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EL : Dec 16 ,93 16:44 No .027 P .01 25tinyq DEC 16 1993 Date: December 18 1993 Number of Paces (inctudlng cover page) kI SER Jet)No. D7549-001-141.05 Massage To Name; Ed Padilla Telecotty nurnber caned (2M464-013a ARM: San Joaquin Courtly- Public Health Services C1W Stockton State: CA R you do not receive all of the pages, please cad 091-(916)•93g-4100 as soot as possible. From Name: Mark Urquhart _Department Autoauendant No. 91Pr93>}ai39 Ext. 243 One of the items were discussed in our meeting on September 9, 1993 regarding design for the renovation 0 the Lovelace Road Transfer Station was greaseloil traps for storm drainage. There are four discharge points to the retention pond (See RSI-7). Three (DI's 16, 24, and 22) have peak flows of 13.7, 3.22 and e,0 respectively. The fourth (DI-26) has only.63 c(a (from 2 Inlets only). As we discussed by telephone, I obtained information from P&L concrete regarding their typical saW and grease trap (attachad). As with dither typical grease traps, they are a modified septic tank with 4 inch linea In view of the large pipe sizes and flows at Lovelme, use of this type of a separator may not be practicat. The flows at Lovelace are too large to fustetial with that type of unit (12. 24 and 30 inch lines). If these are Installed on 24 and 30 Inch lines it may Misty result in the system backing up such that the inlets would hood The typical grease traps appear to be designed more for lower flows associated with commercial kitchen waste or other lower flows. I have attached two details of grease trips that we have installed for storm water Inlets on other jobs They typically could be Installed in a round (6' die may be needed) manhole to ktckrde an outlet pipe tftat Is homed down 4 to 6 vxhas below the level of the kdet A bailie plate cotilld be installed for units which also function as an inlet A oustom¢ed intetMnanhele similar to these could be Wwm ted on each branch at key locations to serve as a separator (DI's 16, 22, 24 and 26). These would include a unit on each branch at inlets just prior to pond discharge. The retention pond could also be routinely cleaned to remove sill. Note also that the truck wash and transfer tunnel will have dedicated tradi Tonal greas81gr3 separatM. The transfer tunnel will have a separator installed upstraem of a lift pump which would discharge to a ttoldktg tank The truck wash separator will be pan of a recirculating wash water system I have discussed this with Gabriel Karam. Please contact Ire to discuss this so we can finalize plants. Thanks. cc: Gabriel Karam. S.J. County, Pubic Works cl kVnjulRsk eat