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yt Quik Stop Markets, Inc. February 11, 1992 Project No. 3-49132-32 Page 3 - remedial activity pending receipt of permission to enter adjacent properties. Prior to this, RESNA personnel measured the depth to groundwater and checked for the presence of floating product at each well using an optical interface probe. A clear u- acrylic bailer was used to collect a water sample from the wells to check for the presence of floating product, surface sheen, or odor; none was detected. Groundwater samples for laboratory analysis were then collected from the well following the procedures outlined in our groundwater sampling protocol (Appendix A). Approximately four well-casing volumes of groundwater were removed before sampling. Groundwater removed from the wells and equipment rinse water were placed in Department of Transportation approved drums and left on-site pending the laboratory analytical results. The sample collected before pumping was designated M -5. The well was then VV pumped using a vacuum truck with a clean pvc extension. The water in the well was kept at a very low level by periodic pumping for a period of about three hours. It is estimated that approximately 200 gallons of groundwater was removed from the well during this process. At the end of this pumping, another water sample was obtained using the same procedures described above and designated MW-5B. These samples were then transported to Applied Analytical, Inc., a state-certified analytical laboratory located in Fremont, California, and analyzed for TPHG and BTEX. The results of these analysis are presented below. Ethyl Total Sample Sample TPHG Benzene Toluene Benzene Xylenes Number Date (ppb) ( b) ( MW-5 10/15/91 4200 <0.5 3.3 24 1.3 MW-5B 10/15/91 1770 <0.5 <0.5 <0.5 <0.5 TPHG Total petroleum hydrocarbons as gasoline ppb Pasts per billion(I.tg/L) <0.5 Not detected at or above listed practical quantitation limit for the method. After approximately 200 gallons of water had been pumped from MW-5, all compounds which were analyzed for were found to decrease a substantial amount. Quarterly Field Operations Prior to the December 18, 1991 quarterly sampling, RESNA personnel measured the depth to groundwater a• 3 checked for the presence of floating product at each well .....__. using an optical interface probe. A clear acrylic bailer was used to collect a water sample from the wells to check for the presence of floating product, surface sheen, or - - - - - - - ---- odor; none was detected. Groundwater samples for laboratory analysis were then