SITE INFORMATION AND CORRESPONDENCE

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Gene Gabbard Inc. - 3 - 9 July 2009 640 N. EI Dorado St., Stockt* Y The Site utilizes public water for the business. The State website GeoTracker states that no public supply wells exist within 2,000' of the Site. Private wells are not permitted in downtown Stockton, and none are known to exist near the Site. The nearest surface water body, McLeod Lake (an extension of the Stockton Deep Water Channel) is located two blocks from the Site. A minimal amount of soil was removed during the UST removal, due to the location of the waste oil tank (within the building service bay). The estimate for the mass of petroleum hydrocarbons removed by skimming free product from MW-3 (UST pit) is 10 gallons. The remaining mass in groundwater is estimated as less than one gallon. Staff concurs that the data show natural attenuation is occurring in groundwater, that the groundwater plume (with the exception of the offsite-sourced PCE plume) is stable, contaminant concentrations are declining, and will reach Water Quality Goals in ten years. Due to the location of the former UST in the service bay of the building, there are minimal threats from direct exposure to residual soil contamination and from vapor intrusion to occupants of the business, and with City permitting protocols, minimal risk to future construction workers. There are no wells located within 2,000 feet of the Site, including water supply wells (domestic or municipal); and the surface water body (McLeod Lake), while less than 2000' to the southwest of the site, is located upgradient of groundwater flow direction. The required public participation comment period was completed on 20 February 2009 without any adverse comments. Monitoring wells were properly abandoned on 25 June 2009. Staff recommends consideration of a low risk Site closure with no further action required. Enclosures: Figure 1 Site Location Figure 2 Wells Locations Aerial Photograph