ARCHIVED REPORTS XR0001587 - Laserfiche WebLink

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Approximately 24 - 48 hours after the new wells are developed, three to five well volumes will be purged, and samples will be collected from the well. The two groundwater samples from the newly installed wells will be submitted to the lab for the following analyses: TPH Purgeable by EPA Method 8015M/5030 (gasoline range) BTEX by EPA Method 8020/602 The samples will be submitted for analyses on a normal laboratory schedule requiring approximately two weeks (10 working days) for completion. 4) Composite Sampling of Previously Excavated Soil During previous excavation activities performed at the site by DSS Engineering Contractors for West Clay Properties, the excavated soils were separated into two piles. One of the piles contains approximately 250 cubic yards of overburden soil that is not anticipated to contain detectable levels of hydrocarbons. The other pile contains approximately 550 cubic yards of soil which is anticipated to contain detectable concentrations of petroleum hydrocarbons_ We request that both piles be composite sampled so that the soil may be considered for backfill material for the existing excavation, for on-site treatment, or for transportation to an off-site facility for treatment and/or disposal. The soil piles would be composite sampled by graphically dividing each pile up into 150 cubic yard sections. Each section would then be sampled from four different locations and depths. The four different samples within each section would then be composited into a single soil sample for chemical analysis . A total of six composite samples would be analyzed for the presence and concentration of the following: TPH Purgeable by EPA Method 8015M/5030 (gasoline range) BTEX by EPA Method 8020 TPH Extractable by EPA Method 3550 (kerosene range) The samples will be analyzed on a normal laboratory schedule requiring approximately two weeks (ten working days) for completion. Once the samples have been analyzed, the results will be evaluated for use of the soil as excavation backfill, on-site treatment, and/or off-site treatment/disposal. The results of that evaluation will be summarized in a short report which will be submitted to West Clay Properties and the SJCEHD upon completion. That short report could be used to evaluate some disposal/remediation alternatives for the soil. 5) Field Screening/Confirmation Sampling During Further Excavation Currently, the excavation is still open from previous excavation • activities by DSS Engineering. For this reason, it appears to be most cost effective to remove additional hydrocarbon affected soils at this time in order to speed future soil or groundwater remediation which will likely be required by the SJCEHD. Therefore, West Clay Properties will contract directly with an excavation contractor to conduct further excavation in the area