Category: Industry

Proposed Changes to Underground Storage Tank Regulations

The State Water Board proposes to amend California Code of Regulations, title 23, division 3, chapter 16 (commencing with section 2610) (California UST Regulations) to make the California UST Regulations at least as stringent as part 280 of 40 Code of Federal Regulations (Federal UST Regulations). These proposed amendments are administrative and technical in nature and impose new design and construction, monitoring, notification, testing, inspecting, recordkeeping, training, and reporting requirements. The proposed amendments also include more stringent requirements which are necessary to implement chapter 6.7 of division 20 of the Health and Safety Code and modifies certain existing California UST Regulations to be consistent with the Federal UST Regulations.

The 45-day public comment period for the proposed Title 23 regulations ended on January 2, 2018. State Water Board staff is currently reviewing the comments received and preparing responses for the rulemaking record. Based on the comments received and necessary revisions to the proposed regulations or the Initial Statement of Reasons, an additional comment period (either 15-day or 45-day) may be necessary. The proposed rulemaking package is available at:

Unified Program Newsletter – January 2018

2018 Battelle Conference Acceptance

Equipoise is please to announce that our abstract, submitted by Mr. Steven Pitts, on Environmental Fracturing in Low-K Conditions to Enhance Soil Vapor Extraction was accepted for the 11th International Battelle Conference on Remediation of Chlorinated and Recalcitrant Compounds that will be held April 8th – 12th in Palm Springs, California.

Background/Objectives. The soil and soil gas at a former industrial facility in California (The Facility) are impacted with volatile organic compounds (VOCs) including trichloroethene (TCE). Soil vapor extraction (SVE) and two-phase extraction (TPE) systems have operated for several years at the Facility; however, VOC recovery rates with the current SVE/TPE well system have reached asymptotic conditions. This is a function of extended remediation operations at each SVE/TPE well and low effective porosity conditions comprised of friable to moderately indurated sandstone with varying degrees of cementation. The Environmental Fracturing (EF) technology was implemented at the Facility to increase air flow within the unsaturated zone and enhance the performance of the existing SVE/TPE systems.

Follow the link to read the full abstract:

SWRCB Removes Hexavalent Chromium MCL

In accordance with a recent court ruling, the State Water Resources Control Board adopted a resolution today to remove the current maximum contaminant level (MCL) for the pollutant hexavalent chromium found in drinking water. The State Water Board will now begin work on establishing a new MCL for the contaminant.

See press release for more information:

Former Pacific Treatment Site Cleanup & Closure

Equipoise achieves no further action finding and closure of the former Pacific Treatment site, a former hazardous waste storage and treatment facility, located at 2190 Main Street, San Diego, California.

In May 1986, an unauthorized release case was opened  when a tar-like product was observed in the excavation during the removal of four underground storage tanks that reportedly stored diesel. Soil sampling conducted after the tank removal showed low concentrations of petroleum hydrocarbons.

Groundwater monitoring was conducted from June 1996 until June 25, 2015.  Free product removal methods previously conducted at the site by prior consultants, which included: purging with a bailer, purging with a vacuum truck, absorbent socks, passive and active skimmers, and dual phase vapor extraction, were ineffective.

In 2014, Equipoise successfully implemented a full-scale bioslurping remediation plan—a method which combines vacuum assisted product removal with soil vapor extraction to simultaneously remove product and remediate soil vapor—using the existing monitoring well network resulting in the closure of the site.  For more information follow the link below.