Laserfiche WebLink
• w <br /> MONITORING WELL INSTALLATION AND QUARTERLY REPORT <br /> Conrady Service Station <br /> ' 1002 Yosemite Street <br /> Stockton, CA <br /> ' 1.0 INTRODUCTION <br /> ' This report presents the results of an investigation of groundwater conditions at 1002 <br /> Yosemite Avenue, Stockton, California The investigation was authorized by Mrs <br /> Marione Conrady, property owner, and was performed in accordance with the <br /> Geological Audit Services, Inc (GeoAudit) proposal dated April 25, 1993 The <br /> objective of the investigation was to collect groundwater samples and determine the <br /> groundwater gradient and flow direction, as required by San Joaquin County Public <br /> ' Health Services - Environmental Health Division (PHS/EHD) as a prerequisite to <br /> certification for site closure <br /> ' 2.0 BACKGROUND <br /> 2.1 Site History <br /> ' The site is a former gasoline service station located at the intersection of Yosemite <br /> I , Street and Acacia Street in a relatively flat area zoned for commercial and <br /> residential use (Figure 1) It is our understanding that Mr Jules Conrady operated <br /> the station from 1961 until 1978, and that the underground fuel storage tanks were, <br /> removed from the site in 1980 These included a 4,000 gallon regular gasoline tank,I <br /> a 3,000 gallon ethyl gasoline tank, and a 3,000 gallon supreme tank There is no <br /> available information on the condition of the tanks at the time of their removal, and <br /> no soil samples were collected from the tank excavation <br /> 2.2 Previous Work <br /> Evax Technologies conducted a soil-gas survey in 1990 in order to determine whether <br /> ' petroleum vapors were present in the soil Subsequently, GeoAudit performed a site <br /> I ; assessment of the property in October 1992 The results of the soil-gas'survey and <br /> the site assessment were presented in GeoAudit`s Preliminary Investigation and I <br /> Evaluation Report, dated January-21, 1993 In the assessment, 0 0082 ppm ltoluene <br /> and 6 00160 ppm xylene were detected at a depth of 30 feet, and 0 021 ppm toluene ' t <br /> was detected at a depth of 35 feet in one of Istx soil borings''Based on theses result's, 11� <br /> PHS/EHD denied a request for'site closure and requlested a groundwater assessment <br /> I II <br /> 6.aE.td Anda Seiw� <br /> O4—*AW11 IM 11 f 1 I I <br /> PI <br /> i I I I I1 it f l E` <br /> 1 I f 41 4'I I I I I E 4 I I <br /> I iEI I�'4 I 14 �' i Ir II I IC 1 I'41 ls, II lllil i€I° I ` I I'11 I II IJ I i� I '� f Ill 1 I I� I 11I �I X41 <br /> II!i E'rt <br />