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GEOSYNTEC CONSULTANTS <br /> Ms. Amy Terrell <br /> 31 January 2005 <br /> Page 3 <br /> account for the trace levels observed in groundwater samples. Therefore, the <br /> ' investigation proposed in this work plan is aimed at addressing other groundwater <br /> constituents cited by the RWQCB, including nitrate, ammonia, 1,2-dichloropropane <br /> ' (1,2-DCP), and 1,2,3-trichloropropane (1,2,3-TCP). These chemicals are consistently <br /> found in site monitoring wells at concentrations above California maximum <br /> contaminant levels (MCLs) for drinking water. <br /> PREVIOUS SOURCE AREA DELINEATION <br /> ' Soil Investigation <br /> ' JTF and GeoSyntec investigated conditions in the operations areas as part of a <br /> Phase II Environmental Site Assessment 6. Five soil borings, STOI through ST05, were <br /> advanced in January 1999 near the former liquid tank farm, the vapam tank, the old <br /> ' wash pad area, and an equipment storage area. Soil samples were collected from one, <br /> five, and ten feet below ground surface(bgs). The soil samples were analyzed for: <br /> t • Nitrate and nitrite as nitrogen; <br /> • Ammonia as nitrogen; <br /> • J g <br /> Total Kjedahl Nitrogen(TKN); <br /> • Volatile Organic Compounds (VOCs)(EPA Method 8260); <br /> • Organochlorine Pesticides and PCBs (EPA Method 8081); <br /> ' • Or ano hos horous Pesticides, including analysis for Bolero (thiobencarb) and <br /> ' Ordram (molinate)(EPA method 8141); <br /> • Chlorinated Herbicides (EPA Method 8151); <br /> ' • EDB, DBCP, and 1,2,3-trichloropropane(MSE002); <br /> ' P:\PRJ2003REM\Wilbur-Ellis\Wi0250(JTF)\STOCKTON\S 1.X\2005 Source Area Inve&SSI Work Plan.doc <br /> G� <br /> `^, RECYCLED AND RECYCLABLE w <br />