ARCHIVED REPORTS_XR0002153 - Laserfiche WebLink

Home Browse Search

Clavton MW-3 wa% installed at the %oulhwest coiner of tht- property adjaccrit to ,incl duwngtadic.itt of the former location of the UST(Ftgure 2) MW-1 wa% in%tallul of file northwest corner of the property to monitor a clie%el UST loL,ltell west of the Subject %de at Leprino Cheese Company MW-2 was installed at tht northeast corner of the property to complete the triangle so that groustdwater +low direction and gradient could be Ldh-ul,itee! Lit1101041cal log% recording the soil types underlying the site were maintained by Clayton s geologist Copies of these logs ate presented in Appendix D Soil Samples were taken at approximately 5 feet and 10 teet below the ground Surface (bgs) ;n all three boreholes Groundwater was first encountered at 13 feet bgs in MW-1, 8 feet bgs in MW-2, and 14 feet bgs in MW-3, although the water later rose a few Leet in MW-I and MW-3 Atter completing the boreholes, the auger was removed and 4-inch diameter wells installed to the following depths L.NUMBERJIDJEMTO WATER DEM OF W ,LL ft ti (ft MW-1 839 25 . EE W-2j __ 4 8 28 2f] W 3 10 77 25 Figures 3, 4, and 5 show schematic, well construction diagrams of the three installed monitonni wells Clayton marked the wells with ordnge stakes so that they can be easily found during future construction on the site Waste drill cutttng►s, as well as pu,r�ge water from well development and sampling, were placed into Department of f ransportation (DOT)-approved drums for proper disposal at a later date These drums were labeled with the name of the site, address, well number, and the drum contents and lett at the site 3.2 WELL DEVELOPMENT AND WATER SAMPLING Clayton surged and pumped the monitoring welts with a 4-inch submersible pump on April 4, 1990 This was done to stabilize the filter material and remove turbid water caused by drilling operations We removed approximately 75 gallon% (8 well volumes) from MW-1, 50 gdllons (65 well volume%) from MW-2, and 70 gallons (7 well volumes) from MW-3 MW-2 and MW-3 recovered slowly and were purged dry several times Tap water was added to these wells periodically to aid in development MW-1 recovered quickly and did not require any additional water We s,,nipled groundwater from the monitoring we11% on April b, 1990, in accardance with the protocols in Appendix B MW-1 and MW-2 were purged of 5 well volumes each MW-3 was purged dry twice and allowed to recover at least 80% before sampling The field data sheets of the purging/sampling are included as Appendix E -2-