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1 <br /> 1 <br /> ~ L t7n ,Stolt ',S Market <br /> 1 1561,5 Seventh Street, Lathrop, Calit'or►ria <br />' Interim SecondarSource Removal & <br /> Monitoring Well Replacemen! <br /> 1 <br /> 1 <br /> 1.0 Projeet Identiflicrrtion <br />' Tlus project involved the removdl ctl' gasoline contarmnated soil gild groundwater <br /> associateca with the forniwr underground t ink failure at Langston'-, Nfarkct, 15615 SI-1-Tenth <br /> Street, Lathrop, California (Figure 1) lilso im olved was the re-iri.,tallaiion of the f <br /> groundivater monitoring, wells that were destroyed due to the e,cavation arli%ity <br /> 2.0 Site Description and History <br /> IA preliminary environmental investigation of the property was compli~,ted by ?Murray &/ <br /> Assocu:k,,; at the request of Mr L�ing,,ton to April 1932 flu, prelimirnary mmrP,�tigation <br /> I included the dtilling of several exploratnr; sort borings by hand auger and rotary hammer <br /> in the vicinity of a failed 4,000 gallon underground gasoline tank (UST') The tank Failure <br /> occuircd in June 1990 following a hellam,, pressure test Approximately 1,200 gallons of <br /> unleaded gasoline was lost froin the tank <br /> The purpose of the preltniina,y investigation was to quick.y and inexpen.ively evaluate the <br /> Iextent of soil contamination as a result of the U5T failure and to determine the potential <br /> for groundwater contamination The investigation consisted of manually drilling eight 2-✓ <br /> inch diameter soil borings to a depth of t 7 feet Groundwater at the Site is encountered at <br /> t a depth of 17 5 to 18 feet The borings demonstrated that soil contamination in the <br /> vicinity of the former UST extended clown to the capillary fringe zone, and the water <br /> table, with little lateral spreading Figure 2 showe, the lateral extent of both the soil and <br /> groundwater contaminabon as determined by the April 1092 im estigation Although no <br /> groundwater mon,toring %vL]ls were installed at that time, soil -apor sample, were <br /> collected fi oni above the water table In All bot inns and 5i,..cened in the. field usjia s a S80B <br /> OVM Although not conclusive, this prelinunar; investigation pro; ded a reasonable <br />