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Dr. John Farr Farr Associates June 30, 1997 Page 3 the top of ground water will be submitted for analysis in addition to the sample collected at five to ten feet below surface grade (bsg). The remaining two samples to be submitted will be selected between five feet bsg and the bottom of the boring based on elevated FID field results. Additional soil samples may be submitted based on field evidence. Following installation of the wells, they will be surged and developed according to protocols outlined in the California Environmental Protection Agency's Monitoring Well Design and Construction for Hydrogeologic Characterization Guidance Manual dated July 1995. Development water will be containerized on-site pending disposal. After development, the wells will be purged and sampled. Ground water samples will be analyzed for TPH as gasoline, TPH as diesel, BTEX, VOCs, semi-volatile organic compounds (SVOCs), and CAM 17 metals. The methods used for the analyses are presented in Enclosure C. Soil Vapor and Soil Sample Collection Background Metals To evaluate background concentrations of metals on-site, two hand auger soil borings will be installed on the western edge of the property. A soil sample will be collected from approximately three and six feet bsg from each boring. Each sample will be analyzed for CAM 17 Metals. If total threshold limit concentrations (T-ILC) exceed the acceptable soluble levels, solubility for those metals will be analyzed. Concentrations from these four samples will be used as a comparison with samples collected from other sample areas. The location of the two hand auger locations are shown on Figure 3. Dip Tank Area Three soil vapor/soil samples locations and one hand auger are proposed in the area of the dip tanks. The vapor sampling will be performed at depths of approximately 10 and 20 feet bsg. Soil gas will be collected from approximately 10 foot intervals from the borings and analyzed on-site for TPH as gasoline,BTEX,and VOCs. Soil samples collected from the same depths will be analyzed for SVOCs. The hand auger boring will be advanced to approximately six feet bsg and soil samples collected from three and six feet bsg. Samples will be analyzed for total oil and grease (TOG), TPH as gasoline, BTEX, VOCs,and SVOCs. Hand auger borings previously installed in this area collected soil samples at eight feet bsg and were analyzed for metals. Concentrations of arsenic, barium, chromium, and lead were reported above the laboratory's limits of detection, however each concentration was below each respective metals soluble threshold limit concentration(ST-C)as outlined in Title 22. Cement Mix and Cement Application Area Two soil vapor probes will be advanced in this area to a depth of approximately 20 feet bsg. Soil gas samples will be analyzed from 10 and 20 feet bsg for VOCs. The location of the soil vapor probes are shown on Figure 3. Buildine 2 Two geoprobe soil sample locations are proposed in Building 2. The geoprobes will be advanced to an approximate depth of 20 feet bsg. Soil samples will be collected at 5 foot intervals for geologic logging and possible chemical analysis. Samples collected at 10 and 20 feet bsg will be submitted for chemical analysis of CAM 5 metals, VOCs, SVOCs, and phenolic compounds. One boring will be advanced near a former drain,and one adjacent to the spray booth.