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' Cahforrua Department of Transportation Revised September 23, 1994 Project No. 102818-01 GROUNDWATER MONITORING WELL LOWERING rGroundwater morutonng wells MW-9,MW-11,MW-13,MW-14,MW-16,MW-19,MW-20,and MW-24 were lowered approximately 6 feet due to proposed future site construction Groundwater monitoring well lowering consisted of the following activities: removal of the well cover and box,and conservation for potential future use, drilling out of the annular seal to an approximate depth of 6 feet bgs, severing of the PVC casing at an approximate depth of 5-1/2 feet bgs, placement of a slip cap on top of the PVC casing, backfilling of the hole with clean sand, placement of a small metal object at an approximate depth of 4 feet bgs to facilitate future well locating, placement of an approximate 1/2-foot bentonite seal near the top of the hole, and placement of approximately one foot of neat cement or soil to match the surrounding ground surface STOCKPILE SOIL SAMPLING Soil cuttings generated from abandonment and lowering activities were placed on Vzsqueen in two separate stockpiles located near the southeast corner of the facility Soil was separated into the stockpiles based on the results of previous soil sampling and analysis conducted during monitoring well installation Each stockpile contains approximately 15 cubic yards of soil A single soil sample was taken from each stockpile Soil sample SP-1 #1 was collected from the center of the northernmost stockpile at an approximate depth of 1/2- foot below the surface. Soil sample SP-2 #1 was collected from the center of the southernmost stockpile at an approximate depth of 1/2,foot below the surface Soil samples were collected by tightly packing soil into wide-mouthed, 8-ounce glass jars with Teflon- lined, screw-type lids obtained from the laboratory Samples were then labelled, placed in a cooler containing ice, and transported to Quality Assurance Laboratories for chemical testing under chain-of-custody protocol The stockpiled soil was collected by Manley and Sons Trucking on August 30, 1994, and was transported under non-hazardous waste manifest No 27326 to the Forward, Inc Landfill located in Stockton, California for disposal A copy of the manifest for the soil transfer is presented in Appendix B 6