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P r zt ! .77 property at 229 Moffat, only one (1) well would be needed; it should be placed within 10 -Feet of the removed 21009 gallon UST in a down gradient direction. Refer to Exhibit J for a copy of that letter. On May 20, i991, a meeting was held with the County EHD staff to review the status of the project, and discuss options. The County stated that their position had not changed, and that a F groundwater investigation would still be required. Due to the shallow depth of the water table, and the possibility of contam- ination from the UST, they would not issue a closure letter without the required work being done_ A letter from the EHD dated June 22, 1992, further clarified the County's staff position concerning the need for a monitoring well ; refer to Exhibit K for a copy of that letter. A workplan to accomplish that requirement follows. PROPOSED WORKF"LAN FOR INSTALLING A GROUNDWATER MONITORING WELL AT 260 SOUTH MAIN ST. , MANTECA, CA. The original site map sketch prepared by Thorpe Oil , (Exhibit L) indicated that the 2,000 gal UST, (#335,) was located 21 feet north of the storage shed and beyond the north edge of the larger warehouse structure. Although there are no recent surveys of the property, the San Joaquin Co. Assessor's map shows it to be 50' wide and 245' long on it's northern edge; (Plate 1.) A recent survey made by a licensed surveyor revealed that the northerly edge of the warehouse is approximately one (1) foot inside the property line. The distance from the north side of the storage shed to the edge of the warehouse was measured at 31 feet, which would put the diesel UST no more than 10 feet from the property line. Since it was not possible to obtain permission from the owners of the adjacent property to locate the well off site, it will be necessary to place it between the north property line and the site of the removed UST. This location, shown on PlatE V-11, will be dorm gradient from the UST site, but may to less than the desired 10 feet. The County EHD will be notified at least 48 hours in advance of commencement of all operations. PROGRAM: 1: The location of the proposed monitoring well is shown on 4