ARCHIVED REPORTS_XR0012692 - Laserfiche WebLink

Home Browse Search

0-WE S PROBLEM ASSESSMENT REPORT Moore Petroleun, Inc. 5941 F Street, Banta, CA NSA Project No. 10-90-481 Page 3 2.2 Summary of Previous Work _. Previous work performed at the site includes investigations performed by Earth Treatment Systems Environmental (ETS) in August, 1988, and Delta Environmental Consultants, Inc. (Delta) in May, _ 1989. Work completed by ETS included the drilling of one soil boring, collection of two soil samples for laboratory analysis, installation of one monitoring well (MW-1) , and completion of a report titled Environmental Preliminary site Assessment. Work completed by Delta at the site included the drilling of two soil borings, completion of two monitoring wells (MW-2 and MW-3) , collection of sail and ground-water samples for laboratory analysis, determination of the direction and velocity of ground- water flow, and the issuance of a report titled Preliminary Hydrogeologic Assessment Report. Recommendations made by Delta for further investigative work at the site have included the following: r, • Installation of three additional monitoring wells. • Collection of soil samples during drilling of the additional monitoring wells, collection of ground-water samples from all monitoring wells, and submittal of selected soil and all ground-water samples to a California-certified laboratoryto be analyzed for BTEX, EDC, EDB, and TPH. o Collection of water level data from all wells and preparation of a ground water elevation map. These recommendations have been incorporated into the work recently completed at the site. The results will be discussed in the following sections. 3.0 RESULTS OF RECENT INVESTIGATION ACTIVITIES 3.1 Drilling and Soil SamBlin— On .Tune 11, and 12, 1990, a representative of Nations Groundwater Associates (NGA) supervised the drilling of three soil borings at the site. Soil borings were advanced using a CME-55 drilling rig utilizing 8-inch-diameter hollow stem augers. All soil borings were advanced to a depth of approximately 25 feet. Samples of subsurface soils were obtained from each soil boring at five foot intervals using a California modified split-spoon sampler. All soil samples were examined in the field by a California Registered Geologist and described for color, grain _size, moisture content, mineral content,.._and.-_odor.--Soil--samples- - were classified zn accordance with the Unified Soil Classification System. Soil boring logs are presented in Appendix A. A a..