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Awe �t N ,�c�Jp�NTh/N ` E9;E -TU(Alt9a-SHADIPFs92.4/WPADD1.17 <br /> YCT 2ED <br /> ®92 07/21/92 <br /> pjyIRQNM N TAL HEALTH 3.0 PESTICIDE AREA <br /> PERV3.1 INVESTIGATION OF SOILS AT THE PESTICIDE MIX AREA <br /> Pesticide mixing and storing were conducted at Bldg. T-47. The area <br /> immediately adjacent to Bldg. T-47 is covered with concrete pavement. <br /> Bldgs. T-9, T-40, and T-67, which are located slightly to the northwest of T-47, <br /> were also used for pesticide storage, and mixing and rinsing reportedly was <br /> conducted outside adjacent to these structures. Much of the area immediately <br /> outside these buildings is unpaved. A shallow, unlined ditch drains the area. <br /> The ditch slopes gently downhill to the east for approximately 330 ft to a <br /> shallow depression, and beyond the depression slopes uphill to the east for less <br /> than 50 ft and then veers south. The area north of the ditch has been recently <br /> paved; to the south there is old pavement with small areas of bare soil. Previous <br /> studies have indicated the soil in the vicinity of the mix area is contaminated <br /> with organochlorine pesticides (ESE, 1990). The current study was intended to <br /> determine the lateral and vertical extent of soil pesticide contamination at the <br /> mix site and focused on the area encompassing the previously identified <br /> contamination and the unexplored drainage ditch. <br /> I <br /> i <br /> 3.1.1 RESULTS OF PREVIOUS INVESTIGATIONS <br /> As part of the RI (ESE, 1990), four soil samples (plus one duplicate) were. <br /> collected at two locations at the pesticide mix area (Fig. 3-1). Samples S1.131-A, <br /> Sl-Bl-B, and Sl-BI-C were collected in a single 15-ft-deep boring, Sl-Bl,.from <br /> i <br /> lip <br /> the intervals 0 to 5, 5 to 10, and 10 to 15 ft, respectively. `Sample Sl-Sl was <br /> collected from 0 to 1 ft in the ditch that drains the mix area. All of the samples <br /> were analyzed for organochlorine pesticides, chlorinated herbicides, and <br /> bromacil. Low levels of DDT, DDD, and DDE were detected in the 0- to 5-ft <br /> interval in the boring, still lower levels of DDT and DDE in the 5- to 10-ft <br /> 3-1 <br /> ta <br />