SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

California Regional Water Quality Control Board Central Valley Region a Robert Schneider, Chair Winston H. Hickox ray Davis Secretary for Sacramento Main Office MD V D Governor Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 CJ Protection 3443 Routier Road, Suite A, Sacramento, California 95827-3003 Phone (916) 255-3000 • FAX (916) 255-3015 AUG 1 5 2002 ENVI RMIT PE/SERV CES 14 August 2002 Mr. Jim Lancaster Woolsey Oil, Inc. 166 Frank West Circle Stockton, CA 95206 THIRD QUARTER 2002 GROUNDWATER MONITORING AND SAMPLING REPORT, WOOLSEY OIL INC., 930 VICTOR ROAD, LODI, SAN JOAQUIN COUNTY, CA We have reviewed the Groundwater Monitoring and Sampling Report, Third Quarter 2002 — MRP No. 5-01-841, Woolsey Oil Inc., 930 Victor Road, Lodi, San Joaquin County, CA (Report), dated 30 July 2002, and submitted on your behalf by Ground Zero Analysis, Inc (GZA). The Report provides: • the groundwater analytical results of the July 2002 quarterly groundwater monitoring event, • responses to our request for a Workplan to evaluate the methyl tert-butyl ether (MtBE) plume downgradient of MW -3, and • comments to the draft revised Monitoring and Reporting Program (MRP) The Final MRP will be transmitted separately. The Report states that all groundwater samples were analyzed in accordance with the Regional Water Quality Control Board, Central Valley Region (Regional Board) MRP 5-01-841, for total petroleum hydrocarbons, as diesel (TPH-d) and gasoline (TPH-g); benzene-tolune-ethylbenzene-xylenes (BTEX); volatile organic compounds (VOCs); and fuel oxygenates, including methyl tert-butyl ether (MtBE). Maximum groundwater concentrations for July 2002 were TPH-g (31,000 gg/L), benzene (5,000 µg/L), and MtBE (1,400 µg/L). TPH-g and benzene concentrations increased by an order of magnitude from the previous quarter. MtBE concentrations in groundwater increased from 100 µg/L (second quarter of 2002) to 190 µg/L at downgradient onsite monitoring well MW -3. TPH-d was not detected (<50 µg/L) in groundwater, although TPH-d was detected at MW -6 (360 µg/L) in January 2002. Historically, TPH-d concentrations peak in January. VOCs were not detected in groundwater, although the method detection limit (MDL, 4 µg/L) exceeded the MRP -required MDL of 0.5 µg/L. VOCs were previously detected in groundwater at MW -6 (1,2-dichlorethane, 3.3 µg/L) during November 2001. Free product (separate phase product, or SPP) is removed periodically by hand bailing from MW -8. SPP thickness measured 0.24 feet in July 2002. California Environmental Protection Agency CIS Recycled Paper