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KLE/NFELOER <br /> 8,,ght Peopl,.Right S -01s. <br /> 4 SITE CONDITIONS <br /> 4.1 SITE DESCRIPTION <br /> At the time of our study, the subject site consisted of a trucking facility occupied by several steel- <br /> framed shop buildings, a house being used as an office, truck trailers and other equipment, and <br /> almost no vegetation cover. The property was bounded on the north by a trucking facility with a <br /> house, on the west by an industrial development, on the south by a canal and an abandoned <br /> open pit mine, and on the west by an open pit mine. The parcel is zoned I-G (General Industrial). <br /> We understand that the existing on-site septic/leach field system that is connected to the <br /> house/office will be used as-is for a proposed new office/shop building. No expansion of the <br /> existing septic system is planned at this time, and no change is usage/loading of the septic system <br /> will occur with the construction of the new office/shop building. A map showing the approximate <br /> location of the existing septic/leach field systems is presented on Figure 2. The location of onsite <br /> well is also presented on Figure 2. <br /> 4.2 PRESENT AND PAST USE <br /> The project site is currently occupied by a trucking facility. Historical aerial photographs indicate <br /> that the site has been used for this purpose since at least 2004. Aerial photos from 1993 indicate <br /> the presence of the existing residence surrounded by undeveloped land. We saw no evidence <br /> that the site has been used as a dairy, and we know of no other past uses of the site. A historical <br /> aerial photograph of the site from 1993 is presented on Figure 3. <br /> 4.3 SUBSURFACE CONDITIONS <br /> Based on the percolation test holes drilled to depths of about 6 and 23 feet below ground surface <br /> for this investigation, the subsurface soils near the location of the existing septic system generally <br /> consist of silty sand with gravel to poorly-graded sand with gravel in the upper 2 feet, underlain <br /> by sandy lean clay to a depth of about 5 feet. These soils were underlain by interbedded layers <br /> of silty sand, sandy gravel, poorly graded sand, and gravel with sand. <br /> 20210068.001A/ST020R110989 Page 5 of 14 April 30, 2020 <br /> ©2020 Kleinfelder www.kleinfelder.com <br />