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GEOSYNTEC CONSULTANTS <br /> Ms. Amy Terrell <br /> 25 August 2003 <br /> Page 2 <br /> BACKGROUND ' <br /> The WFS Vernalis facility is an agricultural chemical retail facility. Site operations <br /> include storing, blending, and distributing bulk liquid and dry fertilizers. Smaller, pre- <br /> packaged containers of fertilizers and pesticides are also stored and sold at the site. A <br /> series of site investigations and remedial actions have been performed at the site since <br /> 1991, including two investigations in 1996 targeted at the former tank farm area. <br /> As part of a risk-based corrective action (RBCA) site assessment performed at the <br /> site in 19962, 35 soil samples were collected from ten locations; several of the samples <br /> were collected from the area of the old tank farm. Most of the soil samples were field <br /> tested for nitrate,with a few of the samples also analyzed by an analytical laboratory for <br /> nitrate as nitrogen (EPA Method 300.0) and ammonia as nitrogen (EPA Method 350.3). <br /> Results for both the field tests and the analytical laboratory indicated a wide range of <br /> concentrations of both nitrate and ammonia that substantially decreased with depth. <br /> The soil analytical results summary table and figure indicating sample locations from <br /> the RBCA report are included in Attachment A. <br /> Following the RBCA investigation, one foot of soil, about 300 cubic yards, was- <br /> excavated from the 150 ft by 50 ft former tank farm area and was disposed of offsite. <br /> GeoSyntec collected 18 soil samples from the old tank farm area following the <br /> excavation, including an area where WFS planned to build new dry fertilizer bins. The <br /> 18 soil samples were combined into six three-point composite samples that were <br /> analyzed for nitrate as nitrogen (EPA Method 300.0) and ammonia as nitrogen (EPA <br /> Method 350.3). Results of the analyses indicated nitrate concentrations ranging from <br /> 271 milligrams per kilogram (mg/kg) to 1,038 mg/kg and ammonia concentrations <br /> ranging from 360 mg/kg to 5,800 mg/kg. <br /> . Following the excavation, the area was back-filled and a portion of the area was <br /> paved with concrete for construction of the new dry fertilizer bins. The soil analytical <br /> 2 GeoSyntec Consultants, 1996."Risk Based Corrective Action Summary Report,Western Farm Service, <br /> Inc.,Vernalis,California facility,"April 1996. <br /> P:\PRJ2003REM\WFS\VER\Soil Plan 2003\RAP-Soil 8-25.doc <br /> FWYC AM MCYQ.AelE <br />