|
�utlittu
<br /> FUGRO WES :. ; 3 Pit 1.33 �(
<br /> 1050 FAaiody Lane,Suite 160
<br /> Ro5evlile,Cnlllornfa 95678
<br /> Tel.(916)782-2110
<br /> August 15, 1994 rax:(916)786-7870
<br /> Mr. Michael Infurna
<br /> San Joaquin County Public Health Services RECEIVED
<br /> Environmental Health Division
<br /> 445 N. San Joaquin Street
<br /> P.O. Box 388 ■U B 1 8 1994
<br /> Stockton, California 95201-0388 H
<br /> Subject: Former Exxon Service Station(RAS No.7-0137) ENVIRONMENTAL HEALTH
<br /> 1605 South EI Dorado Street, Stockton, California PERMIT/SERVICES
<br /> Dear Mr. Infurna:
<br /> On behalf of Exxon Company USA(Exxon), Fugro West Inc.(Fugro)proposes revising
<br /> the November 11, 1993, Remedial Action Plan for this site, Before installing a full-scale
<br /> treatment system, Fugro recommends using insitu bio-remediation and assessing its
<br /> performance. The proposed system includes bio-venting and groundwater oxygenation
<br /> (GO).
<br /> Bio-venting, or low-flow vapor extraction, increases oxygen levels in soil which can
<br /> stimulate, or increase, the rate of naturally occurring bio-degradation of petroleum
<br /> hydrocarbons, The system will consist of a small vacuum blower controlled by a timer,
<br /> connected to wells MW-1, MW-2 MW-3, MW-5, VEW-1, and VEW-2. The timer on the
<br /> vacuum blower will be used to limit emissions to 2 pounds per day of total petroleum
<br /> hydrocarbons (TPH). San Joaquin Valley Unified Air Pollution Control District
<br /> (SJVUAPCD)does not require air abatement or permitting for systems that emit less than
<br /> 2 pounds of TPH per day.
<br /> The GO system will increase dissolved oxygen(DO)concentrations in the groundwater
<br /> which can stimulate, or increase, the rate of naturally occurring bio-degradation. GO
<br /> involves supplying air at very low flowrates to a diffuser submerged in the groundwater.
<br /> The diffuser consists of a porous material which forms small air bubbles which will rise
<br /> through the groundwater,transferring oxygen. Generating small air bubbles maximizes
<br /> the transfer of oxygen, at very low flow rates, and limits disturbance of the static
<br /> groundwater level, The GO system will consist of a small compressor,pressure regulator,
<br /> flow meters, flow control valves, pressure gauges, timer, and down well fine bubble
<br /> diffusers. The anticipated flow rate for the GO system is estimated to be less than 0.05
<br /> cubic feet per minute (CFM) per well and less than 0.1 CFM total. The wells to be
<br /> connected to the GO system are MW-1, MW-2, MW-3, and MW-5.
<br /> eWXI'nr U.S.op—ling comparwas In CnIft-in.L—kinnn,M4ssouri,nod Tnxnr.
<br /> Inlornnfional opnrnlinp cnnrpnnias iu Auslralin,rinl9inm.0,-,i,,i,Cannrin,Gnrnrnny,lion KnnO I, fo ..8yr COUNTY
<br /> Malaysia,The Netherland,.Saudi Arabin.Sin9npore.United Kinpdem,end Uihw" +lU`{ COUNTY
<br /> PUOLIC HEALTH SERVICES
<br /> ENVIRONMENTAL HEALTH DIVISION
<br /> P. 0. BOX 2009, STOCKTON,CA 95021
<br /> PHONE: (209)4W-3420
<br /> ❑ Approved
<br /> eg Approved with changes: See Re,narks
<br /> ❑ Disapproved; See Reit-,arks
<br /> Remark
<br /> Date a BY
<br /> Approval of these plans extends only to that
<br /> which is shown and .described hw,-on but
<br /> does not authorize or approve any omission
<br /> or deviation of. requirements of State laws c►r
<br /> 4oCalOrdinances. S./. ✓�.� ��
<br />
|