ARCHIVED REPORTS XR0003282 - Laserfiche WebLink

Home Browse Search

CvvATC A 5 S O C 1 A 7 E 5 I N C TCE was not present above laboratory detection limits in the groundwater samples collected from M W-I through MW-9, or FW Potassium in the groundwater samples collected from wells MW-1 through MW-9, and FW ranged from 6 8 to 19 0 mg/L with MW-5 being the highest Sodium in the groundwater samples collected from wells MW-1 through MW-9, and FW ranged from 36 to 67 mg/L with MW3 being the highest Chloride in the groundwater samples collected from wells MW-1 through MW-9, and FW ranged from 21 to 740 mg/L with MW-3 being the highest Phosphorus in the groundwater samples collected from wells MW-1 through MW-9, and PW ranged from 0 82 to 2 2 mg/L with MW-7 being the highest Sulfate in the groundwater samples collected from wells MW-1 through MW-9, and FW ranged from 9 to 90 mg/L with MW-5 being the highest Hardness as a measure of calcium carbonate in the groundwater samples collected from wells MW-1 through MW-9, and FW ranged from 330 to 1,500 mg/L with the highest concentration detected to the groundwater sample collected from MW-3 Dissolved oxygen concentrations ranged from 1 08 mg/L to 8 61 mg/L with the highest concentration measured to MW-3 and the lowest in MW-1 Aluminum in the groundwater samples collected from MW-I through MW-9, and FW ranged from <0 120 to 20 000 mg/L with MW-5 being the highest Analytical results are summarized in Tables 2 and 3 Laboratory data sheets and cham-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 October 19, 2004 is generally consistent with historical data The groundwater samples collected from monitoring wells MW-1, MW-2, MW-4, MW-5 and wells MW-7 through MW-9 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 since the Iast monitoring event Cr +6 was not detected above the laboratory detection limit on October 19, 2004, in the water sample collected from the inactive facility well s lenvironmentaIN62583Iquarterlyl4gr-2004 doe 3