Longfellow Mill Site Engineering Evaluation/Cost

Longfellow Mill Site Engineering Evaluation/Cost Analysis and Ecological Risk Assessment Tuolumne County, California


Longfellow Mill is an abandoned mill that operated from the 1850s to the 1930s. The mill processed gold ore from nearby mines and produced 24,200 ounces of gold by 1899. The mill site is at about 2,900 feet amsl, and the topography is relatively steep and forested. The site occupies about 14 acres.

Residences and a baseball diamond are in the vicinity, and a tributary to Rattlesnake Creek flows through the site. Arsenic, mercury, and cyanide may have been released to soil and water at the site.

To address data gaps remaining after completion of the removal site inspection, Burleson planned and conducted site characterization activities, which included site mapping, trenching with backhoe, field x-ray fluorescence, sampling surface water, sediment, and pore-water, and sampling soil with hand tools (includes mine waste and sediment) and drilling (geoprobe).

Site characterization tasks were planned to achieve data quality objectives developed through systematic planning in accordance with DQO Process for Hazardous Waste Site Investigations (EPA, 2000 QA/G4-HW Final) and Guidance on Systematic Planning using the DQO Process (EPA, 2006 QA/G-4). Systematic planning was completed by Burleson after development of a conceptual site model to analyze complete human and ecological exposure pathways at Longfellow Mill. Data quality objectives for risk assessment and characterization necessary to support engineering evaluations were combined to guide planning of site characterization activities. Site characterization results were used to establish site specific risk thresholds for human and ecological exposures, develop removal action objectives, and develop and evaluate engineering alternatives. Results of this work documented site risks in the human health and ecological risk assessment and identified removal actions to mitigate site risks in the EE/CA.

Community Relations Assistance

Burleson also provided community involvement support to BLM including community meeting participation, interviews to solicit concerns and information needs, and preparing a Community Relations Plan (CRP) in accordance with the EPA Superfund Community Involvement Handbook (EPA 2005). We also assisted BLM in assembling the administrative record and in preparing a notice of availability of the administrative record.

Client Satisfaction

"Burleson Consulting was excellent to work with and very professional. They assembled a top-notch team of experts to study and propose solutions to the water supply challenges at Sutter National Wildlife Refuge. The communication was excellent throughout the project. This included project staff, contracting personnel, and interested stakeholders. As a result, the project was completed on time and on budget. I would not hesitate to use or recommend Burleson Consulting in the future."Kevin Clancy, Project Manager – United States Bureau of Reclamation

"Burleson provided exceptional services under this contract. Because of their successful work, they were awarded a $7M follow-on IDIQ contract in 2014, that also encompasses biological monitoring at former Fort Ord. They have consistently improved their plant material collection and propagation techniques and pass the savings onto the federal government. Burleson is a valuable team member on Fort Ord and I feel that they are true stewards of the environment." William K. Collins, BRAC Environmental Coordinator, US Army Corps of Engineers

"Burleson has been able to work with several government agencies (to include tribal groups and natural resource trustees) and several responsible parties to assist in progressing this site to a stage where technical and agency concerns can be identified and resolved. Strengths – overall and in depth understanding of mine site and CERCLA dynamics. Deficiencies – none. I would not hesitate to use Burleson." Daniel McMindes, USACE Liaison to EPA, US Army Corps of Engineers

"Burleson helped to manage the Sacramento Area Voltage Support Environmental Impact Statement. They came through and were always available during an ‘energy crisis’ in California. I will continue to work with them."Loreen McMahon, Project Manager - California Public Utilities Commission

"We appreciated Burleson’s great work, re: completing the draft EIR on the scheduled date (it was a tremendous task, but they completed it). All of them put a lot of work into it (it was a true team effort). They should all be proud of this accomplishment given the changes and obstacles encountered along the way, and I cannot thank them enough."Glenn M. Shuder, AIA, CFM, Chief Architect - Project Director, SMUD

"We chose Burleson Consulting because of their experience with the specific project matter in technical and regulatory issues and for their record of excellent communication skills in complex, multiparty projects. They were responsive to the matter and were sensitive to all relationships between the parties involved."Kevin Mayer, PE, Project Manager - USEPA