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i <br /> SACRAMENTO <br />' 3 . 1. 1 Laboratory Analytical Methods <br /> The soil samples were analyzed in a mobile laboratory by <br />' Western Environmental Science and Technology (West) of Davis, <br /> California. The following analyses were performed by West: <br /> A. Total Petroleum Hydrocarbons (TPH--D) as <br /> Diesel [DHS Leaking Underground Fuel Tank <br /> (LUFT) Field Manual Method/Modified EPA <br /> Method 8015] ; <br /> B. Benzene, Toluene, Ethylbenzene and Total Xylenes <br /> (BTEX) [Modified EPA Method 8020] . <br /> IThe laboratory results are described in detail in Section <br /> 3 . 3 . <br /> 3 . 2 soil-Vapor Extraction Well Installation <br /> Each of the soil borings was converted to a soil-vapor <br />' extraction well upon completion of the soil boring. The soil- <br /> vapor extraction wells were constructed inside the hollow-stem <br /> augers as the augers were removed from the boring in small <br /> increments. Three of the wells (EW6, EW7 , and EW8) were <br /> ' constructed using previously decontaminated four-inch O.D. , flush <br /> threaded, solid and slotted (0. 020--inch slots) PVC casing. The <br /> fourth well (EW9) was constructed using previously decontaminated <br /> ' two-inch O.D. , flush threaded, solid and slotted (0.020-inch <br /> slots) PVC casing. PVC caps were screwed on the bottom of each <br /> 1 casing prior to lowering the slotted casing into the boring. A <br /> generalized diagram of the soil-vapor extraction well <br /> ' construction is shown in Figure 5 . <br /> The screened interval extends from approximately 10 feet bgs <br /> to 35 feet bgs in soil-vapor extraction wells EW7 , EW8 , and EW9 , <br /> and from 10 feet bgs to 45 feet bgs in soil-vapor extraction well <br /> EW6. The solid casing intervals extend from the top of the <br /> slotted section to a few inches bgs. <br /> 8 <br />