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Site Visit and Offalte Reconnaissance former USTs location for a period of at least 20 trucks, approximately 100 picking ladders, and years prior to moving it to location of the several other miscellaneous items. A propane secondary containment structure (Plate 3). tank is present immediately north of the large w warehouse. Aluicultural Chemical Usage History A 120-foot deep domestic well, with a pump and According to Messrs. Lopez and Selover, the use reservoir, is located inside the small shed of agricultural chemicals at the Site includes mentioned above. An agricultural well, screened insecticides, herbicides, fungicides, and from about 100 to 220 feet bgs, is present along fertilizers. Fertilizers were applied seasonally the western side of the Site adjacent to with a large sprayer and include a product MacArthur Drive. This well appeared in good labeled Nutrient Buffer Spray 8-8-2 Zinc and condition and no stained soil or leakage from the Manganese. Herbicides are used to control weeds pump equipment was visible. between the rows of apricot trees and include products labeled as Preemergent Herbicide Along the eastern property boundary, Surflan (42 %Oryzalin active ingredient), and approximately half way between the northern glyphosphate-type systemic herbicides and southern boundaries, is a pile of debris that r.., (Roundup). Insecticides are generally applied includes an old washer, and old fan, a few old once a season before harvest. Insecticide use automobile tires, and miscellaneous wood debris included DDT until it was outlawed in the 1970s. including pallets, paneling, and lumber(Plate 2). In the 1970s DDT usage was replaced by the use Miscellaneous debris was also present within the of Parathion which was used until about 5 years irrigation runoff collection ponds in the ago. Parathion was replaced with Diazinon and northeastern corner of the Site. Debris included its use continued until two years ago when old automobile tires, and broken appliances. v Imidan (trade name, phosmet common name) use began. According to Mr. Lopez, agricultural 4.2 Offsite Reconnaissance chemicals were typically mixed with water adjacent to two concrete"water boxes"located ✓ The Site is bordered mostly by land under along MacArthur Drive along the west side of the cultivation. Predominant crops include apricot Site. During the site visit, an additional potential chemical mixing area was identified by the and walnut orchards. Immediately south of the .r presence of discolored soils adjacent to a "water Site is a cultivated but unplanted field. A dry stream bed is located a few feet south of and box" along the eastern site boundary. See Plate 2 parallel to the dirt road along the southern for the locations of the agricultural chemical boundary of the Site. The former winding stream mixing areas. +� bed (as observed in the 1963 and 1975 reviewed The above four RECs were verbally in Section 3.2) was reportedly straightened to its communicated to Teichert as preliminary present course in 1986. According to the �+ findings of the site visit and were the focus of the operations manager Mr. Selover, at the point Phase H Investigation that is presented later in where the former stream course was rerouted to this report. A few other relevant observations are trend along the road, problems have been described in the following paragraphs. encountered in the past with seasonal flow eroding into and undercutting the road. Several piles of old equipment, junk, and miscellaneous debris are present around the 6w miscellaneous in the southeast corner of the Site. Several old tractors,bulldozers, sprayers, trucks, cars, and other equipment are also present in this location. Inside the large barn/storage building are several 55 gallons drums of mineral spirits and motor oil, several 5 gallon plastic containers of agricultural chemicals and fertilizers,old refrigerators, agricultural sprayers, three automobiles, two ti+ G:\WMDN\GH3e371z.151 Harding Lawson Associates 7 r