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methods, and material specifications shall meet the parts of Minnesota Rules Chapter 7080 adopted <br />bv reference in Subdivision 2 of this Section be according to the miniiuum standards and criteria <br />listed in MTCA Regulations Chapter 7090. with the following additional minimum standards: <br />A. Site Evaluation. The site evaluation report shall include the following: The <br />pro po sed site o f every new system or altered or expanded existing system shall be investigated by <br />a qualified site evaluato r who shall prepare and submit a report to the City therein identifying relative <br />site elevations and loc atio ns o n a plot plan; water table depth, so ils and so il characteristics; <br />tabulating the results o f required soi l bo rings and perco latio n tests; describing the testing method s <br />and equipment used; and generally evaluating the suitability of the site fo r system construction and <br />use as stated in NIPCA-Regulatio ns Chapter 7080. Site evaluation shall be prepared and signed by <br />a NIPCA certified site evaluator , including the site evaluator 's certificatio n number. The site <br />evaluator must also be licensed to o perate in the City o f Oro no . <br />1. Soil Borings. At least three soil borings shall be completed for each new <br />drainfield site designed. Each soil boring must be located within the drainfield site or within close <br />proximity alone similar contours such that similar soil conditions are likely. For additions to <br />existing systems, at least one soil boring shall be made in the expansion area. . Soil borings must be <br />taken to a depth at least 5 feet belo w any pro po sed so il treatment system. If a water table or soil <br />mottling is enco untered at a depth less than 5 feet, the bo ring shall be cont inued to a depth 2 feet <br />belo w the highest water table or mott ling indicator . <br />The number o f so il bo rings necessaiy for the site evaluatio n repor t listed-belo w is the minimum <br />requirement. Additio nal bori ngs may be requested by the City due to questio nable so ils:' <br />--------------------------------(a) For new systems, at least three so il bo rings shall be made within <br />the primary drainfield area and three soH bo rings within the alternate drainfield area; <br />-------------------------——(b) Fo r replacement systems, at least three soil bori ngs shall be made <br />in the pro po sed replacement area. <br />--------------------------------(c) Tor additio ns to existing systems at least one so il bori ng shall-be <br />made in the expansio n area: <br />2. Percolation Tests. At least two percolation tests shall be completed for <br />each new drainfield site designed. Each percolation test must be located within the drainfield site <br />or within close proximity along similar contours such that similar soil conditions are likely. For <br />additions to existing systems, at least one percolation test shall be completed in the expansion area. <br />The number rf perco lation tests required for the site evaluatio n repo rt listed belo w is the minimum <br />requireme:it. Additio nal perco latio n-^sts may be requested by staff due to questio nable so ils. <br />---------------------------------(a) For nr.* tr-stems, at least three perco latio n tests shall be made <br />within the primary drainfield- area and three perco latio n tests within the alternate drainfield area. <br />(b) For drainfield replacements at least three perco latio n tests shaH <br />Page 11 of 22