ARCHIVED REPORTS XR0003283 - Laserfiche WebLink

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A MA j%TC A S S e C I A T e S ! n C collected from MW-2, MW-4, MW-5, MW-6, or the facility well The distribution of PCE in groundwater is shown on Figure 5 TCE was not present above laboratory detection limits in the groundwater samples collected from MW 1 through MW9, FW, or the City of Stockton Municipal well WP-1 Potassium in the groundwater samples collected from MW 1 through MW9, FW and WP-1 ranged from 2 9 to 8 9 mg/L with MW3 being the highest Sodium in the groundwater samples collected from MW1 through MW9, FW and WP-1 ranged from 14 to 58 mg/L with MW3 being the highest Calcium in the groundwater samples collected from MWl through MW9, FW and WP-1 ranged from 18 to 380 mg/L with MW3 being the highest Chloride in the groundwater samples collected from MW 1 through MW9, FW and WP-1 ranged from 0 8 to 640 mg/L with MW3 being the highest Phosphorus in the groundwater samples collected from MW 1 through MW9, FW and WP-1 ranged from <0 1 to 1 4 mg/L with MW and MW2 being the highest Sulfate in the groundwater samples collected from MW1 through MW9, FW and WP-1 ranged from 10 to 83 mg/L with FW being the highest Hardness as a measure of calcium carbonate in the groundwater samples collected from MW 1 through MW9, FW and WP-1 ranged from 80 to 1,200 mg/L with the highest concentration detected in the groundwater sample collected from MW-3 Dissolved oxygen concentrations ranged from 0 83 mg/L to 9 66 mg/L with the highest concentration measured in MW-6 and the lowest in MW 1 Aluminum in the groundwater samples collected from MWl through MW9, FW and WP-1 ranged from <0 05 to 2 3 mg/L with MW7 being the highest Analytical results are summarized in Tables 2 and 3 Laboratory data sheets and chain-of- custody documentation are provided in Attachment 2 DISCUSSION AND CONCLUSIONS Based on a review of previous work performed at this site and the data presented in this report, it can be concluded that the groundwater gradient direction on July 13, 2004 is generally consistent with historical data The groundwater samples collected from monitoring wells MW I, MW2, MW4, MW5 and wells MW7 through MW9 contained concentrations of Cr +6 at levels above the laboratory method detection limit but below the California Primary MCL for total chromium Only the samples collected from wells MW-3 and MW-6 contained Cr+6 concentrations in excess of the California Primary MCL for total chromium The Cr +6 concentration in the samples collected from MW-3 and MW-6 increased slightly since the last monitoring event Cr +6 was not detected above the laboratory detection limit on July 13, 2004, in the water samples collected from the inactive facility well or the City of Stockton's inactive municipal well WP-1 s lenvironmental1625831quarterly\3gr-2004 dor, 3