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ts FINAL REM BDLAMON PLAN SheJ gel Company r� 620 wta Charter Way,Stockton,CaUrars3s Delta Project No.404&586 Page 14 e 'Mist rdmralti'm".a regulatory access to system far Inspection. o Must have lregulataq-viroved monitoring epd rr mpling schaddle. o t y-staitil moat ba well An datained, ! is The pump test performed at this site Indicates that the TPH discharge concentration (average 20 ppm) would meet the <100 ppm requirement without using any pretreatment. The average TTO discharge t rIncentraUun (7.54 mgA)determined during the pump test is above ft required 4.57 mg,7 limiting value. r:a z5 a 1nttf&nm platad 1low Met I'S 2A gpdt for tiro arift pumping system. The number of pounds of TTO that would be discharged would be approximately 0.2 lbs/day (see Appendix d for TTO discharge .r calculations). Even though the mass flow rate of the TTOs would be small, the City requires that the c , concentrations of TTt]s be below 4.57 mgll prior to discharge to the sanitary sewer system. This means that the ata � � k Taking the above inLormation into consideration,three ground water treatment alternatives were screened: td F + Activated carbar_ ' s.k • Packed column air stripping s Aboveground biotreatment AO Cjt3>V1!bpd tit�qod! aneao6,of educidg the dissolved hydr&arbons In discharge water from I n the ground water recovery system to nondetectable limits,and will be used to treat ground water prior to i ,r discharge to the sewer. s, F t ; fe Packed column air stripping is another effective means of stripping volatile organics from the ground water discharge. These units require high maintenance,have a irridcncy to clog,and sire vol economical for the small reduction In hydrocarbon cancenlratlons necessary at the site to meet the discharge requirements, j t = costly and would not be practical at this site. Aboveground biological treatment of groundwater is relattvcly S kx