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12 August 1996 <br /> AGE-NC Project No 95-0142 <br /> ' Page 2 of 4 , <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new, clean disposable plastic bailers <br />' Immediately upon retrieval, the samples were transferred into 40-m1 VOA vials containing <br /> hydrochloric acid as a preservative, and were transported to McCampbell Analytical, Inc (MAI) in <br /> Pacheco, California All samples were analyzed for total petroleum hydrocarbons quantified as <br /> gasoline (TPI -g), volatile aromatics (benzene, toluene, ethyl benzene and xylenes BTE&X) and <br /> methyl-tert-butyl ether (MTBE) in accordance with EPA,methods 801515030, 602 and 602 <br /> 23 COLLECTION OF PURGED WATER SAMPLES <br /> Two drums of purged water are present on-site At the request of Stockton Plating, one sample was <br /> collected from each drum for disposal characterization The samples were collected using a <br /> disposable plastic bailer One 40-m1 VOA vial of water was collected from each drum The samples <br /> were labeled and transported under chain-of-custody to MAI for analysis Each sample was analyzed <br /> for TPH-g and BTE&X in accordance with EPA methods 5030/8015 and 602, respectively <br /> 3 0. FINDINGS <br /> 3 1 GROUND WATER GRADIENT AND DIRECTION <br />' The depth to ground water at the site ranged from 34 24 feet to 34 96 feet The data indicates an <br /> average increase of ground water elevation of nearly one foot since March 1996 Ground water flow <br /> direction is northeast to east During the June 1996 monitoring, the gradient was approximately <br /> 0 012 ft/ft at the west end of the site and becomes more shallow (0 006 ft/ft) towards the east end <br /> of the site The relative elevation of ground water is illustrated on Figure 3 - Relative Ground Water <br />' Elevation <br />' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in each well sampled at concentrations up to 220,000,ug/l (micrograms per liter <br />' or parts per billion ppb, VW-1) BTE&X were detected in samples from VW-1 at concentrations <br /> up to 46,000 ppb (toluene,VW-I) MTBE was detected in samples from MW-4, VW-1 and VW-2 <br /> at concentrations up to 850 ppb (VW-1) Analytical results of the ground water samples are <br />' summarized in Table 2 The laboratory report (MAI Laboratory I D Nos 65623 through 65627) <br /> and chain-of custody are included in Appendix B <br />