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Caoepa's Car Wash (Pacific Avenue) Problem Assessment Report and Corrective Action Plan Page 3 that could be impacted by migration of groundwater from the site . The sensitive receptor survey consisted of inquiries to the California Department of Water Resources (DWR), Central District in Sacramento, California; contacting public water purveyors ; visually inspecting the area; and interviewing residents located in the site vicinity. The results of the sensitive receptor survey follow. The "bier 1 Risk Based Corrective Action Evaluation was conducted using the software RBCA Tool Kit for Chemical Releases, Version 1 .3 . Based ort the well survey described below, groundwater ingestion was not considered a route of exposure. Consequently, the only routes of exposure considered were indoor and outdoor inhalation exposures. The results of the Tier 1 Risk Based Corrective Action Evaluation are in Section 6.2 below . 6. 1 SENSITIVE RECEPTOR SURVEY Well records were cross-referenced with Assessors Parcel Maps and city street maps. This process helped identify records that were estimated to be within the 2,000-foot radius . DWR records typically consist of owner' s name, well location map, address of well, and type of well. Documents provided by the DWR associated with Section, Township, and Range include information pertaining to 16 domestic water wells. A review of DWR records found that one record was illegible or incomplete and could not be identified with present day owners. Based on a review of Assessor Parcel Maps, area reconnaissance, and city street maps, 10 well records contained location data outside of the 2,000-foot radius. Five well records were verified that pertain to locations within the 2,000-foot radius (Figure 17). 6. 1 . 1 Wells Within 2,000 Feet According to DWR records correlated with present day APN and mapping information, five well records pertain to locations within 2,000 feet of the site. • Two wells were destroyed using pea gravel and cement according to the DWR records. • Two wells were identified by permission of the owner or resident during the site reconnaissance (529 Marengo Avenue, and 755 Porter Avenue, as described below) . Neither well was being used at the time of site reconnaissance. • One well was not located (see Gettysburg Place, below). • In addition interviews with local residents indicate that at least seven wells are located within the 2,000-foot search radius that are not documented by DWR records . 529 Marengo Avenue _ The well owner at 529 Marengo Avenue (WI ) had the original well installed in 1951 . He said that lie has been using public water since the mid- 1970s. He also indicated that at least four of his surrounding neighbors also had wells. He indicated that his well is not currently operational due to a faulty electric pump . The pump is still in the well; thus, the well was inaccessible for grab sampling. 755 Porter Avenue The resident at 755 Porter Avenue (W2) allowed us to look for the well, which was located in an outbuilding in back of the residence. According to the resident, they were not using it for potable water or irrigation ; they are using public wafer. This well was installed in 1951 . The resident at 743 Porter Avenue indicated that the well was used for irrigation of an orchard area behind the 755 residence until approximately 1988 . �s $. 1� CONDOR