WORK PLANS_FILE 2 - Laserfiche WebLink

Home Browse Search

4.0 SITE ACCESS Prior to commencing fieldwork, Environmental Remediation Group (ERG)will communicate with property owners to discuss the proposed scope of work, obtain permission and access agreements, and to address any concerns that the individuals may have regarding this additional assessment. 5.0 MONITORING WELL CONSTRUCTION ERG proposes to install four groundwater monitoring wells (MW-12 through 15) and an additional two groundwater monitoring wells (MW-16 and MW-17) if further definition of the plume is needed. All wells will be constructed of 2-inch diameter polyvinyl chloride (PVC) casing with 0.02 inch slot size and#2 Monterey Sand. Each well will be ND sealed to the surface using bentonite pellets with a 2-foot concrete cap and traffic-rated well vault. Wells will be installed using a truck-mounted drilling rig with a continuous flight, hollow-stem auger. The augers will be steam cleaned prior to drilling each boring. Well screen construction and well depth vary with each well based on its location and purpose. Well screens will not exceed 20 feet in length. The details for each well are indicated below and are shown in the attached well diagrams (Figure 4). • Well MW-12 will be installed to intercept Sand C. Sand C is located betweerL.5,4.. and 65 feet bgs.and is between 15-to 25-feet thick. The proposed screen interval for this well is 65 to 85 feet below ground surface (bgs) based on the cross sections preparey tratus Environmental, Inc. The actual screen interval and total well depth will be determined in the field based on soil lithology and well r—P, logging results. The well will be constructed of 2-inch diameter polyvinyl chloride (PVC) casing inside an 8-inch diameter borehole. • Well MW-13 will be installed as a well cluster with two separate wells (MW- c P 1 3 13AB and MW-13C). Well MW-13A/B will be screened from approximately 5 .7 ' to 25 feet bgs to intercept Sand A and Sand B. Well MW-13C will be installed to p -. intercept Sand C with a proposed screen interval of 65 to 80 feet bgs based on the cross sections prepared by Stratus Environmental, Inc. '17re actual screen interval 5° ` and total well depth will be determined in the field based on soil lithology and L well logging results. The wells will be constructed of 2-inch diameter polyvinyl chloride (PVC) casing inside an 8-inch diameter borehole. • Wells MW-14 and MW-15 will each be completed as a well cluster with two separate wells (MW-14A, MW-14B and MW-15A, MW-1513). These wells have P ` been segregated into two separate screen intervals to avoid any possible cross contamination that could occur between the two sand layers in the event that there is no intersect between the layers in this area. Based on the cross sections prepared b Stratus Environmental, Inc., the proposed screen intervals for these wells is approximately 5 to 20 feet bgs.fo>;SandA and 35 tQ_45 feet.bg&for.SaiW B. The actual screen interval and total well depth will be determined in the field based on soil lithology and well logging results. The wells will be constructed of G,� 2-inch diameter polyvinyl chloride (PVC) casing inside an 8-inch diameter 7�ty borehole. ; Environmental Remediation Group Page 5 Site Assessment Work Plan Project No.0406 Joe's Travel Plaza