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. -' KLEiNr- ELOL t • Within '/< mile there are two sites with listed environmental conditions that have caused contamination to their soil or groundwater. 1. 1325 N. Corral Hollow Road, Cintra Group Properties — listed as being a SLIC site contaminated with TPH. The site is currently in the Remedial Investigation phase of work. 2. 1325 N. Corral Hollow Road,Tri Star Properties—listed as having a release of gasoline from an underground storage tank(LUST)in 1997;leak is being confirmed by County. • Within '/4 to '/2 mile there are 10 other LUST and SLIC sites. Conclusions • The two sites at 1325 N. Corral Hollow Road are downgradient of this property, therefore the contamination caused by the LUST or the SLIC should not pose a threat to this Property. • Since the other sites with contamination are nearly %, mile away from the subjects Property, there is no evidence showing that they pose an environmental concern for this Property. Recommendations • If further information is desired regarding whether these sites have any liability to the Property follow-up with SJCDHS should be done to review files that the county may have. This can take from six weeks to six months since San Joaquin County Department of Health Services takes weeks to get files pulled to review. Additional information relative to Kleinfelder's workplan contained in the Geologic Technics report indicate that groundwater is about 10 feet below ground surface. Groundwater flow direction based on two groundwater sounding events conducted in February and March 1990 indicated a groundwater flow direction towards the west northwest and towards the northeast, respectively. Current Background Data During grading operations for upcoming residential at the site Teichert Construction observed stained soils with a petroleum-type odor during the week of June 18, 2001. Fitzpatrick Homes contacted Kleinfelder to assess this concern. As a result soil has been removed from two excavations and stockpiled at the site. Confirmation soil sampling has been conducted from both excavations. Soil is still being removed from a second larger excavation and it appears that discolored and odiferous soils extend to groundwater. The data thus obtained from these two excavations is still preliminary. However Fitzpatrick Homes has requested that a concurrent groundwater assessment be conducted related to the a second larger excavation. The following is a brief summary of current background data related to these two excavations. Approximately 75 yards of contaminated soil was removed from a relatively small excavation one June 20, 2001. This excavation measured approximately 14 by 28 by 5 feet deep. This excavation is located near the western property boundary behind the former maintenance shop building of the former R&B Trucking facility. Soil sampling has been conducted within this and along the sidewalls of this excavation. Based on the preliminary analytical results of the soil sampling conducted it appears most of the contaminated soil was removed and that groundwater was probably not impacted from the soil excavated in this area. 20-YPI-628/201 I Pi 80 Page A-5 0 2001,Kleinfelder,Inc. July 2,2001