Laserfiche WebLink
ARCADIS GERAGHTY&MILLER <br /> with that reported in previous Site environmental investigations, consisting of fine sands, silts, <br /> clayey silts and clays Between 60 ft bgs and 119 ft bgs, layers of sandy silt, silty sand, silts, <br /> and clays were observed <br /> ' BoringNP-2 <br /> terminated at 123 S,ft bgs, is the deepest boring advanced to date related <br /> ' to the Site Boring NP-2 was advanced E-NE and downgradient (with respect to <br /> groundwater) from boring NP-1, in the sidewalk area across California Street The soils <br />' observed in NP-2 between ground surface and 60 feet bgs consisted generally of silt, silty sand, <br /> and silty fine sand layers Between 60 ft bgs and 123 5 ft bgs, layers of snits, silty sands, and <br /> silty fine sands were observed <br /> 1 <br /> 5.3 FIELD SOIL CHEMICAL ANALYTIC RESULTS <br /> 5.3.1 Boring NP-1 <br /> TPH as analyzed b EPA Method 8015 was detected in soils sampled with� Yz Y M, p t the <br /> Snnulprobe m boring NP-1 between depths of 20 and 80 ft bgs The highest TPHg <br /> concentrations were detected at depths of 32 ft bgs (390 mg/kg) and 60 ft bgs (420 mg/kg) <br /> TPHg was not detected, (detection concentration hnut of 10 mg/kg), in four successive <br /> samples taken from the 90, 100, 110, and 119 foot bgs depths These were the deepest four <br />' soil samples taken from NP-1 The results of TPHg analyses on soil samples collected from <br /> NP-1 are summarized an Table 5-1 and Figure 5-2 <br /> BTEX compounds, as analyzed by EPA Method 8020 were detected in soul samples at <br />' the same depth interval as the TPHg detections, and additionally at the 110 ft bgs depth The <br /> highest benzene concentrations were detected in the same depth intervals that the highest <br />' TPHg results were observed Concentrations of BTEX species in the 110 ft bgs sample were <br /> O 1 i mg/kg for benzene, 040 mg/kg for toluene, 023 mg/kg for ethylbenzene, and 0 19 for <br />' 22 <br />