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Mr. Gordon Lee Boggs July 15, 1985 Page Three FAST GAS - JACKSON CA A summary of the information gathered by I T. Corporation states that no free product was detected in any of the three m nitoring wells and that a steep groundwater flow exists towards the northeast. In addition, the depth to ground- water is shallow at the station, only 5 to 8 feet from the surface, and the closest well has a seal from the surface t a depth of 20 feet. Therefore, the likelihood of any soluable hydrocarbons reaching this well is .minimal. The concentration of soluable hydrocarbons detected is evidence of the remains from a possible overfill of the storage tanks during the delivery process. The laboratory reports show the amount of soluable hydrocarbons has decreased signif- icantly during a two-month period. A good comparison can be made of the reduction of the benzene concentration during the two months. This reduction could repre- sent the natural degradation of the soluable hydrocarbons. The remedial actions for this station should prevent debasement of the immediate area. The first step shall be to install verfill protection at the fill pipes for each storage tank. Secondly, because �he concentrations of soluable hydro- carbons are diminishing at a high rate, Douglas proposes to continue to monitor the groundwater for liquid hydrocarbon. In addition, Douglas proposes to have groundwater samples analyzed monthly for three months for concentrations of soluable hydrocarbons. If the concentrations decrease to an acceptable level, then the monitoring will cease. However, if the concentrations increase or remain fairly constant, then a groundwater depression and treatment system shall be installed. The levels of clean-up shall be based on the economics and a tech- nically feasible approach to protect the resources of concern. FAST GAS - LODI, CA The last section of this report will briefly explain the investigation and clean- up actions proposed for the Fast Gas on Highway 12 in Lodi. The present con- ditions dictate an obvious solution to mitigate the conditions found on site. That is, to install a system to reclaim the liquid product which is on the ground- water. The information gathered by I. T. Corporation will be used in a proposal to you and San Joaquin County regarding the clean-up of the groundwater conditions under the Fast Gas property. The investigation concluded that liquid product was present in MW"-1 on .lune 5, 1985, and continues to be present in MW-1 and MW-13. Because the direction of groundwater flow .has changed dramatically, as inciated by calculations taken by { I.T. Corporation and Fox Environmental Services, Inc. , a groundwater depression I system will be installed on Fast Gas prop rty to control the gradient.. The groundwater depression system will create a cone of depression and thus a radius of influence to allow the lost product to accumulate in a recovery well. This product will then be removed by a second pump system and into an approved treat- went and storage system. Details of these procedures and a complete clean-up plan will be sent to you as soon as possible. f i