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3.0 PREVIOUS SITE ASSESSMENTIINVESTIGATIONAC W77ES <br /> 3.1 PHASE ENVIRONMENTAL REVIEW <br /> In January 1997,HLA,Inc., completed a Phase I environmental review of <br /> the then TRI Delta Fertilizer,Inc.,facility. The review described Site <br /> conditions and contained a discussion of adjacent properties. <br /> 3.2 PHASE I ENVIRONMENTAL SITE ASSESSMENT <br /> In August 1997, Environ completed a Phase I ESA with limited soil and <br /> groundwater sampling. Three soil borings (SB-1,SB-2, and SB-3,shown <br /> on Figure 2) were advanced to approximately 15 feet bgs in three storm <br /> water drainage ponds. Soil and groundwater samples were collected and <br /> analyzed for total petroleum hydrocarbons (TPH),herbicides,metals,total <br /> dissolved solids,and anions. A process water well (EW-1) installed in <br /> 1986 was also sampled and analyzed for the same constituents. <br /> Detections were reported for the above constituents in soil and <br /> groundwater. Specifically,the nitrate (nitrogen) concentration at 1,250 <br /> milligrams per liter(mg/L) and sulfate concentration at 3,200 mg/L <br /> exceeded their risk-based human health standards of 10 mg/L and 250 <br /> mg/L,respectively. Environ recommended that future investigations <br /> should attempt to confirm if groundwater beneath the Site had been <br /> impacted by fertilizer operations. <br /> 3.3 PHASE H ENVIRONMENTAL SITE ASSESSMENT <br /> In March 2005,ERM completed a Phase II ESA of the Site. Four soil <br /> borings (SB-4,SB-5, SB-6, and SB-7, shown on Figure 2) were advanced to <br /> approximately 12 feet bgs. The soil borings were sampled at three evenly <br /> spaced intervals (0.5 feet,3.0 feet, and 3.5 feet bgs) in the vadose zone <br /> using a standard 4-foot-long sampler. Groundwater was encountered at <br /> approximately 4 to 6 feet bgs in each boring. Wells were installed at each <br /> soil boring to a depth of 5 feet. Three shallower soil borings (SS-1,SS-2, <br /> and SS-3) were advanced to 1.5 feet bgs near areas of heavy truck traffic. <br /> Soil samples were analyzed for TPH, organochlorine pesticides, <br /> organophosphorus pesticides,chlorinated herbicides, and inorganics <br /> (ammonia,chloride,nitrate, sulfate, and pH). Groundwater samples were <br /> analyzed for TPH,volatile organic compounds (VOCs),chlorinated <br /> herbicides,total metals, and inorganics (ammonia,chloride,nitrate, <br /> ERM 4 LFSCO,INC./W67MM-Novm 2p7 <br />