Laserfiche WebLink
440 West Charter Way, Stockton, California December 16, 1993 <br /> Texaco Environmental Services Page 4 <br /> 2.5 Monitoring Well Development, Monitoring, and Sampling <br /> The new monitoring wells (MWS-13 through 17) were developed using a surge-and-bail technique <br /> This technique was used to remove the fine-grained sediment left from drilling, to create an even <br /> sand pack, and to rehabilitate the borehole sides The fines were drawn through the well screen and <br /> subsequently bailed from the well This process was repeated until the water became visibly clear of <br /> fines <br /> The 16 site-related monitoring wells were monitored and sampled during the scheduled quarterly <br /> monitoring and sampling event for the site on September 20, 9993 Groundwater monitoring and <br /> sampling were conducted to determine groundwater elevation, the thickness of any separate-phase <br /> petroleum hydrocarbons (SP), and the distribution of dissolved hydrocarbons in the 16 monitonng <br /> wells at the site <br /> 2 6 Soil and Water Disposal <br /> Soil cuttings generated during drilling were stored on and covered with plastic sheeting Four <br /> samples were collected from the soil pile and combined at and combined at the laboratory into a <br /> composite sample for analysis of BTEX and TPH-G using EPA methods 5030/8020/modified 8015 <br /> Hydrocarbon concentrations were below method detection limits in the composite sample Soil from <br /> the stock pile was transported to a certified facility for disposal Water generated from steam <br /> cleaning of augers and well development was placed in 55-gallon drums pending characterization <br /> and disposal <br /> 25695UM RPT <br /> lr GROUNDWATER <br /> � � TECHNOLOGY <br />