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f nw, <br /> F;,:-,��•Ci n.l;se;:o A"-.oc if,7F5 h`:(. <br /> ENVIRONMENTAL SITE EVALUATION <br /> LATHROP PROPERTY <br /> WKA No. 1184.02 <br /> September 21, 1990 <br /> Page 5 <br /> �s6 <br /> �JI <br /> I a <br /> southerly property boundary,along Thomsen Road.Vertically, hydrocarbon contaminated Solis <br /> ra appear to extend to a depth of approximately 15 feet below existing grade. <br /> RECOMMENDATIONS <br /> Subsequent to approval of a workplan by the regulatory agencies, we recommend that <br /> contaminated soils be excavated to a depth equal to the localized ground water level. <br /> Contaminated sobs should be properly stockpiled onsite for remediation subsequent to regulatory <br /> agency approval. The excavation should then be backfilled with clean soil. y <br /> ,.n p p , <br /> Given the preliminary indication that groundwater has been impacted beneath this ra a we <br /> would further recommend that ground water monitoring wells be constructed on the property. <br /> Ground water quality data, obtained via laboratory analysis of water samples from the wells, <br /> would enable us to determine the concentration and preliminary extent of ground water <br /> Lm, contaminants. In addition, ground water depth measurements taken from the wells would allow <br /> us to determine the net hydraulic gradient of ground water beneath the property. These data <br /> would allow us to provide recommendations for ground water remediation, if necessary. <br /> f.... !_IMITATIONS <br /> The above conclusions are based on our assessment of conditions indicated to exist as of the <br /> t i date of our field reconnaissance, August 22, 1990. The results of this Investigation do not <br /> preclude the possibility of substances that are currently or in the suture defined as hazardous <br /> being present on the property because of activities we did not identify. This report is applicable <br /> i only to the investigated portion of the property and should not be used for any other area of the <br /> L,. propel' <br /> I <br /> L.. <br /> Wallace - Kuhl &Associates, Inc. <br /> GeO <br /> ANTH iNY �[1 <br /> SARAC'NO <br /> N <br /> CERTIFIED David Von Aspern <br /> Anthony Saraci =• ENGINEERING <br /> Senior Ge gist P�., <br /> GEOLOGIST•;'�?� Staff Geologist <br /> ..�' l '• ... ..•• pF �' <br /> + DVA:AS:sdm <br />