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-- GRO'UND�+VATER <br /> TECHNOLOGY, INC. Jr„�:a•- <br /> Ju r E..rtch[.J}:•Ili hx�r.C.,nrn�d.C.%!1J�11- �• <br /> November 19,1991 <br /> Project No. 020300163 8 , <br /> Mr.Glint Rogers ' <br /> Chevron U.S.A.Inc. DEC 5 !�S' <br /> P.O.Box 5004 <br /> San Ramon,CA 94583 Ef�V4P,()WEI�TAt HEALTH <br /> Subject: Underground Storage Tank <br /> Former Chevron Facility No. 9 0342 <br /> 1347 South El Dorado, Stockton, California <br /> Dear Mr.Rogers: <br /> On September 16.1991,Groundwater Technology, Inc.discovered the fill port of an underground <br /> storage lank at the former Chevron facility located at 1347 South El Dorado, Stockton,California(Figure <br /> 1,attached). The lank was monitored using an ORS Environmental Equipment Interface Probe. <br /> Approximately 1.3 feet of water and separata-phase hydrocarbons floating on top of sediments were <br /> detected in the tank The depth from surface grade to the top of the sediments was measured to be <br /> approximately 3.6 feet. Based on the approximate depth to the bottom,the tank appears to be 550- <br /> (. r gallons in volume. <br /> At the request of Chevron,seven samples of the water/separate phase hydrocarbons ~vera collected <br /> from the tank by Groundwater Technology on October 29,1991. The samples were submitted to a <br /> California-certified laboratory to be analyzed for benzene,toluene,ethylbenzene,total xylenes(l3TEX), <br /> total petroleum hydrocarbons (TPH)-as•gasofineand TPH-as-dieselby U.S.EPA Methods 8020 and <br /> 8015,oil and grease by EPA Method 5520,purgeable organics by EPA Method 8240,extractable <br /> organics by EPA Method 8270,cadmium,chromium, lead,zinc, and nickel by EPA SW-846 Method <br /> 6010,ignitability by SW-7.1.2.pH by EPA Method 9045,reactive cyanide by SW-7.3.3.2,and reactive <br /> sulfide by SW-7.3.4.2 17he laboratory reports are attached. <br /> if you have any questions cr require additional information, please do not hesitate to contact Greg <br /> Mischel or me at(510)671-2387. <br /> Sincerely, <br /> GROUNWATER TECHNOLOGY, INC. <br /> Greorr A.Mischel <br /> Project Geologist <br /> --- —=--.---——---Sandra L.-Undsey—-- <br /> Project Manager <br /> GM;SLL;gm <br /> Attachments:Figure 1,Laboratory Reports <br /> r!.'!n'.'s i^!•r,iRr••u;.:r, ! �.l-.url,i.nu:.i lh'.'.••.ala - .. - <br />