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' k'■ KLEINFELDER ' for safety concerns. The sampling equipment was cleaned between locations with a Liquinox® (laboratory-grade detergent)wash followed by a potable water and distilled water rinse. ' Soil samples collected from potholes were collected from the bucket of the excavator for safety ' reasons. Soil samples were taken in proximity to the teeth of the bucket where soils are generally less disturbed. The soil samples were collected by pushing a 2-inch diameter by 6-inch long stainless steel tubes into the soil. ' The discrete stockpile sampling locations were chosen from approximately equal volumes of the stockpiles. Soil samples were collected by hand augering to the desired sampling depth and by ' slide hammering a 2-inch diameter by 6-inch long stainless steel tube into the soil. The samples were collected at depths of approximately 6-inches to 3 feet below the surface or sides of the stockpile(s). ' The stainless steel tubes used for collecting the samples were immediately sealed with Teflon° sheeting and tight-fitting plastic end caps. 1 4.3.2 Sample Handline ' After collection, both soil and groundwater samples were labeled, logged on a chain-of-custody form, and immediately stored in an iced cooler. The samples were transported under chain-of- custody control to Kleinfelder's office and then transported to a state certified laboratory for the requested analysis. The laboratory data sheets and chain-of-custody records are included in Appendix C. The samples were analyzed on an accelerated turnaround schedule ranging from ' one to three days for completion. 4.4 TEMPORARY MONITORING WELL DESTRUCTION ' Each of the four temporary wells TW-1 through TW-4 were destroyed according to San Joaquin ' County Public Health Services, Environmental Health Division (PHS/EHD) guidelines. Mr. Harlin Knoll of PHS/EHD commented that since the four wells are temporary a well destruction permit was not necessary and that destruction by pressure grouting was acceptable. The four temporary wells were destroyed on July 11, 2001. A Kleinfelder geologist was present to observe and document the temporary well destruction activities. The wells were destroyed by Kleinfelder's drilling subcontractor Spectrum Exploration Inc. of Stockton, California. Plate 2 illustrates the approximate locations of the former temporary wells. ' Each of the four temporary wells were tremmie grouted with the well casing in place and then pressure grouted for approximately five minutes using a "Moyno" progressive cavity pump. The grout/bentonite powder slurry was mixed using Type I-II Neat Cement and approximately 5 ' percent bentonite powder. Approximately 25 to 30 gallons of grout was used for the destruction of each well. After pressure grouting, each of the well casings were pulled from the ground. Each well boring was then topped off to ground surface and left to settle to about 2 feet bgs. ' Each of the borings were then filled to the surface with soil. 20.4341-11.1301/2011R959 Page 15 of 31 Copyright 2001,Kleinfelder,Inc. August 21,2001