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I <br /> CLEARWATER <br /> 66 G R O U P, I N C <br /> dispenser island The additional vapor extraction wells were installed in late 1994 <br /> and the soil vapor extraction (SVE) system was installed in February 1995 <br /> I <br /> 3.0 QUARTERLY FIELD ACTIVITIES <br />' All groundwater monitoring completed this quarter was performed in accordance <br /> with Clearwater Field Procedures (previously submitted) and the guidelines <br />' established by the PHS/EHD and the Regional Water Quality Control Board <br /> The monitoring wells were sampled on September 15, 1995 Prior to sampling, all <br />' wells were gauged to the nearest hundredth of a foot and then purged of a <br /> minimum of three well volumes Groundwater temperature, pH and conductivity <br /> were monitored to ensure collection of a representative groundwater sample All <br />' purged water was stored on site in labeled drums pending future disposal <br /> Groundwater samples were collected from the monitoring wells using dedicated <br />' polyethylene bailers and were placed in appropriate sample containers Samples <br /> were labeled, documented on a chain-of-custody form, and stored 1n a cooler for <br /> transport to American Environmental Network (AEN), a state-certified laboratory <br /> located in Pleasant Hill, California Well gauging, purging and sampling data is <br /> presented in Appendix A. All groundwater samples were analyzed for total <br /> petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015 (5030/GCFID), and <br /> for benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA Method 8020. <br />' 4.0 QUARTERLY MONITORING RESULTS <br /> 4.1 Water Level Monitoring Data <br />' On September 15, 1995, the depth to groundwater ranged from 69 67 to 70 14 feet <br /> below top of casing Depth to water measurements and wellhead elevation data, <br /> used to estimate groundwater flow directions, are presented on Table 1 <br /> Groundwater elevation contours are shown on Figure 3 In the eastern portion of <br /> the site, groundwater flow was toward the west at an approximate gradient of 0 53% <br />' (0 0053 feet/foot). In the western portion of the site, groundwater flow was toward <br /> the south at an approximate gradient of 018% (0.0018 feet/foot) <br /> I <br /> D-102 3Q95 2 October 23, 1995 <br />