ARCHIVED REPORTS_XR0002166 - Laserfiche WebLink

Home Browse Search

5431 Grant Line Road, Banta, California August 2, 1994 . Chevron USA Products Company page 4 Photo-ionization detector (PID) One sample from each 5-foot interval was sealed with aluminum foil, capped, taped, labeled, placed on ice in an insulated container, and delivered under chain-of-custody manifest to Superior Precision Analytical, Inc (Superior), in San Francisco, California The field geologist maintained a complete log of the materials encountered during drilling using the Unified Sod Classification System (Appendix B) Six of the eight soil samples collected from the borings were selected for laboratory analysis Each sample was analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum hydrocarbons-as-gasoline (TPH-G) by Environmental Protection Agency (EPA) methods 5030/8020/modified 8015 3,4 Groundwater Monitoring Well Installation Groundwater monitoring wells MW-2 and MW-3 were installed near the locations of temporary groundwater monitoring wells TW-1 and TW-2, respectively (Figure 2) The monitoring wells were constructed of 2-inch-diameter, schedule 40 PVC casing and 0 020-inch-slot well screen Well screen for both wells was installed from 5 to 20 feet BGS A sand filter pack was placed in the well annulus from the bottom of the borehole to 1 foot above the top of the well screen The wells were sealed with one foot of bentonite placed on top of the sand and a neat cement grout to the surface Wellheads are secured by a locking, expandable well cap and a water-tight, bolted street box set in concrete Well construction details are presented in the drill logs attached in Appendix B After installation, the wells were developed by manual bailing Approximately 20 gallons of water was removed from each well and stored on site in DOT-approved drums The wells were professionally surveyed for both horizontal position and elevation above mean sea level (Appendix C) The survey data will be used in conjunction with groundwater monitoring data collected during the next groundwater sampling event to estimate the magnitude and direction of the shallow groundwater gradient E100 GROUNDWATER 0014EAR RPr(Chv-4\GRANTUN) TECHNOLOGY .