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Ralph's Square 9 - 2 - 18 3 July 2014 <br />2122 S. Airport Way, Stockton <br />San Joaquin County <br />petroleum impacts in the overlying soils. Soils should be properly logged using the <br />Unified Soil Classification System, and lithologic contacts but the additional cost for <br />laboratory analysis are not warranted. <br />4. Please add analysis for naphthalene to the list of petroleum hydrocarbons to be <br />analyzed in groundwater samples collected from this site. Naphthalene is a common <br />constituent in gasoline and is a possible human carcinogen. <br />In summary, please submit the following: <br />• Results of well installation and groundwater sampling in the next monitoring report due <br />30 October 2014. <br />Please do not hesitate to call me at (916) 464-4619 or by email at <br />ccondon(a.waterboards.ca.gov if you have any questions or concerns. <br />CORICONDON <br />Senior Engineering Geologist <br />cc: Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br />Peter Manion, Hakeem, Ellis & Marengo, 3414 Brookside Rd., Ste. 100, Stockton 95219 <br />Daniel Villanueva, Advanced GeoEnvironmental, Inc., 837 Shaw Rd., Stockton 95205 <br />