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' Diamond Manteca CA June 1993 Groundwater Monitoring Page 6 <br /> hydrolyzes to ethyleneglycol and bromoethanol (under neutral conditions and ambient temperature the half- <br /> life of the reaction is 5-10 days) <br /> 5 0 ANALYTICAL DATA <br /> Organic and inorganic analyses were performed by ACZ Laboratories (CA Lab #E609) Copies of the <br /> analytical data and chain-of-custody are provided in Appendix D The chain-of-custody clearly documents <br /> that the samples were shipped from California to Colorado and also indicates Sample Identification ("SRK- <br /> MWI-MAN") The top of the chain-of-custody form clearly states the name and address of ACZ <br /> Laboratories in Steamboat Springs, Colorado <br /> Table 2 includes all of the available groundwater data for the monitoring wells installed b <br /> g g Y <br /> BEI in 1989 and SRK in 1991 <br /> 5 1 Monitoring Wells SRK-MW1, SRK-MW2 and SRK-MW3 <br /> Constituents of BTEX are present in wells SRK-MW2 and SRK-MW3, while it was undetected in SRK- <br /> MW I Benzene and xylene levels are considerably higher than previously recorded at the location of MW2 <br /> and MW3, while toluene and ethylbenzene are slightly elevated <br /> Volatile hydrocarbons also increase significantly in wells MW2 and MW3, although they remained <br /> r undetected at MW 1 <br /> ' Lead levels ranged from 18 ppb at MW3 to 30 ppb at MW2, and illustrate a continuation of the contaminant <br /> trend to date <br /> 5 2 Monitoring Wells BEI-MW4, BEI-MW5 and BEI-MW6 <br /> As previously recognized, significantly elevated levels of BTEX and volatile hydrocarbons exist at the BEI- <br /> MW4 and MW5 locations, while BEI-MW6 has considerably lower volatile hydrocarbons (160 ppb) and <br /> only slightly elevated toluene (1 3 ppb) and xylene (5 9 ppb) Lead levels in MW4 and MW5 are also <br /> ' slightly elevated, at 8 ppb an 5 ppb consecutively <br /> 6 0 REGULATORY SITE VISITS <br /> ' Ms Margaret Lagoric, Senior REI1S with the Sar. lcaqum County PHS/E141) .,as on-site during the <br /> sampling of the three BEI monitoring wells, the equipment malfunction of the 2-inch submersible pump <br /> (SRK-MWI), and during the purging/sampling of SRK-MW3 using the 4-mch submersible pump and <br /> stainless steel bailer Ms Lagorto also observed steam cleaning/decontamination activities of the 4-inch <br /> submersible pump, tubing, and stainless steel bailer <br /> ' 31304 22U4My M- Steffen Robertson and Kirsten <br />