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City of Stockton Redevelopment Agency B34604.01a February 16, 2001 Page A -2 foot increments as the boring fills with ut. SON for groundwater monitoring well installation are described in a subsequent paragraph( f pertinent to this investigation). Soil cuttings generated during drilling will be containerized in United States Department of ' Transportation(DOT)-approved drums. Typically,the stockpiled soil is characterized by collecting and analyzing composite samples from the stockpile. Twining can recommend an appropriate method for disposition of the cuttings based on the analytical results. Disposal will be the ' responsibility of the client. Standard Operating Procedures for Hand Augering and Soil Sampling Subsurface assessment permits,if required,are filed with the appropriate regulatory agencies prior to conducting field operations. Sampling equipment is thoroughly cleaned before,during,and after ' each use according to Twining's"Standard,Operating Procedures for Equipment Decontamination". Hand auger soil borings are between 1.5 and 3.0 inches in diameter depending upon the size of the auger. These soil borings are advanced by turning the hand auger handle repeatedly which causes the auger bit to cut into the soil. After approximately 6 inches of advance,the bucket of the auger fills with soil cuttings and it is then remo ed from the borehole and the cuttings are emptied. The ' auger is then replaced in the borehole to advance another 6-inch interval. In this manner the borehole is extended to the designated sampling depth. ' Soil samples are collected from hand auger soil borings by lowering a soil sampler equipped with a stainless-steel retention sleeve into the andisturbed soil at the bottom of the borehole. The soil sampler is then driven approximately 6 i ches using a slide hammer. ' The soil borings are abandoned by grouting with a 6-sack cement slurry containing 3 to 5 percent bentonite, or backfilling with clean soil. Abandonment procedures depend upon the boring depth, ' depth to groundwater, project objectives, and regulatory requirements. Soil cuttings generated during hand aug ' gaze either replaced in the borings, Standard Operating Procedures for Groundwater Monitoring Well Sampling Standard operating procedures (SOPs) used by The Twining Laboratories, Inc. (Twining) when ' sampling groundwater monitoring wells are presented below. Twining observes these procedures in order to obtain consistent, reliable data. Groundwater sampling will be perform& following development, or when the post-development water level in the well has returned to the static level. before purging and sampling is performed, the depth to water and the total well depth,will be measured. If floating hydrocarbons are suspected, ' a bottom-filling clear bailer,or hydrocarbon-detecting paste bailer,or interface probe may be used to record floating hydrocarbon thickness. Depth to water will be measured with an electric sounder, according to Twining's "Standard Operating Procedures for Measuring Depths to Water and ' Calculating Groundwater Elevations".