Status Report on Watermaster’s Water Quality Management Activities May 20, 2003.

Status Report on Status Report on Watermaster’s Water Quality Watermaster’s Water Quality

Management ActivitiesManagement Activities

May 20, 2003

Watermaster’s Activities to Watermaster’s Activities to Characterize Water Quality Characterize Water Quality

through OBMPthrough OBMPWatermaster initiated comprehensive water

quality monitoring program:– Samples 200 to 300 wells annually in southern

Chino Basin; 205(j) Groundwater Quality Study; Hydraulic Control Monitoring Program

– Obtains water quality data for non-ag pumpers from the pumpers, DHS and others

– Obtains reports and data from RWQCB, DHS, DTSC, Counties and others

Watermaster’s Activities to Watermaster’s Activities to Characterize Water Quality Characterize Water Quality

through OBMPthrough OBMP Maintains a comprehensive data base

Geologic data from wells Groundwater level and quality Migrating from MS Access-based to EQUIS SQL-

based system

Has developed a comprehensive geographical information system for characterizing groundwater conditions in the Chino Basin

Watermaster’s 2002/2003 Watermaster’s 2002/2003 Monitoring ProgramMonitoring Program

General minerals/general physical Perchlorate 1,2,3-Trichloropropane Wells within or near VOC plumes Following analytes where not previously sampled

in 1999/2000:– hexavalent chromium– Si, Sr, Ba– coliforms

Watermaster’s Watermaster’s Recommendation for On-Recommendation for On-

Going MonitoringGoing Monitoring Conclusion/recommendation of the 205(j) Final

Technical Memorandum:– Continued monitoring of water levels and water quality

influent to the desalter well fields is critical to optimizing the performance of these treatment facilities.

– Water levels should be measured at least annually.– All private wells should be sampled for general mineral and

general physical parameters at least once every three years. – Sampled for other contaminants (volatile organic chemicals

[VOCs], perchlorate, etc.) at least once every six years.