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3939 Gunbridge Rodd <br /> Suile 220 <br /> Cinrfron Park, C4 95682-9007 <br /> 7e] 5 30 676 6884 <br /> 16he(I <br /> Fax 5.30 676 6885 <br /> rf*oup- <br /> September 21, 1999 <br /> Project 791612 <br /> Mr Michael Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br />* 304 E Weber Ave, Third Floor <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Requirements at ARCO Facility 2130, 7906 North El Dorado <br /> Street, Stockton, California <br /> Dear Mr lnfurna <br /> On behalf of ARCO Products Company (ARCO), Pinnacle Environmental Solutions, a <br /> member of The IT Group (Pinnacle), is submitting this letter requesting a change in the <br /> groundwater monitoring requirements at the above referenced site The present <br /> groundwater monitoring program includes sample analysis for oxygenates using USEPA <br /> Method 8260 Review of the groundwater sample analytical results dating back to <br /> November 1997, shows that methyl tert butyl ether (MTBE) is the only oxygenate <br /> detected in groundwater samples, and MTBE concentrations are consistently below 10 <br /> micrograms per ltter Therefore, we propose to discontinue oxygenate analysis by USEPA <br /> Method 8260 Future monitoring events would utilize USEPA Method 8020 for MTBE <br /> analysis <br /> If you have any questions, please call <br /> Sincerely, <br /> Pinnacle <br /> el Coffman Mark Capps, R G <br /> Senior Project Supervisor Project Geologist <br /> cc Paul Supple, ARCO Products Company <br /> Mark List, RWQCB, Central Valley Region <br /> A Volpi and Son, Property Owner <br /> J 0 <br /> CP 1C Wch1velgrco1213010tr1yW1g299 dc,-98Vsg 1 <br />