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/T d BI: Iftowo and Caldwell Consultants 723 s streettic; C F"In ft V Sacramento Uffomia 95814-7092 (916)444-0123 1 t� `r U L � � 1992 FAX(916)444W7 ENVIRQNMEN7AL HCArF.TH PERMIT/SEpVICES July 30, 1992 Ms Laurie Cotulla, REHS San Joaquin County Public Health Services Environmental Health Division Post Office Box 2009 1601 East Hazelton Lane Stockton, California 95201 017-6746-02/1 Subject Additional Soil Investigation, ARCO Station 2133, Stockton, California; Site Code 1021 Dear Ms, Cotulla On behalf of ARCO Products Company, this letter is in response to your letter of May 27, 1992, to Mr. Chuck Carmel of ARCO Products Company, winch requested a work plan to further define soil contamination at the subject site This letter was the result of a May 7, 1992 telephone conversation between Ms Mary Meays of your office and Mr. Steve Misner of Brown and Caldwell Consultants (BCC) At issue is the fact that Ms Meays does not feel that the soil contammation at the site has been adequately defined, especially in the southwest portion of the site Her assertion is based on data contained in BCC's 1987 investigation report She states that soil samples from borehole AS-7 contained significant hydrocarbon concentrations As a result, she requested further definition in the southwest comer of the site Upon review of BCC's June 10, 1987 Problem Assessment Report, it was noted that Table 4-4, which reported the results of the soul sample analysis, was in error for the EPA 602 results The results for the EPA 602 analysis were actually in micrograms per kilogram and not milligrams per kilogram The EPA 602 title in Table 4-4 should have been superscripted with the letter "C". A revised table 4-4 is enclosed with this letter as well as copies of the laboratory data sheets Based on the revised data, significant hydrocarbon concentrations were not present in soil samples from AS-7, nor for that matter, m any of the AS series boreholes Please note that all of the soil samples labeled "A" on Table 4-4 show non-detect for all hydrocarbon constituents The "A" samples were taken from five feet below ground surface. The only hydrocarbon hits were from the "B" samples, winch were taken any where from 10 to 115 feet below ground surface Sample AS-7B was taken from 11 to 115 feet below ground surface Groundwater beneath the site on the day the samples were collected from the 674&CORRESP�67464)2 L2