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L November 23,2005 <br /> NOA Project Number: E05141A <br /> L 3.0 PAST AND CURRENT SOURCES OF CONTAMINATION <br /> i' 3.1 Research Methods <br /> L NOA employs a standard practice for review of database information. On a street map showing the / <br /> location of the subject property, a circle is drawn one-quarter mile out from the property boundaries, <br /> be and street maps or web-based mapping services are then used to determine address ranges for all streets <br /> within the quarter mile. All agency databases searchable by address are then searched for these address <br /> ranges. <br /> 3.1.1 Regional Water Quality Control Board <br /> NOA reviewed the Leaking Underground Storage Tanks(LUST)list (October 2005), the Water Purveyors <br /> Quarterly Deport on MTBE (October 2005),and the Spills,Leaks,Investigations, and Cleanups(SI IC)list(1" <br /> Quarter 2005) on file with the Central Valley Regional Water Quality Control Board(CVRWQCB)'in <br /> an attempt to determine if there are any files present at that agency which note the unauthorized release <br /> of a tonic or hazardous agent into the environment on the subject property or within a one-quarter mile <br /> radius of the subject property. The subject property was not listed on any of these databases, and no <br /> ►. addresses within one-quarter mile of the subject property were found on the databases. <br /> 3.1.2 San Joaquin County Environmental Health Department <br /> According to Kim Blackwell of the EHD, no files were available for the subject property address of <br /> g 26222 East Mahon Avenue.6 <br /> L <br /> The Underground Storage Tank Site Mitigation List,dated August 5,2005,and the LOP/Non-LOP Sites list, <br /> dated July 20,2004,were reviewed at the EHD on October 18,2005. No listed sites were found within <br /> Y,. one-quarter mile of the subject property. <br /> n The UST Program Facility Inventog by Facility Name,dated April 11,2001,was also searched at the EHD <br /> IL on October 18,2005 for the names of Terpstra,Van Weerdhuizen,and Rocha. No records were found <br /> for the subject property. <br /> j <br /> 6, <br /> L <br /> i <br /> 'California Regional Water Quality Control Board,Sacramento,www.swrcb.ca.gov. <br /> i,. 6Personal Communication,October 20,2005. <br /> 5 <br /> 6. <br /> L <br />