Laserfiche WebLink
FOOTHILL <br /> ENGINEERING <br /> 8442 STORY RIDGE WAY,ANTELOPE,CA 95843 r'�lu <br /> PH:(916)729-5184 FAX:{916)729-0593 <br /> Mr. Michael Infurna <br /> San Joaquin County Public Health Services <br /> 600 East Main Street December 4, 2009 <br /> Stockton, CA 95202 <br /> Subject: Mrs. Helen Higgins /Vogue Cleaners <br /> 2315 N California Street <br /> Stockton, CA Site code: 231032 <br /> Global ID T0607700741 <br /> Dear Mr. Infurna: <br /> Please find below the Environmental Screening Level assessment from the ESL Surfer <br /> produced by the Regional Water Quality Control Boa d, San Francisco. Please attach this data <br /> to the Request for No Further Action of 9122109. <br /> RESIDUAL SOIL CONTAMINATION ASSESMENT <br /> CHEMICALS OF CONCERN <br /> The chemicals of concern are the chemicals in soil at the bottom of the tanks. This is the source <br /> of contamination and has the highest concentrations and shallowest depths. Tank 42, the leaded <br /> gasoline tank with soil samples taken with MW-1 at 10' depth are the highest concentrations <br /> and shallowest depths. The chemicals of concern are Benzene(1.84mg/Kg), i <br /> Toluene(261mg/Kg), Ethylbenzene(22.8mg/Kg), Total. Xylenes(1,540mg/Kg), Total Petroleum <br /> Hydrocarbons as gasoline (TPHg. 12,300mg/Kg), and Stoddard Solvent(TPHg Middle <br /> Distillates 17,000mg/Kg). In addition there is Ethylb nzene(32.5mg/Kg) at 42' depth, and 1,2- <br /> Dicloroethane(0.0009mg/Kg) at 50' depth below group d surface. <br /> i <br /> The only data entered in the ESL Surfer for evaluations was soil concentrations. There has been <br /> extensive groundwater monitoring for this site. Groundwater data was not entered because it is <br /> known that the residual contamination exceeds drinking water limits of the Basin Plan. The <br /> limit of the plume is known and sensitive groundwater receptors are not threatened. It has been <br /> demonstrated that the concentrations of chemicals are naturally attenuating, as would be I <br /> expected since the source has been removed. <br /> METHOD OF RISK ASSESMENT <br /> Environmental Screening Level (ESL) Surfer was used to evaluate the risk to humans from <br /> contaminated soil. The ESL Surfer is an Excel Spreadsheet ran with macros to compare, sort <br />