Section Env-Or 308.02 - Site Assessment After Removal(a) After dismantling and removing an AST system, the owner shall assess the site to determine whether there is soil or groundwater contamination, or both, attributable to the AST system if: (1) Any tank, valve, pump, or section of piping was in contact with the ground and did not have secondary containment; or(2) There is evidence that oil has been released from the AST system.(b) The assessment to determine if any contamination is present shall be performed using the following investigative methods, as applicable: (1) Test pits shall be excavated or soil borings advanced in the immediate vicinity of the AST system, and representative soil or groundwater samples shall be obtained;(2) Soil or groundwater samples shall be obtained from the ground surface immediately beneath the tanks, the test pits or soil borings, and beneath the adjacent system piping; and(3) All existing release detection devices or subsurface monitoring locations shall be sampled.(c) The soil or groundwater samples shall be screened for the presence of contamination in the field using sensory observation and an organic vapor analyzer.(d) A subset of those soil and groundwater samples screened which are representative of the conditions found in the vicinity of the AST system that was dismantled and removed, which includes a sample obtained from the same location as the screened sample that contained the highest concentration of volatile organics, shall be submitted to a laboratory accredited pursuant to Env-C 300 for analysis.(e) The soil and groundwater samples collected pursuant to (d), above, shall be analyzed for: (1) Volatile organic compounds (VOC) in the water matrix, and VOC and total petroleum hydrocarbons (TPH) as gasoline in the soil matrix, if the system stored gasoline or similar weight product(s);(2) VOC and polycyclic aromatic hydrocarbons (PAH) in the water matrix, and VOC, PAH, and TPH as fuel oil in the soil matrix, if the system stored diesel fuel, fuel oils, used oil, or similar weight product(s); and(3) Arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver using the toxicity characteristics leaching procedure (TCLP) as defined in method 1311 of SW-846, "Test Methods for the Evaluation of Solid Waste, Physical/Chemical Methods" in the soil matrix if the system stored used oil.(f) Laboratory analysis methods for the analyses described in (e), above, shall be as specified in Env-Or 600.(g) Results of the assessments performed under (b) and (c), above, and the laboratory analysis of samples performed under (d) and (e), above, shall be submitted to the department within 60 days of the AST system dismantling.N.H. Admin. Code § Env-Or 308.02
(See Revision Note at chapter heading for Env-Or 300) #10487, eff 2-7-14