ARCHIVED REPORTS_XR0002026 - Laserfiche WebLink

Home Browse Search

HORIZON ENVIRONMENTAL INC. Specialists in Site Assessment, Remedial Testing, Design and Operation July 30, 2004 Mr. Rob Fishburn Ultramar Inc. 685 West Third Street Hanford, California 93230 Subject: Quarterly Groundwater Monitoring Report Second Quarter 2004 Beacon Station No. 3641 i 1210 East Hammer Lane, Stockton, California Mr. Fishburn: Horizon Environmental Inc. (Horizon) has prepared this report which documents results of second quarter 2004 groundwater monitoring at the subject site located in San Joaquin County as shown on Figure 1. There are seven groundwater monitoring wells (MW-1 through MW-7), eight vapor wells (VW-1 through VW-8) and one sparge well (SW-1) associated with the site (Figure 2). The off-site monitoring well MW-8 was destroyed on -:. April 11, 2003 because of road construction on Hammer Lane. Groundwater Monitoring Groundwater monitoring activities were conducted by Doulos Environmental Company (Doulos) on June 17, 2004 according to Ultramar Field Procedures (Attachment A). Monitoring activities included measurement of static groundwater level, purging groundwater from the wells, collection of groundwater samples, and preparation and delivery of the samples to the analytical laboratory. The depth to groundwater was measured to the nearest 0.01 foot from the top-of-casing (TOC) in monitoring wells MW-I through MW-7, sparge well SW-1 and vapor wells VW-1, VW-3 and VW-7. Vapor wells VW-2, VW-4, VW-5, VW-6 and VW-8 were dry. The physical parameters conductivity, pH and temperature of the groundwater were monitored with field instrumentation during the purging process. The visual characteristics of the groundwater were also noted during the purging process. Field groundwater level and purge data were recorded on the Doulos Groundwater Level Data and Sampling Information Sheets (Attachment B). Groundwater samples were collected from the wells MW-2, MW-4, MW-6 and VW-7. The groundwater samples were submitted, under chain-of-custody documentation, to Kiff Analytical (Kift), a California-certified analytical laboratory (ELAP No. 2236) located in Davis, California and were analyzed for total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and total xylenes (BTEX), and the fuel oxygenates methyl tert-butyl ether (MTBE), diisopropyl ether (DIPE), ethyl-t- 5011 Golden Foothill Parkway, Suite 7 - El Dorado Hills, CA 95762 - (916) 939-2170 - FAX (916) 939-2172 P.O. Box 5283 - Bakersfield, CA 93388 - (661) 589-8389 - FAX (661) 589-1456