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h4.KLE,INFELDER i File No. 20-3961-01.PO1 August 14, 1996 7 SOIL AND GROUNDWATER SAMPLING AND ANALYSIS During our June, 1996 site reconnaissance, a piezometer (or monitoring well) was discovered on site. The piezometer appeared to be in a state of disrepair. The piezometer was not visible during our March, 1996 site reconnaissances for OPUS Development because of extensive weed growth. Following the discovery, Mr. Toni Rocca of AMB BTS 3 L.L.C. contacted Mr. Richard Oliver of Dividend Properties. According to Mi. Rocca, Mr. Oliver was not aware of the piezometer's existence and gave authorization to Mr. Rocca for Kleinfelder to cut the padlock on 4 the well's riser vault and sample tl�e well. Therefore, Mr. Rocca authorized Kleinfelder to cut the lock, sample the piezometer, and obtain a soil sample from the southwest corner of the'property. The well may be the Toxic Technology, Inc. (TTI) Monitoring Well No. 1 (MW-1) detailed in a TTI report dated July 22, 1991. One soil and one groundwater sample were submitted under chain-of-custody procedures to Chromalab, Inc. of Pleasanton, California. Chromalab is a State of California Department of Toxic Substances Control (DTSC) certified laboratory for the analyses requested. 4 Subsequent chemical analysis of the water sample obtained revealed no detectable, benzene, toluene, ethylbenzene and xyleness, Total Petroleum Hydrocarbons as referenced tgasoline (TPH-G), Total Petroleum Hydrocarbons as referenced to kerosene (TPH-K), Total Petroleum Hydrocarbons as referenced to diesel (TPH-D), and Total Petroleum Hydrocarbons as referenced to motor oil (TPH-MO). Chemical analysis of the soil sample obtained revealed 18 d mg/kg total lead, 26 µg/kg 4,'4'-Dichlorodiphenyltrichloroethane (DDT), 28 µ'/kg 4,'4'- Dichlorodiphenyldichloroethylene, (DDE) and 11µg/kg 4,'4'-Dichlorodiphenyldichloroethane- a (DDD). The concentration of lead is non-hazardous when compared with the Total.Threshold Limit Concentration (TTLC) regulated level as expressed in 22 CCR §66261.24 and is less than 10 times the Soluble Threshold Limit Concentration (STLC) regulated level expressed in 22 f CCR §66261.24 for hazardous waste classification. Kleinfelder's experience in thearea of the project site would lead us to believe that the lead concentration is likely naturally occurring at that concentration. The concentrations of DDD, DDE, and DDT total 65 µg/kg which are also less than the TTLC regulated level expressed in 22 CCR §66261.24 (1,000 µg/kg) and less than 10 times the STLC regulated level of 0.1 mg/l (or 1,000 pg/kg). It is Kleinfelder's experience that the concentrations encountered in the sample are likely associated with residual from previous application of pesticides to the property. Kleinfelder currently has no reason to suspect that the low concentrations are the result of any type of spill. Furthermore, it is Kleinfelder's experience that similar residual concentrations of DDD, DDE, and DDT are preser►t in other farming areas of the San Joaquin Valley. 20-3961-01TOIA IR960166 Page 41 of 48 Copyright 1996, Kleinfelder. Inc,