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IGeolagtcaC?ecFraus 2nc Page 3 soil& Groundwater Investigation Report Ted Peters-UST Project 1 2 Novemberer 3,, I999 IA chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing a means to track their movement and insure their ' integrity 2.1.3 Laboratory Analyses ' Soil Based on field screening observations, two to three soil samples from each borehole were submitted to BSK Laboratories of Fresno (State Certified Laboratory #1180) for analysis of • benzene, toluene, ethylbenzene and xylene (BTEX by EPA method 8020), ' • the fuel oxygenate suite (MTBE, DIPE, ETBE, TAME & TBA by EPA method 8260) • gasoline range petroleum hydrocarbons (TPH-G by EPA method 8015(m)) • TTLC-Lead ' The detection limits for these compounds are listed below A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity Detection Limits ersof - - ea µg g , ' Groundwater The two hydropunch water samples were submitted to BSK Laboratories of Fresno (State Certified Laboratory #1180) for analysis of • benzene, toluene, ethylbenzene and xylene (BTEX by EPA method 8020), • the fuel oxygenate suite (MTBE, DIPE, ETBE, TAME & TBA by EPA method 8260) • gasoline range petroleum hydrocarbons (TPH-G by EPA method 8015(m)) • Total Lead ' The detection limits for these compounds are listed below A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity ' etection Limits —Ethers Lead Water µg ' 2.2 Monitoring Well Installation To investigate the lateral definition of gasoline range petroleum hydrocarbons in the ' groundwater at this site, Geological Technics Inc installed three water table groundwater monitoring wells One in the center, one to the north and one to the east of the former UST (Figure 2, Site Map) ' The monitoring wells were constructed using 2 0-inch diameter PVC casing with flush threads The screened intervals extended from five feet above the water table to ten feet below the water table Groundwater was encountered at approximately 9 to 10 feet bgs A ' #12 sand filter pack surrounded and extended one foot above the 0 010 inch screened interval and was topped by a two foot bentonite chip transition seal installed on top of the filter pack and hydrated A surface seal was achieved by pumping a neat cement grout (augmented with <4% bentonite) on top of the transition seal The wells were secured with locking watertight caps encased in flush mounted traffic rated well boxes 1