ARCHIVED REPORTS_XR0011970 - Laserfiche WebLink

Home Browse Search

f Additional Soil-and Groundwater Investigation and Monitor Well Installation Report CSUS Multi-Campus Regional Center January 11,2002 Liirrr¢ u Page 11 yf Table 4 Monitor Well Groundwater Sample Analytical Results Sample Number 3024-MW1-12118101 3024-MW2-12/18/01 3024-MW3-12118101 i` Anal to Units 1 y g1L ggIL µg/L Benzene <0 5 0.5 2.8 I ;Toluene 0.6 1.0 1.4 Ethylbenzene <0.5 <0.5 1-6 Total Xylenes <L0 <1.0 4.5 TPH-G <50 150 210 TPH-D <50 <50 <50 TPH-MO <500 <500 <500 TPH-K <250 <250 . <250 MTBE <0.5 <0.5 82 Ethanol <13 <13 <13 Tertiary-Butanol <5.0 <5.0 54 t Di-isopropyl Ether <0,5 <0.5 <0.5 Ethyl tertiary-Butyl Ether <0.5 <0.5 <0.5 Tert-Amyl methyl Ether <0.5 <0.5 <0.5 1,2-Dichloroethane <0.5 4.3 71 1,2-Dibrornoethane <0,5 <0.'5 <0.5 Unit Conversions: pg/L:parts per billion(ppb) Analytical TPH-G=total petroleum hydrocarbons,quantified as gasoline: TPH-D=total petroleum hydrocarbons,quantified as diesel. TPH-MO=total petroleum hydrocarbons,quantified as motor oil. TPH-K=total petroleum hydrocarbons,quantified as kerosene. MTBE-methyl tert-butyl ether 5.3 GROUNDWATER GRADIENT. On December 18, 2001 the depth to groundwater was measured in monitor wells MW-1, MW-2;MW-3. Groundwater elevation data is presented in Table 5'. The average depth to groundwater in.the monitor wells was approximately 37.5 feet below the surveyed well collar measuring points (the measuring "oints P are slightly below the ground surface). The estimated groundwater gradient for the site on December 18, 2001 was 0,0021 ft/ft to the east and is shown in Figure 5,Appendix A,- u Table 5 Groundwater Elevation Data Monitor Well TOC Elevation Depth to Groundwater Groundwater Elevation t 1 MW-I 17.42 . 37,56 .-2. 0.14 MW-2 17.59 r 37.64 -20.05 -MM W3 I7.16 37.38 -20.22 All measurements are in feet. * TOC=Top of Casing. f TOC Elevation:referenced relative to NGS Benchmark HS4399. 6.0 SENSITIVE RECEPTOR SURVEY Condor conducted a sensitive receptor,.survey within a 2,000-foot radius of the site(study area)to identify potential areas of groundwater recharge or discharge (surface water bodies), schools, and potential water Well users that could be impacted.by migration of groundwater from the site. The sensitive receptor survey consisted of inquiries to the California Department of Water Resources (DWR) Central District in Sacramento, California, contacting public water purveyors,visually inspecting the area within 500 feet of the site, and interviewing residents located in the site vicinity. DWR well records were cross-referenced with Assessor's Parcel Maps and city street maps. This process helped identify well records pertaining to wells estimated to be within the study area. DWR well records may include the well owner's name, awell location map,the address where the well is located,and a log of the well. rs , is - •� CONDOR