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HUITTZOLLARS HUITT-ZOLLARS,INC. • 1102 Broadway,Suite 301 . Tacoma,WA 98402 . 253.627.9131 phone . 253.627.4730 fax . huitt-zollars.com SECTION 4: PERMANENT STORMWATER CONTROL PLAN Table 2: Threshold Discharge Area (TDA)Table Basin: 1 1 TDA Name: Groundwater I TDA Number: 1 Date: 10/22/21 Descriptions I On-Site Off-Site Total Existing Conditions Total Project Area (ft2) 8,716 0 8,716 Existing hard surface (ft2) 4,382 0 4,382 Existing lawn/landscape area (ft2) 4,334 0 4,334 Proposed Conditions Total Project Area (ft2) 8,716 0 10,807 Amount of new hard surface (ft2) 1,394 0 1,394 Amount of new pollution generating hard surface (PGHS)`(ft2) 1,572 0 1,572 Amount of replaced hard surface(ft2) 2,761 0 2,761 Amount of replaced PGHS' (ft2) 1,662 0 1,662 Amount of new+ replaced hard surface (ft2) 4,155 0 4,155 Amount of new+ replaced PGHS (ft2) 3,234 0 3,234 Amount of existing hard surfaces 320 0 320 converted to vegetation (ft2) Amount of Land Disturbed (ft2) 7,118 0 7,118 Amount of native vegetation converted 0 0 0 to lawn/landscaped area (ft2) Amount of native vegetation converted 0 0 0 to pasture (ft2) Existing native vegetation area to 0 0 0 remain (ft2) Existing hard surface to remain 1,598 0 1,598 unaltered (ft2) Value of proposed improvements($) $70,000 0 $70,000 Assessed value of existing site improvements ($) $45,000 0 $45,000 Amount to be graded/filled (Cubic 30 0 30 Yards) a. All terms are defined in the glossary found in Appendix G of the SWMMWW b. The total project area in the existing conditions should typically match the total project area in the proposed condition c. The"amount of new PGHS"should be part of or all of"amount of new hard surface" d. The"amount of replaced PGHS"should be part of or all of"amount of replaced hard surface" Fairway Estates MHC Entry Huitt-Zollars Stormwater Drainage Report December 15,2023 Everett,Washington Page 5