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C NYI NQ SACRAMENTO Letter to Mr. Richard McCombs January S. 1988 Page 5 from the pond outfall channel, just upstream of the pump location where wastewater was pumped across the river {see Photo 4, Attachment 1I) . The samples were stored in pre-cleaned, four-ounce glass jars and sealed with Teflon-Tined lids. The samples were stored in a cooler and delivered to the Chemwest Analytical Laboratory in Sacramento. The laboratory results were verbally reported to Versar and are included as Table i in Attachment IV. The chemical analyses detected barium, trivalent chromium, copper, lead, vanadium, and zinc. Copper is present in concentrations well above normal background levels, and lead is present in slightly elevated concentrations. These levels do not represent a threat to the environment if they do not increase with depth and if the soil passes an Extraction Procedure Toxicity Test. A copy of the Chemwest laboratory report will follow under separate cover. At the time of the site visit, extensive demolition activities were being conducted. Demolition work created numerous debris piles and additional general refuse was present near the site entrance (see Photo 5, Attachment II). Numerous empty and partially filled chemical storage drums were scattered along the northern edge of the facility operations yard. Cnnclusionsns On the basis of the site assessment, evaluation of adjacent land uses, a review of the site history, and interviews with regulatory agencies, there are several areas of potential environmental concern which exist at the site. These are: (1) the presence of hydrocarbon contamination in the subsurface below the recently removed underground storage tank; (2) the presence of contaminated soil being stored improperly; (3) the presence of empty and partially filled chemical storage drums; (4) the presence of elevated levels of lead and copper in the soil below the process wastewater pond. The presence of hydrocarbons in the subsurface beneath the 15,000- gallon underground storage tank indicates that groundwater contamination may be occurring. However, there is no groundwater monitoring data to evaluate lateral and vertical migration of the contamination. Therefore, it would be prudent for the owners of the property to conduct a site investigation to verify the extent and levels of contamination. At the. time of Versar's visit on December__28,-1987, the- pile-o_f _ ---_ — T — _ --contaminated soil Pram-tie tank removal was exposed to the atmosphere. A permit from the San Joaquin County Air Pollution Control District is required in order to aerate contaminated soil. According to. a representative of Jim Thorpe Oil , Inc., no permit has been obtained for the aeration of contaminated soil . A permit should be obtained and aeration started as soon as possible. It is possible that if the