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Harding Lawson Assactates o February 18, 1987 18040,001.03 The Southland Corporation 5820 Stoneridge Mall Road, 1310 Pleasanton, California 94566 Attention: Mr. Walt Lubcke Gentlemen: i Proposal Additional Monitoring Well Installation and Soil Sampling 7-Eleven Store 2243-20304 Tracy, California Harding Lawson Associates (HLA) is to -install:.an additional.monitaringPwelleando present this proposal provide soil sampling services relative to the gasoline leak at t.rour 7-Eleven facility in .Tracy. In response to a gasoline tank leak, the Southland a Corporation previously contracted HLA to perform an investigation which consisted of the installation of four monitoring wells at the perimeter of thero ert P P y, as well as chemical tests. Our t final report containing our preliminary conclusions and recommen- dations was presented an February 10, 1987. SCOPE OF SERVICES Our report recommends that additional field work and laboraitory s testing be performed in our evaluation of the lateral exter,+t of gasoline products. We bolieve that these additional studies should t include the following: _ `.. 1. Obtain a well pertriit from the San Joaquin Local Health District (SJLHO). ! 2• Drill and sample a boring -located at "the no the 7rtheast corner of -Eleven facilitY .to a depth of 20 feet (MW-5); this loca- tion is do wngradient of the tank that leaked 3• Install a 2-inch-diameter p flush threaded, Schedule 40 PYC Pipe. in accordance with the procedures of the San Joaquin Local Health District Sly s Engineers; 2430 Stanwell Dr.` Telephone Alaska Georo�sis 8 . Suite 110Colorado Texas 4151687-9660 Arizona Hawaii Geophysicists Concord.C494520 . California Nevada :i ✓ E