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k4 KLEIN FELDER <br /> File No. 20-3937-01 <br /> September 3, 1996 <br /> The only EPA Method 8260 analyte detected in any of the three groundwater samples <br /> obtained, was IS µg/l (a.k.a. parts per billion or ppb) of ],1-Dichloroethylene in the sample <br /> obtained from monitoring well MW-2. Monitoring Well MW-2 is Iocated near the former <br /> location of the U. S. Chemical ponds just north of the proposed Schaeffer site's northern <br /> property line. The concentration exceeds the maximum contaminant level of 0.006 mg/1 (6.0 <br /> Mcg/1) expressed in 22CCR §64444. However, 1,1-Dichloroethylene has been detected in <br /> groundwater within various properties of this industrial area. Additionally, 56 [Ig/I of TPH- <br /> Unidentified Extractable Hydrocarbons (in.the C I 0 to C24 carbon range) was detected in the <br /> groundwater sample obtained from monitoring well MW-2. The TPH-UEH is in the diesel <br /> hydrocarbon range but does not resemble the pattern of the diesel standard's chromatogram. <br /> No TPH-UEI-I was detected in any of the other groundwater samples obtained. Additionally, <br /> there is no MCL or SMCL for TPH-UEH in 22CCR Kleinfelder does not recommend any <br /> further investigation or clean-up at the proposed Schaeffer site. However, Kleinfelder <br /> recommends that a copy of this report be submitted to the RWQCB and PHS/EHD for their <br /> review and comment. Additionally, Kleinfelder recommends that a letter of "no further <br /> action" be requested :from both agencies (for that which is within their jurisdiction). <br /> Kleinfelder makes no legal recommendation or opinion as to the liabilities associated with <br /> these contaminants being present in groundwater. <br /> L <br /> 20-3937-011MR960189 Page 16 of 18 01996, Kleinfelder.Inc. <br />