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SEP 17 '99 04:46PM ESCNCf'Y`MONTt' '� P.5/10 <br /> Irl, <br /> Earth Systems Consultants <br /> Northern California 47853 warm Sprigs Blvd. <br /> Fremont,CA 94539-7400 <br /> (510)353-0320 <br /> FAX(510)353-0344 <br /> File No. NFS-4463-02 <br /> March 23, 1999 <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, CA 95203 <br /> Attention: Ms. Linda Turkatt <br /> Subject: Commercial Property (14.57 acres) <br /> 1881 Rustan Road <br /> Tracy,California <br /> WORKPLAN FOR GEOTECHNICAL SOIL .EVALUATION <br /> INCLUDING PERCOLATION TESTING <br /> FOR PROPOSED RETENTION PONDS. <br /> Dear tiU.Turkatt _ <br /> On behalf of Ridgeway MacKenzie Partners, Earth Systems Consultants Northern California <br /> (ESCNC) is submitting this workplan to provide an geotechnical soil evaluation for the 14.57 acre <br /> parcels located at 1881 Rustan Road,Tracy, California. (See attached Figure 1). <br /> The scope of work will include: subsurface exploration and identification of the subsurface soil and <br /> groundwater conditions by means of drilling twenty-one exploratory borings at the site %pith truck- <br /> mounted drilling equipment_ Location of the proposed borings is shown on the enclosed Figures <br /> and 3. Exploratory drilling operations would be conducted by a staff geologist or soil engineer <br /> from our firm. One of the borings will be drilled to a depth of 45 feet to evaluate the liquefaction <br /> potential at the site. The subsurface profile would be logged and relatively undisturbed soil <br /> samples collected at appropriate depths. We anticipate that the exploratory drilling operations will <br /> be completed in three days. The borings will be backfilled with a concrete slurry grout from total <br /> depth to surface. <br /> Additionally, two percolation tests will be performed on borings sited at the location of the two <br /> proposed storm water retention ponds. The borings are anticipated to be drilled to five feet deep, <br /> the proposed depth of the ponds_ <br />