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D <br /> I� <br /> i <br /> The four additional well, 01W-5 to My -B) were developed <br /> and sampled in February 1987. Nu free product or sheen <br /> was noted in any of the samples. Analysis of the ground <br /> water samples from the four monitori. ] 7.•ells showed <br /> detectable levels of total petroleum hydrocarbons ranging <br /> from 6.3 to 41.0 ppm. <br /> Monthly/OuarWater <br /> raTh.e eight monitoring wells were monitored and sampled on a <br /> r monthly basis beginning September 1987. Results of ground <br /> water level monitoring are presented in Table 1, while the <br /> results of ground water analysis are presented in Table 2. <br /> Free floating product was observed in MW-3, while dissolved <br /> gasoline constituents were detected in five of the wells <br /> (MW-4 to MW-8) . The last sampling event was performed by KEI <br /> in October 1988. <br /> GROUND WATER M014ITORING .AND SPYMLING - FEBRUARY 1990 <br /> As required by the Central Valley Regional Water Quality <br /> Control Board (RWQCB) , a ground water monitoring and sampling <br /> 1 program needs to be implemented as part of the investigation i <br /> t:a and remediation of subsurface contamination. The following <br /> section describes the conduct of .field activities and results <br /> of this monitoring and sampling event. <br /> Field Procedures <br /> y On February 15. 1990, Alton Geoscience monitored and sampled <br /> the ground water in Monitoring Wells MW-1 through <br /> MW-8, in accordance with the requirements and procedures of <br /> the Central. Valley Regional Water Quality Board (RWQCB) and <br /> San Joaquin County Public Health Services (SJCPHS) , Prior to <br /> purging the wells, water levels were measured in the wells <br /> t from the top of casing to the nearest 0.01 foot, using an <br /> electronic sounder. Ground water samples were collected with <br /> a hand bailer and observed for the presence of free product, <br /> sheen, a.•.: color. The water sampling forms are included in <br /> Attachment A. <br /> Water samples were collected after more than .4 casing volumes <br /> f iJ' of ground water were purged from each well, and stabilization <br /> of temperature, pH, and conductivity measurements was <br /> i , achieved. The samples were collected in clean Teflon bailers <br />