SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

i 5 i Ms. Linda Turkatte March 14, 1996 Page 2 Additional attempts to sample groundwater in April 1992 and March 1993 were unsuccessful because the groundwater level had dropped below the bottom of the well. On May 3-5, 1993, three soil borings (MW2, MW3, and MW4) were drilled by RESNA Industries, Inc. to depths of approximately 91 feet below grade. The borings were subsequently converted to groundwater monitoring wells. No petroleum hydrocarbon constituents were detected in any soil or groundwater samples collected from these wells. Groundwater, samples collected_ from all-site wells (including,MW1) on May 25, 1995 were below method detection limits for gasoline hydrocarbons. Groundwater currently exists at approximately '10 feet below ground surface. Ground Zero submitted a request for closure in a letter dated December 14, 1995. PROPOSED SCOPE OF WORK A subsurface site investigation will be performed to verify current soil and groundwater conditions beneath the site. The investigation will consist of drilling and sampling one soil boring and collecting a groundwater sample from monitoring well MW 1. All field activities will be conducted in accordance with the Site Safety Plan prepared by RESNA Industries Inc. submitted in March 1993 The field investigation will be conducted under the supervision of a California Registered Geologist. i Soil Sampling and Analysis The proposed soil boring location is approximately five feet northwest of MW L A site plan showing Y the proposed boring location is presented on Figure 2. The boring will be advanced to approximately_ 50 feet below ground surface using a drilling rig with 8-"inch or 6-inch diameter continuous-flight, hollow-stem augers. Drilling will be conducted by Spectrum Exploration, Inc. (C57-512268). , i Drill cuttings will be logged continuously for characterization of contamination and soil type by a geologist using the Unified Soil Classification System. Descriptions of soil types encountered will be recorded on a boring log and included in the summary report. The boring will be sampled at 5-foot depth intervals using a split-spoon sampler with three brass liners. The materials from one sample liner in each sampling interval will be described and field screened with a photoionization detector (PID) for volatile organic content. A second liner from selected sampling I gr0undze\hendrix\wp0396.jp1 I