ANSWERS QUESTIONS. Attachment C scope of work does paragraph 3.4: Does this pertain only to bulk loads of waste or are less than truck load

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1 QUESTIONS ANSWERS Q1 I am interested in attending the pre-bid meeting on September A1 When you arrive, there will be a sign in sheet available. 12. I noticed the bid invite on the Onvia site. Please let me know if I need to register or if this notification is sufficient. Q2 Who is the previous contract holder? A2 Clean Venture/Cycle Chem Q3 The scope of work and table of contents mention an Emergency response component, however there is not a cost table for such. Can you clarify this discrepancy? A3 Emergency response is not requested as part of the scope of services in this RFP. References to emergency response found in Sections and 2.4 of the RFP were unintentionally included and should Q4 Q5 Attachment C scope of work paragraph 2.4: If a container is not in acceptable DOT conditions are we to assume we are required to look at all containers prior to scheduled pick up? If it is not acceptable at the time of pick up can we leave it behind or are we to be prepared for over packing at the time of pick up? If so how many over pack preparations should we have at each pick up call? Attachment C scope of work does paragraph 3.4: Does this pertain only to bulk loads of waste or are less than truck load A4 A5 be disregarded. PGW is not requesting that a separate site visit be conducted to examine containers prior to pick-up; however, PGW is requesting that the Successful Proposer identifies and rejects any containers that do not conform to DOT shipping requirements at the time of the waste pickup. In that case, PGW will consult with the Successful Proposer to identify actions needed to correct the situation and schedule another pickup for the rejected wastes. PGW makes every effort to ensure that waste is stored in appropriate containers suitable for offsite shipment and disposal; therefore, PGW does not expect this to be a problem during the course of the contract. Yes, paragraph 3.4 of Attachment C applies only to bulk loads of waste. Load sharing is allowed for dry van drums and containers. Page 1 of 7

2 Q6 Q7 Q8 Q9 Q10 (LTL) or load sharing allowed for dry van drums and containers? Attachment C scope of work does paragraph 4.2: The selected disposal facility may require specific lab data, requiring testing. If this occurs the removal requirements of paragraph 2.2 may not be attainable. Will PGW provide for an extension in such circumstances? # 1: Can PGW supply historic high and low values for the Exempt PCB concentrations from the Drip water/oil? # 1: Can PGW supply an MSDS or SDS of the Grade 40 Silica Gel? The LNG-V; 4A Molecular Sieve material? # 1: Can PGW supply historic high and low values for the Benzene content causing the Molecular Sieve material to be hazardous? # 1: Can PGW supply an MSDS or SDS of the corrosion A6 Yes, extensions are acceptable in this case. PGW s Chemical Services Department typically samples all waste streams prior to scheduling waste pickups so the data required will likely be available at the time that the pickup is requested. A7 Typically, PCBs are not detected in samples of drip water/oil. The highest PCB content in a sample of drip oil/water mixture collected over the past 4 years contained PCBs at a concentration of 23.0 mg/kg (Aroclor-1242). A8 Yes, please see Q&A Attachments 1, 2, and 3. A9 A10 In general, the dust removed from the molecular sieve vessels contained the highest benzene content; between 2013 and 2015, the benzene TCLP levels in the spent molecular sieve dust ranged from 130 to 230 mg/l. The spent but largely intact molecular sieve typically is non-hazardous, but the highest benzene TCLP obtained in a mixture of dust and intact spent molecular sieve was 1.3 mg/l TCLP. Yes, PGW utilizes either Corrshield MD407 or Corrshield MD4100 depending upon the location. Please see Q&A Attachment 4 for Page 2 of 7

3 inhibitor package identified in the Locations 5-11: Gas copies of the SDS for these inhibitor packages. Processing Metering and Regulating Stations? Q11 Will vacuum services include the vacuum of hazardous waste? A11 Yes, vacuum services may be required for hazardous wastes. Attachment E, Table E-1, Item #6 includes hourly rates for a vacuum truck and operator for vacuuming of hazardous waste. Q12 The RFP mentions a combined participation goal of 5-10% MBE, WBE, VOSBE; Does this goal apply directly to this RFP? If so, do you have a list of preferred or past approved used on projects for Philadelphia Gas Works? A12 Yes. The combined participation goal established is specifically for this RFP. We do not have a list of preferred or past approved vendors used for this type of work; however, if you need assistance with sourcing of certified diverse firms for subcontracting; you can contact Craig Campbell, Supplier Diversity Program Administrator Q13 May you provide the usage estimates per line item for 2016 and 2017 thus far? A13 directly at Craig.Campbell@pgworks.com for assistance. The typical frequency of services utilized per PGW location are included in Section 9.2 of Attachment C of the RFP. If time allows, PGW will issue an addendum to the RFP with specific usage estimates for each line item included in the cost tables. Q14 What is the estimated annual value for this opportunity? A14 Over the past four (4) years, PGW has spent an average of $144,000 per year on the scope of services included in this RFP. Q15 May we obtain the existing pricing per line item? A15 This information will be provided at a later time. Q16 Provide copies of all waste stream profiles for all the bulk material. A16 Please see Q&A Attachments 5 through 7 for representative waste characterization analysis of bulk materials. Q17 Please provide the 6 most recent invoice copies for the services A17 This information will be provided at a later time. outlined in this RFP. Q18 Please provide all analytical results for historically generated A18 Please see Q&A Attachments 5 through 7 for representative waste Page 3 of 7

4 Q19 Q20 PHILADELPHIA GAS WORKS the bulk material in tankers and roll offs What is the ppm of the arsenic at location #3/line item 3 on the price table D-2? Please describe in detail what the term heavies implies? (Item 9.2 page 48 Table D-1 item 1) What is the hazardous constituent? Q21 What hazardous component makes Table D-1 line item 3 ignitable and assigned the D001 code? What is the DOT hazard class? Is it flammable or combustible? A19 A20 A21 Q22 Are your sites considered Benzene NESHAP facilities? A22 No. Q23 Please list the mercury ppm for the material listed on table D- A23 2, line 8. Is it elemental or a mercury compound? Please list. Q24 Please further describe the PCB material on table D-2, lines 28 to 33? What is the solid material? Equipment, soil, debris? Is the liquid PCB oil, water contaminated with PCB? A24 characterization analysis of bulk materials. Ranges from 7.4 mg/kg to 10 mg/kg. Heavies include hexanes and heavier hydrocarbons removed from natural gas as part of PGW s gas processing operations. Heavies are considered hazardous primarily due to ignitability. Heavies may also contain benzene at concentrations greater than 0.50 mg/l. This material is flammable; the flashpoint is 130 degrees F. This waste stream contains multiple heavy hydrocarbons that contribute to the low flashpoint. The mercury content of the waste oil was 0.66 mg/kg; the waste oil was analyzed via EPA Method 7471A, so the mercury content represents total mercury. For solid material (D-2, Lines 28-30) assume that the material is soil and absorbent materials (i.e. oil dri, pads, and socks). For liquid material (D-2, Lines 31-33), liquid may be transformer oil or drip oil that contains PCBs or wastewater impacted with PCB-containing oil. Add additional lines to provide separate pricing for oil and water as needed. Q25 Please provide the waste profiles and analytical for the bulk A25 Please see Q&A Attachments 5 through 7 for representative waste items listed on price sheet D-3 in roll offs. characterization analysis of bulk materials. Q26 Please provide an example copy of a technical report A26 Please list N/A in place of a cost for these line items. Technical Page 4 of 7

5 Q27 Q28 Q29 Q30 Q31 Q32 Q33 mentioned in table D-5 line 1 and E-1 line 20. Please clarify how line 1 on Table D-2 is to be billed? Can this be charged each time drums are picked up on a scheduled LTL run? Are drums removed on a milk run basis, ie are multiple locations pickup up during one trip? On Table D-3, line 10. Does this charge cover hauling of line items 7-9 and 11-15? What size Frac Tank do you typically need for line 13 on Table E-1 What specific tank specifications are required for this line item? What size Weir Tank do you typically need for line 14 on Table E-1 What specific tank specifications are required for this line item? reports are not required as part of the scope of services included in this RFP. A27 PGW prefers that pricing be provided as a daily flat fee for drum pickup, which might include stops at multiple PGW locations. If you charge per stop rather than per day, indicate this along with the pricing. A28 Typically, drum pickups are scheduled separately for PGW s Passyunk and Richmond Plants on an as-needed basis. Drums are not often removed on a milk run basis. A29 Yes. Please add additional line items as needed if hauling costs vary by the mode of hauling (i.e. rolloff vs. dump truck, etc.) A30 The size of the Frac tank should be determined by work being conducted. You may offer pricing for several standard sizes of Frac tanks. In past work, ~20,000 gallon capacity Frac tanks have been commonly used. A31 Please see A30. A32 The size of the Weir tank should be determined by work being conducted. You may offer pricing for several standard sizes of Weir tanks. In past work, ~18,000 gallon capacity Weir tanks have been commonly used. A33 Please see A32. Page 5 of 7

6 Q34 Q35 Is the hourly rate for the vacuum truck/operator listed on Table E-1 lines 5 and 6 designed for on-site time only, or portal to portal? What containments and levels is the mobile waste water treatment system in table E-1 item 16 required to treat? In what situations has this system been utilized in the past by PGW? A34 A35 Portal to portal. In the past, PGW has filtered and disposed of waste water to the Philadelphia Water Department infrastructure under both a general and site-specific permit. Additionally, PGW has filtered and disposed of waste water using overland flow under permission from the Pennsylvania Department of Environmental Protection. The contaminants of concern listed in said permits have included the following: Total Suspended Solids Arsenic Barium Copper Lead Zinc Mercury PCBs Napthalene Phenathrene Pyrene Chrysene Oil and Grease Page 6 of 7

7 Benzene Total BETX MTBE ph Q36 What was the approximate spend for the services covered in this RFP in the last 12 months A36 $98,000 Page 7 of 7