During the Pre-CERCLIS screening (August of 2000), a well. showed perchlorate contamination 29.4 ug/L which is above the EPA Region 9 Preliminary Remediation Goal of 18 ug/L. Follow-up investigation detected SVOC and VOCs at low concentrations in neighboring wells. Final Integrated Removal Assessment , PA Report, and HRS (6/17/2004) determined "no significant threat to human health or the environment appears to exist"