Laserfiche WebLink
_ „ f <br /> l� <br /> •. 1117 Lone Palm Avenue'' <br /> aSuite B <br /> Modesto, CA 95351 <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> ! A S S O C I A T E S I N C 00�ll r'rfC ft <br /> June 30, 2000 <br /> 17295 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Monitoring Report Second Quarter 2000, Inland Paint Company, 117 West <br /> Harding Way, Stockton, California <br /> Dear Mr. Infurna: <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> June 2, 2000 by ATC Associates Inc. at the site located at 117 West Harding Way, Stockton, <br /> California (Figure 1). Monitoring was performed to determine the groundwater flow direction <br /> and the hydraulic gradient in the uppermost aquifer. Sampling was performed to monitor the <br /> distribution of petroleum hydrocarbons in groundwater at the site. <br /> SITE HISTORY <br /> In March 1990, one 1,000-gallon underground storage tank (UST) and all associated piping and <br /> dispensing equipment were removed and transported off-site. Laboratory analysis of soil <br /> samples collected from beneath the former 1,000-gallon UST location indicated the presence of <br /> detectable concentrations of ethylbenzene and xylenes. After the tank was removed, the area of <br /> excavation of the former tank was backfilled with backfill material provided by Stockton Service <br /> Station Equipment. <br /> On January 8, 1998, an ATC geologist supervised the advancement of one soil boring to 41.5 <br /> feet below ground surface (bgs). Soil samples were collected and submitted for analysis of total <br /> petroleum hydrocarbons as gasoline and diesel (TPHg and TPHd) by EPA Method 8015; and <br /> volatile organic compounds (VOCs) by EPA Method 8260. A Hydropunch groundwater sample <br /> was collected and analyzed for TPHg, TPHd, VOCs, and halogenated volatile organic <br /> compounds (HVOCs) by EPA Method 801018020. <br /> Petroleum hydrocarbon constituents were detected in soil samples collected from boring SBI. <br /> ` The highest reported constituent concentrations were observed at 5.5 feet bgs and appeared to <br /> attenuate rapidly with depth. Trace amounts of petroleum hydrocarbon constituents were also <br /> wA 172951quartfyl2gr-2000.doe 1 <br />