WORK PLANS - Laserfiche WebLink

Home Browse Search

3.0 QUALITY ASSURANCE AND QUALITY CONTROL The purpose of this section is to provide an internal means for control- ling and reviewing data collection and management. The fundamen- tal mechanisms for achieving these quality objectives fall into the cate- gories of prevention, assessment, and correction: • QC throughout sampling, analysis, data assessment (review), qual- ification, and feedback. • Quality assessment through periodic field audits and continual in- formal review. • Permanent correction of conditions that adversely affect quality through a closed-loop corrective action system. Various components of a QA/QC program have been described in previous sections of this document. These include the development of a sample collection and labeling protocol, a sampling equipment de- contamination protocol, use of a California-certified analytical labora- tory, and development of Chain of Custody procedures. This section addresses the remaining areas of concern, including field quality con- trol procedures, analytical testing procedures, laboratory quality control procedures, laboratory equipment calibration, auditing criteria, and cor- rective action measures. 3.1 FIELD QUALITY CONTROL PROCEDURES The analytical laboratory will be instructed to analyze two soil samples from a single stainless steel or brass sample liner. One duplicate will be analyzed for every 10 samples. If fewer than 10 samples are collected, one duplicate will be sampled per sampling event. 3.2 ANALYTICAL PROCEDURES All analyses will be performed by a California-certified laboratory. All analytical procedures employ either EPA-approved methodology for chemical analyses and ASTM methods for physical analyses. The labo- ratory will analyze submitted samples for DBCP, total organic carbon (TOC), moisture content, and grain size distribution. 3-1