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i II <br /> r _ - <br /> 1 1 it <br /> I <br /> r <br /> Quarterly Report - Fourth Quarter 1999 <br /> CHEROKEE TRUCK STOP <br /> r - ` 3535 East Cherokee Road, Stockton, California <br /> 1 r <br /> 1 <br /> r1.0. INTRODUCTION <br /> At the request of Mr Ellis Cecchim of Cecchini, Cecchmi -and Giovannom, Advanced <br /> rGeoEnvironmental, Inc (AGE) has prepared this report for field work performed at 3535 East <br /> Cherokee Road, Stockton, California, during the fourth quarter of 1999 The scope of work this <br /> quarter included monitoring the ground water well network on the site and performance of fate and <br /> r transport modeling This report documents collection and analysis of ground water samples and the <br /> results of ground water measurements <br /> rThe site setting is illustrated in Figure 1 Structures, monitoring well and soil boring locations are <br /> illustrated in Figures 2 and 3 Background information was summarized in the Quarterly Report- <br /> rSeptember 1999, dated 29 December 1999 and prepared by AGE <br /> 2.0. PROCEDURES <br /> Five ground water monitoring wells were purged and sampled on 27 December-1999 Fate and <br /> transport modeling was performed utilizing SESOIL computer modeling The mass of hydrocarbons <br /> removed during excavation and removal of the USTs was calculated Field work was performed in <br /> accordance with San Joaquin County Public Health Services-Environmental Health Division(PHS- <br /> EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidehnes for the <br /> investigation of underground storage tank (UST) sites <br /> 21 MONITORING WELL PURGE PROCEDURES <br />' On 27 December 1999, a Solmst water level meter was used to measure the depth to ground water <br /> relative to the tops of the well casings in six monitoring wells in the area of the former UST <br />' locations, three wells for a separate investigation on the subject property and one well at 3400 <br /> Newton Road The ground water elevation in each well and hydraulic gradient for the site were <br /> determined from these data(Table 1) " <br /> rAfter measuring ground water depths, monitoring wells UST-2 through UST-6 were purged using <br /> a Grundfos submersible purge pump and PVC bailers Approximately 10 to 15 gallons of water (a ` <br /> minimum of three well volumes) were removed from each of these wells Ground water was purged <br /> from near the top of the water column to remove water trapped within the unscreened interval of the , <br /> well casings Temperature, pH and conductivity of purged water were measured at regular intervals <br /> during purging using a Hydac water analyzer The recorded field data and logs are included in <br /> Appendix A Purged water was stored on-site in 55-gallon DOT-approved drums pending laboratory <br /> analyses <br /> Advanced GcoEnvi ron mental,Inc <br />