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Working To Restore Nature <br /> Groundwater samples were collected from monitoring wells MW1 and MW6, from influent <br /> well MW4 (TVGT-TNF) and from the effluent ports (EFF-1 C and EFF-2C) on June 21, 1994 <br /> after stabilization of pH, electrical conductivity (EC) and temperature The monitoring wells <br /> were purged using an above-ground centrifugal pump with dedicated tubing Well purge logs <br /> are included in Attachment A Samples were analyzed for benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHg) by EPA methods <br /> 8020 and modified 8015, respectively <br /> ANALYTICAL RESULTS <br /> No dissolved gasoline hydrocarbon constituents were reported at or above detection limits in <br /> monitoring wells MW 1 or MW6 Laboratory data are summarized in Table 2 <br /> Analytical results indicate a general decrease in TPHg and BTEX concentrations in the <br /> influent sample collected during this sampling round The sample collected from carbon filter <br /> 1 (EFF1C) contained benzene (1 2 ppb) Petroleum hydrocarbon analytes were not present <br /> in the sample collected from carbon filter 2 (EFF2C) Influent BTEX and TPHg <br /> concentrations over time are plotted on Figures 5 and 6 <br /> . Laboratory analyses were performed by Sequoia Analytical Laboratory (ELAP No 1210) <br /> The analytical results are summarized in Table 2, the laboratory reports and chain of custody <br /> documentation are presented in Attachment B <br /> REMEDIATION SYSTEM PERFORMANCE <br /> The system was down on only one occasion during the quarter On June 21, 1994 upon <br /> arrival at the site the system was down due to an electrical surge which tapped the breaker <br /> A flow meter was installed during the quarter and system maintenance and repair was <br /> conducted on several occasions <br /> On April 5 the system was operating at 0 75 Ppm when the technician arrived at the site <br /> The compressor was drained and the system lines and pump were cleaned The system was <br /> restarted at a rate of 3 5 Ppm <br /> On April 12 the system was operating at 3 5 Ppm upon arrival at the site Repairs were <br /> completed on wells MW 1 and MW2 and the street grade christy box on well MW2 was <br /> replaced Both wells were resurveyed after repair work had been completed <br /> On April 15 a flowmeter was installed at the site The initial meter reading was 32 7 gallons <br /> �I 1521021QRTLYI2QR-1994 FNL 2 <br />