UAR/PROP 65 FILE 3 - Laserfiche WebLink

Home Browse Search

f CONESTOGA-ROVERS Mr. Michael Infurna & ASSOCIATES November 26, 2008 (referred to as stoichiometric demand) as well as the competing reactions. Soil samples collected A/ �1�— during the fust phase of injection well installations will be submitted a laboratory for completing the treatability study. The competing reactions are typically caused by the presence of natural i o" organic materials such as humates and fulvates, as well as reduced metal species. The Y " . , ✓� consumption of oxidants by these non-target compounds is defined as natural oxidant demand. The potential to mobilize metals such as arsenic, chromium, and bromide will be evaluated as { part of the bench-test. Injection Well Installations: Based on historical investigation data and experience with ISCO, twelve injections wells are proposed for the southern portion of the site to target the soil with i highest hydrocarbon levels. The twelve proposed injection wells will be installed to a depth of approximately 20 feet. Final well construction specifications will be determined in the field based on the nature of subsurface material encountered. The approximate locations of the proposed injection wells are presented on Figure 2. The twelve proposed wells will be screened from approximately 15 to 20 feet to target a sand and silty-sand layer. The injection wells will be constructed with 4-inch diameter, schedule 40, polyvinyl chloride 0.024nch Circumsloe screen and blank casing. The appropriate sand pack will be installed from approximately 2 feet above the perforated well casing interval to the total depth of the borings. Approximately 1 foot of bentonite will be placed above the sand pack, and a neat cement seal will be installed to near ground surface. A hollow stem auger will be used for drilling and construction of these injection wells. Soil samples collected during drilling will be used to describe the encountered soils and to screen in the field for hydrocarbons using a photo-ionization detector. Soil cuttings will be stored on site in 55-gallon drums. Samples of the cuttings will be submitted for laboratory analysis to profile the cuttings for disposal. This material will be properly disposed of based on the results of the laboratory analysis. As previous discussed, samples will also be collected and for conducting the bench-scale treatability study. Utility Locations: CRA will notify Underground Service Alert (USA) of the proposed drilling activities. USA will have the utilities in the vicinity identified. Additionally, a private utility locator will be used to identify subsurface utilities at the drilling locations. Permits: CRA will obtain necessary drilling permits from EHD. Site Health and Safety Plan: CRA will prepare a comprehensive site health and safety plan to protect site workers. The plan will be reviewed and signed by each site worker and kept on site during field activities. 240783Mass 5 Worldwide Engineering, Environmental, Construction, and IT Ssrvtces