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' Libbey Owens Ford Co.-Preliminary Soil and Groundwater Investigation Report Standby Generator Diesel Supply Line January 20, 1997 Page-5- 3.2.2 Groundwater Sampling Groundwater samples were collected using the Geoprobe groundwater sampler. The ' groundwater sampler is designed to be hydraulically pushed into the aquifer from the bottom of a borehole to collect a groundwater sample from a discrete zone (see Appendix B for a description of ' the Geoprobe groundwater sampling system). The sampler utilizes a sealed, water-tight, stainless steel sample chamber and PVC screen which is isolated from the surrounding environment as the sampler is ' advanced. At approximately 15 feet bgs in each borehole, the sample chamber was opened by pulling back on the body of the sampler, exposing the screen. When the screen was full, a small diameter ' polyethylene tube was lowered into the'push rod and a groundwater sample pumped to the ground surface using a peristaltic pump. The sample tubing was replaced with new tubing prior to sampling ' each borehole. ' The groundwater samples were collected from the pump discharge. The samples were inspected for free product, petroleum odor, and sheen. Each sample consisted of two (2) 40-m1 glass ' volatile organic analyses (VOA) vials, and one (1) 1-liter amber glass bottle. The sample containers were sealed, labeled, and placed in a cooler chilled with ice for delivery under chain-of-custody ' procedures to GeoAnalytical Laboratories, in Modesto, California for analyses. ' 3.3 Chemical Analysis The soil and groundwater samples retained for chemical analysis were analyzed for benzene, toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method 8020 (602 for water), and for total extractable petroleum hydrocarbons quantified as diesel, kerosene, and motor oil (TEPH) by Method ' 35501LUFT (3510 for water). The analytical methods and analytical detection limits are presented below in Table 1. 1 1 t ' �l%� CONDOR