ARCHIVED REPORTS_XR0005273 - Laserfiche WebLink

Home Browse Search

r Department of Water Resources, 19671 . Therefore, it is highly unlikely the fuel components at this site have affected or will affect drinking water supplies. 2. 5 Proximity of private, municipal and irrigation wells: There is one supply well on the subject property. All water for the site, including sinks and restrooms in the office is supplied by the well. The location of the on-site well is shown on Figure 2. Well locations within a one--half mile radius of the site were requested from the Department of Water Resources. A well identified as 01N07E17M is located approximately 400 feet east of the project site. This well is screened from 144 to 176 feet below grade and is not expected to be affected by activities associated with this ' tank closure . ' 3.0 FIELD INVESTIGATION PHASE I 3. 1 Field Methods On June 15, 1990, WaterWork personnel advanced two angled soil borings (ASS-1, ASB-2) beneath the existing tank. The location and orientation of the borings are depicted on ' Figure 2. These borings were advanced at 45° from vertical and terminated beneath the longitudinal centerline of the tank approximately 5 feet beneath the tank bottom. Boring orientation, location, and length are shown on Figure 3. Drilling was conducted by Spectrum Exploration, Inc. (C57- 51-2289 ) using a hollow stem auger drill rig . A field geologist continuously logged all drill cuttings and core samples for characterization of contamination and soil type using the Unified Soil Classification System. Descriptions ' of soils encountered and sample collection intervals are included on boring logs (Appendix II ) . Soil samples were collected from the borings at five foot intervals along the ' boring length, beginning at ten feet. Soil samples and drill cuttings were monitored for organic vapors by placing a small amount of representative material in a sealed container, then measuring the concentration of volatiles collected in the head space of the container with a photoionization detector (PID) calibrated to an isobutylene standard. The values obtained at each measurement point ' were recorded on the boring logs. Select soil samples were submitted to Sequoia Analytical ( DHS Cert . #145 ) for laboratory analysis. Analyzed sample intervals are noted on ' the boring logs. Samples were collected, and transported under chain-of- custody in accordance with WaterWork ' s Soil Sampling Protocol (Appendix III ) . The samples were analyzed for BTEX, TPHG, EDB and organic lead by appropriate EPA and DHS 3