Response Action Work Activities Status Update

Groundwater:

During September 2017 Warmington Residential completed a series of bioremediation injections into the groundwater beneath the property to accelerated the reduction of TCE concentrations. Groundwater samples were obtained from five new monitoring wells and three existing wells, prior to the injections, to determine the baseline TCE concentrations. Groundwater samples were collected in December 2017 and March 2018 at 3 months and 6 months after the injections were completed to assess the effectiveness of the enhanced bioremediation. At 3 months and 6 months the TCE concentrations were significantly reduced. The baseline, 3 months, and 6-month groundwater monitoring results can be viewed here.  A second bioremediation injection is planned in May 2018 to target a high TCE groundwater area in the southwestern portion of the property.

Soil Gas:

TCE in the shallow groundwater volatilizes and migrates into the soil in the form of TCE Soil Gas Vapor. During September 2017 Warmington Residential initiated operations to reduce the high TCE soil gas concentrations in the soil through Soil Vapor Extraction (SVE). 37 soil vapor extraction wells and 14 soil gas monitoring wells were installed at the property. Baseline soil gas samples were taken from the monitoring wells prior to the start of the soil vapor extraction and treatment system. After 8 weeks of operations, the SVE systems were shut down and rebound testing was conducted at intervals of 1 week, 3 weeks, 2 months and 3 months. The soil gas test results can be viewed here. SVE operations will continue through mid-June 2018 to target the remaining high TCE soil gas concentration areas in the southern portion of the property.

Response Action Work Activities Update

Preparations for the response action activities at the 277 Fairchild Drive property began on Monday, September 11, 2017 with the installation of several groundwater monitoring wells which will allow the sampling of groundwater for the purpose of assessing the baseline conditions and the effectiveness and results of the response action activities.

The in-situ enhanced bioremediation technology (bioaugmentation) is being used to accelerate the degradation of trichloroethene (TCE) and other contaminants of potential concern in the groundwater. Cultured microorganisms, nutrients, and substrate will be injected into the groundwater to reductively dechlorinate and reduce TCE levels in the groundwater. The compounds used to break down the TCE are used up during the process and do not remain in the groundwater aquifer after the process is complete.

Beginning on Monday, September 18, the injection process will occur at 42 locations over a 2-week period at depths to 32 feet below ground of surface.

Once the groundwater injections are complete, the Soil Vapor Extraction and Treatment  process to remove and reduce TCE vapors in the soil will begin in October 2017 and this process is estimated to last a minimum of six months.

Response Action Plan Approval

Great News! Warmington has received preliminary approval of the Response Action Plan for the cleanup work at 277 Fairchild Drive in Mountain View, CA. The Response Action Plan describes the methods and procedures for Soil Vapor Extraction and treatment and the Groundwater injections intended to target and reduce the high trichloroethene (TCE) levels in the soil vapor and shallow groundwater beneath the property. A copy of the Response Action Plan can be viewed here.

The response action work is currently planned to begin around the second week of September 2017 and will continue for approximately six months. Periodic updates will be posted. Based on the results of the response actions, we are hoping to begin construction in the spring/summer of 2018.

Site Grading

Warmington will begin clearing and grading the site at 277 Fairchild the week of April 17, 2017. The exact start date will depend on the weather. This portion of the work should last about two weeks. The work will include shaping the site to accommodate the future roads and buildings and compaction of the soil to handle the future structures. The process will involve some large earthmoving and compacting machinery.

Once the grading is completed, we are planning to conduct additional testing and cleanup work. We will provide a schedule update and post the work plan when approved by EPA.

Preparing To Build

Demolition of the existing structures at 277 Fairchild, 228 and 236 Evandale was completed on 9-13-16. The subsurface excavations we observed by an Archeologist. No artifacts were unearthed during the work. Air samples were also collected during the subsurface work. The test results are posted on this site under “Daily Field Reports”. There will be little or no activity on the site until we receive our remaining project approvals from the City of Mountain View.

New look for the Old Moffett Motel site

We are excited to see progress at our new community. The Mountain View Fire Department has been conducting training exercises at the site. We are happy to provide them access to the existing buildings for use in non-fire exercises such as building entry and breaching of walls and roof areas.

Demolition of the existing buildings will begin August 29, 2016 and will last about two weeks. Once the demolition is complete and the site is cleared there will not be any activity on the site until we receive the remaining City approvals. We are hoping to receive these approvals in October 2016.