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I <br /> QuarteflY Report September 1998 <br /> P - <br /> SIERRA LUMBER l <br />' J 375 West Hazelton Avenue, Stockton, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br />' At the requdst of Mr Bob Long of Sierra Lumber, Advanced GeoEnvir"onmental, Inc (AGE) has <br /> prepared this Quarterly Report for 375 West Hazelton Avenue (site), Stockton, California The <br /> location of the site is illustrated in Figure 1, general features at the site are illustrated in Figure 2 <br /> The scope of work of flus investigation included installation of four on-site ground water monitoring <br /> g � g <br /> wells with the objective of assessing and'monitonng subsurface impact of petroleum hydrocarbons <br />' This report is prepared in accordance with guidelines established by the San Joaquin County Public <br /> Health Services- Environmental Health Division (PHS-EHD)and by the Central Valley Regional <br /> Water Quality Control Board for investigation of underground storage tank(UST) sites A summary <br />' of previous investigations at the site was included in the Report 4'h Quarterly Monitoring, dated 21 <br /> November 1997, prepared by John P Cummings &Associates <br /> E i <br /> d <br /> 2A. PROCEDURES <br /> 21 INSTALLATION OF GROUND WATER MONITORING WELLS <br />' On 29,30 July and 20 August 1998, four soil borings (N4W-4 through MW-7)were advanced on-site <br /> as part of site assessment activities related to a former UST Soil boring MW-4 was advanced <br /> vertically to a depth of 60 feet below surface grade(bsg), MW-5 was advanced to a depth of 35 feet <br />' bsg, MW-6 was advanced to a depth of 40 feet bsg, and MW-7 was advanced to a depth of 34 feet <br /> bsg Soil bonngs MW-4, MW-5 and MW-6 were advanced utilizing a B-60 truck-mounted drill ng <br /> equipped_with 8-inch and 10-inch diameter hollow stem augers, soil boring MW-7 was advanced <br />' utilizing a B-75 limited access rig equipped with 8-inch diameter hollow stem augurs Soil cuttings <br /> were stockpiled and covered on plastic sheeting in an area at the site lacking public access The soil <br />' boring locations are depicted in Figure 2 <br /> 2 1 1 Soil Sample Collection, <br /> Discrete soil samples were collected at 5-foot intervals from soil borings MW-4 through MW-7 Soil <br /> samples were collected starting at 10 febt bsg from soil borings MW-4, MW-5 and MW-6 and <br /> starting at 15-feet bsg from soil boring MW-7 Soil samples were collected utilizing a California' <br /> split-spoon sampler loaded with 2-inch by 6-inch brass sleeves The sampler was driven by dropping <br /> a 140-pound weight from a height of 30 inches The number of blows required to drive each 6-inch <br /> length of the sampler(blow counts) was recorded on boring logs by an AGE staff geologist <br />' Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, <br />