my name is lawrence carp. i am a geotechnical engineer. i have been working -- president chiu: could use the close to the microphone please? >> i've been working in san francisco for 50 years. i worked on telegraph hill, bilford landing, the end of alpha street. i have been building along in a pure land -- along napier lane. i am familiar with this piece of property because i worked for jack wheaton and davies on their property next door to build a retaining wall for them and a deck about 15 years ago. this particular property 1171 sansome slopes upward. the average slope from the northwest corner to the southwest corner is 68%. the upper part -- president chiu: 68% compared to the standard of 24%. >> right. about three times the amount allowed for a categorical exception for both line adjustments for 305 n ha -- 305 and 315 for subdivisions. in the upper part of the slope off of lower california terrace, which has not improved, is a massive sandstone that is very strong. as you move down the slope, it is supported by a shale. that shale i