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Ortnderson Constructors, Inc. <br /> M3070 Bay vista ct_, W e C <br /> /fY a. . ` `y� 2 ' Benkfa, CA 94510 <br /> .` I � (7 , - Telt 707.752.8000 <br /> ACGIONc n� ; 7ru✓'d7 % " ,� 1 Fae: 707.7528001- <br /> , nww b , n t rao�ln <br /> October 23, 2019 •;`- � t �. �;� � C�i <br /> Attention, Environmental Health Department San Joaquin County_ <br /> Subject: Shelf Oil Products UST TK 5 IDU 0121005 Closure in Place <br /> Dear San Joaquin County, <br /> ;9 :opc of Work <br /> aInstall new contact water sump T-25 , contact water transfer pumps P-103and P-104 <br /> near the existing UG-5 tank as shown on drawings. <br /> 0 Remove P48A Discharge piping up to tie in point TP-01 . Drain piping up to tie in points <br /> TP=02 -atrd tie in poirA TP=03 as shown on drawings- P-050 and P=051 . <br /> © Install new discharge and drain piping spools perdrawings P- 100 and P- 1.01. <br /> 0 Hydro_test.all.new_piping. . <br /> 0 Abandon existing contact water tank UG -5 in place. <br /> 0 Tie in subgrade 4"drain line from loading rack to new sump. <br /> 0 Triple clean tank <br /> Have-marirrevhumist-verifytank is clean: <br /> ® Fill tank with flowable fill slurry (low strength lean Concrete) <br /> Basis for Closure in Plaace <br /> ® Existing subgrade drain line and above ground piping is the driver for the location of <br /> new sump. This puts the new sump within feet of the existing UG-5 UST, Removal of the <br /> existing tank will compromise the Base for the new sump . <br /> ® <br /> Data collected-fromth-emonitoring wells-showsthe' watertableclose-to11' , Removal <br /> of the tank may require dewatering witch will generate water waste that will need to he <br /> collected and disposed of. <br /> Confidential <br />