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Prior to the approval of construction documents, soil percolation tests shall be performed in accordance with the provisions of Section 1114.2.2 of the New York City Plumbing Code at the site of a proposed on-site stormwater drainage and detention facility installation to determine the suitability of the soil and site. Such test shall be performed under the supervision of a special inspector. The results of the percolation tests shall be filed on forms provided by the department, stating the suitability of the site and the capacity of the subsoil for the proposed use. The registered design professional of record for the dry-well system shall be notified immediately if the results of the percolation test demonstrate that the system may not function as designed.
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Reference Standard 16 Plumbing and Gas Piping [PDF] (page 59)
inch per foot. ***P113.9 Soil Percolation Tests. -Soil percolation tests shall be performed at the site of a proposed individual on site private sewage ...