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FLiNVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit$IlreYLFSOI'S <br /> .a Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman R.E.H.S. <br /> N. Director Mike Huggins,R.E.H.S.,R.D.I. <br /> LiJ.i''i <br /> Al Olsen,R.E.H.S. Stockton; California 9.5202-2708 Douglas W.Wilson,R.E.H.S. <br /> . .?' <br /> • c.. �P P,-ogram MnII�Igej' Telephone: (209) 468-3420 Margaret Lagor;o;R.E.H.S. <br /> g t i F o Rc� p Robert MCClellon,R.E.H.S. <br /> Laurie A.corona,R.E.H.S. Fax: (209),464-01.38 <br /> Program Manager Mark Barcellos R.E.H.S. <br /> KAREN PETRYNA <br /> SHELL OIL PRODUCTS <br /> PO BOX 7869 <br /> BURBANK CA 91510-7869 <br /> RE: WATERLOO SHELL SITE CODE: 1,760 <br /> 4315 WATERLOO ROAD <br /> STOCK TON CA 95205 <br /> WORKPLAN: Site Investigation Work Work Plan DATED:. September 17. 2004 <br /> PREPARED BY: Cambria Environmental Technology Inc (Cambria) <br /> APPROVED with Conditions (See Below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF.THE WORKPLAN (H&S <br /> 25296.10,subd.(c)(3): <br /> • Install two 4-inch diameter Schedule 40 PVC monitoring wells M`W-5 and MW-6 <br /> with 15-foot screen intervals to approximately 10 feet below groundwater table. <br /> • Install MW-7 with a 10-foot screen interval to approximately- 83 feet to 93 feet below <br /> surface grade (bsg) to evaluate the vertical extent of the contamination in <br /> groundwater. Mud rotary drilling may be employed instead of hollow stem auger if <br /> necessary. <br /> • Collect soil samples from borings every 5 feet for soil description and field screening <br /> using a photo-ionization detector (PID). <br /> • Soil samples may be selected for laboratory analyses. Chemicals to be analyzed <br /> include Total petroleum hydrocarbons as gasoline (TPH-g), aromatic hydrocarbon <br /> compounds (BTEX�, fuel oxygenates, and lead scavengers by EPA Method 8260B. <br /> COMMENTS AND CONDITIONS: . <br /> In the work plan Cambria objected to EHD's directive to restart quarterly sampling of the 5 <br /> oxygenates in all monitoring wells as stated in a letter dated August 26,2004. Cambria <br /> recommended revising the schedule to sampling MW-1 through 1\1W-4 quarterly for TPH-g, <br /> BTEZ, and Methyl Tert Butyl Ether (MTBE), and annually include analysis of the remaining <br /> 4 oxygenates: tert-amyl methyl ether(TAME), tertiary butanol(TBA), tertiary butyl ether, <br /> and di-isopropyl ether. EHD has the following response to the proposal: <br /> MTBE and TBA have been continuously detected in MW-1 for 5 consecutive quarters <br /> between April 2003 and April 2004,with the concentration of TBA as high as 340 <br /> micrograms per liter (ug/1) in April 2004. TPH-g has been detected the last 4 quarters <br />