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to select appropriate disposition Disposal will be the responsibility of the facility operator All I soil bonngs will be backfilled by pouring a cement slurry not exceeding 5% bentonite through the auger 3.3 Soil Sampling Soil samples will be collected to the first occurrence of groundwater and will be collected at 5-foot intervals Groundwater has been measured at approximately 75 feet bgs Soil samples will be collected through the auger in three 6-inch long brass sleeves with a 2- inch diameter in a split-spoon sampler The sampler is driven ahead of the auger by a 140 pound hammer with a 30-inch drop The brass sleeves and sampler will be washed with an Alconox solution, and rinsed with deionized water prior to each use ' One brass sleeve containing soil from each interval will be capped, sealed, labeled in accordance with EPA protocol, recorded on a chain of custody form, placed in a cooler at 4 degrees centigrade or less, and transported to a California certified analytical laboratory for the specified analyses under proper chain of custody documentation Another brass sleeve will be used for lithologic description All field data regarding lithology, recovery and blow counts will be ' recorded on boring logs 3.4 Field Screening of Soil Samples One brass sleeve will be used for field screening of samples The material from the top tube will be placed in a sample far to approximately 50 percent capacity, shaken, and stored for a ' period of approximately 5 minutes A standard headspace reading will be collected at this time using a Foxboro organic vapor analyzer (OVA) or equivalent field instrumentation, and noted on the boring log 3.5 Soil Analyses Soil samples will be analyzed by a California certified laboratory in accordance with State guidelines and EPA protocol The samples will be selectively analyzed for total) petroleum hydrocarbons (TPH) quantitated against both gasoline and diesel standards and benzene, toluene, ' ethylbenzene, and total xylenes (BTEX), using EPA methods 8015 and 8020, respectively It is anticipated that eight samples from each soil boring will be analyzed for TPH BTEX analyses will be conducted on any sample with a detectable concentration of TPH One sample ' from each boring, collected at the depth corresponding to the highest TPH concentration, may be analyzed for total lead, using EPA method 7421 ' 3.6 Installation of Monitoring Wells Three groundwater monitoring wells will be constructed in soil borings as shown on Figure 2 The wells will consist of 4-inch, flush threaded, schedule 40 PVC slotted and blank casing A A 1125J2 WP 5 1