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Diamond Lumber-Lodi Quarterly Groundwater Monitoring Pae 6 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 hydrolyses 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 this sampling event, however, no response was received by SRK from the PHS/EHD during or after the sampling event. 6.0 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 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 illustrate Sample Identification ("SRK-MW1-Lodi"). 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 y monitoring wells SRK- MW1 or SRK-MW3. As previously mentioned, monitoring well SRK-MW2 was bailed dry after one casing volume was removed, and did not recharge sufficiently after purging. No sample was collected from SRK-MW2. Lead concentrations were 12 ppb in monitoring well SRK-MW1 and 170 ppb in monitoring well SRK-MW3, respectively (both analyses following EPA 239.2 GFAA). Table 2 includes all of the available groundwater data for the monitoring wells installed by SRK in 1991. TABLE 2: Analytical Groundwater Data t+Fove�tic,�r 75;'19J1. A�tt 7: IJP . .. >`f Seplem�:l 1rJ1J2 SRK SRK SRK 5RK SRK SRK 5RK SRK SR]C» MWt MW2 MW3 M�V1 MW2`: MW3 MWI ;MW2 MW3 Volatile Hydrocarbons ND ND ND ND ND ND ND NS ND Benzene ND ND ND ND ND ND ND NS ND Toluene ND O.82 ppb 0.63 ppb ND ND ND ND NS ND Ethylbenzene ND ND ND ND ND ND ND NS ND Xylenes ND ND ND ND ND ND ND NS ND Lead 53 ppb ND ND 11 33 ppb 260 ppb 93 ppb 12 ppb NS 170 ppb NU S: NS = Not sampled because of slow recharge after purging resulting in an insufficient quantity of water necessary for sampling. ND Analytes reported as ND were not present above detection limits Detection Limits: Volatile Hydrocarbons 50 ppb (durin; November 1991 & April 1992 sampling events) Benzene 0.02 ppb (during August 1992 sampling event) Toluene 0.5 ppb Ethylbenzene 0.5 ppb Xylenes 0.5 ppb Lead 5 ppb during November 1991 & April 1992 sampling events) 1 ppb (during August 1992 sampling event) Steffen Robertson and Kirsten