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j ate. i 6: San Joaquin Kcal Health District Re: Laura Scudders July 12, 1M9 Page T+vD The inorganic lead analysis for T-1 East indicated a lead content of 61.3 ppm. lfie inorganic lead analysis for T-1 West indicated a lead content of 54.2 ppm. As a means of remediation and further data gathering, we propose } to excavate to a depth of fifteen feet within the confines of the existing excavation. approximately 81W x 161L . Approximately nineteen yards of material will be remmaved in this process. All soils removed will be stockpiled in a secure area on a sheet of visqueen. The soil will then be covered with visqueen until disposal cars be arranged. Two soil samples will then be extracted at the 15' depth by ROY F. Weston Iabs. Additionally, one rmare sample will be extracted at a depth of 2' from under the existing asphalt cover approximately 50' from the tank 1 pit. This sample will be to verify any existing background levels of lead on the site. All samples will be analyzed for total inorganic lead content. Upon receipt of sample results a plan for further work will be submitted, or a request to coplete the closure. 3) Tank 3 Pipeline A 2" steel diesel fuel product line fran tank #3 to the northwest corner of the truck shop was removed on My 30, 1989. The length of the prod-act line was in excess of 200 feet. (See site map) . Thirteen soil samples ;here collected by Roy F. Weston Labs, All thirteen were ooilerted at a depth of two feet below grade_ All samples are identi- fied as P-1-P-12A as well as dispenser A, or P-l-P-12B and dispenser B. All "A" samples were analyzed using EPA standard 8020. All "a" samples were analyzed using EPA standard 8015 modified. Under the 8015 modified, only sample 12-B contained a total petro- leum hydrocarh n value. '[his value is 24 ppm. Under the 8020 standard, samples P2 A, P2-4, P7 A, P8-A, P9 A, P10-A, Pll-A, P12-A and dispenser A indicate slight values for Tolulene. As a means of .remediation arO further data .gathering we propose to. - excavate the product line trench to a depth of four.feet frau grade. All excavated material will be stockpiled_on visqueen in asecurearea with a sheet of visqueen covering the soil. Five sail samples will be collected along the trench at the direction of a San Joaquin Incal lk alth District representative. All sarples will be analyzed under EPA sta-idard 8015 modified and 8020 by Roy F. Weston