Escondido planners approve five‑lot Hamilton Lane subdivision, 4–1, after debate over nearby superfund site

The Escondido Planning Commission voted 4–1 on April 28 to adopt Resolution 2026‑03 and approve a five‑lot tentative subdivision map for a 6.02‑acre parcel at the southeast corner of Hamilton Lane and Bernardo Avenue.

Melissa Demarzo, assistant planner for the City of Escondido, told commissioners staff recommends adoption of a first addendum to the project's previously adopted mitigated negative declaration and approval of the subdivision as conditioned. The project, filed in March 2024 and similar to a previously approved 2007 map that expired in 2021, would create five single‑family residential lots, add a bioretention basin and private street access for interior lots, and provide frontage improvements including sidewalk, curb and gutter.

Why it matters: residents and environmental advocates urged more review because the parcel sits near the Chattam Barrel Yard, a long‑standing state‑supervised hazardous site. Heidi Whitman, a neighbor who lives across Rancho Diego Court, told the commission that a 2025 monitoring report shows contamination along the plume boundary, that no soil vapor testing has been completed at this parcel, and that relying on the 2007 environmental document plus an addendum is insufficient. "You cannot conclude there is no impact when the specific area being developed has not been fully tested," she said.

The applicant and staff disputed the need for a new Phase II study. Rob Demaro, engineer of record for the project, said the conceptual plan preserves the large oak trees on the ridge and that the project proposes 85 new trees in total; staff confirmed tree protection notes and mitigation ratios (2:1 for oak trees, 1:1 for other trees). Staff also noted the Phase I environmental site assessment did not identify recognized environmental conditions on the parcel and that a previous monitoring well on the site was decommissioned in 2009, with an off‑site well to the north remaining active.

Commissioners split over whether to require additional pre‑grading testing. Commissioner Stevie said he was not comfortable moving dirt without a soil management plan to monitor for potential vapors and urged stronger safeguards; other commissioners and staff said Phase I results and existing regulatory monitoring reduce the likelihood of a site‑specific trigger for Phase II testing, and noted standard building practices (vapor barriers, slab‑on‑grade construction) and the county's oversight of the nearby site.

The approved conditions include biological mitigation measures carried forward from the earlier environmental determination (tree replacement and five‑year monitoring for oaks), requirements for pre‑construction biological surveys and tribal monitoring during ground disturbance where applicable, frontage and sidewalk improvements, and compliance with permitting requirements that would limit on‑site drilling of drinking water wells without county review.

The commission approved the project with Commissioner Jester moving and Vice Chair Spear seconding the motion; Chair Wiler, Vice Chair Spear, Commissioner Jester and Commissioner Gustoson voted yes; Commissioner Stevie dissented. The resolution was adopted and the project will proceed under the conditions imposed by the commission.

Next steps: staff will implement the project conditions and proceed with ministerial permitting steps. The record notes that additional monitoring or remediation requirements could be added if subsequent technical studies identify new risks.