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66,Wgrcaf Irrkn�rs Inc . & Page 3 <br /> Sail Groundwater invesngatwn Report <br /> George's Service <br /> Project No 425 2 <br /> November 30 1998 <br /> . Because every soil sample collected was not submitted for laboratory analysis, field- <br /> screening observation provided additional information as noted below <br /> 0 sediment type, especially grain size and clay content <br /> 0 moisture content <br /> o visible evidence of contamination, i e , color change due to reduction of iron or <br /> discoloration from hydrocarbons and other pollutants <br /> 0 the readings above background on a organic vapor meter (OVM) <br /> The OVM is a portable photo ionization detector that uses a 10 0 eV lamp to detect <br /> compounds with ionization potential below 10 0 eV (hydrocarbon range) <br /> Five soil samples (SM-105 30 5', MW-107 45 5', MW-202 50 5', 65 5', 80 5') were also <br /> tested for selected physical parameters These are summarized in Table 2 and the lab data <br /> attached in Appendix C The parameters tested for are listed below <br /> O Porosity <br /> Q Specific Gravity <br /> 0 Moisture <br /> o Dry Bulk Density <br /> 0 Permeability <br /> Details on the geology encountered during the completion of the sampling event as well as <br /> the field observations are included in Section 3 2, Geology and Field Observations <br /> 2.1.2 Soil Laboratory Analyses <br /> Based on field screening observations, two to four soil samples from each borehole were <br /> submitted to Sherwood Laboratones of Hilmar (State Certified Laboratory #1400) These <br /> samples were analyzed for <br /> Q benzene, toluene, ethylbenzene and xylene (BTEX by EPA method 8020) <br /> 0 gasoline range petroleum hydrocarbons (TPH-Gasoline by EPA method 8015(m)) <br /> o diesel range petroleum hydrocarbons (Total Extractable Petroleum Hydrocarbons, <br /> TEPH, Diesel, Kerosene and Motor Oil by EPA method 3540/8015m) <br /> The detection limits for these compounds are listed below A Chain of Custody was <br /> completed for all samples collected and tracked to ensure sample integrity <br /> Detection irnits t3 I EX MTBE j=-Gasoline <br /> of µ gI'VUQ 5,000 <br /> 2.2 Monitoring Well Installation <br /> To investigate the vertical definition of gasoline and diesel range petroleum hydrocarbons in <br /> the groundwater at this site, Geological Technics Inc installed two intermediate depth <br /> discretely screened, groundwater monitoring wells and one deeper, discretely screened, <br /> monitoring well on the edge of the former UST pit (Figure 2, Site Map) <br /> Intermediate Depth Wells <br /> The intermediate depth monitoring wells were constructed using 2 0-inch diameter PVC <br /> casing with flush threads The screened interval in MW-105 was 32 5 to 35 feet bgs and the <br /> screened interval in MW-107 was 47 to 49 5 feet bgs Groundwater was encountered at <br /> . approximately 7 to 8 feet below grade A #3 sand filter pack surrounded and extended two <br />