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i 10 April 2002 AGE-NC Project No 97-0333 Page 2 of 3 man-hole located immediately southeast of the treatment system (Figure 2) AGE installed a model i+-2000, Blue-White Industries flow meter at the effluent sampling port to measure discharge into the sarutary sewer system During the start-up period (equal to 69 days), approximately 261,902 gallons of treated water was extracted and discharged to the City of Manteca sanitary sewer system under CMPWD Industrial Wastewater Discharge Permit No 02-1 (Table 1), or equivalent to approximately 3,795 gallons per day During the start-up period, grab water samples were collected from the treatment system on a daily basis for the first two weeks, followed by weekly sampling for one month Grab water samples of ground water pump-and-treat influent, intermediate and effluent water were collected from valved sampling ports located upstream(influent),between the second and third media vessels(GAC-2) and downstream (effluent) of the treatment unit Grab water samples were collected utiliz ng 1-liter amber bottles and 40--ml EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative All samples were logged on a chain-of-custody form, placed in a chilled container and transported to a California Department of Health Services (DHS)-certified laboratory for analysis for • - Total pctraIcom hydrocarbons quantified as gasoline and diesel (TPH 4� end I PH d respcitively) by FPA Methods 35501503018015 Modified, • B,nzene,toluene, ethyl benzene and -�ylcne(BTEX)with methyl- ertiary butyl ether(MTBE) by EP k Mcthod 8020, • Tetrachloroethene (PCE), sichloroethene (TCE), Tertiary butanol (TBA), di-isopropyl ethe- (DIPE), ethyl tent butyl ether (ETBE), tent amyl methyl ether (TANTE) and MTBE by 1✓PA Method 8260 Modified, and • Total lead by EPA Method 6010/200 7 total of fifteen sampling events were conducted at the site during the start-up period Influent water samples detected TPH-g at concentrations as high as 39,000 micrograms per liter (,ug/1), BTEX constituents as high as 6,000 4g/l and MTBE at concentrations as high as 95,000 ug/l, TCE and PCF wcse detected during one occurrence at concentrations of 8 4g/l and 45 ,g/l, respectively Low concentrations of TPH-d, 'MTBE and TBA were detected from intermediate (GAC-2) water samples on five occurrences at concentrations as high as 280 µyl No constituents of concern were detected from effluent water samples Analytical results of start-up orab water samples are surnmanzed In l able 2, the laboratory reports (McCampbell -knalytiLal lnc L Advanced GwEnviroomentai Int