Laserfiche WebLink
r <br /> r I <br /> i� <br /> FOOTHILL <br /> ENOINEER NCY <br /> 1 PH gC KM 365-93Bl FAX C;KM PADDY CREEK LANE U001. <br /> 6 -1 96240 <br /> 163 <br /> Mr. Harland Knoll May 5, 1997 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201 <br /> Subject Report of Site Investigation Findings-400 N. El Dorado Street Stockton CA <br /> Owner. Ms Sara Wasserman <br /> Dear I& Knoll: <br /> The following is a report of the site investigation of the sods under the sand filled underground <br /> storage tanks located on the above stated site <br /> REPORT OF SITE IlWESTIGATION <br /> Investigation Procedure <br /> Ms.Wasserman,owner of the property located at 400 N El Dorado Street,has retained J'un Thorpe <br /> . Oil and Foothill Engineering to investigate the existing soil under three underground storage tanks <br /> on the above stated property The investigation was performed on April 18, 1997 with a slant boring <br /> under the tanks <br /> The three tanks that are the subject of this investigation were originally closed in place by filling with <br /> sand. The vent and fill covers for each tank are still in place in the concrete sidewalk The two large <br /> gasoline tanks are located to the north and south of a small tank(See attached drawing of the tank <br /> location). <br /> The tank location under the sidewalk required that soil samples be extracted by slant Push Bore <br /> Four slant Push Bores were used to extract samples from under the tanks (See attached sketch). <br /> Eads bore would terminate at approximately 18'below the surface and directly under the tank Three <br /> or four samples were taken from each of the push bores at bore lengths of IV, 15', 20', and 25' <br /> Samples were extracted using a standard split spoon sampler with a brass sample tube liner Each soil <br /> tube was capped with a layer of foil secured by plastic caps, sealed with duct tape, labeled for <br /> identification, and stored on ice for transport to the laboratory Soil samples were transported under <br /> a chain of custody to a Sherwood Labs for analysis. Samples were analyzed per EPA Methods 8020 <br /> (BTEX), (MTBE), 5030/8015(M)TPH-Gasoline and TEPH as required A selected sample from <br /> under the waste oil tank was tested for heavy metals <br /> No soil samples were extracted below the water table and no water samples were taken from the site <br /> Results of Soil Sample Analysis <br /> The slant bore samples under the southern most tank were contaminated with gasoline ( See Recap <br /> of Soil Analysis Results attached) The PBI @ 20' sample was extracted from under the center of <br /> south tank and has an analysis of 16200 mg/Kg of TPH The PB2 @ 20' sample was extracted from <br />