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GROUND ZERO ANALYSIS,INC. Quality Control/Quality Assurance Plan All equipment will be checked daily and replaced as necessary. Instrument manuals and an instrument log book will accompany equipment into the field. Any calibration, repairs or related information will be recorded in the log book. 6.0 LABORATORY QA/QC PLAN Soil and groundwater samples will be submitted to a State Certified Hazardous Waste Laboratory for chemical analysis of hazardous constituents. Established QA/QC procedures for analytical operations will include sample custody procedures, standards of analytical accuracy, analysis of matrix spikes and method data,and maintenance of control charts to monitor analytical performance. These QA/QC procedures are outlined in the laboratory QA/QC Plan which is available upon request. Organic chemical analyses will be performed in conformance with standard procedures established by the United States Environmental Protection Agency (EPA) in "Guidelines Establishing Test Procedures for the Analysis of Pollutants Under the Clean Water Act" (40 CFR Part 136, October 1984). The laboratory is periodically evaluated through external performance audits conducted by EPA and Department of Health Services (DHS)using QC labs. The specific analytical methods to be utilized for purgeable and semi-volatile hydrocarbons analyses are shown on Table 2. 7.0 GROUNDWATER MONITORING PROTOCOL Monitoring of depth to water and free phase light non-aqueous phase liquids (LNAPL) thickness within wells will be conducted using an interface probe or conductivity meter. For consistency, all measurements will be taken from the north side of the wellhead at the survey mark. To assess potential infiltration of fine grained sediments,total well depth will also be sounded. Thickness of LNAPL on the groundwater surface is calculated by subtracting the depth to product from the depth to water. In addition, water elevations are adjusted for the presence of fuel with the following calculation: (LNAPL Thickness)(specific gravity)+(Water Elevation)=Corrected Water Elevation Newly installed wells will be allowed to stabilize for 24 hours after development prior to free phase thickness determination. An acrylic Surface Sampler will be used for visual inspection of the groundwater in order to note sheen (difficult to detect with the Interface Probe), odors, microbial action and sediments. The sampler is calibrated in inches and centimeters for visual inspection of product thickness. To reduce the potential for cross contamination between wells,the monitoring will take place in order from the least to most contaminated, if known. Well containing free product will be monitored last. Between each well monitoring the equipment will be decontaminated. Water level data collected from the wells will be used to develop a groundwater contour map for the project site. Groundwater flow will be estimated to be perpendicular to equipotential lines drawn on the map. G:\Data\GROUNDZE\STALLWORTH AUTO SALES(N CA)1380\Workplan\QA.QC Plan.docx 6