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a�. I <br /> 1 <br /> F <br /> ° <br /> 4491 Wast DuiU a Ferry Road,Tracy.California <br /> D4LA ProJoct No.40.91-732 <br /> Page 3 <br /> . 2.2 Slte 8t�r3cvrr, rse1 <br /> ?1&*49 Rule;A"Sad the property from Mr. Eugene Rcitt In May136. r <br /> .n February 1988, Petro <br /> Cbwk rersovod two 1,400 gallon Undersmund stor8se tanb which had contained icaded and unleaded <br /> 'p gIine. Chemical analysis of sail samples collected fromthe tank excavation indicated that <br /> further <br /> Investigation was required. <br /> Oft?tiny 271.1988, ttwai r <br /> tater well Mw. Waa Installed wr&of thenlc location by Water Works. A <br /> ground water sample eras collected on June 13, 1QE8, &ora.ntaGitsing well MW-1 and aualyzet3 for <br /> petroleum constituents. The reawts of tits cltadcal analysis, cgxentratlona of 1.6, 1b.5, a� <br /> Wb)for benzt:�sa,jilt rti�c,and ] Ieurrt h <br /> S L.K !Y'l�. w 1'. ...NiwY pe" - <br /> !" ydrocar5ons, respet tively. Further <br /> investigation was requested by the County of San Joaquin in a letter dated June 11, 1991. <br /> r. On July 26, 1991,Delta submitted a Phase I <br /> hFydrogeologtc Investigation Work Plan to Ms.Eleanor Ratliff <br /> Hof the County of San Joaquin(the County)to characterize the presence of petroleum hydrocarbons at the site. <br /> i A regional map showing the ground water elevation contours for the unconfined aquifer for spring 1989, <br /> Proper by the San Joaquin County Flood Control and Water Conservation District,shows the directi0 <br /> Sp <br /> of ground water flow le towards the meth or northeast. Depth to ground water is expected to be <br /> approximately 15 to 20 f6"below the ground surface. <br /> r <br /> ,-. �.1 Site Sells n��Sr.ffi� <br /> Aum 28;1991 -two soil <br /> ,._ . _ . . . borings.were drilled on site to depths of 25feet below jj�ground surface and <br /> -� <br /> wefa�oatqPleled as tprlag'wills (W-2.' <br /> abd:MW4;'atonitnain,8:::well MW-1 had previously been <br /> installed). 'The monitoring well locations are shown in]Figure 2,and the soil boring logs are presented is <br /> h, Appendix A. Generally, the lithology was zomprised of dark to light brown silty clay and sandy silt with <br /> y. medium to fine grained sand lenses. The sand lenses were approximately 2 feet thick at a depth of <br /> approximately 3 feet. Sampling Procedures are presented in Appendix B. <br /> , A <br /> A. { <br /> i s . PHIOOI.BP <br />