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Diamond Lumber Manteca Quarreriy Groundwater Monitonng -, Page 6 The analytical groundwater samples were collected from the end of the PVC tubing (SRK monitoring wells) and from the tops of the teflon bailers (BEI monitoring wells) and poured directly into laboratory grade sampling containers 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 Field Groundwater Purging/Sampling Logs are provided in Appendix A. +� Copies of the Geologic Logs and Monitoring Well Construction Diagrams are provided in ® Appendix B The analytical parameters include volatile hydrocarbons (by EPA 8015M, GC/FID Purge & Trap), benzene, toluene, ethlybenzene, and xylene (BTEX) (Aromatics by EPA 602/8020, GC/PID Purge & Trap), and total lead (EPA Method 239 2 GFAA) 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 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) SRK requested further guidance and justification from Ms Margaret Lagorio, Senior RENS, San Joaquin County PHS/EHD, prior to the August 1992 sampling event, however, no response was received by SRK from the PHS/EHD during or after the sampling event 6 0 ANALYTICAL DATA analyses were performed b ACZ Laboratories CA Lab #E608 Copies of Organic and inorganic analy p y ( ) p the analytical data and chain-of-custody are provided in Appendix C The chain-of-custody states that the groundwater samples were received by the laboratory in good condition at 4 C The chain-of- custody clearly documents that the samples were shipped from California to Colorado and also indicates Sample Identification ("SRK-MW1-Man") The top of the chain-of-custody form clearly states the name and address of ACZ Laboratories in Steamboat Springs, Colorado The constituents of BTEX or volatile hydrocarbons were not detected in SRK monitoring wells SRK- MW1 or SRK-MW3 The constituents of BTEX were detected at very low levels in SRK monitoring well SRK-MW2 (Benzene 2 ppb, Ethylbenzene 0 8 ppb, and Xylene 0 6 ppb), while volatile hydrocarbons were detected at 0 10 ppm Lead concentrations ranged from 100 ppb in SRK-MW2 to 14 ppb in SRK-MW3 Elevated levels of BTEX and volatile hydrocarbons were detected in monitoring Ele Y g wells BEI-MW4 through BEI-MW6 Volatile hydrocarbon levels ranged from 10,000 ppb in BEI-MW6 to 360 ppb in BEI-MW4 Benzene concentrations ranged from 6,100 ppb in BEI-MW5 to 68 ppb in BEI-MW4 Toluene levels ranged from 940 ppb in BEI-MW5 to 62 ppb in BEI-MW4 Ethylbenzene levels ranged from 7,000 ppb in BEI-MW5 to 640 ppb in BEI-MW4,while xylenes concentrations spanned Steffen Robertson and Kirsten