SU0005198 SSNL - Laserfiche WebLink

Home Browse Search

09/07/2001 18:36 GB42627 OBRIENICI..AYBAR PAGE 09 PRE J SENT AND PAST U5E OF THE SEU Kleinfelder has performed a Limited Phase I Environmental Site Assessment (ESA) for the Cherry Glen Subdivision property (File No. 43-4476-OLEGI). The purpose of the assessment was to assist the client in recognizing environmental conditions at the site. Througb literature review, aerial photograph review and interviews, the assessment concluded that in the early 1900's the site was used for Branching and a structure with cattle pins was constructed near the northeast comer of the site. Also, railroad tracks crossed the southeast corner of the site and continued along the east boundary. Between 1937 and 1952, a pear orchard was plawod in the western portion of the site. By 1963 the orchard has been removed and the site has been used for ranching till the present time. By 1975 the structure had been removed and in the early 199Ws the railroad tracks were removed_ According to a previous land owner, a septic system has never been located on-site. During our site reconnaissance, a concrete grad with steel well casing was noted in the northeast portion of the site, approximately 220 feet west of Fine Road and 50 feet j south of the property boundary. HISTORICAL GROUNDWATER DE In accordance with groundwater reports publisbed by the San Joaquin County Flood Control and Water Conservation District (Spring 1990 to Spring 1498), high groundwater in the project area has been recorded at depths in the range of about 124 below ground surface. At the time of our ' study,the depth to water in the well located near the northeast corner of the site was meamured at about 1311 feet., i FIEL ,EXELUII.ATIONS AND TESTINIG The subsurface conditions at the site were explored as part of a geoteubuical investigation on July 28, 2999 by drilling three borings (B-1 through B-3) to depths ranging fi+om about 15.5 to 16.5 Feet below existing grade. The borings were drilled using a Sirnca 2400 truck-mounted drill rig equipped with 4-inch Q.D. solid-stern auger. During the same time period, a percolation + boring was drilled in the backs central portion of each of the 14 lots(P-1 through F-14)-at depths ranging fr m about 5 to 20 feet below site grade. Once the percolation tests were performed, Baring B-2 was converted to a percolation tests because of failing test results at Petoolation P-9. 1 August 23 2 040 0 was drilled at both Lots 2 and 14 P-15 and P-16 for additional On A. gu one boring ( ) percolation testing because ofpmvious failing tests. The approximate boring and percolation test locations are presented on the attached plate_ to very stiff, Based on our findings, the subsurface soils encountered consisted Predominately of ry , moderately plastic sandy clays to depths ranging from approximately 2 to 3.5 feet. The clays were underlain predominately by hard silts, hard clays and discontinuous and interbedded comparatively thin strata of medium dense to dense silty and clayey sands to the depths explored- 20-4476-01.G}2nOOOP,923 Seplember 14.2000 ` 4)2000 KleinfMtr,Inc Page 2 of 5