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8.0 IDENTIFIED CONTAMINATION SOURCES <br /> The following sources of past, current, on- , and off-site contamination have <br /> been identified as a result of this investigation: -- <br /> Identified Contamination Source Evaluation <br /> 1. The site has been used as the Based on the past use of the Site, <br /> airstrip for a crop dusting facility agricultural chemical residues and <br /> from 1949 through 2001. (Past on- lead have the potential to be present <br /> site) in Site soil and/or groundwater. <br /> Higher concentrations of chemicals <br /> would be anticipated along the sides <br /> of the airstrip, along the western <br /> side of the Site, and in the storage <br /> area (see #4, below). Although <br /> eight locations on the Site have <br /> been tested for agricultural <br /> chemicals (see #2), it does not <br /> appear that any testing for lead has <br /> been conducted. The Site has been <br /> approved for residential <br /> development by the Central Valley <br /> Regional Water Quality Control <br /> Board (see #2). <br /> 2. A Limited Subsurface Investigation In 2012, the Central Valley Regional <br /> Report was prepared by Advanced Water Quality Control Board stated <br /> GeoEnvironmental (AGE) for the that "Trinkle and Boys Flying <br /> Trinkle & Boys property in 2008. Service has satisfactorily completed <br /> The report describes the site investigation and achieved <br /> excavation of 13 soil borings for the applicable remedial action <br /> collection of soil and grab ground standards and objectives. <br /> water samples. Locations B3 Therefore, no further action is <br /> through B6, B8, B9, 1311, and B12 required as of the date of this letter." <br /> were located on the Site of the Amy Terrell of the Central Valley <br /> current investigation. Dicamba was Regional Water Quality Control <br /> detected in sample 136-3 (three feet Board indicated that the Regional <br /> depth) at a concentration of 0.002 Water Board requires sites to be <br /> mg/kg. Dinoseb was detected in cleaned up to residential standards; <br /> samples I36-3, 138-1, and 138-3 at Trinkle & Boys has met that <br /> concentrations of 0.005 mg/kg, requirement based on the results of <br /> 0.039 mg/kg, and 0.029 mg/kg, the assessment, she said (personal <br /> respectively. No ground water communication, March 12, 2015). <br /> samples were collected on the Site <br /> of the current investigation. Those <br /> LOGE 1506 13 <br />