ARCHIVED REPORTS XR0000154 - Laserfiche WebLink

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The well will be purged of three well volumes of groundwater utilizing a decontaminated bailer or pump (depending on volume of water to be removed) A water sample will be collected from the well when the water reaches 80 percent of its initial level If the well is slow to recover, a sample will be collected after the well has stabilized If the well is found to contain free product, a sample for laboratory analysis will not be collected Measurements of temperature, conductivity, and pH will be measured and recorded to verify well stabilization Groundwater will be sampled using a new Voss Technologies disposable bailer The water sample will be placed in appropriate containers supplied by the laboratory Care will be taken that no headspace is present in sample bottles which will be analyzed for volatile organic compounds Once the sample is collected, the bottles will be placed in "ziploc" bags and sealed with security tape The sample will be stored in an ice chest with water ice until delivery to the on-site mobile laboratory The water samples will be analyzed by a California state certified mobile analytical Iaboratory The sample will be analyzed utilizing the methods and detection limits shown below: ANALYSIS NAME SAMPLE METHOD DETECTION LIMIT* CONTAINER (ppb) BTEX Three 40m1 EPA (benzene, volatile organic MODIFIED toluene, vials with HC1 8020 05 ethyl benzene, total xylenes) TPH as diesel Two one liter DHS GC-FID amber bottles MODIFIED 50 with HCl (8015) NOTE: TPH = Total Petroleum Hydrocarbons The sample will be delivered to the laboratory in a chilled ice chest with appropriate chain of custody forms Upon arrival to the laboratory the samples' condition will be checked and any nonconformaties will be noted on the chain of custody forms. Copies of signed laboratory reports will be presented in the subsequent Site Investigation Report MZAD9-21-93/ENG/93-0127 bk 5