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RAMAGE <br /> ENVIRONMENTAL Sacramento Office <br /> Post Office Box 869 <br /> Rancho Murieta, CA 95683 <br /> Tel (916) 354-3250 <br /> April 21, 1999 fax (916) 354-1786 <br /> X0 . <br /> Mr Jeffrey Wong, R E H S <br /> San Joaquin County PHS/EHD � <br /> r � �' <br /> 3304 East Weber Avenue, Third FloorO+�}+u,r Y F <br /> Post Office Box 388 ' I I- t ,,_ <br /> Stockton, CA 95201-0388 <br /> Re Soil and Soil Stockpile Sample Results, Canopy Support Over-Excavation <br /> RINO Service Station, 1001 E Yosemite Avenue, Manteca, Site Code 18761 <br /> Dear Mr Wong <br /> On behalf of Rinehart Oil, inc , Ramage Environmental is pleased to submit to the San <br /> S <br /> Joaquin County PHSIEHD the enclosed soil and soil stockpile sample results, related to the <br /> canopy support over-excavation at the above-referenced site Attachments include two <br /> scaled site maps indicating sample locations, tables summarizing cumulative soil and soil <br /> stockpile sample results, and the laboratory reports <br /> On April 1, 1999, under your observation, Fisch Environmental excavated approximately 100 ` <br /> cubic yards of soil from the vicinity of the former eastern canopy support structure and 100 <br /> cubic yards from the vicinity of the former western canopy support structure During the <br /> excavation, soils were field screened for organic vapors with a phototonization detector <br /> Each of the excavations ultimately measured approximately 12 feet by 12 feet by 14 feet <br /> deep Loose soil conditions and the caving of the excavation side walls expanded the upper <br /> dimensions of the excavations and limited the depths of excavation The excavated soil was <br /> stockpiled on asphalt pavement and plastic sheeting on the west side of the service station ° <br /> building <br /> Ramage Environmental collected two soil samples from each of the excavations All four <br /> soil samples were collected from the backhoe bucket by driving two-inch diameter by six- <br /> inch long brass sample sleeves into the soil with a rubber mallet The two soil samples <br /> collected from the eastern excavation (E-E-14 and E-W-13) were taken from a cemented <br /> clayey silt interval encountered at approximately 13 to 14 feet below ground surface (bgs) <br /> One of the soil samples collected from the western excavation (W-C-13) was also taken from <br /> this cemented clayey silt The second soil sample collected from the western excavation(W- <br /> W-9) was taken from the overlying, loose, poorly-graded fine-medium sand The caving <br /> sands limited deeper excavation and soil sampling on the west side of the western <br /> excavation <br />