ARCHIVED REPORTS_REMEDIAL INVESTIGATION REPORT 2000

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1 .0 INTRODUCTION/SITE HISTORY • This report is being submitted in response to a request by the City of Stockton Redevelopment Agency to perform a subsurface site assessment of a portion of the Banner Island property ( Figure 1 ) . Banner Island was a delta island that was reclaimed in the twenties. It is unknown what materials were utilized for reclamtation, however, they probably included some dredge spoils. Also it has been reported that solid waste was used as part of the fill (Jim Escobar, City of Stockton Public Works, personal communication) . The property under investigation which is referred to herein as Banner Island, represents part of the former island which was occupied by a ship building facility from at least the thirties until the site was cleared in the seventies . Banner Island is presently an undeveloped piece of property located between Lindsay Street and the Deep Water Channel in Stockton. The site is presently fenced and unpaved. An esplanade planted with grass lies between the subject property and the Deep Water Channel (Figure 2 ) . The site _layout of the former ship building facility is also shown on Figure 2. The property west of the site was formerly a steel fabrication facility which also did ship building work as well as manufacturing culverts and other products. The property is presently occupied by an office building and parking lot. To the north of the subject property across W. Lindsay Street, several commercial businesses have operated over the years including several auto repair shops. An automobile retail business is currently located directly across Lindsay Street from the site. 2.0 HYDROGEOLOGIC CONDITIONS The site is situated on level terrain comprised of Quaternary-Recent alluvial sediments and fill materials. The fill materials have reportedly included municipal solid waste as well as dredged material from the channel. Glass, metal and wood were noted in a number of the shallow borings. Depth to water is approximately 20 feet below grade based on the San Joaquin Flood Control and Water Conservation District data. Regional groundwater (unconfined) generally flows to the west parallel to the nearby Stockton Deep Water Channel. However, the effects of pumping and river stage make the prediction of flow in the shallowest water bearing zone difficult. Several domestic/industrial wells are located within a one-half mile radius of the property ( Figure 1 ) . These wells are completed at depths greater than 200 feet. 1