Laserfiche WebLink
lighter weight petroleum hydrocarbons were not detected in soil or soil vapor. Concentrations of <br /> oil-weight petroleum hydrocarbons were also detected in composited soil samples collected from <br /> five feet bgs. The concentrations of TPH as oil ranged from below the analytical method <br /> detection limit to 62 mg/kg. Other petroleum hydrocarbons,VOCs, and SVOCs were not <br /> detected in soil or soil vapor during this investigation. The locations of the TPH detections in <br /> soil are presented in Figure 6. <br /> Elevated concentrations of metals in the runoff drainage ditch and a battery storage room suggest <br /> impacts to shallow soil from CSMS activities. Metals were detected in soil at concentrations <br /> appearing to be elevated above expectable background levels (USGS, 1984) in the drainage ditch <br /> described above and at the former battery storage, filling and maintenance room in the CSMS <br /> building (boring B-12). Lead was detected in soil in boring B-12 at a concentration of 144 <br /> mg/kg,well below state and federal action levels. Elevated concentrations of lead and zinc were <br /> detected in composited surface soil samples collected from the drainage ditch previously <br /> described. Lead was detected at a concentration of 175 mg/kg in the eastern-most portion of the <br /> ditch (borings B-18a&b). Zinc was detected at concentrations ranging from 218 mg/kg to 912 <br /> mg/kg along the length of the ditch (borings B-15b through B-18b). Elevated metals <br /> concentrations were not detected in the soil samples collected at a depth of five feet bgs, below <br /> the surface samples. <br /> 5.2.1 Geophysical Survey <br /> Objects potentially representing reportedly buried tear-gas canisters were detected by <br /> geophysical, remote sensing methods in the unpaved vehicle storage area east of the Armory. <br /> The locations of the remotely sensed objects have been measured, mapped, marked in the field, <br /> and discussed with Sargent Mike Lincoln , hazardous materials coordinator for the CSMS and <br /> OMS. <br /> Unknown objects potentially causing uplift of pavement in the vehicle storage area east of the <br /> CSMS building (see Figure 4) have been detected by geophysical, remote sensing methods. The <br /> locations of the objects are apparently directly below the area of greatest pavement uplift at each <br /> of the two areas. The objects, or features, are non-metallic. The finding of the geophysical <br /> survey of these features was discussed with Sargent Lincoln by Versar. <br /> 5.3 OMS <br /> Soil, soil vapor, and groundwater samples were collected at the OMS to assess the impact of past <br /> and present OMS activities on shallow soil and groundwater. Impacts to soil from petroleum <br /> hydrocarbons were detected in shallow soil in the areas of the vehicle inspection rack (boring <br /> BH-20), and the former vehicle fueling area(borings B-26 and B-27). Releases of petroleum <br /> hydrocarbons from OMS activities at the vehicle inspection rack and from petroleum motor fuel <br /> are indicated. The releases appear to impact soil to depths greater than 10 feet bgs, and may, <br /> • therefore, present a potential impact to groundwater. <br /> 2187-01/3134-100/MAY26'00 15 <br />