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The numerical designations for fertilizer indicate the minimum percentages ( respectively) of ( 1 ) total nitrogen , (2 ) available phosphoric acid and ( 3 ) water- soluble potash contained in the fertilizer . The chemical designation of the fertilizer shall be 16 -4 - 8 . Fertilizer shall include iron , minor nutrients and trace elements . At least 50 percent of the nitrogen shall be derived from organic sources . At least 50 percent of the phosphoric acid shall be from normal super phosphate or an equivalent source which will provide a minimum of two units of sulfur . The amount of sulfur shall be indicated on the quantitative analysis card attached to each bag or other container. Contractor shall ensure 1 pound of nitrogen per 1 , 000 square feet . E . Water for Grassing : Contractor shall provide the water used in the sodding operations as necessary to meet the requirements of Article 570 - 5 and 2 . 34 . B . F . Preparation of Ground : The area over which the sod is to be placed shall be scarified or loosened to a depth and then raked smooth and free from debris . Where the soil is sufficiently loose and clean , the Owner , at his discretion , may authorize the elimination of ground preparation . G . Application of Fertilizer: Before applying fertilizer , the soil pH shall be brought to a range of 6 . 0 - 7 . 0 . Contractor shall apply two ( 2 ) applications . The initial shall be fertilizer and the second application shall be "weed and feed " . The fertilizer shall be spread uniformly over the sodded area at the rate of 436 pounds per acre , or 10 pounds per 1 , 000 square feet , by a spreading device capable of uniformly distributing the material at the specified rate . Contractor shall apply applications as per manufacturer' s specification . All tickets from bags shall be handed over to the County Inspector . On steep slopes , where the use of a machine for spreading or mixing is not practicable , the fertilizer shall be spread by hand and raked in and thoroughly mixed with the soil to a depth of approximately 2 inches . H . Placing Sod : The sod shall be placed on the prepared surface , with edges in close contact and shall be firmly and smoothly embedded by light tamping with appropriate tools . Where sodding is used in drainage ditches , the setting of the pieces shall be staggered so as to avoid a continuous seam along the line of flow . Along the edges of such staggered areas , the offsets of individual strips shall not exceed 6 inches . In order to prevent erosion caused by vertical edges at the outer limits , the outer pieces of sod shall be tamped so as to produce a featheredge effect . Where sodding is placed abutting paved shoulder , the contractor is to ensure that the finished sod elevation is 1 % " below paved shoulder . On slopes greater than 3 : 1 , the Contractor shall prevent the sod from sliding by means of wooden pegs driven through the sod blocks into firm earth , at suitable intervals . 01025-21 Technical Specifications F :\PublicWorks\ENGINEERING DIVISION PROJECTS \ 1047-2 IRC Fairgrounds Overflow & Vehicular Staging Phase 2 \Admim \bid documents\Technical Specifications . doc