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APR 16 195 11:23PM FUGRO WEST ROSEVILLE P.dl` <br /> GRO <br /> FUGRO WEST, INC. <br /> 1D50 Moto*lana.Sufis 160 <br /> April 17, 1995 AosaWfa,Califorria 95678 <br /> Fugro Project No. 94-47-8620 roe (916)782-2110 <br /> FAX! (918)786-7830 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> Post Office Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Emission Control During Underground Storage Tank (UST) Removal. <br /> Shell Service Station (WIC No. 204-7524-3505) <br /> 2575 Country Club Boulevard, Stockton, California <br /> SJCPHSIEHD Site Code. 1223 <br /> Dear Ms. Meays: <br /> Fugro West, Inc, (Fugro), on behalf of Shell Oil Products Company, is providing this <br /> letter proposing a protocol for vapor monitoring during the removal of UST. This letter has been <br /> submitted in response to a telephone conversation with San Joaquin County Public Health <br /> Services,Environmental Health Division (SJCPHS/EHD)on March 22, 1995. The SJCPHSlEHD <br /> asks that we clarify "engineering controls", as proposed in the March 8, 1995 addendum to the <br /> original "Soil Management Plan" (February 8, 1995), and establish action levels for <br /> implementation. <br /> During excavation, Fugro will monitor the air quality using a photoionization detector <br /> (PTD) calibrated to 100 parts per million, volume (ppm v) isobutylene. Monitoring will be <br /> performed in the breathing zone at the downwind property boundary approximately every 30 <br /> minutes, or more frequently as conditions demand- Readings will be recorded on the attached <br /> form and submitted with status reports to the SJCPHS/END. Three action levels are proposed: <br /> PID READING (ppm v) ACTION <br /> 0-100 No action necessary. <br /> 100-300 Mist application of water as an emission suppressant. <br /> Shutdown of excavation operation. <br /> >300 Collect a one liter tedlar bag sample for analysis. <br /> Line excavation with plastic sheeting. <br /> When PID readings exceed 100 ppm v, misting of the soil and excavation will occur. <br /> Mist application of water to the soil and excavation will retard the volatilization of organic <br /> compounds into the atmosphere and act as a dust prevention measure- The application will be <br /> done with a mister attached to a hose. The mist will be evenly applied along the sides and base <br /> of the excavation. The mist will only be applied to dampen the surface, not saturate the soil- <br /> 94478620.ELT A member of the Fugro group of cumpanlas with oNlcas throughout me wort <br />