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u <br />California Regional Water Quality Control Board <br />Central Valley Region <br />Winston H. Hickox <br />Secretaryfor <br />Environmental <br />Protection <br />23 July 2001 <br />Mr. Jim Lancaster <br />Woolsey Oil, Inc. <br />166 Frank West Circle <br />Stockton, CA 95206 <br />Robert Schneider, Chair <br />Sacramento Main Office <br />Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br />3443 Routier Road, Suite A, Sacramento, California 95827-3003 <br />Phone (916) 255-3000 • FAX (916) 255-3015 <br />OGray Davis <br />Governor <br />C <br />N <br />ADDITIONAL SUBSURFACE INVESTIGATION -DEEP SOIL BORING; FIRST QUARTER <br />2001 GROUNDWATER MONITORING AND SAMPLING REPORT; AND SECOND <br />QUARTER 2001 GROUNDWATER MONITORING AND SAMPLING REPORT, ROBERTS <br />PETROLEUM SERVICES/WOOLSEY OIL CO., 930 VICTOR ROAD, LODI, SAN JOAQUIN <br />COUNTY, CA. <br />We have reviewed the Additional Subsurface Investigation -Deep Soil Boring (Investigation Report), <br />received 15 February 2001; the First Quarter 2001 Groundwater Monitoring and Sampling Report <br />(1 stQtr200 1 GMSR), received 14 February 2001; and the Second Quarter 2001 Groundwater Monitoring <br />and Sampling Report (2ndQtr2001GMSR), received 10 May 2001, for the Roberts Petroleum <br />Services/Woolsey Oil Co., 930 Victor Road, Lodi, San Joaquin County, CA. All three documents were <br />submitted on your behalf by Ground Zero Analysis, Inc (GZA). The Investigation Report documents <br />drilling and sampling of a 101.5 foot below ground surface (bgs) soil boring (DB1). Soil samples were <br />taken by split spoon at ten -foot intervals from the surface to the water table (51 feet bgs), and at five-foot <br />intervals (when possible) from the water table to the total depth. GZA sampled groundwater by a <br />HydropunchTM-type tool at 10 -foot intervals, beginning at 70 feet bgs. <br />The Investigation Report states that all samples (water and soil) were analyzed for Total Petroleum <br />Hydrocarbons -Diesel and Gasoline (TPH-D and TPH-G by EPA Method 8015M), <br />Benzene/Toluene/Ethylbenzene/Xylenes (BETX by EPA Method 8020), and fuel oxygenates (EPA <br />Method 8260). In soil, contamination was not detected at 20 bgs, low levels of gasoline and diesel were <br />detected between 40 and 55 feet bgs (water table smear zone), and trace levels of BTEX were detected at <br />85 and 100 feet bgs. Methyl t -butyl ether (MtBE) was detected in soil at 50 feet bgs (50 ug/kg) and 60 <br />feet bgs (9 ug/kg). Four groundwater samples from 70 to 105 feet bgs revealed increasing levels with <br />depth of TPH-G (140-2900 ug/L), benzene (13-280 ug/L), and MtBE (5.9-25 ug/L). TPH-D was only <br />detected in groundwater at 80 feet bgs (82 ug/L). Previously the nearest known free -product <br />contaminated smear zone (40-55 feet bgs), a result of the seasonally fluctuating water table, was 50 feet <br />upgradient from DB 1 in monitoring well MW -8. The Flame Ionizing Detector soil sample screening <br />showed a decrease from >10,000 parts per million (ppm) at 55 feet bgs, to <10 ppm from 60 to 101.5 <br />feet bgs. <br />California Environmental Protection Agency <br />�a Recycled Paper <br />