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Department of Toxic Substances Control <br /> Aqn c,avid,Ph.D. $600 Cal Center Prive Annold Sdnwrunegger <br /> sePaAban Seaarnento,California 66826-3200 Gowmdr <br /> TO: Jerry LEfe <br /> Project Manager <br /> Northam California Site Mitigation Branch <br /> 8800 Cal Center Drive,2nd Floor- <br /> Sacramento, <br /> loorSacramento, CA 95828.32//00 n <br /> FROM: Karen W, 0181aslo, Ph.15.7� a <br /> Staff Toxicologist <br /> Science, Pollution Prevention and Technology Program <br /> Human and Ecological Risk Division <br /> DATE: February 2, 2005 <br /> SUBJECT: DELTA GATEWAY APARTMENTS f L&M OPERABLE UNIT-HRA <br /> PCA Code: 11050 Site Code: 101350 WP:00 <br /> BACKGROUND <br /> • The Human and Ecological Risk Division (HERD)was requested to provide ongoing <br /> toxicology and risk assessment support for Dena Gateway Apartments(Site)by the Site <br /> Mitigation Program at the Region 1 Sacramento office. The Site is located in the City pf <br /> Stockton,California. The Stte Is six aces in size and was formerly used for storage and <br /> as a distribution point for petroleum hydrocarbons off-leaded from ships hi the Port of <br /> Stockton. in the early 1980's,the Delta Gateway Apartments were constructed on the <br /> western and southern portions of the L$M OU, There appears to be no evidence that the <br /> Stoddon Redevelopment Agency(RDA)conducted any environmertal investigation of the <br /> Site prior to the construction of the Deb Gateway Apartments. Previous sampling and <br /> analyses have ldent(Fled dissolved and separate-phase petroleum hydrocarbons in soil <br /> and groundwater as well as volatile organic compounds(VOCs)including fuel <br /> constituents such as benzene, ethylbsnzsne,toluene, and xylenes(BTEX), chlorinated <br /> dolvents, semiWofattle organic compounds(SVOCs), including polynuclear aromatic <br /> hydrocarbons(PAHs); and, metals(notably arsenic in groundwater and both arsenic <br /> and lead in soil). Methane has been detected in soil gas above the lower explosive limit <br /> (LEL)arty also in groundwater. Sol[gas analyses have Confirmed the presence of <br /> VOCs such as petroleum hydrocarbon fuel•constftuents Including 8TEX,confirmed the <br /> presence of chlorinated solvents and Identified vinyl chloride contamination, and <br /> identified hydrogen sulfide contamination. Groundwater occurs at 8 to 17 ft below <br /> ground surface (bgs) and according to the CVRWQCB flow Is variable although <br /> generally to the southeast away from Mormon Slough and the Stockton Channel. <br /> . ,, Prinud on Raeydvd Paper . <br />