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GEOSYNTEC CONSULTANTS <br /> ' Ms. Amy Terrell <br /> 31 January 2005 <br /> Page 4 <br /> ' • Vapam (EPA Method 131 for MITC, the active degradation product of metam- <br /> sodium); <br /> • Total petroleum hydrocarbons (EPA Method 8015-modified); and <br /> • Metals by EPA Method 6010B. <br /> Results of the soil investigation are shown in Figure 2. Of note, elevated ammonia <br /> was detected in all samples from ST03, located adjacent to and downslope of the <br /> ' vapam tank, and at depth in STO1 near the former liquid tank farm. Nitrate is present <br /> in soils across the site. 1,2-DCP and 1,2,3-TCP were not detected in any of the soil <br /> samples. Only a few pesticide analytes were detected at generally low concentrations <br /> ' (i.e. less than 0.5 mg/kg). <br /> Groundwater Investigations <br /> ' In January 1999 and November 1999 grab groundwater investigations were <br /> conducted in the operations areas. In the two sample events, grab groundwater samples <br /> were collected from a total of 20 locations. Results from grab groundwater <br /> investigations are shown in Figure 3. <br /> ' To help evaluate possible source areas and assist with design of this investigation <br /> plan, Figure 4 shows groundwater concentrations of 1,2-DCP and 1,2,3-TCP, with <br /> ' concentration contours drawn for 1,2-DCP. Concentration contours for 1,2,3-TCP are <br /> spatially very similar and are not shown. As illustrated in Figure 4, the highest <br /> concentrations of DCP and TCP are in the area north of the former liquid tank farm and <br /> ' east-northeast of the wash pad. This suggests that if there are any soil sources for these <br /> constituents, they are likely to be in this area. <br /> ' Figure 5 shows grab groundwater concentrations of nitrate and nitrite (as nitrogen) <br /> and ammonia, with concentration contours for ammonia. Nitrate is detected in grab <br /> groundwater samples across the site and could not be accurately contoured for the <br /> ' purpose of soil source identification. As shown in Figure 5, the higher concentration <br /> 6 GeoSyntec Consultants, 2000. "Site Investigation Work Plan, John Taylor Fertilizer Co., Inc., 1819 <br /> South Argonaut Way, Stockton, California." 1 July. <br /> ' P:\PRJ2003REM\Wilbur-Ellis\Wr0250(JTF)\STOCKTON\S LX\2005 Source Area Invest\SSI Work Plan.doc <br /> G. <br /> `�, RECYCLED AND RECYCLABLE r <br />