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September 15, 1993 Working To Restore Nature <br /> Ruiz Grocery, 'Tracy, California <br /> boring. A photoioruzation detector will be used to evaluate the presence of <br /> hydrocarbon vapors in collected soil samples The soil borings will be drilled to <br /> approximately 15 feet bsg Well construction details are outlined in the attached <br /> Field Procedures Drill cuttings will be stockpiled, covered with plastic Borings not <br /> completed as wells will be backfilled (tremae grouted) from bottom to surface grade <br /> with a cement/bentonite mixture. <br /> o Observe a licensed well driller drill one 10-inch-diameter boring to approximately 10 <br /> feet below groundwater and install a 4-inch-diameter groundwater pumping well <br /> The location of the pumping well will be based on data obtained from Hydropunch <br /> sampling, groundwater monitoring, and the subsurface investigation <br /> o Provide traffic control during drilling operations within San Joaquin County right-of- <br /> way <br /> o Collect relatively undisturbed soil samples at 5-foot intervals or sediment lithology <br /> changes from the ground surface to the total depth of each boring, and classify soil <br /> samples according to the Unified Soil Classification System. <br /> • o Develop, purge, and sample the four newly installed groundwater monitoring wells, <br /> and purge and sample the three previously installed groundwater monitoring wells. <br /> Purge water will be stored in 55-gallon drums approved by the Department of <br /> Transportation for fluids and left onsite. Purge water disposal will be evaluated <br /> following analytical results of the groundwater samples <br /> o Submit one soil samples from each boring used for Hydropunch sampling and two <br /> samples from each of the remaining borings to a State-certified laboratory for <br /> analysis of total petroleum hydrocarbons as gasoline (TPHg) using modified <br /> Environmental Protection Agency(EPA)Method 8015/5030(modified) and benzene, <br /> toluene, ethylbenzene, and total xylene isomers (BTEX) using EPA Method 8020 <br /> o Submit groundwater samples from collected via hydropunch, onsite and offsite <br /> monitoring wells to a State-certified laboratory for analysis of TPHg and BTEX using <br /> EPA Methods 8015/5030 (modified) and 602, respectively <br /> o Collect four soil samples from the drill cuttings to be composited at the laboratory <br /> and analyzed for TPHg and BTEX using previously stated methods, total lead using <br /> EPA 7421, and corrosivity, igrutability, and reactivity Results of analyses will be <br /> used to evaluate disposal options Drill cuttings will be stored at the site We will <br /> evaluate disposal options of drill cuttings <br /> 123020-IW 3 <br />