buried objects warrant additional study. 4220 Commercial Dr. #5 • Tracy, California 95376 Page t i^% Telephone (209) 833-0758 • Fax (209) 832-5152