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N001 V <br /> Binayak Acharya Project 2074-001.01 <br /> May 18, 1995 <br /> Page 2 <br /> Results of the soil analyses showed that petroleum hydrocarbons and VOCs were only <br /> detected in one soil sample (boring MWA at 11 to 11.5 feet BGS). Petroleum <br /> hydrocarbons quantified as hydraulic oil and as mineral spirits were detected in this sample <br /> at concentrations of 22,300 and 840 mg/kg, respectively. VOCs were detected in the <br /> sample, including 0.0034 mg/kg toluene and 0.910 mg/kg 2-chlorotoluene. PCE was also <br /> detected at 0.113 mg/kg. The remaining soil samples did not contain detectable amounts <br /> of total petroleum hydrocarbons or VOCs. Results of soil analyses are presented in <br /> Table 1. <br /> The results of the groundwater analyses showed that no petroleum hydrocarbons or VOCs <br /> were detected in the sample from well MW-1, except for 1.4 micrograms per liter (µg/1) <br /> chloroform(Table 2). <br /> BASELINE CONDITIONS <br /> The sediments encountered in borings B-I and MW-1 are predominantly sands (with clay, <br /> silt, or gravel). Boring MW-1 was terminated after encountering clay at a depth of 93 to <br /> 98 feet BGS. Depth to groundwater in well MW-1 was approximately 72 feet BGS during <br /> November 1994. <br /> The soil analyses show that the petroleum-hydrocarbon-impacted soil is limited to the <br /> vicinity of boring MW-1 at approximately 11 feet BGS. No petroleum hydrocarbons or <br /> VOCs were detected at or below 15 feet BGS in boring MWA or in any of the samples <br /> from boring B-1. Boring B-1 is approximately 25 feet south of boring MW-1, indicating <br /> there is limited lateral extent for the compounds found in MW-1 at 11 feet (Figure 2). <br /> These analytical results, when considered in conjunction with the removal of the oil/water <br /> separator and surrounding soil, indicate that there is limited soil impact. <br /> The assessment of the soil and groundwater conditions adjacent to the former separator is <br /> sufficient to evaluate the possible risks and remediation alternatives. Boring MW-1 was <br /> placed at the end of the separator where the inlet piping is connected, a common location <br /> of leaks. Therefore, the samples from this boring most likely represent a "worst-case" <br /> condition of the soil in this area. EMCON does not believe that installing additional <br /> borings on the east and west sides of the former separator is warranted based on existing <br /> data. <br /> J ASEC'f1MU0740010.1 BR-9511jt:2 <br />