ARCHIVED REPORTS XR0001828 - Laserfiche WebLink

Home Browse Search

' Data Provided with this Re ort Regional Site Location Map(Figure 1) ' Topographic Map of Site(Figure 2) Site Activity Map(Figure 3) Map Depicting Groundwater Flow Direction(Figure 4) ' Hydrograph of Monitoring Well PT-MW 1 with Benzene and 1,2-DCA Concentrations(Figure 5) Monitoring Well Sounding Data(Table 1) Summary of Monitoring Well Soundmg Data (Table 2) ' Summary of Water Sample Analytical Results(Table 3) Summary of Individual Monitoring Well Water Sample Results (Table 4) ' Appendix I- Groundwater Monitoring Procedures Appendix 2- Groundwater Monitoring Well Data Logs ' 2.0 GROUNDWATER MONITORING AND SAMPLING ' 221 Groundwater Monitonng Groundwater monitoring wells for the 521 North Cherokee Lane (former Parmar Texaco site)were monitored on September 30, 2004 The locations of the monitoring well are depicted on both Figures 3 I and 4 All well monitoring and sampling was conducted in accordance with the monitoring procedures outlined in the attached Appendix 1 and by verbal directives issued by PHSEHD The wells were initially inspected for integrity and general maintenance condition with the findings reported on the Monitoring Well Data Sheets presented in Appendix 2 The wells were then probed for depth to the groundwater surface and depth to bottom of each well Initially,the depth to water surface was measured by an electronic water level indicator that allowed measurement of depth to approximately 0 01 foot These water surface depths for each well were then recorded on the individual monitoring well data sheets contained in Appendix 2 After depth to water was determined, a clear, acrylic bailer was used to inspect visually an undisturbed sample from the top of the water column to determine if a product layer or sheen was present A pronounced sheen and product layer was visible on the tape and the bailers used to sample monitoring wells MW I, 2, and 3 These wells had a slight free-product layer of approximately 0 005 foot thickness All other wells had no reported petroleum hydrocarbon odor or sheen on the water surface The water level indicator was then used with a weight to measure the total depth of each monitoring well in order to determine the volume of water in each well casing volume These measurements and the calculated well casing volume for each well were recorded to Appendix 2 Each of the wells was then purged with a low-purge rate submersible electric water pump or hand bailed using a disposable batter Groundwater electrical conductivity, pH and temperature were all recorded as each casing volume of water was removed from the wellbore Data was recorded on the Monitoring Well Data Sheets Groundwater monitoring results are tabulated in Tables 1 and 2 Once the groundwater parameters were stabilized a water sample was collected I MamlDlEnvimnmenfa[NPanrLarTexacx,IRgmrts1093004QMR wpd 2