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HomeMy WebLinkAboutCT 02-16; ROBERTSON RANCH EAST VILLAGE; TRENCHING CALCULATION FINDINGS; 2008-04-08-1(6 CONSULTANTS - civil Engineering S Surveying April 8, 2008 4 J.N.011014-1 Mr. Joe McMahon Construction Inspector City of Carlsbad 5950 El Camino Real . . Carlsbad, CA 92008 Dear Mr. McMahon: Please see the enclosed exhibit for reference. Based on hydrologic calculations and field surveys gh 3/6/08 and. 3112/08,. the-following-table, sunimrizes my findings: . • Basin Design Volume (1) (CF) Actual Volume (CF) Additional Volume Provided (CF) 6 .. 19,548 29,916 10,368 8 18,684 56,106 371422 9 . 12,528 17,300 (2) - 4,772 3,600 CF per tributry acre per Option 2 of Water Quality Order. 99-08-DWG Assumes existing standpipe will be lengthened 6" so that -rim elevation = 72.5 Very, truly yours, O'DAY CONSULTANTS, INC. . • cVESSIo* : Registered Civil Engineer K.3. 32014 GO/Pm cc: Don Mitchell CIV N:\OI 1014\080408_McMahon2_Itr.doc . . . - . O'Day Consultants Inc. E-mail: oday©odayconsullants.com - - - 2710 Loker Avenue Wesl, Suite .100 Website: www.oday6onsul1ants.com . - Carlsbad. California 92010-6609 Tel: 760.931.7700 Fag: 760.931.8680