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SUBSURFACE INVESTIGATION OF <br /> SOIL AND GROUND-WATER QUALITY AT <br /> BEACON CARDLOCK STATION NUMBER 610 <br /> 3300 WATERLOO ROAD <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> During March of 1993, SSB Environmental Consultants, Inc , installed three monitoring wells at <br /> IBeacon Cardlock Station Number 610 located at 3300 Waterloo Road in Stockton, California <br /> Previously, in April of 1987, four ground-water monitoring wells had been installed at the site to <br /> depths of approximately 65 feet Two of these wells are now dry due to a lowered ground-water <br /> table The remaining wells, drilled to similar depths, could not be opened and are presumed dry. <br /> The current investigation, which involves the installation of three monitoring wells on-site, is <br /> designed to investigate soil and ground-water quality at the site <br /> 1.1 Purpose <br /> This investigation was designed to evaluate whether gasoline range hydrocarbons remain in soil and <br /> ground water at Beacon Cardlock Station Number 610 in Stockton, California <br />' 1.2 Scone of Work <br /> During this investigation, three 4-inch diameter monitoring wells were installed in 10-inch borings, <br /> to a maximum depth of approximately 90 feet below surface. Soil samples were obtained from each <br /> monitoring well boring at 5 foot intervals Each soil sample was field analyzed for the presence <br /> of gasoline range hydrocarbons using a photoionization detector (Model OVM 580B) Field <br /> analysts readings are recorded on the boring logs in Appendix A Six samples from each boring <br /> were submitted for laboratory analysis for benzene, toluene, ethylbenzene, xylenes (BTEX), and <br /> total petroleum hydrocarbons using a gasoline standard (TPHg) <br /> Each monitoring well was constructed with 20 feet of screened interval which penetrated to 15 feet <br /> below the water table Each monitoring well was developed and purged Ground-water samples <br /> were collected on April 1, 1993, for analysis for BTEX and TPHg from the three newly installed <br /> monitoring wells Monitoring well MW-5 was resampled on April 16, 1993 <br /> After surveying each well head, the ground-water gradient and flow direction were evaluated, using <br /> depth-to-ground-water measurements collected in April, 1993 The field and analytical data <br /> Icollected during this investigation were compiled and are presented in this report <br />