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' GeofoAua!?e0f _Y Inc Page 2 Well Installation Report Morita Brothers Project No 124 2 ' November 12, 1999 using a 2 0 inch modified California split spoon sampler All soil samples were sealed with ' Teflon sheets, capped with plastic end caps, labeled, and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol The OVM was used to screen the soil samples ' Details on the geology encountered during the completion of the soil sampling as well as the field observations are included in Section 3 2, Geology and Field Observations ' 2.1.2 Laboratory Analyses Soil Four soil samples from each borehole were submitted to Sherwood Laboratories of Hilmar, California(State Certified Laboratory#1400) for the following analysis • benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020 • gasoline-range petroleum hydrocarbons (TPH-G) by EPA method 8015(m) • methyl tertiary butyl ether (MTBE) by EPA method 8020 • The capillary fringe soil sample from each borehole was also tested for the oxygenated fuel compounds (MTBE, DIPE, ETBE, TAME and TBA) by EPA method 8260 A chain of custody was completed for all samples submitted and tracked to ensure sample integrity 2.2 Monitoring Well Installation To investigate the presence of gasoline-range petroleum hydrocarbons in the groundwater at this site, Geological Technics Inc installed two groundwater monitoring wells (MW-4 & MW-5) MW-4 was placed on the western side of the site against the fence and MW-5 was placed east of the site behind the building on the adjoining parcel (Figure 2, Site Map) I The monitoring wells were constructed using 2-inch diameter PVC casing with flush threads The table below shows the construction details The filter pack was surged during placement to insure maximum filter pack density Well o. la. Screen Slot Sand Packrans. ea rout Seal MW-4 211/50, - sand - I - - sand - - - A surface seal was achieved by pumping a neat cement grout via a tremae tube (augmented with <4% bentonite) to the surface The wells were secured with a locking watertight cap encased in flush mounted traffic-rated well box The new wells have been development and are scheduled for sampling in November 1999 A Imonitoring report will be prepared once the data has been received from the laboratory I3.0 RESULTS OF INVESTIGATION The analytical results and field observations are discussed below Tabular summaries of all analytical data are included in Appendix A, and the boring logs are included in Appendix B A site map with soil boring and monitoring well locations is included as Figure 2 I