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R k/q� <br /> A GROUND WATER CONSULTANCv s 9tllll F' s <br /> Mr. Muniappa Naidu May 31, 2007 <br /> Senior Registered Environmental Health Specialist <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, CA 95202-2708 <br /> RE: Report on Sampling at Bottom of Overexcavation of Tank Removal Pit— South of <br /> Joe's Travel Plaza,Northeast Comer Intersection Harlan Road and Thomsen <br /> Street, Lathrop, California. <br /> Dear Mr.Naidu; <br /> This letter transmits the results of soil and groundwater samples collected May 18,2007 <br /> under the observation of Ms. Margaret Laagorio from the bottom of the overexcavation <br /> pit at the removal site of two guesstimated 500 gallon single wall steel tanks at South of <br /> Joe's Travel Plaza,at the northeast corner of the intersection Harlan Road and Thomsen <br /> Street in Lathrop,California.This letter is submitted on behalf of Watton Engineering, <br /> Inc. <br /> First encountered groundwater was exposed at a depth of between 11 and 11.5 feet below <br /> the adjacent ground surface.A grab sample of the water ponded in a shallow hole at the <br /> northwest comer of the excavation was collected by pumping it to the surface with a <br /> peristaltic pump.A soil sample was collected from the sidewall of this deeper area <br /> immediately adjacent to the shallow hole from which the groundwater sample was <br /> retrieved. <br /> A copy of the laboratory analytical report and chain-of-custody documentation are <br /> attached. The laboratory analytical results are summarized in attached Table 1. <br /> Please do not hesitate to email h2ogeolAcomcast.net or call the undersigned at 925-373- <br /> 9211 should you have any questions. <br /> ���oNat cF <br /> Sincerely, <br /> i!� o <br /> Gar <br /> a a <br /> * rn p <br /> GtoCci;icr <br /> 4GaryD. ,P.G. (3768),C.E.G. (1559), C.HG. (127) TFO�. r '` <br /> Principal,Hydmgeologist <br /> H2OGEOL A GroundWater Consultancy <br /> Xc: <br /> Mr. Richard Walton, Walton Engineering,Inc.,P.O. Box 1025, 3900 Commerce <br /> Drive, West Sacramento, CA 95691 <br /> P.O.Box 2165 0 Livermore,California 94551-2165 0 (925)373-9211 <br />