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Peters Kwikee Food Preliminary Site Assessment Report Project No.01-46.1.1 22 June 1990 L Page 5 ' 5.9 Monitoring Well Development The monitoring well was developed before a water sample was collected. This was accomplished by pumping until clear ground water is obtained and then removing an additional 5 well volumes. The extracted ground water was stored in 55-gallon drums until it was determined that the water was contaminated. Contaminated water will be treated at a later date. 5.10 Ground Water Sampling The well was purged by pumping 5 well volumes (one well volume = the amount of water contained within the well casing and in the annular space) before sampling the ground water. A travel blank was provided by the Laboratory and blanks will be collected before sampling to insure bailer cleanliness. Water samples were collected by using a polyethylene disposable bailer. All samples were taken to GeoAnalytical Laboratories in Modesto, California at the end of the sampling day. GeoAnalytical Laboratories is a State certified analytical laboratory. Soil and water samples were analyzed for benzene, toluene, total xylenes and TPH-gasoline using EPA method 8020/602. Soil samples were also tested for total lead using EPA method 7420, and the water sample was tested for organic lead using the LUFT manual. 5.12 Detection Limits of Analysis The detection limit for BTX&E is 5 µg/kg and gasoline is 1 mg/kg in soil samples. The detection limits for BTX&E ranges from 0.3 to 0.6 gg/l and gasoline is 0.5 µg/l in water. The detection limits for total lead is in soil is 2.5 mg/kg and .1 mg/l in water, and for organic lead are .5 mg/kg in soil and .05 mg/1 in water . 5.13 Data Reduction Analytical data was integrated with the geological data gathered during the field investigation. This information is the basis for interpreting the extent of contamination and for developing any remediation options.