From 2015 through 2019 Applied Earth Sciences conducted a series of geotechnical, geologic and environmental studies on a Brownfield property, located in the city of Los Angeles. The site location was complicated by numerous factors: it is situated at the toe of an ascending slope near two mapped landslides; within the wider Newport-Inglewood Fault Zone; adjacent to Ballona Creek (a major watershed draining the northern Los Angeles Basin); in a liquefaction zone, near existing oil wells/fields, a methane zone, and was previously used as a petroleum product transfer terminal by Chevron, with 10 (leaking) underground tanks and 3 aboveground tanks. Prior to our involvement on the property, several other firms had conducted extensive geotechnical and environmental studies, which needed to be reviewed and incorporated into our analysis. Prior environmental reports indicated abundant gasoline and diesel contamination, which were partially remediated/removed. The site is also adjacent to a dry cleaner with a history of PCE and TCE contaminant discharges. Our client was a major corporation with plans to establish a mixed-use manufacturing and office facility on the site. AES conducted a multidimensional, multiyear investigation and analysis consisting of prior records review, five geotechnical borings and laboratory testing, six environmental borings with corresponding chemical analysis of samples, 13 cone penetrometer soundings for fault study, site and regional geologic mapping for landslide hazard, and preparation of numerous geotechnical, geologic and environmental reports. Mitigation recommendations included an impact wall and debris basin for debris storage as form of mitigation for landslide and mudflow hazard; mat foundation supported on piles to support the proposed buildings to mitigate the high groundwater and liquefaction potential; a portion of site set aside for dewatering and contaminated groundwater treatment prior to discharge into the creek; site grading to provide toe of slope setback; and a soil vapor mitigation system for the habitable buildings. Our reports were eventually approved by the LADBS for the construction of the proposed buildings, but the environmental remediation challenges remain, and the site remains vacant.