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HomeMy WebLinkAboutSDP 2023-0012; LEGOLAND CALIFORNIA PROJECT 2025; WATER QUALITY STUDY; 2023-08-02 Chang Civil Engineering◦Hydrology◦Hydraulics◦Sedimentation P.O. Box 9496 Rancho Santa Fe, CA 92067-4496 T: 858.692.0760 F: 858.832.1402 wayne@changconsultants.com Memorandum To: Adam Kooienga, Hofman Planning Associates From: Wayne W. Chang Re: LEGOLAND California Project 2025 Date: August 2, 2023 LEGOLAND California Project 25 proposes a “LEGO Galaxy” attraction within the existing theme park. The project will cover approximately 2.38 acres and be located at the existing “Driving School” and “Junior Driving School” attractions, which will be demolished and removed. The major project components include a headline ride, secondary exterior ride, playscape, and play area. The development also includes grading, utilities, hardscape, planting, and retrofitting of existing recycled water irrigation systems. The grading plans, drainage report, and storm water quality documentation are being prepared by Commercial Development Resources. Since the project will disturb over an acre and redevelops over 10,000 square feet of impervious surface it is a Priority Development Project and subject to pollutant and flow control requirements. It is also required to develop and implement a Construction Storm Water Pollution Prevention Plan. The SWPPP will incorporate construction best management practices during grading and associated construction activities. The BMPs will reduce potential wind and water erosion during grading activities to prevent the potential discharge of pollutants into receiving waters. All development is subject to design review by the City of Carlsbad to ensure that the project would comply with performance standards and design guidelines. The project includes a storm water drainage system to prevent post-construction water quality impacts to downstream receiving waters. Storm water runoff from LEGOLAND California is currently conveyed to an existing regional BMP along the southerly edge of the LEGOLAND parking lot. The regional BMP has excess pollutant and flow control capacity. REC Consultants, Inc. performed analyses demonstrating adequacy of the regional BMP to treat the project’s runoff. The project’s storm water drainage system and water quality BMPs will be designed in accordance with all applicable requirements including those set forth in the Storm Water Quality Management Plan prepared for the project. The City will review and approve the Storm Water Quality Management Plan prior to the issuance of grading and building permits to ensure that the drainage system and BMPs comply with the Multiple Separate Storm Sewer System permit requirements. As a result, the project's water quality impacts would be less than significant.