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M 15 November 1995 AGE-NC Project No 95-0142 ' Page 5 of 19 - ' hydrochloric acid and transported to McCampbell Analytical, Inc (MAI) in Pacheco, California All samples were analyzed for TPH-g and BTE&X in accordance with EPA methods 5030 and 602, respectively 4 3 GROUND WATER FLOW DIRECTION AND GRADIENT ' The depth to groundwater at the site ranged from 39 23 feet to 40 13 in September 1995 The data eP 8r g p indicates an average decrease of ground water elevation of approximately 0 23 feet since May 1995 ' The ground water gradient was calculated to be 0 0125 ft/ft, in a northeasterly direction(N 57°E) The relative ground water elevations are listed in Table 2 ,The relative elevation of ground water is illustrated on Figure 3 ' 4 4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g were detected in ground water samples collected from MW-1, MW-2 and MW-3 dunng the September 1995 monitoring event at concentrations up to 3,200 ppb (MW-3) BTE&X were also detected in MW-1, MW-2 and MW-3 at concentrations up to 1,100 ppb (benzene, MW-3) No petroleum hydrocarbons were detected in the sample from MW-4 The analytical results of the ground water samples are summarized in Table 3 The laboratory report and chain-of-custody are included in Appendix E 5.0. - SOIL VAPOR EXTRACTION PILOT TEST 5 1 SOIL VAPOR EXTRACTION SYSTEM On 11 October 1995, an 8-hour soil vapor extraction (SVE) test was initiated at the site' This pilot test was performed to provide SVE data for initiation of a full scale remediation system The test was conducted using a VACLEEN 1000 SVE system, manufactured by Environmental Techniques The The VACLEEN unit consists of a positive-displacement blower, driven by an internal combustion f (IC) engine Propane was used as a!supplemental fuel source to start the engine and maintain optimum performance Hydrocarbon vapors are destructed as part of the internal combustion process Emissions from the engine are routed through two catalytic converters to maximize the destruction rate of the extracted hydrocarbon vapors 52 ' PILOT TEST PROCEDURES The test was vitiated at 8 00 am and continued for approximately 8 hours Well VE-1 was used for