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u <br />Case Closure Summary Page 2 <br />Leaking Underground Fuel Storage Tank Program <br />III Release and Site Characterization Information (continued) <br />Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br />Contaminant <br />Soil <br />(ppm) <br />Water <br />(ppm) <br />Contaminant <br />Soil <br />(ppm) <br />Water <br />(ppm) <br />Before <br />After <br />Before <br />After <br />Before <br />After <br />Before <br />After <br />TPH (Gas) <br /><1 <br /><1 <br />UNK <br />UNK <br />Xylene <br /><.005 <br /><.005 <br />UNK <br />UNK <br />TPH (Diesel) <br />817 <br />4.8 <br />UNK <br />UNK <br />Ethylbenzene <br /><.005 <br /><.005 <br />UNK <br />UNK <br />Benzene <br /><.005 <br /><.005 <br />UNK <br />UNK <br />Oil & Grease <br /><25 <br /><25 <br />UNK <br />UNK <br />Toluene <br /><.005 <br /><.005 <br />UNK <br />UNK <br />Heavy Metals <br />NA <br />NA <br />UNK <br />UNK <br />MTBE <br />.34 <br /><.005 <br />UNK <br />UNK <br />Comments: DIESEL CONTAMINATION WAS LIMITED AND MTBE WAS NOT CONFIRMED WITH ADDITIONAL SOIL <br />BORINGS. POSTAL FACILITY IS ON PUBLIC WATER AND CITY OF STOCKTON WELL SSS -1, LOCATED AT 4728 <br />QANTAS LANE, IS WITHIN 1000 FEET OF THE SITE. <br />IV. Closure <br />Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? YES <br />Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? YES <br />Does corrective action protect public health for current land use? YES <br />Site management requirements: <br />Should corrective action be reviewed if land use changes? NO <br />Monitoring/Vapor wells decommissioned: Number Decommissioned: Number retained: <br />List enforcement actions taken: LEVEL 1 <br />List enforcement actions rescinded: <br />V. Local Agency Representative Data <br />Name: Margaret Lagorio <br />Title: Supervising REHSISite Mitigation/LOP Unit 1V <br />Signature: <br />Date: ::� 1�Ll 1 rj b <br />VI. Central Valley Regional Water Quality Control Board (RB) Notification <br />Date Submitted to RB: <br />Response Date: <br />RB Staff: M. HARTZELL <br />Title: Assoc Eng Geologist <br />Response: <br />V11. Additional Comments, Data, etc. <br />SOIL ONLY; DIESEL LOCALIZED, MTBE NOT CONFIRMED <br />This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br />site file. <br />