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PUBLIC rIEALTH SERV ICES oP' —UAN <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D ., M.P.H., Acting Health Office <br /> C (0 <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 952 °4Foaa`� <br /> 209/468-3420 <br /> MAY 2 21997 <br /> LILA BILLHEIMER JERRY & MARLETA CASTRO <br /> J C SHAUGHNESSY ESTATE 4405 PACIFIC AVE <br /> 4405 PACIFIC AVE STOCKTON CA 95207 <br /> STOCKTON CA 95207 <br /> RE: Pacific Avenue Car Wash SITE CODE : 1215 <br /> 4405 Pacific Ave . <br /> Stockton , CA 95207 <br /> San Joaquin County Public Health Services , Environmental Health Division ( PHS- <br /> EHD) , has recently completed a review of this site and offers this evaluation for your <br /> consideration . <br /> Groundwater samples collected during the last field activities during July , August, <br /> September, and October 1996 indicate that high levels of petroleum contamination exist <br /> under this site . In order to advance through your required investigative phase and <br /> gather enough data to complete it, you will need to take steps to define the limits of <br /> both the soil and groundwater plumes . <br /> Further assessment is warranted northeast of soil probe boring P-8 and west of soil <br /> probe boring P-5 to determine the lateral extent of dissolved hydrocarbons . Monitoring <br /> wells should be placed at this site in locations that will provide the data to determine the <br /> groundwater gradient direction and delineate the extent of the petroleum in the <br /> groundwater. <br /> The placement of monitoring wells now should take into consideration any future <br /> possibility of existing underground tank replacement and excavation activities that may <br /> damage or cause the wells to be destroyed . Placing monitoring wells now, only to have <br /> them destroyed in the very near future because of known or suspected site construction <br /> plans , is not in the best interest of your required investigation or underground tank <br /> compliance issues . <br /> Such high levels of petroleum in the groundwater samples from soil probe borings P2 <br /> (TPH -G = 190 , 000 ug/I and Benzene = 10 , 000 ug/1) and P3 (TPH-G = 210 , 000 ug/I and <br /> Benzene = 15 , 000 ug/1) may indicate an ongoing release . The presence of MTBE in <br /> the groundwater sample from P3 at 1 , 000 ug/I could support the conclusion of a <br /> relatively recent impact. Efforts should be taken immediately to verify the tightness of <br /> your complete underground tank system (including product lines and dispensers) . <br /> A Division of San Joaquin County Health Care Services <br />