Laserfiche WebLink
I <br /> L <br /> V 1117 Lone Palm Ave,Suite 201 <br /> Modesto,CA 95351 <br /> L Phone:209-579-2221 <br /> Fax: 209-579-2225 <br /> Feasibility Study <br /> Eggiman Property <br /> 1112 East Harding Way <br /> Stockton, California <br /> r ATC Project No. 54.22493.0001 <br /> L.� <br /> 1.0 INTRODUCTION <br /> On behalf of Mr. Robert Eggiman, ATC Associates Inc. (ATC) has prepared this Feasibility <br /> Study, to present potential options for remediating petroleum impacted soil and groundwater at <br /> the above referenced site. This study was prepared at the request of the San Joaquin County <br /> Environmental Health Department. A summary of environmental activities conducted at the site <br /> fiand recommendations relating to remediation options are included herein. <br /> �•+ 1.1 Site Location <br /> The site is located at the southeastern corner of the intersection of East Harding Way and Union <br /> Street in Stockton, California, as shown on Figures 1 and 2. The property is located in a mixed <br /> residential, industrial, and commercial area, and is currently occupied by a hydraulic .repair <br /> business. <br /> 1.2 Background Information <br /> In April 1987, SEMCO removed and disposed of.two 1;000-gallon regular gasoline underground <br /> rstorage tanks (USTs), associated piping, and fuel dispenser from the locations shown on Figure <br /> L 2. A soil sample was collected from beneath the end of each tank at approximately 17 feet below <br /> ground surface (bgs). Analytical testing indicated the collected samples contained detectable <br /> rconcentrations of petroleum hydrocarbon constituents. The excavation was subsequently <br /> L backfilled to the ground surface. <br /> On July 24, 1997, six soil borings were advanced to depths ranging from approximately 16 to 31 <br /> feet bgs to investigate the extent of residual soil contamination at the site. Detectable <br /> concentrations of total petroleum hydrocarbons as gasoline (TPHg), total petroleum <br /> hydrocarbons as diesel (TPHd), and benzene, toluene, ethylbenzene, and xylenes (BTEX) were <br /> present in the soil samples. The distribution of petroleum constituents beneath the site was <br /> evaluated and appeared to be limited laterally to the immediate vicinity of the former tank pit. <br /> The highest concentrations were reported between 10,and 20 feet bgs and generally attenuated <br /> with depth. Only low concentrations of toluene [0.064 milligrams per kilogram (mg/kg)] and <br /> xylenes [0.012 mg/kg] were detected at approximately 30 feet bgs in one boring, the maximum <br /> depth explored. Attempts were made to further advance the Geoprobe® unit in several of the <br /> s:\cnvironmental\22493\rcports\fcasibility.doc j <br />