SITE INFORMATION AND CORRESPONDENCE

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Sent By BASELINE; 510 420 1707; Nov-9-99 16:26; Page 12129 To the west: • An ARCO gasoline station was located west of the property until 1998-99. The type of hazardous materials and/or hazardous wastes, quantities stored, volumes of waste disposed of,and management practices at these off-site locations are unknown;however,hazardous materials and wastes used by auto repair,machine shops,gasoline stations,andprinting shops would likely include petroleum products,solvents, other vehicle fluids (auto repair, gasoline stations,and machine shops only),and metals as found in dyes (printing shops only). Insecticide manufacturing and a fertilizer company would likely have used petroleum products, metals, solvents,pesticides, and herbicides. It is likely that hazardous materials and wastes associated with off-site land uses were stored in containers as well as above-or underground storage tanks. Any releases associated with these off-site land uses could have potentially impacted groundwater at the Weber Block, if these sites were located upgradient of the site. The forTner ARCO site has been identified as upgradient of the site,based on water level measurements collected at this site; the data generally indicate an easterly to southeasterly groundwater flow direction(SECOR, 1999; Langevin, 1999). It is unknown if releases from other off-site land uses have contributed to subsurface contamination at the Weber Block property. PROPOSED SITE REDEVELOPMENT PLANS AND LAND USES In 1995,the Stockton City Council created a W atertront Revival Task Force and charged it with the task of developing an updated strategy for development of the waterfront area. In 1996, the City Council adopted and approved the Task Force's Waterfront Revival used Action Flan,which laid out a framework to guide future development of the waterfront. Proposed redevelopment called for an opening in the water channel "to create a new `Water Square,' an attractive urban %pace with fountains and water cascades(which)would serve the critical function of aerating the channel water, thereby improving its water quality by limiting the growth of algae"(HDR Engineering,Inc., 1999). The proposed redevelopment of the property, to be implemented following the completion of the PEA process, is briefly summarized below and shown on Figurc 5: • Demolish and remove the existing parking structure over the Stockton Channel and remove the timber support structure of piles` and beams, (A sheet pile seawall would be constructed downstream of the Center Street Bridge to dewater the Weber Block area during construction and would be cut down following construction to an elevation that would allow;the water' pumped into Weber Block to feed the water fountain to flow back into the main channel). • Excavate the plaza area to four feet below street level. Remove the top four feet of the existing concrete seawall that rings the channel. The seawall would be stabilized by using riprap and by grouting voids tinder the seawall, and would be cleaned and refaced. 'The piles would he brakcn off at streambed elevation. 97369i tk.p",wpJ-L 119,+99