Laserfiche WebLink
Quarterly Report - Second Quarter 2003 <br /> TOP FILLING STATION <br /> 101 South Wilson Way, Stockton, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 101 South Wilson <br /> Way (the site), Stockton, California The site setting is illustrated on Figure 1 Site structures and <br /> monitoring well locations are depicted on Figure 2 <br /> The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site This report has been <br /> prepared in accordance with guidelines issued by the California Regional Water Quality Control <br /> IBoard- Central Valley Region(CVRWQCB) for investigation of underground storage tank(UST) <br /> sites A summary of previous investigations at the site was included in the AGE-prepared Quarterly <br /> I Report- Third Quarter 2002, dated 13 December 2002 Ground water monitoring data acquired to <br /> date is included in the tables of this report <br /> Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four <br /> informal hydrogeologic units (Quarterly Report -Second Quarter 2000, dated 31 July 2000) The <br /> informal hydrogeologic units were defined as Hydrologic Unit 1 (30 to 55 feet bsg), Hydrologic <br /> I Unit 2(55 to 65 feet bsg),Hydrologic Unit 3 (65 to 85 feet bsg)and Hydrologic Unit 4(85 to at least <br /> 100 feet bsg) <br /> 2.0. MONITORING AND SAMPLING PROCEDURES <br /> A quarterly ground water monitoring event was performed at the site on 04 June 2003 Ground water <br /> monitoring procedures for the site were outlined In Work Plan Addendum-June 2001, dated I I June <br /> 2001 and approved by the San Joaquin County Environmental Health Department(EHD) by letter <br /> Idated 07 July 2001 <br />' 2 1 WELL MONITORING AND PURGING <br /> Depth to ground water was measured in each well from the top of the well casing to the nearest <br /> 0 01-foot utilizing a Solrnst water level meter Groundwater was not encountered in wells VW-lA, <br /> VW-1 B,VW-213 and VW-3B and was reported as"dry' The groundwater elevation at wells MW-1 <br /> through MW-7, VW-1C, VW-2A and VW-3A were calculated by subtracting the measured depth <br /> to ground water from the surveyed casing elevation As-built monitoring well construction details <br /> are summarized in Table 1 Ground water elevations were plotted and contoured on a scaled site map <br /> (Figure 3) <br /> Advanced GeoEnvironmental,Inc <br /> I <br />