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k'9 KLEINFELDER and broken up to facilitate its disposal. The demolished tank will be disposed at an approved facility. A new septic tank will be replaced in the excavation rated for the use of the site. (It should be noted that the soil sampling , as shown in the following section, will be completed prior to the replacement of the septic tank). The septic tank replacement will be handled by Parrish & Sons, Inc. of Stockton, California. Soil Sampling As a limited and preliminary soil assessment soil samples will only be collected from points of obvious potential discharge of wastes in the septic system. The points of potential discharge of waste are identified as; soil beneath and sidewalls of the tank, the discharge flange of the septic tank to the leach line, the leach line/field, and the connection point of the leach line to the seepage pit. The soil sampling is designed to determine either the presence or absence of the constituents listed in the following Laboratory Analysis section, and quantify the results. Kleinfelder proposes to advance a total of 8 hand augers borings to investigate the shallow subsurface soils near the septic tank, leach line, and seepage pit. Two of the soil samples will be collected from native soil from beneath 4each end of the tank. It is anticipated that approximately 1 to 2 feet of soil will be excavated from around the tank prior to its removal. One of soil borings will be advanced on the northern end of the septic tank near the position of where the flange or transition from the tank to the leach line. Four of soil borings will be advanced at an angle along the leach line, spaced at 20 foot intervals, to the area directly below the gravel pack of the leach line and into native soil. The final boring will be advanced next to the transition point of the leach line and seepage pit and also below the gravel pack of the leach line and into native soil. The borings will be advanced at an angle in an attempt to intercept the area of native soil directly below the points of interest. It is anticipated that the soil borings will not extent past 36 inches at this time. See Plate 2 for the proposed soil sampling locations. To facilitate the collection of the soil samples, the concrete that is presently over the leach line and septic tank will be broken and removed. Kleinfelder will arrange and supervise this task. A total of 2 soil samples will be collected from the north end of the septic tank, below the outlet flange of the tank. The soil samples obtained from near the septic tank flange will be collected below the interface of the observed fill dirt near the flange and native soil (24-inches), and also approximately 1 foot below the top of the native soil. The soil samples will be assessed in the field for lithology and logged. At this time we propose to analyze the soil sample collected from the 24-inch interval only. The remaining soil sample will be held pending further site characterization. A total of 8 soil samples (2 per boring) will be collected from the 4 borings advanced along the leach line. The concrete covering the leach line will be removed and a shallow excavation will be advanced with a backhoe parallel to the leach line to expose the native soil beneath the leach line and gravel pack. The soil samples will be collected from just below the interface of the leach line gravel pack and native soil and one additional foot below the interface (36-inches). 34202.E01 /ST03R1 130 Page 3 of 7 Copyright 2003,Kleinfelder,Inc. August 8,2003