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1 <br /> summarized in WaterWork's "Preliminary Assessment Report" dated January 12, 1990 Due <br /> 6, to the presence of elevated levels of hydrocarbons beneath the three tanks, the San Joaquin <br /> County Public Health Services, Environmental Health Division (PHS/EHD) requested <br />' additional work be performed at the site <br />' 23 Monitoring Well Installation and Sampling <br /> Five soil borings (B1 through B5) were drilled at the site between February 11 to 14, 1994 <br /> Borings 131 through B4 were completed as groundwater monitoring wells NNW-1 through <br /> MW-4, respectively A total of twenty-two soil samples were analyzed by Sparger <br /> Technology, Inc (STI) for total petroleum hydrocarbons (TPH) as gasoline and diesel, and <br />' volatile aromatics (BTE&X) The analytical results of the soil samples are summarized in <br /> Table 1 <br />' Groundwater samples were collected from each well on February 22, 1994 No free product <br /> was encountered The samples were analyzed for TPH as gasoline and diesel and BTE&X <br /> by STI TPH as gasoline and BTE&X were detected in each Nell, TPH as diesel was <br />' detected in MW-4 The analytical results of all groundwater samples are summarized in <br /> Table 4 <br />' 3 0 PROCEDURES <br /> 3.1 Monitoring Well Purge Procedures <br /> On December 14, 1994, the depth to water in each monitoring N%ell xNas measuied relative <br />' to the top of the casing using a Soliiist water level ineter (Table 3) PVC baileis 'vele used <br /> to remove between seven and ten gallons of water from each «ell to stabilize temperature, <br /> PH, and the conductivity Well parameters were measured at one-gallon intervals using an <br /> ICM Water Analyzer (Appendix A) The purge water was stored in 55-gallon DOT- <br /> approved drums at the site <br />' 3.2 Sample Collection and Laboratory Analysis <br />' After stabilization, water samples wei e collected using disposable plastic bailers Samples <br /> from each well were placed in 40-mI vials An additional sample from MW-4 was collected <br /> and placed in a 1-L amber bottle All samples were placed in a chilled container and <br /> transported to Pan-Agricultural Enviionmental Labs, Inc in Madera, California Each <br /> sample was analyzed for TPH as gasoline and BTE&X in accordance with EPA methods <br /> 5030/8015m and 602, respectively The additional sample from MW-4 was analyzed for TPH <br /> as diesel in accordance with EPA method 8015m <br /> G"I.S aI Audi 5c Inc 4 <br /> Leery.A.m hepar qM7"A17 5 <br />