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16 December 2010 <br />AGE-NC Project No. 10-1810 <br />Page 2 of 3 <br />is serviced by at least four separate septic systems, including a septic system east of the <br />residence. <br />DRILLING AND SAMPLE COLLECTION <br />AGE proposes to advance a total of eleven soil borings at the site. Four borings will be <br />advanced along the eastern property boundary to depths of approximately 80 feet below <br />surface grade (bsg), three borings will be advanced adjacent to the septic systems to <br />depths of approximately 20 feet bsg (excluding the septic system east of the residence), <br />and four borings will be advanced adjacent to the compressor and vehicle storage areas <br />to depths of approximately 5 feet bsg. Borings proposed to depths of 20 feet and 80 feet <br />bsg will be advanced using direct-push technology. Borings proposed to depths of 5 feet <br />bsg will be advanced using a 2-inch diameter hand auger. Boring locations may be <br />modified in the field depending on site conditions. Approximate boring locations are <br />illustrated in Figure 2. <br />Soil samples will be collected at 5-foot intervals, beginning at 5 feet bsg and terminating <br />at 20 feet bsg in direct-push borings. Soil sampling depths may be modified in the field <br />depending on conditions encountered during drilling activities. Soil samples will be <br />collected at 2-foot or 5-foot intervals to total depth in the borings advanced using a hand <br />auger. Soil samples will be collected using a direct-push soil sampling assembly or a metric <br />soil sampler loaded with stainless steel sleeves. Upon sample retrieval, the ends of a <br />selected sleeve will be covered with Teflon sheets, capped and sealed with tape. <br />Ground water samples will be collected from the proposed deep soil borings (80 feet bsg). <br />Ground water samples will be collected using a direct-push ground water sampling <br />assembly, fitted with a pre-cleaned, 1-inch diameter 0.01-slotted temporary well screen. <br />Ground water samples will be extracted by lowering a polyethylene bailer through the <br />hollow center of the push rods into the screen section. <br />Appropriately sealed and labeled samples will be placed in a chilled container under ice <br />and transported under chain-of-custody procedure to a California Department of Public <br />Health (CDPH)-certified laboratory. Each soil sample sleeve and ground water sample <br />container will be labeled with the boring designation, depth, time, date and sampler's <br />initials. Selected samples will be analyzed by Cal Tech Environmental Laboratories, a <br />CDPH-certified laboratory, for the following constituents: <br />Total petroleum hydrocarbons (TPH) by EPA Method 8015 Modified; and <br />Volatile organic compounds (VOCs) by EPA Method 8020 or 8260. <br />Advanced GeoEnvironmental, Inc.