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I ' INamond Lumber Manteca Quarierty Groundwater Momtortag Page S pump and tubing from coming into contact with the pavement between sampling each well The purged water was pumped into 55-gallon drums located adjacent to the three SRK monitoring wells The drum lids were securely fastened after each well was sampled Three casing volumes were purged from each of the BEI monitoring wells using dedicated disposable bailers equipped with nylon cord The purged casing volumes were measured in a calibrated bucket, then emptied collectively into a 55-gallon drum located near BEI-MW5 The drum lid was securely fastened after the three BEI wells were sampled iAfter more than 5 casing volumes were purged from each of SRK monitoring wells, the analytical groundwater samples were collected from the end of the PVC tubing After more than 3 casing volumes were purged from the three BEI wells, the analytical groundwater samples were collected from the tops of the dedicated teflon bailers Analytical water samples from both the SRK and BEI monitoring wells were preserved in laboratory grade sampling containers The analytical groundwater samples were placed in a cooler containing additional frozen blue ice packets and shipped following strict chain-of-custody procedures to a California certified laboratory (ACZ Laboratories) for analysis These samples were collected after the Ph, temperature and conductivity had stabilized "Stabilized" is defined as three consecutive readings within 15% of one another Copies of the Geologic Logs and Monitoring Well construction Diagrams are provided in Appendix C Copies of the purgingisampling logs are provided in Appendix D In review of recent correspondence from San Joaquin County PHS, we concur that samples during future monitor events will be collected using hand bailing techniques following completion of well purging activities The analytical parameters include volatile hydrocarbons (by EPA 8015M, GC/FID Purge & Trap), benzene, toluene, ethylbenzene, and xylene (BTEX) (Aromatics by EPA 60218020, GC/FID Purge & 1 Trap), and total lead (EPA Method 239 2 GFAA) ' Ethylenebromide (EDB) was not included in the suite of analytes, because EDB degrades in soil very rapidly (EDB is converted almost completely within 2 months to ethylene) and also in water, where it hydrolyzes to ethyleneglycol and bromoethanol (under neutral conditions and ambient temperature the half-life of the reaction is 5-10 days) 5 0 ANALYTICAL DATA Organic and inorganic analyses were performed by ACZ Laboratories (CA Lab #E608) Copies of the analytical data and chain-of-custody are provided in Appendix E The chain-of-custody clearly documents that the samples were shipped from California to Colorado and also indicates Sample Identification ("SRK-MWl-MAN") The top of the chain-of-custody form clearly states the name and address of ACZ Laboratories in Steamboat Springs, Colorado �} Table 2 includes all of the available groundwater data for the monitoring wells installed by BEI in 1989 and SRK in 1991 �� 32504 22\4 aur Steffen Robertson and Kirsten