To deliver responsive, ethical, and scientifically grounded cultural resource solutions that support sustainable development and safeguard California’s diverse cultural heritage.
Our Mission
CoreStone Archaeology, LLC, is a woman-owned California small business, certified SB (Micro) and SB-PW, with WOSB and CPUC certifications pending. Founder Katherine Sinsky, RPA, brings over a decade of field and project leadership experience to provide clear, regulator-ready cultural resource support for CEQA and Section 106 compliance. With a lean structure, 4WD field capability, and a trusted network of specialists, CoreStone delivers efficient, well-coordinated solutions tailored to each project’s needs
How We Got Here
After years of seeing compliance reduced to a box-checking exercise that delayed progress and sidelined meaningful engagement, CoreStone was founded to prove there’s a smarter way. Launched in La Honda with a laptop, a 4WD truck, and a commitment to practical, relationship-driven service, the firm was built to deliver cultural resource support that’s efficient, grounded, and genuinely collaborative.
What Sets Us Apart
Fast-turnaround desktop reviews and sensitivity assessments that give teams actionable insights early in the process.
Strategic teaming with trusted experts, scaled to match the scope and complexity of each project.
Transparent, competitive pricing based on a $175/hour baseline rate, with no hidden overhead.
Purposeful use of technology, including GIS, photogrammetry, and AI-assisted analysis, to streamline workflows while upholding the highest professional and regulatory standards.
About
Why “Corestone”
In archaeological contexts, a corestone or “core” is a chunk of rock that was used as a source material for stone tools. It represents both a source of material and the enduring core that remains.
The name CoreStone reflects our approach: grounded in substance, purpose-built, and responsive to evolving needs. Just as archaeologists analyze cores to understand past decisions and adaptations, we aim to provide clients with informed, adaptive strategies rooted in cultural insight and regulatory clarity.
Our Values
Integrity, collaboration, sustainability, and respect guide every decision. We believe cultural stewardship and development are compatible, and we work every day to make that balance practical and efficient for our clients.
Meet Our Founder
Katherine Sinsky, MA, RPA
President & Principal Investigator
Katherine is a Registered Professional Archaeologist with over a decade of experience across federal, state, and private-sector projects. She has led cultural resource work in several states for the National Park Service, Bureau of Land Management, and U.S. Forest Service, as well as for infrastructure, energy, housing, and wildfire recovery projects throughout California.
After serving as California and Hawai‘i Account Executive at a large CRM firm, Katherine founded CoreStone to offer clients a more responsive, cost-effective, and collaborative approach to cultural resource management. Her work is grounded in scientific integrity, ethical stewardship, and deep respect for both land and people. She brings an interdisciplinary mindset and flexible strategies to support responsible land use, balancing development with meaningful preservation.