Contra Costa Community College District

Contra Costa Community College District Diablo Valley College HVAC Equipment Evaluation Project Number: 246.04 Final Draft #4: September 2, 206 20 Mission Street, Suite 2000, San Francisco, CA 9405 Phone: (45) 896-0300 Fax: (45) 896-900

Job No. 246.04 Diablo Valley College HVAC Evaluation ACKNOWLEDGMENTS Valuable assistance and direction was provided for this project by Chris Meadors, Tony Melendrez, John Nahlen, Dan Teravest, David Lenahan, and Tracy Marcial.

Job No. 246.04 Diablo Valley College HVAC Evaluation TABLE OF CONTENTS SECTION : EXECUTIVE SUMMARY... 5 SECTION 2: APPROACH... 8 SECTION 3: PROJECT PRIORITIZATION... 6 SECTION 4: BUILDINGS AND HVAC EQUIPMENT... 32 SECTION 5: REPLACEMENT PROJECTS AND COST ESTIMATES... 65 SECTION 6: ENERGY SAVINGS POTENTIAL... 7 APPENDICES APPENDIX A HVAC EQUIPMENT INVENTORY APPENDIX B HVAC EQUIPMENT REPLACEMENT COST ESTIMATES APPENDIX C HVAC EQUIPMENT REPLACEMENT ENERGY SAVINGS APPENDIX D ASHRAE HVAC EQUIPMENT EXPECTED USEFUL LIFE APPENDIX E BUILDING INVENTORY INCLUDING MEASURE E PLANS AND STAFF COMMENTS

Job No. 246.04 Diablo Valley College HVAC Evaluation 5 SECTION : EXECUTIVE SUMMARY This Report was produced by Newcomb Anderson McCormick (NAM) for the Contra Costa Community College District. The Report covers an evaluation of heating ventilating and air conditioning (HVAC) equipment serving buildings at Diablo Valley College (DVC), which is one of the District s three colleges. This evaluation included an assessment of DVC s major pieces of HVAC equipment, with respect to their age, condition, efficiency, and operation, as well as any specific problems reported by staff. The report provides a cost estimate for the replacement of the existing HVAC equipment, as well as a projected plan for investment in replacement HVAC equipment over the next 20 years. The types of equipment evaluated include packaged air conditioning units, built up air handling units, heatinghot water boilers, chillers, and cooling towers (and associated hydronic pumps). The equipment evaluations consist of visual inspection of each unit, review of any available mechanical drawings, and a survey of the campus energy management system (EMS) connectivity and capabilities with respect to the equipment in the scope. Table A shows the total overview of the evaluation findings, and the estimated costs of the replacement or renewal projects by building. Table B shows the total costs of replacement or renewal projects by prioritization level. Table 2 shows the frequency of occurrence of the various deficiency observations. For a detailed discussion of the project prioritization approach, see Section 2.2 of this Report. A detailed look at the project priority by, at the individual unit level is found in Section 3. Number TABLE A OVERVIEW OF HVAC UNIT EVALUATION Number of Units Oldest Unit Vintage Newest Unit Vintage Total Base 206 Cost of Replacement or Renewal Projects Identified 68 Administration 8 989 20 $396,284 2 Advanced Technology Center 3 2005 2005 $263,372 97 Book Center 3 2006 2006 $72,848 94 Business and Foreign Language 6 200 200 $42,959 58 Engineering Technology Center 9 984 2002 $2,4,274 63 Faculty Office 2 97 999 $6,007 60 Family Life Education, North 2 997 998 $35,209 83 Family Life Education, South 20 20 $92,277 3 Humanities 4 2003 2003 $620,203 6 Learning Center 7 99 204 $32,560

6 Job No. 246.04 Diablo Valley College HVAC Evaluation Number Number of Units Oldest Unit Vintage Newest Unit Vintage Total Base 206 Cost of Replacement or Renewal Projects Identified 59 Learning Communities Annex (Old Counseling) 3 999 999 $68,356 62 Liberal Arts 2 2005 2005 $504,504 57 Library 32 963 206 $3,235,327 2 Life Health Science 0 987 2003 $979,697 9 Math 4 998 203 $27,359 9 Music 7 985 2008 $44,76 23 Performing Arts 5 972 2002 $798,042 Physical Education 0 965 205 $560,896 92 Physical Sciences 6 998 999 $59,853 San Ramon Center 6 999 2006 $,48,443 4, 7, 72, 73, 74, 75, 76, 78 Science Center 6 985 2007 $389,698 90 Student Union 8 996 2004 $423,320 47 Women's Locker Room 3 986 20 $39,734 Total 78 963 206 $4,430,398 TABLE 2B OVERVIEW OF HVAC UNIT EVALUATION DEFICIENCY PRIORITY Deficiency Priority Level Number of Units Total Base 206 Cost of Replacement or Renewal Projects Identified Priority 70 $5,805,58 Priority 2 5 $894,688 Priority 3 24 $,545,883 Priority 4 6 $5,648,93 Priority 0 8 $535,333 Total 78 $4,430,398

Job No. 246.04 Diablo Valley College HVAC Evaluation 7 TABLE 2 FREQUENCY OF EQUIPMENT DEFICIENCIES ENCOUNTERED DURING THE EVALUATION Observation Occurrence Deficiency Priority Equipment age is significantly past its expected useful life (EUL) 26% Deformation, discoloration, contamination or oxidation of component surfaces 55% 2 Fluid or vapor leakage evidence 3% Excessive or abnormal noise or vibration 22% Loose or missing fasteners 3% 3 Unusual ice, frost or condensate formation 2% 2 Worn or damaged electrical or thermal insulating material 37% 2 Unacceptably high levels of surface corrosion or scale accumulation 2% 2 Unacceptable high accumulated dirt or sludge 3% 3 Visible biological growth (funghi, algae or bacteria) 2% 3 Failure of an essential insulation system; condensation or physical damage present % Clogged or overflowing drains % 2 Overheated electrical equipment 0% Obviously failed equipment (component, not entire unit) % Holes/leaks in ducts and/or flex connections 4% Abnormal building pressures 2%

8 Job No. 246.04 Diablo Valley College HVAC Evaluation SECTION 2: APPROACH The focus of this evaluation is the primary HVAC equipment serving the buildings in the scope. The types of equipment evaluated include packaged air conditioning units of 2 ton cooling capacity and up, built up air handling units of 2,000 capacity and up, heating hot water boilers, chillers, and cooling towers. Hydronic pumps were evaluated as part of their respective primary equipment (i.e., heating hot water pumps are associated with boilers, chilled water pumps are associated with chillers, condenser water pumps are associated with cooling towers). A later stage of this report will include an evaluation of the window units/packaged terminal air conditioners (PTACs) serving many of the individual offices on Campus. In pursuit of assessing this equipment, NAM reviewed all available mechanical drawings on file at the District Offices. This was followed up by physical equipment inspections at the buildings, as well as an inspection of the Campus Andover building automation system (BAS) to see the current centralized control capabilities. In many cases the available drawings did not reflect the equipment that was found at the buildings. In addition, there are pieces of equipment at the buildings that do not appear to be controlled by the BAS because they are not represented on its control screens. 2. HVAC EQUIPMENT INVENTORY The first step in the HVAC equipment evaluation process is to create a uniform inventory of all existing units. Staff has indicated that they do not currently have a single file where all the relevant equipment information can be maintained. The HVAC equipment inventory is a single spreadsheet workbook, containing separate worksheets for the various major types of equipment: packaged air conditioning units, air handlers, other fans, chillers, cooling towers, and boilers. Each HVAC unit evaluated is uniquely identified in the workbook. Units are identified in the workbook in several ways: Common unit name found in mechanical drawings, field markings, or the BAS Unique identification number generated by NAM (see Section 2..) Unit location Area served Manufacturer and model number Once uniquely identified, the inventory workbook lists relevant data regarding the unit, such as unit type, configuration characteristics, capacity from the plans and equipment manuals, efficiency, electrical characteristics, and other information available from the nameplate. In addition to the design data, the inventory includes a checklist and notes regarding observations of its condition at the time that this evaluation was conducted (Winter Spring, 205 206).

Job No. 246.04 Diablo Valley College HVAC Evaluation 9 The HVAC Equipment Inventory can be found in Appendix A, and has also been provided in digital format. 2.. HVAC EQUIPMENT IDENTIFICATION One common problem with creating an equipment inventory is the prevalence of inconsistent unit names. Units may have differing names on mechanical drawings, markings in the field, and within the BAS. Different staff members may know the units by different names. Unit names may change over time. To minimize this problem with respect to this HVAC evaluation, NAM has provided each piece of equipment with a unique identification number (referred to as the NAM ID number in this report). The NAM ID numbers are consistently used within this report to keep track of the inventory, conditions assessment, replacement cost estimates and the photo archive. This approach also aids in figuring out where units have varying names between other references. During the field inspections of the units, a physical tag was attached to each unit showing its NAM ID number. The tags have been attached such that they can be easily removed by staff if required, but it is recommended that they be maintained in place in conjunction with the equipment inventory. When units are replaced, it is recommended that the tags are transferred to the new equipment. FIGURE TYPICAL NAM IDENTIFICATION TAG IN THE FIELD

0 Job No. 246.04 Diablo Valley College HVAC Evaluation 2..2 HVAC EQUIPMENT PHOTOGRAPH ARCHIVE During the field evaluation process, many photographs were taken of the units. These include photos of the equipment nameplates, NAM ID tag, general shots of the unit and location, details of any operational problems, and screenshots of the BAS interfaces. These have been organized into a digital file, subdivided by building and then NAM ID number. This file has been provided in digital format to the District and Campus. 2.2 HVAC EQUIPMENT PROJECT PRIORITIZATION Prior to the on site evaluations, NAM had meetings with Campus s and Grounds staff to get information about how the equipment was performing from an operations and maintenance standpoint, and hear about any recurring problems they have been experiencing. After that, the on site inspections were conducted for every piece of equipment in the scope. As a result of these observations, the units were checked for the commonly encountered deficiencies shown in Section, Table 2. In addition to checking for common deficiencies, any uncommon findings were noted as found in the field or reported by the s and Grounds staff. These are included in the Notes area of the Equipment Inventory. The notes area was also used to modify any of the checked off common deficiencies (e.g., a Priority deficiency that was deemed to be not severe, or a Priority 2 deficiency that was deemed to be severe enough to warrant Priority treatment). Based on the observed deficiencies, the units were categorized by deficiency priority. The descriptions of the priority categories shown below is meant to be general. Given that 76 pieces of equipment were evaluated, at times special cases arose. Certain units that may display a single priority deficiency as described below, but observed to be not severe, and occurring on a newer unit, have been placed on lower priority levels. Other units that displayed multiple, severe priority 2 deficiencies described below, have been placed in the priority category, especially for units that are at or near the end of their expected useful life. Detailed descriptions of the unit conditions can be found in Section 4 and the Notes area of Appendix A. The HVAC equipment studied here has been categorized by deficiency prioritization as defined below: Priority : This applies to equipment that is significantly past its expected useful life (EUL), combined with significant observed deficiencies, associated with the equipment age. This equipment at DVC is typically 3 years past its expected useful life, on average. Equipment in this priority category typically have some combination of fluid or vapor leakage, excessive noise and vibration, damaged or failed electrical and thermal insulation, other physical damage, failed major subcomponents, and leaking ducts. Equipment in this priority category should receive attention before others. No action with regards to this equipment may lead to further deterioration and eventual failure. Priority 2: This applies to equipment that is at the end of, or just recently passed its expected useful life, combined with a moderate number of observed deficiencies. This equipment at DVC is typically 0 to 3 years past its expected useful life. These units were typically observed to have high levels of surface deformation, oxidation, other corrosion or scale accumulation, unwanted surface condensation, worn electrical and thermal insulation, and clogged and overflowing drains. Equipment in this priority category should receive attention after Priority equipment is addressed. No action with regards to this

Job No. 246.04 Diablo Valley College HVAC Evaluation equipment may lead to accelerated decline in performance of the systems and elevated maintenance activities. Priority 3: This applies to equipment that has some remaining useful life combined with minor observed deficiencies. This equipment at DVC typically has 3 to 7 years of remaining useful life. The units were typically observed to have loose or missing fasteners, high accumulated dirt or sludge on or around the unit, or visible biological growth. Equipment in this category does not require immediate action, but should be considered for replacement in the medium term (5 to 7 years out). Priority 4: This applies to equipment that is new or relatively new, with few minor deficiencies observed. This equipment typically has 5 to years of remaining useful life, or more. This equipment does not need to be considered for replacement, except for long term planning purposes (0 years out). Priority 0: This applies to equipment that was included in the inventory, but does not warrant replacement consideration because the building or area it serves will be demolished or undergo major renovation soon (less than 5 years), and therefore the unit will no longer be in service. These units are not in failure mode and are expected to server their intended purpose until no longer needed. 2.3 HVAC EQUIPMENT REPLACEMENT PROJECTS AND COST ESTIMATES A cost estimate has been generated for the replacement or refurbishment of each unit identified in the HVAC equipment inventory. The general approach to replacement and refurbishment is as follows: Replace packaged air conditioning units with premium efficiency (8+ SEER). This equipment typically has variable air volume supply fans, variable speed compressors and possibly variable speed condenser fans. Refurbish interior located built up air handling units with new premium efficiency motors, new heating and cooling coils, two way electronic temperature control valves, electronic damper actuators; convert pneumatic controls to full direct digital control (DDC) (at the unit itself; units with remaining pneumatic controls were single zone units), convert constant volume units to variable air volume and retrofit fans with variable frequency drives (VFDs). Replace exterior located air handling units with new variable air volume, full DDC air handling units. Replace chillers with premium efficiency units with variable speed compressors and variable primary chilled water flow; replace chilled water pumps with VFD equipped units. Projects include pipe modifications to accommodate the new chillers and pumps, but not distribution improvements. Replace cooling towers with premium efficiency, variable speed fan units; replace condenser water pumps with VFD equipped units. Projects include pipe modifications to accommodate the new cooling towers and pumps. Replace heating hot water boilers with premium efficiency units; replace heating hot water pumps with VFD equipped units. Projects include pipe modifications to accommodate the new boilers and pumps, but not distribution improvements. Cost estimates for these projects have been generated using a combination of recent costs for similar projects

2 Job No. 246.04 Diablo Valley College HVAC Evaluation for similar sites in the region, new engineering quotes from equipment vendors, and RS Means cost estimating data. Cost estimates presented here include material, labor, contractor overhead and profit, contingency, engineering, construction phase services, and project management. See Section 5 for a detailed discussion of the cost estimating approach.

Job No. 246.04 Diablo Valley College HVAC Evaluation 3 2.4 ENERGY SAVINGS POTENTIAL EVALUATION 2.4. SINGLE ZONE PACKAGED UNITS The replacement of packaged rooftop units offers significant opportunity for efficiency improvement. The efficiency of packaged units over 5 tons is measured at full load by the Energy Efficiency Ratio (EER) which is defined as the ratio of net cooling capacity or heat removed in Btu/h to the total input rate of electric power applied in Watts. Recently the California minimum EER has ranged between 0 or, according to Title 24. A better measure of seasonal efficiency is the Integrated Energy Efficiency Ratio (IEER). This is a weighted average of the packaged unit s EER at part load as well as full load conditions. IEER targets from Energy Star and the Consortium for Energy Efficiency are in the range of 2 to 3 Btu/Wh. The application of VFDs to packaged units has allowed the part load efficiency to increase significantly over the last few years, leaving these efficiency standards behind. It is now possible to buy packaged units up to 20 tons with IEERs of 8 to 2.5 Btu/Wh from the typical manufacturers: Trane, Carrier, Lennox, AAON and Daikin. On average, these will use one third less electricity than other brand new units that meet the California guidelines from Titles 20 and 24. We recommend that all single zone packaged units be replaced with units with an IEER of at least 8 Btu/Wh. These will operate as single zone variable air volume units. Single zone packaged units of less than 5 tons are rated by the Seasonal Energy Efficiency Ratio (SEER), which is also a measure of the number of Btus of cooling which can be provided by one Watt hour of electricity. As with the IEER this is a metric designed to capture part load efficiency better than the EER. For these smaller package units it is recommended that units with an SEER of 8 or greater be purchased. 2.4.2 MULTIZONE PACKAGED UNITS Multizone packaged units are constant volume air handlers which rely on the mixing of heated and cooled air to control temperatures in individual zones. These are not allowed under current Title 24 standards. When these units reach the end of their life they could be replaced by rooftop packaged VAV units and VAV reheat boxes installed inside the building, as in new construction. However, the difficulty and disruption involved in installing the VAV boxes and the hot water piping connected to every box is significant. In an alternative option, the multizone rooftop units would be replaced by triple duct VAV rooftop packaged units. These are variable air volume air handlers which mix air from three ducts to control temperature at each zone: hot deck, cold deck and bypass air. This allows the temperature of each zone to be controlled without mixing any hot and cold air, as the hot or cold air is only mixed with bypass (unconditioned) air. The dampers operate in a variable flow manner to save fan energy. The installation of this type of unit eliminates the need for work inside the building, as all necessary dampers are located inside the package unit. One disadvantage to the triple duct VAV approach is that these units tend to be larger than the existing multizone units and weigh more as well. The structural capacity of the roof will need to be evaluated in each

4 Job No. 246.04 Diablo Valley College HVAC Evaluation case. Ultimately, at the Engineering Technology Center (ETC) this option was considered but these impacts were found to be unacceptable. Since the building is scheduled to undergo a major renovation in 2023 under the Measure E strategic plan, the College prefers to install rooftop packaged VAV units and VAV reheat boxes inside the building. The disruption associated with installation is somewhat minimized because the building mostly has an open ceiling with exposed infrastructure (ducts, conduit, pipes), and the VAV reheat design will be most flexible when adapting to any building changes included in the renovation. A second alternative option is to replace multizone units with ductless variable refrigerant flow (VRF) systems. This design incorporates individual DX cooling cassettes for each zone, with multiple heating/cooling cassettes connected to a single DX circuit and a variable speed compressor/condensing unit. The existing multizone units can be replaced with simple outside air supply and exhaust fans, and the existing ductwork retained to only supply the zones with the minimum outside air required. VRF systems provide high efficiencies at part load conditions, as well as when different zones require simultaneous heating and cooling. These systems have a disadvantage in that they do not allow for air side economizer operation, but their high efficiency during simultaneous heating and cooling alleviates this somewhat. The installation of the system will require only DX line and electrical distribution be added, which should be less disturbing to campus operations than new ductwork, terminal boxes, and new HHW lines that would have to be installed if the system were converted to a standard VAV reheat system. This is the system that is recommended to replace the multizone units at the Humanities. 2.4.3 AIR HANDLING UNITS The replacement of components on air handlers will include a conversion to variable air volume (VAV) wherever possible. This provides a significant improvement in energy efficiency over a typical constant volume air handler, while meeting building heating and cooling loads. This is the default design of practically every air conditioning system installed today, so it will bring older equipment up to date. Where constant volume, multi zone air handling units are converted to VAV, new variable air volume terminal units will be required. For single zone units converted to VAV, this is not necessarily a requirement, since the fan speed can respond directly to the single zone thermostat. In some cases it may be appropriate to make the conversion to VAV before the useful life of the fan motor has been reached, solely on the basis of energy savings. 2.4.4 CHILLERS Chillers are found at this campus at multiple buildings. Like packaged units, chillers have improved significantly in the last few years through the use of variable speed drives on small centrifugal chillers, particularly with frictionless, variable speed compressors (e.g., Turbocor). This has brought large chiller part load efficiencies (0.3 to 0.4 kw/ton) down to chillers in the 00 ton range. These chillers will be recommended for any larger loads at the campus. They are available either in water cooled or air cooled configurations.

Job No. 246.04 Diablo Valley College HVAC Evaluation 5 The installation of these larger chillers will include converting the loops to variable air flow. This will include VFDs at some existing chilled water pumps, as well as conversion of air handler chilled water control valves from 3 way to 2 way for additional energy savings. Variable capacity scroll compressors are available down to 20 tons or so. These are typically air cooled, often with VFD controlled fans. These chillers are not only more efficient than old scroll and screw compressors, they are available with factory installed primary chilled water pumps which simplifies the pumping system with a more efficient approach. 2.4.5 BOILERS Modern boilers typically have a slightly better combustion efficiency than conventional boilers, as well as combustion systems which significantly reduce emissions. However, replacing natural draft boilers with forced draft boilers significantly reduces the unit s standby losses. The only time a significant improvement in boiler efficiency is expected is when a condensing boiler is installed. These are used only when return water temperatures are significantly lower than 40⁰F. However, when heating 80⁰F water from a swimming pool they can provide significant energy savings over conventional boilers. Condensing boilers should be used for most heating hot water systems in our bay area climates. At variable loads, with 2 row valves on coils, and hot water reset temperatures implemented, the return water temperatures can get down to levels where condensing boilers present savings (<40 F) during a high percentage of time. This should be looked at on a case by case basis, after implementing HW supply temperature reset, variable flow HHW pumping, and other approaches to lower return HHW temperature. 2.4.6 CONTROLS Improved control sequences are necessary for many of these modifications. In each case the controls will need to be integrated with a central control system. The improvement and expansion of the campus BAS is not included in this scope of work, as the campus will be addressing that in a follow up evaluation of the BAS.

6 Job No. 246.04 Diablo Valley College HVAC Evaluation SECTION 3: PROJECT PRIORITIZATION Each HVAC unit included in the inventory has been prioritized for replacement and renewal. The priority categorization is assigned based on the observed conditions in the field, taking into account both the age of the equipment and observed operating deficiencies or lack thereof. The five project priority categories ( through 4, 0) are described in detail in Section 2.2 of this report. Table 3A shows the project prioritization grouped by priority level. Table 3B shows the project prioritization grouped by. The DVC Measure E Implementation Plan includes renovations to existing buildings and building demolition. These Measure E projects are identified in Table 3A and 3B, in the column titled Measure E Strategic Plan, along with the projected renovation or demolition year. The Plan also includes an allocation for System improvements. Projects that may qualify for this funding are labeled Potential System Projects.

Job No. 246.04 Diablo Valley College HVAC Evaluation 7 TABLE 3A HVAC PROJECT PRIORITY LIST, GROUPED BY PRIORITY LEVEL NAM ID Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified Priority 00 MZ $ 34,832 002 MZ 2 $ 34,832 003 Engineering MZ 3 $ 34,832 004 Renovate 2023 58 Technology MZ 4 $ 34,832 005 Center MZ 5 $ 34,832 006 MZ 6 $ 34,832 00 AC $ 008 Potential MZ AC 3 $ 46,68 9 Music 007 Systems Project Chiller $ 30,60 023 AH 5 $ 23,595 025 AH 7 $ 35,396 Potential 026 Performing Arts AH 8 $ 35,396 23 024 Center Systems Project AH $ 23,595 022 AH 4 $ 23,595 030 A/C 3 $ 23,595 042 Potential AHU 2 $ 84,53 043 92 Physical Sciences AHU 3 $ 25,870 04 Systems Project AHU $ 206,787

8 Job No. 246.04 Diablo Valley College HVAC Evaluation Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified NAM ID 052 AC 2 $ 23,595 055 AC 4 $ 23,595 056 AC $ 93,750 057 AC2 $ 93,750 058 AC3 $ 93,750 059 AC4 $ 93,750 060 AC $ 3,244 06 AC 2 $ 3,244 062 AC 3 $ 3,244 063 Potential AC 4 $ 3,244 064 57 Library AC 5 $ 3,244 065 Systems Project AC 6 $ 3,244 066 AC 7 $ 3,244 067 AC 8 $ 3,244 068 AC 9 $ 3,244 069 AC A $ 3,244 070 AC B $ 3,244 07 AC 2 $ 3,244 072 AC 3 $ 3,244 073 AC 4 $ 3,244 083 AC 6 $ 23,595 08 AH 2 $ 28,975 082 Potential AH 5 $ 28,975 074 Physical Education C $ 4,289 077 Systems Project B $ 09,83 09 HV 3 $ 23,595 098 AC South $ 5,472 Demolish 2026 63 Faculty Office 097 AC North $ 9,535 05 Potential Systems Project 2 Life Health Science Priority Chiller $ 406,98

Job No. 246.04 Diablo Valley College HVAC Evaluation 9 Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified NAM ID 0 AC $ 47,598 AC2 $ 47,598 3 Renovate 2024 6 Learning Center AC5 $ 47,598 4 AC6 $ 47,598 5 AC4 $ 47,598 8 AC 2 $ 6,883 Potential 9 AC 3 $ 50,495 68 Administration 20 Systems Project AC 4 $ 48,900 24 AC 8 $ 60,32 Potential 30 9 Math Systems Project AC 2 $ 55,563 47 Renovate TBD San Ramon Center CU 7 $ 6,727 4, 7, 5 72, 73, Demolish 2025 Science Center 74, 75, $ 60,32 53 76, 78 3 $ 70,650 70 Renovate 209 47 Women's Locker Room MV 4 $ 23,595 North Unit, 7 North $ 64,559 72 Potential Systems Project 60, 83 Family Life Education Priority South Unit, North $ 70,650 57 AC $ 2,538 58 AC 2 $ 2,538 59 Potential AC 3 $ 60,32 60 90 Student Union AC 4 $ 82,86 6 Systems Project AC 5 $ 60,32 62 AC 6 $ 70,650 63 AC 7 $ 70,650 Subtotal Priority Equipment Costs $ 5,805,58 Engineering Technology 0 Renovate 2023 58 Center AC 5 $ 25,724 2

20 Job No. 246.04 Diablo Valley College HVAC Evaluation NAM ID Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified Priority 07 Potential 9 Music AC 2 $ 50,495 2 06 Systems Project AC $ 25,724 2 03 Potential Performing Arts 23 Center Systems Project RT $ 2,538 2 033 AC $ 65,682 2 Potential 034 Business and 94 AC 2 $ 65,682 2 035 Foreign Language Systems Project AC 3 $ 65,682 2 036 AC 4 $ 65,682 2 Potential 079 Physical Education Systems Project AH 4 $ 23,595 2 03 Potential AC $ 38,70 2 Life Health 04 2 Science AC 2 $ 38,70 2 06 Systems Project CT $ 77,404 2 29 Potential AC $ 62,940 2 9 Math 3 Systems Project AC 3 $ 60,32 2 49 Potential Systems Project 2 Advanced Technology Center AC $ 07,889 2 Subtotal Priority 2 Equipment Costs $ 894,688 Engineering Technology 02 Renovate 2023 58 Center AC $ 64,559 3

Job No. 246.04 Diablo Valley College HVAC Evaluation 2 028 028 027 NAM ID Measure E Strategic Plan Potential Systems Project Total Base 206 Cost of Replacement or Number ID Renewal Projects Identified Priority South Rooftop Unit $ 2,538 3 South Rooftop 23 Unit $ 2,538 3 Performing Arts North Center Rooftop Unit $ 2,538 3 Inaccessible for tag AH 3 $ 23,595 3 08 Cooling Tower $ 48,62 3 Potential 037 Systems Project 94 Business and Foreign Language AC 5 $ 57,689 3 040 Potential 92 Physical Sciences EF 2 $ 29,478 3 039 Systems Project EF $ 29,478 3 053 Potential FC $ 23,595 3 57 Library 044 Systems Project CH 2 $ 4,289 3 Potential 080 Systems Project Physical Education AH $ 28,975 3 090 AC4 $ 23,595 3 Demolish 2026 62 Liberal Arts 092 AC6 $ 23,595 3 099 Potential Life Health CU4 $ 34,84 3 2 02 Science Systems Project CU $ 6,836 3 7 Potential AC $ 6,883 3 68 Administration 23 Systems Project AC 7 $ 82,86 3 25 RTU $ 239,45 3 Potential 26 RTU 2 $ 239,45 3 3 Humanities 27 Systems Project AC East $ 70,650 3 28 AC West $ 70,650 3

22 Job No. 246.04 Diablo Valley College HVAC Evaluation 48 66 NAM ID Measure E Strategic Plan Potential Systems Project Potential Systems Project Number ID 2 Total Base 206 Cost of Replacement or Renewal Projects Identified Priority Advanced Technology Center AC 2 $ 62,940 3 97 Book Center AC 2 $ 62,940 3 Subtotal Priority 3 Equipment Costs $,545,883 04 Potential AC 4 $ 47,598 4 05 9 Music AC 5 $ 47,598 4 03 Systems Project Boiler $ 92,544 4 02 Potential Boiler #2 $ 56,348 4 Performing Arts 020 23 Boiler # $ 56,348 4 Center 09 Systems Project Chiller $ 26,806 4 Potential 032 Systems Project 94 Business and Foreign Language B $ 92,544 4 038 Potential Systems Project 92 Physical Sciences B $ 5,727 4 084 AC,2,3 $ 39,447 4 054 FC 3 $ 23,595 4 050 AC $ 23,595 4 049 Potential AC/ $ 28,975 4 046 57 Library CH $ 732,840 4 045 Systems Project CT $ 55,484 4 047 B $ 275,855 4 048 B 2 $ 275,855 4 05 FCU 2 $ 23,595 4 078 Potential P $ 48,89 4 075 Physical Education B 2 $ 63,709 4 076 Systems Project B 3 $ 63,709 4

Job No. 246.04 Diablo Valley College HVAC Evaluation 23 Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified NAM ID 087 AC $ 23,595 4 09 AC5 $ 23,595 4 093 AC7 $ 23,595 4 095 AC9 $ 23,595 4 Demolish 2026 62 Liberal Arts 088 AC2 $ 23,595 4 089 AC3 $ 23,595 4 094 AC8 $ 23,595 4 096 AC0 $ 23,595 4 00 EF $ 29,478 4 Potential 0 Life Health 2 Science EF 2 $ 29,478 4 07 Systems Project B $ 09,83 4 08 B 2 $ 09,83 4 6 AC7 $ 6,883 4 Renovate 2024 6 Learning Center 2 AC3 $ 57,689 4 2 Potential AC 5 $ 60,32 4 22 68 Administration Systems Project AC 6 $ 60,32 4 Potential 32 Systems Project 9 Math Boiler $ 92,544 4 38 AHU 6 $ 28,975 4 39 AHU 3 $ 28,975 4 40 AHU 4 $ 28,975 4 42 AHU $ 33,340 4 43 AHU 5 $ 28,975 4 46 AHU 2 $ 28,975 4 47a AHU 7 $ 23,595 4 33 Renovate TBD San Ramon Center CH $ 43,70 4 34 CT $ 77,404 4 36 B 2 $ 275,855 4 37 EF $ 7,32 4 45 EF 5 $ 29,478 4 35 B $ 275,855 4 4 EF 3 $ 0,4 4 44 EF 4 $ 0,4 4 Priority

24 Job No. 246.04 Diablo Valley College HVAC Evaluation NAM ID Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified Priority Potential Advanced Technology 50 Systems Project 2 Center B $ 92,544 4 Demolish 2025 4, 7, 72, 73, 74, 75, Science Center 52 76, 78 2 $ 60,32 4 65 Potential AC $ 65,682 4 67 Systems Project 97 Book Center B $ 44,227 4 69 Women's Locker HV $ 23,595 4 Renovate 209 47 68 Room B $ 92,544 4 Potential 73 Systems Project 60, 83 Family Life Education South $ 92,277 4 64 Potential Systems Project 90 Student Union B $ 36,32 4 Subtotal Priority 4 Equipment Costs $ 5,648,93 56 4, 7, AH $ 23,595 0 54 Demolish 2025 72, 73, 74, 75, Science Center CH $ 30,60 0 55 76, 78 B $ 44,227 0 086 Chiller $ 59,37 0 Demolish 2026 62 Liberal Arts 085 B $ 09,83 0 74 Learning MZ 3 $ 7,089 0 75 Demolish 2026 59 Communities MZ 2 $ 7,089 0 76 Annex MZ $ 34,78 0 Subtotal Priority 0 Equipment Costs $ 535,333 TOTAL COSTS $ 4,430,398

Job No. 246.04 Diablo Valley College HVAC Evaluation 25 Measure E Strategic Plan TABLE 3B HVAC PROJECT PRIORITY LIST, GROUPED BY BUILDING Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified NAM ID Priority 00 MZ $ 34,832 002 MZ 2 $ 34,832 003 MZ 3 $ 34,832 004 MZ 4 $ 34,832 Renovate Engineering 005 58 MZ 5 $ 34,832 2023 Technology Center 006 MZ 6 $ 34,832 00 AC $ 0 AC 5 $ 25,724 2 02 AC $ 64,559 3 04 AC 4 $ 47,598 4 05 AC 5 $ 47,598 4 06 Potential AC $ 25,724 2 07 9 Music AC 2 $ 50,495 2 Systems 008 Project MZ AC 3 $ 46,68 007 Chiller $ 30,60 03 Boiler $ 92,544 4

26 Job No. 246.04 Diablo Valley College HVAC Evaluation Total Base 206 Cost of Replacement NAM ID Measure E Strategic Plan Number ID or Renewal Projects Identified Priority South Rooftop 028 Unit $ 2,538 3 028 South Rooftop Unit $ 2,538 3 027 North Rooftop Unit $ 2,538 3 03 RT $ 2,538 2 024 Potential AH $ 23,595 Inaccessible Performing Arts 23 for tag Systems Center AH 3 $ 23,595 3 023 Project AH 5 $ 23,595 022 AH 4 $ 23,595 025 AH 7 $ 35,396 026 AH 8 $ 35,396 030 A/C 3 $ 23,595 09 Chiller $ 26,806 4 08 Cooling Tower $ 48,62 3 020 Boiler # $ 56,348 4 02 Boiler #2 $ 56,348 4 033 AC $ 65,682 2 034 Potential AC 2 $ 65,682 2 035 Business and AC 3 $ 65,682 2 94 036 Systems Foreign Language AC 4 $ 65,682 2 037 Project AC 5 $ 57,689 3 032 B $ 92,544 4 039 EF $ 29,478 3 040 Potential EF 2 $ 29,478 3 04 AHU $ 206,787 92 Physical Sciences 042 Systems AHU 2 $ 84,53 043 Project AHU 3 $ 25,870 038 B $ 5,727 4

Job No. 246.04 Diablo Valley College HVAC Evaluation 27 Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified NAM ID Priority 050 AC $ 23,595 4 05 FCU 2 $ 23,595 4 052 AC 2 $ 23,595 053 FC $ 23,595 3 054 FC 3 $ 23,595 4 055 AC 4 $ 23,595 056 AC $ 93,750 057 AC2 $ 93,750 058 AC3 $ 93,750 059 AC4 $ 93,750 060 AC $ 3,244 06 AC 2 $ 3,244 062 AC 3 $ 3,244 063 AC 4 $ 3,244 064 Potential AC 5 $ 3,244 065 AC 6 $ 3,244 57 Library 066 Systems AC 7 $ 3,244 067 Project AC 8 $ 3,244 068 AC 9 $ 3,244 069 AC A $ 3,244 070 AC B $ 3,244 052 AC 2 $ 3,244 072 AC 3 $ 3,244 055 AC 4 $ 3,244 083 AC 6 $ 23,595 084 AC,2,3 $ 39,447 4 049 AC/ $ 28,975 4 046 CH $ 732,840 4 045 CT $ 55,484 4 047 B $ 275,855 4 048 B 2 $ 275,855 4 044 CH 2 $ 4,289 3

28 Job No. 246.04 Diablo Valley College HVAC Evaluation NAM ID Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified Priority 079 AH 4 $ 23,595 2 080 AH $ 28,975 3 08 AH 2 $ 28,975 082 Potential AH 5 $ 28,975 09 HV 3 $ 23,595 Physical Education 074 Systems C $ 4,289 075 Project B 2 $ 63,709 4 076 B 3 $ 63,709 4 077 B $ 09,83 078 P $ 48,89 4 087 AC $ 23,595 4 088 AC2 $ 23,595 4 089 AC3 $ 23,595 4 090 AC4 $ 23,595 3 09 AC5 $ 23,595 4 092 Demolish AC6 $ 23,595 3 62 Liberal Arts 093 2026 AC7 $ 23,595 4 094 AC8 $ 23,595 4 095 AC9 $ 23,595 4 096 AC0 $ 23,595 4 086 Chiller $ 59,37 0 085 B $ 09,83 0 097 Demolish AC North $ 9,535 63 Faculty Office 098 2026 AC South $ 5,472

Job No. 246.04 Diablo Valley College HVAC Evaluation 29 NAM ID Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified Priority 099 CU4 $ 34,84 3 00 EF $ 29,478 4 0 EF 2 $ 29,478 4 02 Potential CU $ 6,836 3 03 AC $ 38,70 2 2 Life Health Science 04 Systems AC 2 $ 38,70 2 05 Project Chiller $ 406,98 06 CT $ 77,404 2 07 B $ 09,83 4 08 B 2 $ 09,83 4 0 AC $ 47,598 AC2 $ 47,598 2 AC3 $ 57,689 4 Renovate 3 6 Learning Center AC5 $ 47,598 2024 4 AC6 $ 47,598 5 AC4 $ 47,598 6 AC7 $ 6,883 4 7 AC $ 6,883 3 8 AC 2 $ 6,883 9 Potential AC 3 $ 50,495 20 AC 4 $ 48,900 68 Administration 2 Systems AC 5 $ 60,32 4 22 Project AC 6 $ 60,32 4 23 AC 7 $ 82,86 3 24 AC 8 $ 60,32 25 Potential RTU $ 239,45 3 26 RTU 2 $ 239,45 3 3 Humanities 27 Systems AC East $ 70,650 3 28 Project AC West $ 70,650 3 29 Potential AC $ 62,940 2 30 AC 2 $ 55,563 9 Math 3 Systems AC 3 $ 60,32 2 32 Project Boiler $ 92,544 4

30 Job No. 246.04 Diablo Valley College HVAC Evaluation NAM ID Measure E Strategic Plan Number ID Total Base 206 Cost of Replacement or Renewal Projects Identified Priority 37 EF $ 7,32 4 38 AHU 6 $ 28,975 4 39 AHU 3 $ 28,975 4 40 AHU 4 $ 28,975 4 4 EF 3 $ 0,4 4 42 AHU $ 33,340 4 43 AHU 5 $ 28,975 4 44 Renovate EF 4 $ 0,4 4 San Ramon Center 45 TBD EF 5 $ 29,478 4 46 AHU 2 $ 28,975 4 47 CU 7 $ 6,727 47a AHU 7 $ 23,595 4 33 CH $ 43,70 4 34 CT $ 77,404 4 35 B $ 275,855 4 36 B 2 $ 275,855 4 48 Potential AC 2 $ 62,940 3 49 Advanced 2 Systems Technology Center AC $ 07,889 2 50 Project B $ 92,544 4 5 $ 60,32 52 2 $ 60,32 4 53 Demolish 4, 7, 72, 73, 3 $ 70,650 Science Center 56 2025 74, 75, 76, 78 AH $ 23,595 0 54 CH $ 30,60 0 55 B $ 44,227 0 65 Potential AC $ 65,682 4 66 Systems 97 Book Center AC 2 $ 62,940 3 67 Project B $ 44,227 4 69 HV $ 23,595 4 Renovate Women's Locker 70 47 MV 4 $ 23,595 209 Room 68 B $ 92,544 4

Job No. 246.04 Diablo Valley College HVAC Evaluation 3 NAM ID Measure E Strategic Plan 7 Potential Systems 72 Project Total Base 206 Cost of Replacement or Renewal Number ID Projects Identified Priority North Unit, North $ 64,559 60, 83 Family Life South Unit, Education North $ 70,650 South $ 92,277 4 Learning MZ 3 $ 7,089 0 59 Communities Annex 73 74 Demolish 75 MZ 2 $ 7,089 0 2026 76 MZ $ 34,78 0 57 AC $ 2,538 58 AC 2 $ 2,538 59 Potential AC 3 $ 60,32 60 AC 4 $ 82,86 90 Student Union 6 Systems AC 5 $ 60,32 62 Project AC 6 $ 70,650 63 AC 7 $ 70,650 64 B $ 36,32 4 TOTAL COSTS $ 4,430,398

32 Job No. 246.04 Diablo Valley College HVAC Evaluation SECTION 4: BUILDINGS AND HVAC EQUIPMENT The focus of this evaluation is the primary HVAC equipment serving the buildings in the scope. Table 3 shows the buildings that are included in the scope, and some of their relevant details. This report does not include a full building assessment, but the following sections provide a brief description of them as they relate to the primary HVAC equipment being evaluated. These sections describe the buildings in relation to the existing equipment, as well as any HVAC system design modifications that may be relevant to the equipment replacement projects. There is a description Section here for each building included in the evaluation scope. The first part of each section briefly describes the buildings function and operation, and the surveyed units and their condition. The next area includes any major issues with the building in bulleted lists. The last part of each individual building Section includes a list of potential replacements and improvements. Not every issue identified represents a capital project. Some issues are identified here as low cost measures. These are thought to be maintenance issues, and their cost has not been specifically analyzed under the scope of this project. However, it is estimated that each of these issues should have a cost impact on the order of $5,000 or less. The lists of potential replacements and improvements don t call out every project identified in this scope (see Section 3, Tables 3A and 3B for that information), but rather identify projects that warrant special consideration. The information in Table 3 comes from the FUSION Database used by the California Community College Chancellor s Office. Total Stations refers to permanent workspaces (desks, computer stations) in the building. HVAC Evaluation Project Priority Bldg # Name TABLE 3 BUILDINGS IN SCOPE OF THIS EVALUATION Total Overall Gross Square Footage (OGSF) Constr. Year Total Rooms Total Stations. Pilot Group 9 MUSIC 963 39 320 4,522. Pilot Group 23 PERFORMING ARTS 978 43 604 34,423. Pilot Group 58 ENGR TECHNOLOGY CNTR 97 66 52 36,55 SUBTOTALS 48,436 85,496 2. Main Group SAN RAMON CENTER 2006 79,84 60,000 2. Main Group 2 ADVANCED TECHNOLOGY CNTR 960 3 307 9,505 2. Main Group 3 HUMANITIES 964 9 62 6,428 2. Main Group 4 GYMNASIUM 955 3 8,092 2. Main Group 8 MENS LOCKER 96 8 4,889

Job No. 246.04 Diablo Valley College HVAC Evaluation 33 HVAC Evaluation Project Priority Bldg # Name Total Overall Gross Square Footage (OGSF) Constr. Year Total Rooms Total Stations 2. Main Group PHYSICAL EDUCATION 967 2 24 24,274 2. Main Group 2 LIFE & HEALTH SCIENCE 960 64 582 33,844 2. Main Group 4 SCIENCE CENTER 960 7 47 7,48 2. Main Group 47 WOMEN S LOCKER 962 9 6,850 2. Main Group 57 LIBRARY 970 7,44 63,20 2. Main Group 59 LEARNING COMMUNITIES ANNEX (Previously Counseling) 972 7,375 2. Main Group 60 FAMILY LIFE EDUC. 972 5 62 3,792 2. Main Group 6 LEARNING CENTER 993 3 553 5,94 2. Main Group 62 LIBERAL ARTS 972 32,059 24,246 2. Main Group 63 FACULTY OFFICE 972 09 236 22,36 2. Main Group 68 ADMINISTRATION BLDG 973 52 84 9,437 2. Main Group 69 PHYSICAL EDUC OFFICE 973 24 28 5,70 2. Main Group 70 ART BUILDING 975 4 330 29,400 2. Main Group 7 SCIENCE CENTER 2 976 2 42 4,84 2. Main Group 72 SCIENCE CENTER 3 976 2 60,28 2. Main Group 73 SCIENCE CENTER 4 976 2 40 846 2. Main Group 74 SCIENCE CENTER 5 976 3 30,597 2. Main Group 75 SCIENCE CENTER 6 976 25 330 2. Main Group 76 SCIENCE CENTER 7 976 389 2. Main Group 78 SCIENCE UTILITY 976 3,332 2. Main Group 83 FAMILY LIFE EDUC 980 47 4,639 2. Main Group 90 STUDENT UNION 997 7 286 2,744 2. Main Group 9 MATH BUILDING 998 5 724 24,2 2. Main Group 92 PHYSICAL SCIENCE 2000 70 736 4,220 2. Main Group 94 BUSINESS/FOREIGN LANGUAGE 2002 47 65 26,676 2. Main Group 97 BOOKSTORE 2006 7 3 3,462 SUBTOTALS 853 0,07 525,665 4. SAN RAMON CENTER (BUILDING ) 4.. EXISTING UNITS AND CONDITIONS This building is designated to be renovated under the Measure E strategic plan, however the timeline is yet to be determined. The San Ramon Center (SRC) is a two story building constructed in 2005 with two wings containing classrooms, offices, and conference rooms. Mechanical equipment is located in a mechanical room separate from the main SRC buildings and inside the penthouse attic space above the second floor in both buildings. A few smaller

34 Job No. 246.04 Diablo Valley College HVAC Evaluation pieces of equipment are located outside the building. Only a portion the original construction mechanical drawings and architectural floor plans were available at the time of this report. These drawings were found to be partially accurate with respect to existing conditions and showed some of the major HVAC equipment serving the building. The SRC contains a boiler plant and a chiller plant, as well as larger air handling units and exhaust fans located in the penthouse attic spaces. The mechanical equipment are generally in good condition, as they are located inside and there is good maintenance access to these units. Both the heating hot water and chilled water distribution systems are primary only, variable flow, with VFDs on the pumps. Six VAV air handling units (AHU /NAM ID 42, AHU 2/NAM ID 46, AHU 3/NAM ID 39, AHU 4/NAM ID 40, AHU 5/NAM ID 43, and AHU 6/NAM ID 38) are located in the penthouse attic spaces. These units serve the conference rooms, offices, classrooms, and labs. The first floor E80 IT room is also served by one additional smaller air handling unit inside the room (AHU 7/NAM ID 47A) and one exterior 0 ton condensing unit (CU 7/NAM ID 47). Four large exhaust fans inside the penthouse attic spaces (EF /NAM ID 37, EF 3/NAM ID 4, EF 4/NAM ID 44, and EF 5/NAM ID 45) serve the restrooms, science labs, and science lab fume hoods. One 300 ton centrifugal York chiller with VFDs (CH /NAM ID 33) and an Evapco cooling tower (CT /NAM ID 34) serve the SRC. There is interest in upgrading the chiller to a frictionless variable speed unit such as a Turbocor chiller. The SRC has two 2000 MBH modular forced draft Aerco Benchmark boilers (B /NAM ID 35 and B 2/NAM ID 36) that serve the air handling units and VAV reheat boxes. The bearings on boiler B 2 were being replaced at the time of the audit. The pump serving B 2 (HWP 2) appears to be original, while HWP is new. The boiler, chiller, cooling tower, exhaust fans, and handling units are connected to the BAS for scheduling and zone setpoint control. Current major issues with the building include: The EF 5, which serves the fume hoods, has a vibration issue. The source of the vibration seems to be in the discharge ductwork near the penthouse ceiling and has access issues. The boiler plant does not have a bypass line, making proper HHW reset control difficult. The compressor in the CU 7 condensing unit has some minor vibration issues and damage to the refrigerant line insulation. Other minor maintenance issues found during the evaluation are listed in the HVAC Inventory (Appendix A).

Job No. 246.04 Diablo Valley College HVAC Evaluation 35 4..2 POTENTIAL REPLACEMENTS AND IMPROVEMENTS The evaluation identified the following opportunities for equipment replacement and improvement: Current Projects Install a bypass line in the boiler plant to allow for HHW reset control (low cost measure). Fix the vibration issue in EF 5 (low cost measure). Fix the refrigerant line insulation serving the CU 7 condensing unit and resolve vibration issues (low cost measure (low cost measure). Future Projects Upgrade the chiller to a frictionless variable speed unit (e.g. Turbocor unit). The existing chiller still has approximately 9 years of EUL. (Priority 4) 4.2 ADVANCED TECHNOLOGY CENTER (BUILDING 2) 4.2. EXISTING UNITS AND CONDITIONS This building is not currently included in the Measure E strategic plan. The Advanced Technology Center (ATC) is a single story building containing classrooms and offices. Mechanical equipment inside the first floor mechanical room and on the roof of the building. The mechanical drawings from a 2003 renovation were available at the time of this report. These drawings were found to be accurate with respect to existing conditions and showed the major HVAC equipment serving the building. The ATC is served by two packaged VAV air conditioning units (AC /NAM ID 49 and AC 2/NAM ID 48) serving the classrooms, hallways, and restrooms. These units are located on the roof of the building. The units are generally in good condition, though they are approximately 3 years old. There is some damage to the units insulation, and some vibration issues were observed. One 850 MBH forced draft Bryan boiler (B /NAM ID 50) serves the VAV reheat boxes. The boiler is in good condition, and the pumps were overhauled at the end of 205. The boiler pressure was observed to be slightly high. The boiler and air conditioning units are connected to the Andover BAS for scheduling and zone setpoint control. The individual VAV boxes are fully connected to the BAS. Current major issues with the building include: The economizers in the two packaged air conditioning units appear to not be functioning, possibly due to broken damper actuators. is over pressurized, causing exterior doors to blow open. This may be due to issues with the board and drives on AC. Site staff believes that either the drives are properly controlling to the

36 Job No. 246.04 Diablo Valley College HVAC Evaluation building or duct pressure sensors, but it may be that the pressure sensors themselves are faulty. Air conditioning units condenser coils appear weathered and corroded. A squeaking noise was observed from the condensing unit on AC. Other minor maintenance issues found during the evaluation are listed in the HVAC Inventory (Appendix A). 4.2.2 POTENTIAL REPLACEMENTS AND IMPROVEMENTS The evaluation identified the following opportunities for equipment replacement and improvement: Current Projects Replace the economizer damper actuators in the two air conditioning units and recommission the economizer operation (low cost measure). Recommission the building (likely including airside test and balance) to eliminate over pressurization issues (supply/return VFD controls adjustment, VAV box damper control adjustment) (low cost measure). Future Projects The air conditioning units will soon be at the end of their EUL around 2020. At that time, replace the units with premium efficiency units. (Priority 2 3) 4.3 HUMANITIES (BUILDING 3) 4.3. EXISTING UNITS AND CONDITIONS This building is not currently included in the Measure E strategic plan. The Humanities is a single story building containing mostly classrooms. All mechanical equipment is located on the roof of the building. The original mechanical drawings from 963 as well as mechanical drawings from 987 renovations and 2002 seismic retrofits were available at the time of this report. These drawings were not accurate with respect to existing conditions and did not accurately show the major HVAC equipment serving the building. The Humanities is served by two 25 ton gas furnace packaged multizone units (RTU /NAM ID 25 and RTU 2/NAM ID 26) that serve the North and South classrooms. These units are in good condition, but the economizer controls appear to not be functioning properly. The exhaust dampers were observed to be closed during the field observation when the building should have been in full economizer mode. The Humanities is also served by two 7.5 ton gas furnace packaged CAV single zone units (AC East/NAM ID 27 and AC West/NAM ID 28) that serve the AC East and AC West rooms. These units have deformed condenser coils and outside air grilles. Standing water was observed on the outdoor air intake shield, and the flex electrical conduit is deteriorating on the AC West unit.