SITE INFORMATION AND CORRESPONDENCE

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�rayo, KA V O OAFL C OMPA N V PA� JPT 1221 EAST MAIN STREET•CHATTANO GA, TENNESSEE 37408•TELEPHONE 615-756-5770 December 9, 1985 Mr. Ron Valtnati -(HAND DELIVER) San Joaquin County Health Department 1601 East Hazelton Avenue R.O. Box 2009 'S ��Aii3S/�iP�1�3d Stockton, CA 95201 141-Id3Fl ` iN71!/tiO81AN5. RE: Fast Gas Station G86� � 800 East Highway 12 i`, Lodi , CA 95240 Dear Mr. Valenati : In response to your request, which was received December 2, 1985, I am enclosing the information regarding the remedial actions for the Fast Gas station on East Highway 12 in Lodi , CA. The data package submitted to your office on October 24, 1985 has the concurrence and the authorization of Mr. J.J. Elder, a registered professional civil engineer in the State of California, and states that the recovery system as installed is sufficient to accomplish the recovery. Furthermore, during the short period of the off-and-on operation of the recovery system, the pieziometric level of MW#10- dropped .28 feet from October 1 to October 12, 1985. The average pumping rate during this period was approximately 10,600 gpd with a maximum pumping capacity of 25,728 gpd• Still , a consistent radius of influence (cone of depression) could not be established due to the short pumping period and the seasonal rise of the un- confined groundwater table following the completion of the growing season. However, the positive effects of the recovery system were clearly seen in MW#10 and MW#13. ''Specifically, MW#10, which is located between the recovery well and the leak source, had an increase in phased fuel from 0.72 feet on October 1 , 1985 to 1 .67 feet on October 12, 1985. Also, MW#13, which is located beyond the recovery well from the leak source, had a decrease in phased fuel from 0.23 feet on .October 1 , 1985 to 0.18 feet on October 12, 1985. The amount of fuel recovered to date is approximately 25 gallons. As indicated by the monitoring data presented to you at our November 19, 1985 meeting, the amount of phased fuel in MW#10 and MW#13 has diminished to a slight film since your staff ordered the recovery system to be turned off on October 18, 1985. In addition, it should be emphasized that the information you have re- quested shall not have .an impact on the efficiency of the recovery system, but will only continue to delay the removal of the phased fuel and allow the soluable constituents to migrate further into the groundwater table. However, since you and your staff have reviewed the reports and feel the need for additional infor- mation, the following is submitted for your file: