ARCHIVED REPORTS_XR0009335 - Laserfiche WebLink

Home Browse Search

• • 1 vials All samples were labeled, placed in an ice chest, chilled on Blue Ice to 4° C, and transported to an ELAP-certified laboratory for analysis using appropriate chain-of-custody procedures ' The results of all current and previous groundwater soundings are summarized in Table 1 The average depth-to-water on October 22, 1999 was 11 36 feet below the top of the casing elevation of the ' three project monitoring wells At that time, the local direction of groundwater flow (utilizing elevation data from the monitoring wells) was calculated at approximately N40°W along a gradient of 0 024 foot/foot (equivalent to 24 feet of dip per 1000 feet of horizontal distance) (see ' Figure 2) ' TABLE 1 HISTORICAL GROUNDWATER SOUNDING DATA Site 3,Port of Stockton, San Joaquin County Well Date Depth To Casing-Top Water Table Avg. Flow Direction Number Sounded Water(Ft) Elevation (Ft) Elevation(Ft) & Gradient(Ftll~'t) MM3-1 07/09/99 11 10 935 -1 75 East Northeast ' A 0 004 ft/ft 10/22/99 1140 -205 North 40°degrees west A 0 0241t/ft MW3-2 07/09/99 1089 922 -167 10/22/99 11 80 -258 MW3-3 07/09/99 1039 8 74 -165 Mi 10/22/99 1088 1 -214 ' Well Sampling and Monitoring Logs are included as Appendix B Groundwater Sampling and Analyses Groundwater samples collected from the monitoring wells on October 22, 1999 and analyzed for Total ' Petroleum Hydrocarbons as gasoline (TPH-g) by EPA Modified Method 8015, aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEC constituents, as well as MTBE (Methyl tertButyl Ether)by EPA Method 8260 No gasoline as free product was observed in any well The results of all current and previous groundwater sampling analyses are summarized in Table 2 Precision Enviro-Tech laboratory report dated October 22, 1999 and chain-of-custody are included as ' Appendix B 1 .t 5fte3 C1W 99 aoc 4