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• Project No. 034-17016 Site-Specific Health& Safety Plan Page No. 5 north of the maintenance shop in an area utilized for floor scrubber cleaning operations and for occasional equipment cleaning operations. Surface staining and minor pitting which appeared to have been accumulated over an extended period of time were observed on the building foundation within the battery charging/storage area and proximate to that trench drain. An access port associated with a subsurface sump was observed at the southern end of the battery charging/storage area. Mr.Sommerfeld stated that the sump contains crushed limestone and that any acidic rinse water or battery acid entering the adjacent trench drain passes through the crushed limestone sump and is neutralized prior to entry into the municipal sewer system. The floor scrubber/equipment cleaning area appeared to be well used with moderate surface staining observed within this area and a dark liquid present in the base of the drain. Mr.Sommerfeld stated that this floor scrubber and equipment cleaning area drain/sump currently discharges to an adjacent subsurface clarifier which was installed as further protection for the municipal sewer system approximately 3-5 years ago. Mr.Sommerfeld stated that all of the subsurface sumps, clarifiers, and oil/water separators located on the subject site are pumped out and serviced on a regular basis by a contractor,and that all such features located on the subject site are connected to and discharge to the municipal sewer system. Housekeeping conditions were observed to be good within the on-site buildings and throughout the subject site. No evidence of the intentional disposal of hazardous materials or hazardous waste into the on-site floor and trench drains was observed during Krazan's site reconnaissance, and no obvious evidence of environmental non-compliance issues of any sort was encountered during the course of this assessment. However, given the use of the on-site floor/trench drains for cleaning operations (floors, vehicles,trucks), including former steam cleaning operations at the truck maintenance shop, and the immediately proximate use/storage of hazardous materials and hazardous wastes, it is possible that petroleum hydrocarbons, acids, and possibly waste solvents from parts cleaning operations have entered the referenced floor/trench drains,the related clarifiers and/or oil/water separators, and the associated subsurface plumbing connections over an extended period of time. Consequently,given the approximately 26-year age of the on-site warehouse and truck maintenance shop buildings(the truck wash bay facility is approximately 10 years old),the apparent introduction of battery acid into the subsurface trench drain in the warehouse building,the proximate use of acids, petrochemicals, and possibly solvents for an extended period of time, and the absence of any information documenting the structural integrity of the drains,clarifiers,separators,and associated plumbing connections, the condition of the subsurface of the subject site in the vicinity of the above-referenced drain/clarifier/separator features and associated plumbing connections is unknown For a higher level of due diligence relative to potential subsurface impacts associated with the referenced drain/clarifier/separatorfeatures and the associatedplumbing connections,Krazan recommendedconducing a limited subsurface assessment to assess the presence or absence of significant concentrations of the constituents ofconcern. Stormwater Management System Retention Basins During Krazan's site reconnaissance, the subject site was observed to contain a stormwater management system,including selectively graded surfaces,stormwater drain inlets with associated transfer piping/gutters, and stormwater retention basins. A major artery of the stormwater drainage system is an east-west trending stormwater drain channel observed in the central portion of the subject site. This feature appears to discharge as a shallow valley gutter into an on-site stormwater retention basin in the central-eastern portion of the subject site. Mr.Sommerfeld stated that the system is designed such that all stormwater runoff is retained on the subject site and no stormwater is discharged from the subject site. Unpaved,vegetation-covered areas of significant size (25+ acres) were observed in the eastern portion of the subject site which are utilized as stormwater retention basins, and narrower stormwater retention basins have been constructed around the northern, southern, and western perimeter of the subject site. Mr. Sommerfeld indicated that heavy recent rainfall had necessitated installation of a rough shallow channel in the basin to route stormwater from the above-referenced valley gutter discharge point in a northerly direction to avoid flooding adjacent paved areas. No odors, significant soil staining, or stressed vegetation were noted at the referenced discharge point or KRAZAN&ASSOCIATES,INC. With Offices Serving the Western United States 03417016 SSI Lathrop HASP Finel.doc