Laserfiche WebLink
S <br /> 1 I s 1 <br />' Quarterly Report - Second Quarter 2004 <br /> • Former STEFANOS GAS STATION <br /> 1419 East Charter Way, Stockton, California - <br /> 11 <br /> �1 ` 'w <br /> I 1, <br /> 1.0. INTRODUCTION <br /> y At the 'request of Mrs , Winfred Alexander; executor of Mary Gardella Trust, Advanced, ; <br /> GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 1419 <br /> East Charter Way, Stockton, California (site) The objective of the work was to monitor dissolved <br /> petroleum hydrocarbon concentrations in ground water and to characterize ground water elevation, <br />' flow direction, and hydraulic gradient on the site The site and the surrounding area are Illustrated <br /> on Figure 1 On-site structures and monitoring well locations are Illustrated on Figure 2 <br /> 1 <br /> _ 2.0. PROCEDURES r F�� <br /> ' I I jti <br /> t Field procedures were performed in accordance with Central Valley Regional Water Quality Control <br /> Board(CVRWQCB)and San Joaquin County Environmental Health Department(EHD)guidelines <br />' for investigating underground storage tank(UST)sites and sampling ground water monitoring wells <br />� . 2 1 WELL MONITORING AND EVACUATION <br /> On 16 June 2004, ground_water monitoring and sampling were performed on monitoring wells <br /> MW-1 through MW-7 Prior to sampling, the depth to ground water was measured from the top of <br /> each well casing to the nearest 0 01-foot utilizing a Sollnst water level meter The ground water <br /> ' elevation in each well was calculated by subtracting the measured depth to ground water from the <br />' surveyed casing elevation (Table 1) <br /> 1 <br /> 1 <br /> After water levels were measured, each monitoring well was purged of standing water utilizing a` <br /> tnew, disposable plastic bailer Approximately 3 to 4 gallons of water'(a minimum of 3 casing-water , <br /> volume's) were removed from each well Ground water temperature, pH, and conductivity were <br /> f measured'at regular'intervals during purging using an Oakton water analyzer Field sheets and data <br />' are Included iri Appendix A Purged water was stored on-site In appropriately labeled, 55-gallon <br /> Department of Transportation (DOT)-approved drums pend1pg proper dtsposal <br /> e I , <br /> �2 2 ',COLLECTION-6F GROUND WATER SAMPLES <br /> Water samples were collected from the purged wells using new, disposable plastic bailers after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred Into three 40-milliliter(ml)volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18%hy11rochloric acid solution as a sample preservative After collection, the samples were - <br /> ry <br /> 1 xr <br /> I, Advanced Geo Environmental,Inc <br /> o , <br />