WORK PLANS - Laserfiche WebLink

Home Browse Search

SHID4507rs�Waste Work Me Mussys 2.0 Waste Characterization Design Statistically significant. Increasing wncentratlom of TEE In groundwater at SHAD-CO] & IXB suggest that a limited amount of residual TEE course may exist In the area of the MW505 well cluster. The statistically significant increasingtrend inWinconountratbns in mondomgvrellMW505CmwindicaethemisaTCEmass that our current conceptual hydregeolegic model does not account for, which may lengthen deamptimers. TheTc groundwatermay also beg oughtn semarm school,,or danycare facility were s Inhthe Mum. Additional charactesnuration of the she is to constructed Mill dam to determine the full extent of groundwater contamination and reach a section on the need for(inure anivdies at the see. 2.1 Groundwater Sampling Locations Initially, groundwater samples will be mllected mom eight done penetrometer and hydropuncb boring locations (Figure 5). The analytical results from the Initial samples will be evaluated to determine eight stepout sample bmtions. At each returning locartion, a single boring will be advanced using core penetrometer technology (Cpn/Hydopundl methods by the procedures described In the Eornprehemiw Field Work Earn (ORS, 016b). Each boring location will be hand angered to a depth of 5 If figs, Each boringwill be advanoed in five Intervals, to allow for the selection of five groundwaterfoul to fo ft lo he logs. T sampling Interval was established based min the review of historical waterqualify data In and around the FAVISGS Ismil duster and based on the evaluation of statistically Increasing trends of TEE mncentratimm overtime In M WSTIC (C moot. 2.2 Sampling Design Thewase charaterintionat SHADUO] 8 -008will mommucted northwest aSM1amewithin and around the M W5o5well duster (Figure 5). Five groundwater samples will W collected between Wand 140g logs from eight locations. Samples will be collected at E0, 80, 100, 120, and 140 IT logs at each sample low unless field observationsIndia otherw aed high tan:missw" "layers in three of the hydroostratigrapM1e zones (Aldo, and q and at the overbansmissisufty, cones at the impact between A/B add 6/Czones in the vicinity of the MW505 well cluster. Sipecifically, one ample will be regarded at approximately 40 it logs in the A Zone, one sample from 60 to 90 R by; in the B Zone, one sample from 90 to 10IT logs in the C Zane, and one sample each at the Aye and B/Czone contacts. Additionally, the waste characterization at SHAD OmIs -(NOT will be conducted to determine the need for a p sampling, to ss me extent of groundwater comamaHn, and whether further action row red t m edWe n the groundwater. If further action In results of the waste characterization w Il bemused to evaluate me lumber, appropriate activities at the site. The following decision miss will d a be applie groundwater samples: • If groundwater sample TCE concentrations from the initial eight sample locations are lower than the allion level (Table 1), n med. groundwater sample TEE concentrationsare nigher than the action level (Table 1), sepaut sampling Is ssary.The step out ample lecati will be locatedapproximately 50 to 100 feet from the Initial sample locations where TEE concentrations were above the action level.