Laserfiche WebLink
' 1117 lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> http:llwww.ateassociates.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> } <br /> A 8 8 D C 1 A T E 8 111 C . <br /> October 10, 2005 I'D C E Eg <br /> 54.28349.0001 <br /> ' OCT 1 3 2005 <br /> Ms. Lori Duncan ENVIRONIIViiENT HEALTH <br /> ' San Joaquin County PERMIT/SERVICES <br /> Environmental Health Department <br /> 304 E. Weber Street, Third Floor <br /> ' Stockton, California 95202 <br /> ' Subject: First and Second Quarter 2005 Monitoring Report, Former Stockton City Taxi Cab <br /> Company, 2085 East Fremont Street, Stockton, California <br /> ' Dear Ms. Duncan: <br /> This report presents the results of quarterly monitoring and investigation action activities performed <br /> during the first and second quarter of 2005, by ATC Associates Inc. (ATC) at the site located at 2085 <br /> East Fremont Street in Stockton, California (Figures 1 and 2). Sampling was performed to monitor <br /> the distribution of petroleum hydrocarbons in groundwater. Monitoring was performed to determine <br /> the groundwater flow direction° and the hydraulic gradient in the uppermost groundwater. Drilling <br /> activities were performed to�address an improperly installed monitoring well (MWI 1). <br /> ' SITE HISTORY <br /> In 1998, two 10,000-gallon gasoline underground storage tanks (USTs) and associated product piping <br /> ' were removed from the site by Advanced GeoEnvironmental. Soil samples were collected from the <br /> tank pit and under product piping and analyzed for petroleum hydrocarbons. Analytical testing <br /> indicated the samples collected from the tank pit contained detectable concentrations of petroleum <br /> ' hydrocarbon constituents. <br /> In February 2000, WHF, Inc. (WHF) advanced two soil borings, Bl and B2, to depths of <br /> ' approximately 81.5 and 31.5 feet below ground surface (bgs), respectively. Soil and groundwater <br /> samples were collected from the borings and submitted for laboratory analyses. These soil and <br /> groundwater samples contained detectable concentrations of petroleum hydrocarbon constituents. <br /> ' In July 2003, WHF advanced six soil borings, four of which were completed as monitoring wells <br /> MW I through MW4. Soil samples collected from these borings contained detectable concentrations <br /> of petroleum hydrocarbon constituents. Petroleum hydrocarbons were detected in groundwater <br /> samples collected from MW1 through MW4. <br /> ' From November 10 to November 12, 2004 and November 15 to November 17, 2004, an ATC <br /> geologist supervised the installation of monitoring wells MW5 through MW12. Soil samples were <br /> collected from the boreholes of MWS, MW6, MW7, MW8, MW9, MW 10, MW 11, and MW 12 and <br /> selected soil samples were submitted for laboratory analyses. Each well was constructed with 2-inch <br /> s:lenviromenta11283491repom\2005 1&2 QMR.doc I <br /> ' ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />