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Ms.Margaret Lagorio, SJCEHD November 30,2007 Work Plan for Additional Assessment Project No.2033-15688-01 15688 Harlan Road, Lathrop, California Page 2 According to H2OGEOL's report dated May 10, 2007, two steel USTs were discovered during hotel construction activities in early 2007 and were probably installed prior to 1950 and likely covered in the 1960s upon closing of the "Wiggins Store". A land survey of the vicinity of the USTs was conducted by Hawkins & Associates Engineering on March 29, 2007 (see Attachment A). From this survey, it appears that the former USTs straddle the property line between Mr. Dhoot's property and the City's right-of-way at the extreme southern edge of the Mr. Dhoot's property. According to San Joaquin County Assessor's records, a triangular portion (measuring 30 feet by 42 feet by 40 feet) of the original parcel "was conveyed to the county of San Joaquin by deed recorded September 6, 1973 in Book 3800, Page 39, San Joaquin County Records" (see Attachment B). According to Margaret Lagorio of SJCEHD (in a telephone conversation with Sarah Salcedo of Stratus on October 4, 2007), the City of Lathrop assumed ownership of the land from the County of San Joaquin at the time the City became incorporated. SUMMARY OF PREVIOUS WORK On April 25, 2007, Walton Engineering removed two steel USTs and associated piping from the site, under SJCEHD direction. According to SJCEHD staff field notes, each UST was approximately 42 inches in diameter and 50 inches in length and the bottom of the tanks were at a depth of about 5 feet bgs. The excavation to remove the USTs measured 12 feet by 15 feet. Approximately 14 feet of piping (which exited the USTs on the west side and bent north before ending) was also removed at this time. During the removal activities, a total of approximately 14 cubic yards of soil was removed from the UST and piping excavations. Copies of SJCEHD notes/documentation of the UST removal activities are included as Attachment C. Following UST and piping removal activities, a representative from H20GEOL of Livermore, California, was on-site (April 25, 2007)to collect soil samples. According to H2OGEOL'S Report on Tank Removal Related Soil Sampling, South of Joe's Travel Plaza, Northeast Corner Intersection Harlan Road and Thomsen Street, Lathrop, California, dated May 10, 2007, a total of six soil samples were collected. Two samples were collected in native soil about 2 feet beneath the center of the former UST inverts (S1 and N2), two samples were collected in native soil about 2 feet beneath nearby piping locations (PLS and PLN), one sample was collected from soil inside one of the USTs (30% collapsed and filled with lose sandy soil; sample called `SOIL IN N TANK') and one sample was collected from the stockpiled soil that was removed during uncovering of the USTs. No map depicting the exact locations of the samples was included in H20GEOL's report. An estimation of where these samples were collected, based on field notes from SJCEHD,are shown on Figure 3. KNoe's Truck Plaza\Work Plans\Joe-s Truck-SOUTH PARCEL-WP for Site Assessment 11-30-07.doc 57TATUS