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' Diamond Lodi,CA-lune 1993 Groundwater Monitoring Page 5 The analytical parameters include volatile hydrocarbons (by EPA 8015 M,GC/FID Purge&Trap), benzene, toluene, ethylbenzene, and xylene (BTEX) (Aromatics by EPA 60218020, GC/FID Purge & Trap); filtered lead 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 perfonned. by ACZ Laboratories (CA Lab #E608). Copies of the ' analytical data and chain-of-custody are provided in Appendix C. The chain-of-custody clearly documents that the samples were shipped from California to Colorado and also indicates 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. Copies of the analytical data for the municipal wells are provided in Appendix D. Copies of the purging logs are provided in Appendix E. iTable 2 includes all of the available groundwater data for the monitoring wells installed by SRK in 1991. TABLE 2: Analytical Groundwater Data �4v r3S #49t, Ap ,1. I #2.. $umber 1,_,L942 sbtvsrF' ,1993,.:; )une2$,3943...:< ' Stuffkk SKk SAT{ STS $RIE Ss22� K�. 5£tll. 5R3C SRic SRir SHSC 5n -S>RK h31Y2 141 : I► Y3 AWL Rf1'3, 34 W1 ,diw2 hE}Y3 X9 1 iFf3VZ 7V1'3: ' Volatile Hydrocarbons <50 150 <50 <50 150 150 QO N5 QO QO QO 120 Q0 QO QO Benzene <0.5 <0.5 <0.5 <05 <0.5 <0.5 Toluene <0.5 0.82 0.63 <0.5 <0.5 <0.5 <0-5 1 NS 1 <0.5 <0.3 <0.3 <0.3 <0.5 <0.5 <0.5 ' Ethylbenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NS <0.5 <0.3 <0.3 <0.5 <0.5 <0.5 Xylenes <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NS <0.5 <0.3 <0.3 4P <0.5 <0.5 <0.5 Lead 53 <0.5 <0.5 33 260 93 12 NS 170 3 69 122 11 18 <1 ' NOTES: Ns= Not sampled because of slow recharge after purging resulting in an insufficient quantity of water necessary for sampling. NO= Analytes reported as ND were not present above detection limits. All units in ppb. ' 6.0 REGULATORY AT Y SI TE VISIT Ms. Margaret Lagorio, Senior REHS with the San Joaquin County PHS/EHD was on-site during the sampling of the three monitoring wells. Ms. Lagorio was informed of the malfunctioning peristaltic pump ' which precluded field filtration activities, however, Ms. Lagorio stated that off-site filtration would be satisfactory. tzyoi,z+u-Wyt.oa Steffen Robertson and Kirsten