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MacKinnon Environm6ttal Consulting <br /> Specializing in Ground Water and Soil Contamination 2834 San Antonio Drive <br /> \X7alnut Creek, California 94598 <br /> (415)930-9272 <br /> March 30, 1990 <br /> Mr . Manny Vierra <br /> MSV Construction Co. <br /> 1009 Villa Maria Court <br /> San Jose, CA 95125 <br /> Dear Mr . Vierra: <br /> SUBJECT: PROPOSAL TO COLLECT AND ANALYZE 8-10 SOIL SAMPLES <br /> PROPOSAL NO. 490STK <br /> We are pleased to submit this proposal for a site assessment for <br /> the property at the corner of Waterloo and Harding Streets in <br /> Stockton, California. This proposal outlines the scope of work, <br /> timetable, cost estimates for drilling, soil sampling/analyses and <br /> report preparation. <br /> BACKGROUND <br /> We understand that the site is approximately 3 acres in size and <br /> used to have one or two underground diesel storage tanks. The <br /> location of the old tanks is known and will be supplied to us. <br /> Information supplied to us by San Joaquin (SJ) County suggests <br /> that the ground water in this area is between 6 and 60 feet below <br /> ground level . <br /> SCOPE OF WORK <br /> The objective of the work will be to collect 8 to 10 soil samples <br /> and analyze these samples for the presence of diesel fuel . <br /> - The soil samples will be taken at the following locations : <br /> 1 . A soil sample will be collected from one end of each tank pit <br /> in the native soil - if discernable - below the tank backfill <br /> material . <br /> 2. A soil sample will be taken immediately downgradient of each <br /> tank location if it is possible to assess the direction of ground <br /> water flow. The driller will advance the augers in a test hole to <br /> 15 feet below grade or to the water table, whichever comes first. <br /> A sample will be taken at the capillary fringe just above the <br /> water table, providing that water table is no deeper than 15 feet <br /> below ground surface. This sample depth may indicate whether <br /> ground water might be impacted . <br /> If there are no clear indications of the ground water flow <br /> direction or if water is deeper than 15 feet, then a second sample <br /> will be collected at the opposite end of the tank pit (s) from the <br /> first sample (s) . <br />