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rt rr Sy s1 <br />• ZNA <br /> Working To Restore Nature <br /> Dissolved petroleum hydrocarbons and BTEX constituents were not detected in monitoring wells <br /> MW1, MW4, MW5, and MW6 The sample collected from MW2 contained ethylbenzene, <br /> xylenes, and TPHG at 3.4, 1 8, and 59 parts per billion (ppb), respectively. The sample <br /> collected from MW3 contained ethylbenzene and TPHg at 350 and 780 ppb, respectively. <br /> BTEX levels in wells MW2 and MW3 were below the respective Maximum Contaminant Levels <br /> (MCLS) established by the Department of Health Services No MCLS have been established for <br /> TPHg Laboratory results are summarized in Table 2. Laboratory reports and chain-of-custody <br /> documentation are presented in Attachment 2 <br /> STOCKPILED SOIL <br /> Excavated stockpiled soils previously documented to be impacted by petroleum hydrocarbon <br /> constituents have remained on site since March 1991 excavation. The stockpiled soil has been <br /> aerating in accordance with the exemptions specified in San Joaquin Valley Unified Air Pollution <br /> Control District (APCD) Rule 463 5: Volatile Organic Compound Emissions from <br /> Decontamination of Soil <br />. c During a site visit on May 25, 1993 random soil samples were collected from the stockpiled soil <br /> by RESNA personnel and field screened with a flame ionization detector (FID) for the presence <br /> of volatile organic vapors. No organic vapors were evident in the stockpiled soil <br /> STATUS OF CORRECTIVE ACTION PLAN <br /> In correspondence dated September 28, 1993, PHS/EHD reiterated its request for a site <br /> Corrective Action Plan (CAP) by November 11, 1993. Based upon the results of laboratory <br /> analyses, groundwater samples collected from site wells contained low levels of dissolved <br /> petroleum hydrocarbons However, detected contaminants were below State MCLS. Moreover, <br /> no benzene was detected In any site wells in August 1993. Laidlaw Corporation maintains that <br /> natural biodegradative processes are actively reducing residual hydrocarbons in groundwater <br /> Active remediation does not appear to be necessary for this site <br /> It is anticipated that confirmation samples will be collected during the fourth quarter of 1993 <br /> from the aerated soil stockpiled on site <br /> Proj Disk1QUARTLYI3QR-1993 PNL 3 <br />