Weston Solutions, Inc articles

The Clean Air Mercury Rule (CAMR) requires coal-fired electric power plants to install and operate mercury  continuous monitoring systems by December 31, 2008 such that they will have 12 months of “submittable” data by 1 January 2010. For all practical purposes, “submittable data” are “quality-assured data” that meet the extensive quality control requirements cited in the various regulations that apply to the affected sources.

Although many power plants may opt out of continuous

Technical Area 21 (TA-21) is a former processing area located on a 0.5 square mile mesa top at Los Alamos National Laboratory (LANL), New Mexico. A series of threedimensional (3D) geospatial models were developed to support ongoing and future environmental restoration activities. Mining of lithologic, geophysical, infrastructure, and analytical data sets was completed to construct 3D site conceptual models of TA-21 at several scales. The models illustrate: (1) known and suspected contaminant sou

 ABSTRACT

Pacific Beach Point (PB Point) in La Jolla, CA, has frequently exceeded state water quality standards for indicator bacteria. As a result, studies were designed to investigate bacterial transport mechanisms and possible bacterial amplification occurring within the extensive kelp mounds found along the beach wrack line. Investigations thus far have shown that the wrack line acts as a bacterial reservoir that can impact receiving waters. At PB Point, initial dat

 Weston Solutions, Inc. (WESTON®) has designed and implemented a watershed-based monitoring program with the San Diego County Copermittees. The monitoring program includes three elements: Mass Loading Station (MLS) Monitoring, Stream Bioassessment Monitoring, and Ambient Bay and Lagoon Monitoring.

The core program includes the collection and analysis of stormwater runoff during three storm events at 10 MLSs. Samples are analyzed for chemical constituents, biological indicators, and tox

 INTRODUCTION

Stormwater program managers are challenged with meeting regulatory monitoring requirements to identify long-term trends and the effectiveness of the implementation of Best Management Practices (BMPs) and meeting multiple program requirements with finite resources. This paper provides stormwater managers with methods and several real-world scenarios using 10 years of data from the Los Angeles County Stormwater Monitoring Program to design long-term effectiv

Presentation Overview

•Historical Uses of Non-Liquid PCBs
•Regulation of Non-Liquid PCBs in the U.S.
•Examples of Continuing Non-Liquid PCB Uses and Use Conditions
•Case Studies of Non-Liquid PCB Use Evaluation
•Technical and Regulatory Trends in PCB Use

INTRODUCTION

Certain recreational beaches in southern California frequently exceed state water quality standards for indicator bacteria (total coliform, fecal coliform, and enterococcus). In San Diego County, two sites have been particularly problematic: Mission Bay, a large coastal embayment; and Dog Beach at the mouth of the San Diego River. Recent studies designed to investigate sources of indicator bacteria at these sites suggested that densities of indicator bacteria can be ampl

Abstract

Mission Bay is a large, heavily-used coastal embayment within the City of San Diego that includes over 27 miles of recreational shoreline. Historically, exceedances of state water quality standards for indicator bacteria (total coliform, fecal coliform, and enterococcus) have been a persistent problem at some beaches in Mission Bay. A 2-year comprehensive study was conducted to investigate and identify the numerous potential sources of bacterial contamination in the Bay recei

A monitoring program was designed with the San Diego County Co-permittees to:

Be adaptive and provide long-term trend information to predict short- and long-term impacts to receiving waters that result from changes in land use within each watershed

Provide data that can be analyzed to develop pollutant reduction strategies for those impacts.

A total of 10 mass loading stations covering 9 watersheds were monitored under this program.

Comparisons betw

Summary

Results of three large-scale regional benthic macroinvertebrate monitoring programs from Los Angeles, Orange, and San Diego counties were analyzed. Benthic community quality was quantified using a southern California IBI and was compared to the physical habitat quality scores of each monitoring reach. The purpose of the comparison was to determine if physical habitat quality was a limiting factor in the colonization potential of benthic macroinvertebrates. Over the coastal so