ARCHIVED REPORTS_XR0010637 - Laserfiche WebLink

Home Browse Search

•, Table 1. Monitoring Wells Groundwater Data Well No Date Well Depth to Casing Water Floating Sampled Depth (ft) Water (ft) Elev ft# Elev ft Product MW-1 12/26/95 1700 870 4940 4070 None MW-1 3/28/96 1687 823 ----- 41.17 None MW-2 12/26/95 1874 955 5052 4097 None MW-2 3/28/95 1863 901 ----- 41.51 None MW-3 12/26/95 1667 9.05 4978 4073 None MW-3 3/28/95 1663 861 ----- 41 17 None Groundwater Gradient Groundwater elevation contours were plotted to a known datum from the measurements The groundwater flow direction was toward the north-northwest at sampling time A flow gradient of 0 006 was calculated Observed groundwater flow components typically vary from north- northeasterly to north-northwesterly Chemical Analysis and Results Priority Environmental Labs Inc tested the groundwater samples using EPA Methods 5030/ 8015 and 602 for Total Petroleum Hydrocarbons as Gasoline (TPHG), Benzene, Toluene, Ethylbenzene and Xylene (BTEX) The analytical results of the groundwater samples are listed below in Table 2 and complied in Table 3 Table 2 Groundwater Chemical Data Well No Date TPHG 8 T E X ----------------------- all ------ ug/I ----------------------- MW-1 3/28/96 34,000 51 20 34 50 MW-2 3/38/96 ND ND ND ND ND MW-3 3/28/96 ND ND ND ND ND ND- None detected ug/i - micrograms per liter. Discussion The concentrations reflect a slight decline of levels of TPHG and BTEX Some fluctuations in concentrations are attributed to percolation of winter precipitation through the soil strata in the immediate vicinity Concentrations in wells continue to show that contaminants are not detected in Wells MW-2 and MW-3 Concentration variations and their movement may have been also influenced by the recent precipitation However in Wright's opinion, concentrations . are expected to continue to a decreasing trend M & M Automotive Project No 4100-QM page 2