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4.0 SENSITIVE RECEPTOR SURVEY At the request of the property owner, and as directed by Central Valley Water Board, Condor conducted a sensitive receptor survey within a 1,000-foot radius of the Site. The intent of the sensitive receptor survey is to identify potential surface water bodies, wells,parks, schools, child and health care centers, and other potential sensitive receptors that are present within 1,000 feet of the site.A vicinity map is shown on Figure 1 (Appendix A) and a well investigation map showing the area of study is shown on Figure 4 (Appendix A). The survey included contacting the California Department of Water Resources (DWR), California Water Service, the City of Stockton, and property owners; and reviewing available well records, current and historic maps, and other publicly available information. Based on our review of available well records provided by DWR, street and topographic maps, GIS parcel layers through California Online ParcelQuest, current and historic cleanup sites through GeoTracker and EnviroStor, communications with property owners, and inquiries to the City of Stockton and California Water Service, there does not appear to be a risk from the site's groundwater plume to sensitive receptors within the 1,000 feet of the site. Additional information is provided in the following Sections 4.1 through 4.4. 4.1 WELLS WITHIN 1,000 FEET OF THE SITE 4.1.1 Department of Water Resources DWR provided Condor with 220 records for wells located near the site based on township, range, and section, and 22 records for wells potentially located within the 1,000-foot study area. Each of the 22 well records potentially located within 1,000 feet of the site was evaluated in conjunction with Assessor's Parcel Maps, street maps, and historical aerial maps for location relative to the site. Seven of the 22 DWR records were associated with wells within the study area. Five of these seven DWR records were for the destruction of groundwater monitoring wells associated with a former leaking underground storage tank (LUST) site located at 2150 West Charter Way, south of the site. One of the seven DWR records was for the installation of a groundwater monitoring well associated with the former agricultural chemical distribution facility(Oxychem) located at 1904 West Charter Way. One of the seven DWR records was for the installation of an industrial water supply well associated with the Klein Bros. property located to the north and east of the site. A portion of the Klein Bros. property is within the 1,000-foot study radius; therefore, Condor contacted Klein Bros. to obtain additional information regarding the well on their property. Sherry Rita, Controller for Klein Bros. Holdings, Ltd., provided the well location and indicated that the well would only be used for fire suppression. The Klein Bros. well is located approximately 1,150 feet northeast of the site, which is outside of the study area. 4.1.2 Other Sources Condor reviewed information available to the public through GeoTracker, the State Water Resources Control Board's internet-accessible database system, and identified 21 groundwater monitoring wells and three remediation wells (24 wells total)within the study area. These 24 wells are associated with a former agricultural chemical distribution facility operated by Occidental Chemical Company (Oxychem), J.R. Simplot Company, and PureGro Company Oxychem, located at 1904 West Charter Way, approximately 100 feet south of the Site.According to information available on GeoTracker,the groundwater beneath the Oxychem site is contaminated with nitrogen and pesticides and is undergoing phytoremediation to exert