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HomeMy WebLinkAboutAV 91-12; Hill Residence; Administrative Variance (AV) (10)August 3, 1993 Mr. Steve Hill 331 7 Cadencia Street Carlsbad, Ca 92009 ENGINEERING REPORT FOR ADMINISTRATIVE VARIANCE 91 -1 2 - HILL RESIDENCE Pursuant to our discussions at your residence last week, I prepared the following list of criteria which should be included in the addendum to Mr. Vernon's engineering report: 1. 2. 3. 4. 5. 6. A site plan of your property drawn to scale showing the location of your house, retaining wall, driveway and side yard structure. The plan should include spot elevations of the rear yard, top of wall, bottom of wall (front and back of structure), pavement elevation next to the house (front and back), each of the surface inlets (including the one in the back yard), each of the pipe outlets and the curb flowline at the driveway. Include on the site plan a depiction of the subdrainage pipes which were existing or installed behind the wall and beneath the slab and driveway. Indicate pipe size, type of pipe, presence of perforations, presence and location of any permeable membranes or rock beddings, and invert elevations where available. Include cross section of construction techniques used for subsurface drains. Include in the report a discussion on the adequacy of the installed surface subdrains. Include calculations and supporting hydrology where necessary. Include a discussion on the potential reason why the surface and subsurface protection measures may have failed and how the presence of the roof structure 'solved' the problem'. Were the surface drains or pavement grades inadequate or was there some other design or construction deficiency 3 Include a characterization of the existing soils and how it may have contributed to the problem. Provide recommended measures to alleviate the problem assuming the roof structure is required to be removed from the sideyard setback. Include a cost estimate for the proposed remedial measures. 2075 Las Palmas Dr. - Carlsbad, CA 92009-1 576 - (61 9) 438-11 61 - FAX (61 9) 438-0894 @ If Mr. Vernon needs further clarification on what these items mean, please have him give me a call at 438-1 161 Ext 4362 and I will be happy to discuss them. with him. Thank you for your time and patience in resolving this matter. Respectfully, Assistant City Engineer cc City Engineer Assistant Planning Director Planning Technician II - Lynch