The Property consists of a 2.3 acre lot that is being redeveloped as multi-family residences. Soil gas at the Site has been impacted by former dry cleaning operations (Henry Miller Cleaners, Marshall Steel Cleaners, and Payless Cleaners) that used volatile organic compounds (VOCs) including the dry cleaning solvent tetrachloroethylene (PCE or perc) in its cleaning processes. The dry cleaning businesses occupied the southern portion of the onsite building and operated between approximately 1965 and 1990.
Four site investigations were conducted between August 2015 and October 2018 in anticipation of residential development at the Property. These investigations detected VOCs in soil vapor along a portion of the north-western property line and lead and petroleum in a small area of shallow soil. No VOCs were detected in soil or groundwater above unrestricted land use clean up goals. These investigations detected VOCs in soil vapor including PCE at concentrations of up to 42,000 micrograms per cubic meter (µg/m3), benzene at up to 140 µg/m3, and ethylbenzene at up to 490 µg/m3 at five feet below ground surface (bgs) and toluene was reported at up to 41,000 µg/m3 at fifteen feet bgs.
The Department approved a Response Plan for remediation of soil and soil vapor at the Property on June 1, 2016. Response Plan activities were initiated in September 2016. The clean-up activities include excavation and disposal of lead and petroleum impacted soil and the installation of a vapor mitigation systems beneath buildings A3, A4, A5, and A6 where detections of VOCs in soil vapor are above health based screening levels.
On September 9, 2016, approximately nineteen tons of soil was excavated to address lead and petroleum contamination at the Property. Confirmation soil samples collected post-removal did not detect contaminants of concern above their respective screening levels. The Department approved the Remedial Action Completion Report for soil on April 25, 2017. No further action is warranted for soil.
In August 2018 the project proponent, the Pulte Group, entered into a Voluntary Clean Up Agreement (VCA; docket no. HSA-FY18/19-021) with DTSC to complete the remaining response actions at the Site including the installation and verification testing of vapor mitigation systems beneath the footprint of the buildings D, E, F, and G that are potentially impacted by VOC vapors. Pulte will enter into a Land Use Covenant (LUC) and Operations and Maintenance (O&M) Agreement with DTSC to ensure the ongoing effectiveness of the vapor mitigation systems.
(Updated by JT January 10, 2020).
Deed Restriction / Land Use Covenant:
SITE MANAGEMENT REQUIREMENTS:
ACTIVITIES PROHIBITED WHICH DISTURB THE REMEDY AND MONITORING SYSTEMS WITHOUT APPROVAL
DAY CARE CENTER PROHIBITED
HOSPITAL USE PROHIBITED
LAND USE COVENANT
NO EXCAVATION OR ACTIVITIES WHICH DISTURB THE SOIL BELOW A SPECIFIED DEPTH (SEE COVENANT FOR DEPTH) WITHOUT AGENCY REVIEW AND APPROVAL OF A SOIL MANAGEMENT PLAN
NOTIFY AFTER CHANGE OF PROPERTY OWNER
NOTIFY DAMAGES TO REMEDY AND MONITORING SYSTEMS UPON DISCOVERY
PUBLIC OR PRIVATE SCHOOL FOR PERSONS UNDER 21 PROHIBITED
RESIDENCE USE PROHIBITED
POTENTIAL CONTAMINANTS OF CONCERN