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HEALTH 'SERVICESoa�� <br /> Al <br /> .c <br /> PUBLIC �. � .oG <br /> SAN JOAQUIN COUNTYfl 40: <br /> a ?� <br /> `:JOGS KHANNA M.D.,M.P.H. <br /> Health Officer P <br /> P.O. Box 2009 • (1601;East Hazelton Avenue) •Stockton, California 95201 <br /> Q4�iF0��` <br /> (209) 468-3400 <br /> S <br /> CSP <br /> BRETT HUNTER <br /> CHEVRON USA PRODUCTS COMPANY <br /> P O BOX 5004 APR 15 1993 <br /> SAN RAMON CA 94583-0804'; <br /> RE: 5608 NORTH PERSHING AVE SITE CODE: 1786123 <br /> STOCKTON CA <br /> San Joaquin County Pubilic Health Services, Environmental'; Health <br /> Division (PHS/EHD) has '.completed the review of the "Soil <br /> Excavation/Remediation..Workplan" , dated April 8, 1993, prepared <br /> by Touchstone Developments, and has the following comments. <br /> Any mobile laboratory used on-site for the purpose analyzing <br /> confirmation soil sampl'�es must be certified with the State of <br /> California Department orf Health Services (DHS) for all analyses <br /> the laboratory will be ,performing. The laboratory must be able <br /> to run all applicable quality control/quality assurance as <br /> required by DHS and the supporting documentation must be <br /> submitted to PHS/EHD along with the analytical results. ; in <br /> addition, the laborator,`y .must be able to obtain sufficient <br /> detection limits as recommended in the Tri-Regional Guidelines. <br /> r <br /> The confirmation soil samples taken from the former gasoline tank <br /> pit area should be analyzed for total petroleum hydrocarbons as <br /> gasoline, benzene, toluene, ethylbenzene and xylene. The method <br /> used to extract the hydrocarbons should be by purge and trap (EPA <br /> method 5030) . <br /> The confirmation soil samples taken from the former waste oil <br /> tank pit area should be analyzed for .total petroleum hydrocarbons <br /> as gasoline, benzene, toluene, ethylbenzene, xylene, total oil <br /> and grease, cadmium, lead, nickel, chromium, zinc, and for semi-- <br /> volatile organics (EPA �`method 8270) . ' <br /> The area where the piping sample P-1 was obtained will need to be <br /> addressed during the site work, as 0. 048 parts per million xylene <br /> was detected in that sample. The area will need to be assessed <br /> to determine if the contamination noted is limited in scope or is <br /> more extensive. <br /> The soil to be excavated.,must be covered as soon as working <br /> conditions allow. The cover should be checked periodically <br /> A DiviMan of San Joaquin County Health fare Services <br />