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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider, Chair <br /> Winston Ii.Ilickoa Gray Davis <br /> Serretan7 for Sacramento Main Office Governor <br /> Environmental Internet Address: http://w",.swrcb.ca.gov/—twgcb5 <br /> Protection 3443 Routier Road.Suite A,Sacramento,California 95827-3003 <br /> Phone(91 G)255-3000•FAX(91 G)255-3015 <br /> 1 October 2001 <br /> Mr. Sheldon Heckman <br /> Mr. Richard Calone, Esq. <br /> Richard Calone, Inc. <br /> 1810 Grand Canal Boulevard <br /> Stockton, CA 95207 <br /> ADDITIONAL SITE ASSESSMENT REPORT, CONNELL MOTOR TRUCKING INC. - <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> We have reviewed the Additional Site Investigation Report, Connell Motor Trucking Inc. - Stockton, Sall <br /> Joaquin County (Investigation Report),received 22 May 2001. The Investigation Report documents <br /> drilling and sampling of soil borings, and installation and sampling of seven groundwater monitoring <br /> wells. Four borings were sampled using cone penetrometer(locations P30 through P33) from 27-29 <br /> December 2000 (direct push). Seven borings were drilled using hollow stem auger(HSA, locations <br /> MW-1 to MW-7) during 24-26 January 2001. Soil samples (cores) were taken at five foot depth <br /> intervals, and were analyzed at the following depths: <br /> • Using a soil sampler(direct push) from depths of 60'to refusal/90', and <br /> • Using a split spoon (HSA) from depths of 30' through 55' (MW-1); 45' and 50' (MW-3); at five <br /> foot intervals from 45'though 60' (MW-4); and at 60', 80' and at five foot intervals from 95' <br /> through 105' (MW-6). <br /> Groundwater was sampled from a HydropunchTM-type tool in the direct push borings, and from <br /> monitoring wells MW-1 through MW-7 during quarterly groundwater monitoring on 5 February 2001. <br /> The water table is approximately 44 feet below ground surface. Groundwater flow direction is to the <br /> northeast at a gradient of 0.0005 ft/ft. <br /> All samples (water and soil) were analyzed for total petroleum hydrocarbons (TPH)-diesel,TPH- <br /> gasoline, and TPH-stoddard solvent (TPH-D, TPH-G and TPH-SS by EPA Method 8015 Modified), <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX by EPA Method 8020), and volatile organic <br /> compounds, including oxygenates (VOCs by EPA Method 8260). Soil concentration results include <br /> 2300 mg/kg (TPH-G), 2000 mg/kg (TPH-D), 2300 mg/kg (TPH-SS) and methanol (VOCs) at 310 <br /> mg/kg. Groundwater results include 120,00 µg/L(TPH-G), 330 µg/L(TPH-D), 120,000 µg/L(TPH-SS), <br /> 96-72-1100-760 µg/L(B-T-E-X). <br /> California Environmental Protection Agency <br /> Ca Recycled Paper <br />