March 20, 2020

A Message from Waterstone President Jeffrey Dagdigian:

The health and safety of Waterstone’s clients and employees is our highest priority. As we continue to actively monitor developments related to coronavirus (COVID-19), we want to assure you that Waterstone is taking all necessary health and safety precautions in accordance with the CDC (Centers for Disease Control and Prevention) and local and state health officials for both our clients and employees. The purpose of...

February 23, 2018

It’s common in Southern California to discharge groundwater from dewatering operations (for instance, with a sump pump such as the one on the left)in subterranean building structures , such as a parking garage or basement, to the nearby storm sewer.

The dewatering is necessary to protect the integrity of the building structure from rising groundwater. Within the jurisdiction of the Los Angeles Regional Water Quality Control Board (LARWQCB), the practice is regulated unde...

February 1, 2018

What is a Hazardous Materials Business Plan?

Hazardous Materials Business Plans (HMBP's) exist in order to provide the public, emergency responding agencies, and local government agencies information regarding the potential for hazardous chemical situations in the community. HMBP's aid in:

  • Emergency planning

  • Emergency release notification

  • Chemical storage reporting

  • Toxic chemical release inventory reporting.

A business is required to have an HMBP if i...

May 19, 2016

Aerial photographs can be a key piece of information when determining the history of a property. Aerial photographs are one piece of the puzzle, and when combined with historical city directories, Sanborn Fire Insurance Maps, historical topographic maps, and site owner/user interviews, can assist the assessor in determining the previous usages of the property that may contribute to environmental issues. Aerial photograph review is an element of the historical document r...

October 2, 2015

Waterstone will conduct your subsurface investigation in accordance with the most current regulatory guidances. For active soil gas surveys, this means using the latest and greatest Advisory on Active Soil Gas Investigations published in July 2015. What do these changes mean for you? Because the agencies have chosen to eliminate purge test sampling, at least two fewer unnecessary samples will need to be collected and analyzed during each investigation. Also, decommissio...

September 28, 2015

The new stormwater year begins October 1, 2015. Time to start watching the weather reports and scheduling your monthly inspections in accordance with the Industrial and Construction General Stormwater Permits.

August 1, 2015


No Phase I Environmental Site Assessment can remove all the uncertainty from your purchase regarding the potential for recognized environmental conditions in connection with a property. Performance of this practice is intended to reduce, but not eliminate, uncertainty regarding the potential for recognized environmental conditions in connection with a property, and this practice recognizes reasonable limits of time and cost. 


A Phase...