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First Quarter 1998 Monitoring and Sampling Report 2 The Southland ion 4501 North Pershing Avenue Stockton CA ftol30 1998 ' No separate-phase hydrocarbons(SP)were observed In any of the groundwater monitoring wells during this monitoring event A potentlometnc surface map was prepared using the groundwater elevation data collected from the fire monitoring wells on March 22, 1998 (Figure 2) Based on the potentiometric surface map,groundwater flow is toward the northeast at an approximate gradient of 0 005 to 0 007 feet per foot Groundwater monitoring results for March 22, 1998 and historical monitoring results are presented in Table 1 (Attachment 2) Field data sheets are Included in Attachment 3 tPrior to purging dissolved oxygen levels were recorded In each well Dissolved oxygen levels ranged from 019 milligrams per liter(mg/L) In wells MW-1 to 0 40 mg/L In well MW-3,Indicating oxygen depletion ' Dissolved oxygen data for wells monitored on March 22, 1998 are presented in Table 1 Monitoring Well Sampling and Analytical Results On March 22, 1998,groundwater samples were collected from five monitoring wells Before sampling, at least 4 well-casing volumes of groundwater was removed from each monitoring well unless the well was ' purged dry The groundwater samples were collected using disposable bailers Groundwater samples were placed in analysis-specific containers with analysis-specific preservative The samples were then sealed using Teflon septum caps, labeled with the job Identification number,the sample number,date, fame, and type of laboratory analysis required The samples were stored on ice and transported with a chain-of-custody record to state-certified Core Analytical Laboratory,In Anaheim,California Groundwater samples were analyzed for BTEX and TPH-G using Environmental Protection Agency(EPA) methods 8020/modified 8015,and for oxygenates MTBE,TBA, DIPE, ETRE, and TAME using EPA method 8260 Analytical results for the March 22, 1998,sampling event and historical laboratory analytical results are summarized in Table 1 Highest dissolved benzene and TPH-G concentrations were reported in well MWA at 2,200 micrograms per Inter(pg/L) and 23,000 pg/L, respectively MTBE was detected in groundwater from three wells,MW-1,MW 1A, and MW-4 at concentrations of 11,000 pg/L, 360 pg/L, and 3,100 pg/L, respectively The laboratory analytical reports for the groundwater samples are included In Attachment 4 ' Purgewater Disposal All purgewater generated during this First Quarter monitoring and sampling event was stored in 55-gallon ' Department of Transportation (DOT)-approved drums Approximately 65 gallons of purgewater water, generated during the this sampling event will be transported from the site during the second quarter of 1998, by Belshire Environmental Services, Inc and later transported by Nieto & Sons to DeMenno Kerdoon ' in Compton, California for treatment and disposal ' FLUOR DANIEL GTI ' CJ