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m <br /> ON <br /> ,- <br /> �. Chevron/S. El Dorado 14 <br /> August 1990 <br /> GROUNDWATER KOh-ITORING AND SAMPLING <br /> YThe three monitoring ,cells were professionally surveyed to a <br /> common datum on August 21, _q90, to determine locations and well- <br /> head elevations. The wells were monitored on August 20, 1990, <br /> prior to development anL1 sampling, using an ORS Environmental <br /> Equipment Interface Probe to establish groundwater elevation and <br /> -' to check for separate-phase hydrocarbons. No separate-phase <br /> hydrocarbons were detected in the wells. A summary of the sw"rvey <br /> and monitoring data is presented in Table 2. <br /> TABLE 2 <br /> HELL SURVEY AND GROUNDWATER <br /> MONITORING DATA <br /> A. WELL WELLHEAD DEPTH-TO HYDROSTATIC h <br /> I.D. ELEVATION GROUNDWATER ELEVATIONS <br /> .1 MW-1 11.66 40.59 -28.93 <br /> r . I4W-2 12.09 40-81 -18.72 <br /> MW-3 11.91 39.41 -27.50 <br /> Note: mean sea level (msl) <br /> - Groundwater samples were collected on August 20, 1990, after <br /> well development. Groundwater samples were collected with an <br /> EPA-approved Teflon sampler. Groundwater samples for BTEX and <br /> TPH-as-gasoline were placed in 40-milliliter (ml) glass vials, <br /> acidified to ensure a pH below 2.0, then sealed with TeflonR <br /> septa caps. Additional samples were collected from the well <br /> located adjacent to the waste-oil tank (:KW-1) to be analyzed for <br /> TPH-as-diesel, TOG, TPH-as-waste-oil, and for the presence of <br /> cadmium (Cd) , chromit►m (Cr) , lead (Pb) , and zine (Zn) . All <br /> -samples-were-labeled,--plated-on-ice_in--an_insulated cooler and - T <br /> transported under Chain-of-Custody Manifest to the GTEL facility <br /> GROUNDWATER <br /> TEcti.NoLOG4,INC. <br />