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I <br /> - CLEARWATER <br /> • G R O U P I A C <br /> IA workplan for the implementation of RESNA's recommendations ons was prepared by <br /> Clearwater and approved by the San Joaquin County Public Health Services/ <br />' Environmental Health Division (PHS/EHD) A modification of the original plan <br /> was recommended In this workplan, the modification consisted of the installation <br /> of two additional vapor extraction wells in the vicinity of the former gasoline <br />' dispenser island The additional vapor extraction wells (VW-4 and VW-5) were <br /> installed in late 1994 and the soil vapor extraction system was installed in February <br />' 1995 An assessment of the utility of the original three vapor extraction wells (VW- <br /> 1 <br /> VW- <br /> 1 through VW-3) was to be made following system start-up <br /> 3.0 QUARTERLY FIELD ACTIVITIES <br /> All work completed this quarter was performed in accordance with Clearwater Field <br /> Procedures which have been previously submitted and under the directives and <br /> guidelines established by the PHS/EHD and the Regional Water Quality Control <br /> Board <br /> The groundwater monitoring wells were sampled on June 22, 1995 Prior to <br /> sampling, all wells were gauged to the nearest hundredth of a foot and then purged <br /> of a minimum of three saturated well volumes. Groundwater temperature, pH and <br /> conductivity were monitored to ensure collection of a representative groundwater <br />' sample. All purged water was stored on site in labeled drums pending future <br /> disposal <br /> Groundwater samples, collected from the monitoring wells using dedicated <br /> polyethylene bailers, were placed in appropriate sample containers. Samples were <br /> labeled, documented on a chain-of-custody form, and stored in a cooler for transport <br />' to American Environmental Network (AEN), a state-certified laboratory located in <br /> Pleasant Hill, California Well gauging, purging and sampling data is presented in <br /> Appendix A. All groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg) by EPA Method 8015 (5030/GCFID), and for <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX) by modified EPA Method <br />' 8020. <br /> 4.0 QUARTERLY MONITORING RESULTS <br /> 4.1 Water Level Monitoring Data <br /> On June 22, 1995, the depth to ground water ranged from 68 24 to 68.72 feet below top <br /> of casing Estimation of the groundwater flow direction indicates groundwater <br />' depression in the vicinity of MW-1 In the eastern portion of the site, groundwater <br /> D-102 1Q95 2 August 31,1995 <br /> I <br />